A multi-probe staggered infrared detection device

Abstract

The present application provides a kind of multi-probe staggered infrared detection device, the infrared detection device is based on the structure and arrangement design of at least two pyroelectric sensors, there is suitable interval between the sensitive element in the same signal channel, so that the field of view formed by the sensitive element of different pyroelectric sensors can be staggered, while weakening the signal cancellation degree between the sensitive element in the same signal channel, the projection of the field of view of the infrared detection device in unit area forms blind area, and the behavior of corresponding infrared radiator across the field of view boundary can be effectively responded by the infrared detection device based on the isolation between different pyroelectric sensors in signal channel, and then under the gap size requirement limit between the sensitive element in the same signal channel, the equivalent improvement of the field of view density of the infrared detection device is formed, and the detection sensitivity of the infrared detection device is improved to be suitable for micro-motion detection scene beyond the limit.

Description

Technical Field

[0001] This invention relates to the field of passive infrared detection, and more specifically to a multi-probe interleaved infrared detection device. Background Technology

[0002] Among existing technologies for detecting human presence, the most widely used and mature technology is the use of pyroelectric infrared (PIR) sensors to detect cross-regional movements of the human body within a detection area, based on the partitioning of a corresponding detection region using an infrared detection lens. The corresponding infrared detection device corresponds to... Figure 1 The structural principle includes an infrared detection lens 10P and a pyroelectric infrared sensor (also called a probe) 20P. The pyroelectric infrared sensor 20P is exemplified in a binary configuration. The pyroelectric sensor 20P includes a positive sensing element 21P and a negative sensing element 22P arranged side-by-side in the same signal channel. The infrared detection lens 10P is a lens array composed of multiple lens units 11P, each of which has the same light-gathering characteristics as a convex lens. The pyroelectric sensor 20P is configured with the positive sensing element 21P and the negative sensing element 22P facing the infrared detection lens 10P. The positive sensing element 21P forms a corresponding temperature-sensing space (field of view) through any of the lens units 11P and is defined as a bright area. The negative sensing element 22P forms a corresponding temperature-sensing space (field of view) through any of the lens units 11P and is defined as a dark area. The bright area formed by the pyroelectric sensor 20P through the same lens unit 11P... There is also a blind zone between the bright and dark areas. Based on the focusing principle of the convex lens and the reversibility of the optical path, the bright and dark areas correspond to the spatial ranges projected by the positive sensitive element 21P and the negative sensitive element 22P through the corresponding lens unit 11P, respectively. Infrared light emitted by the human body in the bright area can be focused by the lens unit 11P to the positive sensitive element 21P, causing the pyroelectric sensor 20P to generate a positive voltage. Infrared light emitted by the human body in the dark area can be focused by the lens unit 11P to the negative sensitive element 22P, causing the pyroelectric sensor 20P to generate a negative voltage. In this way, the pyroelectric sensor 20P can form a corresponding number of bright and dark areas and a blind zone defined between the bright and dark areas through each lens unit 11P of the infrared detection lens 10P. When the human body makes a cross-area movement between any two areas of the bright, dark, and blind areas, it forms a corresponding displacement of the infrared spot, and can detect the human body's cross-area movement based on the corresponding electrical signal change.

[0003] Based on the aforementioned working principle of the infrared detection device, it can be understood that for the bright area, dark area, and blind area formed by the pyroelectric sensor 20P through the same lens unit 11P, the projected dimensions of these areas on the corresponding detection surface (such as the ground) are proportionally related to the dimensions of the positive sensitive element 21P and the negative sensitive element 22P of the pyroelectric sensor 20P, as well as the size of the gap between the positive and negative sensitive elements 21P and 22P. These dimensions increase with the increase of the distance between the installation position of the infrared detection device and the detection surface (corresponding to the installation height in the top-mounted state). Therefore, although those skilled in the art know that the denser the projection of the field of view formed by the pyroelectric sensor 20P through each lens unit 11P onto the ground, the higher the detection sensitivity and accuracy of the infrared detection device, this known conclusion is based on the premise that the projected dimensions of the bright area, dark area, and blind area formed by the pyroelectric sensor 20P through the same lens unit 11P on the ground must meet certain size requirements. In other words, regarding the bright area, dark area, and blind area formed by the pyroelectric sensor 20P through the same lens unit 11P, the blind area must exist and project onto the ground at the same proportion as the bright and dark areas. Correspondingly, when the projection of the field of view formed by the pyroelectric sensor 20P through each lens unit 11P onto the ground is too dense, on the one hand, due to the area limitation of the infrared detection lens 10P, the size of each lens unit 11P will be too small to obtain a sufficiently strong detection signal based on the human body's movement across any two areas of the bright, dark, and blind areas; on the other hand, an overly dense field of view projection means that the projection area is also very small, so the space occupied by the human body may simultaneously be in the bright and dark areas, causing the infrared radiation from the human body to cancel out the signals generated by the interconnected positive sensitive element 21P and negative sensitive element 22P. Therefore, even if a four-element pyroelectric sensor 20P is used to increase the number of sensitive elements, the size requirement of the gap between the positive and negative sensitive elements in the same signal channel for the corresponding infrared detection device's field of view projection remains a constraint. Figure 2 The diagram shows that there are still continuous blind spots of considerable size.

[0004] In summary, in the traditional design of the infrared detection device, the projection size of the bright area, dark area, and blind area formed by the pyroelectric sensor 20P through the same lens unit 11P on the ground at the recommended installation height must meet certain size requirements, such as a width requirement of at least 20cm, and usually a width requirement of more than 30cm, to ensure the signal strength corresponding to human body movements across the area. This limits the improvement of the detection sensitivity and accuracy of the infrared detection device, resulting in the current infrared detection device having a low upper limit of sensitivity and accuracy. Therefore, it is difficult to stably detect the micro-movements of the human body, such as raising / waving hands, slight forward and backward tilting of the body, left and right swaying, and swaying of the upper and lower body. Summary of the Invention

[0005] One objective of this invention is to provide a multi-probe interleaved infrared detection device, wherein the multi-probe interleaved infrared detection device can, under the limitation of the size requirement of the gap between the sensitive elements in the same signal channel, form an equivalent increase in the field density of the multi-probe interleaved infrared detection device, thereby breaking through the limitation to improve the detection sensitivity and accuracy of the multi-probe interleaved infrared detection device to make it suitable for micro-motion detection scenarios, thus having significant technical significance and commercial value.

[0006] Another objective of this invention is to provide a multi-probe interleaved infrared detection device. This device is based on the structural design and arrangement of at least two pyroelectric sensors, maintaining a suitable interval between the fields of view formed by the sensitive elements in the same signal channel. This allows the fields of view formed by the sensitive elements of different pyroelectric sensors to be interleaved. This weakens the signal cancellation between sensitive elements in the same signal channel while ensuring signal strength. Simultaneously, the blind zone formed by the projection of the field of view per unit area of ​​the multi-probe interleaved infrared detection device can be reduced due to the interleaving of the fields of view. Furthermore, the behavior of the infrared radiator crossing the field of view boundary can be effectively responded to by the multi-probe interleaved infrared detection device based on the isolation between the different pyroelectric sensors in the signal channel. Thus, under the constraint of the size requirement of the gap between sensitive elements in the same signal channel, an equivalent increase in the field of view density of the multi-probe interleaved infrared detection device is achieved, thereby overcoming limitations and improving the detection sensitivity and accuracy of the multi-probe interleaved infrared detection device to suit micro-motion detection scenarios.

[0007] Another object of the present invention is to provide a multi-probe interleaved infrared detection device, wherein, based on the structural design and arrangement of at least two pyroelectric sensors, a suitable interval is maintained between the fields of view formed by the sensitive elements in the same signal channel, so that the fields of view formed by the sensitive elements of different pyroelectric sensors can be interleaved. The multi-probe interleaved infrared detection device is designed to include at least two pyroelectric sensors, wherein the at least two pyroelectric sensors include a first pyroelectric sensor and a second pyroelectric sensor that meet the following requirements: the sensitive elements in the first pyroelectric sensor and the second pyroelectric sensor are both set as elongated strips with an aspect ratio greater than or equal to 2; the sensitive elements of the same pyroelectric sensor in the first pyroelectric sensor and the second pyroelectric sensor are arranged side by side in the width direction and have the same length extension direction; and the length extension directions of the sensitive elements of the first pyroelectric sensor and the second pyroelectric sensor are different, so that the fields of view formed by the sensitive elements of at least two pyroelectric sensors can be interleaved.

[0008] Another objective of this invention is to provide a multi-probe interleaved infrared detection device, wherein the multi-probe interleaved infrared detection device further includes a first lens and a second lens, which are independently matched to the first pyroelectric sensor and the second pyroelectric sensor, respectively. This optimizes the isolation of the first pyroelectric sensor and the second pyroelectric sensor in the light path while ensuring the light intensity of the first pyroelectric sensor and the second pyroelectric sensor. Thus, based on the aforementioned structural features of the first pyroelectric sensor and the second pyroelectric sensor, the detection sensitivity and accuracy of the multi-probe interleaved infrared detection device are improved, while ensuring the signal strength and stability of the multi-probe interleaved infrared detection device in micro-motion detection scenarios.

[0009] Another object of the present invention is to provide a multi-probe interleaved infrared detection device, wherein the lens unit arrays of the first lens and the second lens are both arrays of multiple continuous optically oriented lenses, wherein the continuous optical center direction of each continuous optically oriented lens on the first lens matches the length extension direction of the sensing element of the first pyroelectric sensor, and the continuous optical center direction of each continuous optically oriented lens on the second lens matches the length extension direction of the sensing element of the second pyroelectric sensor. This design is based on the matching of the sensing element of the first pyroelectric sensor and the optical centers of the continuous optically oriented lenses on the first lens in the extension direction, and the second pyroelectric sensor... The matching design of the sensitive element of the pyroelectric sensor with the optical center of the continuous optical center lens on the second lens in the extension direction, and the desensitization characteristics of the field of view formed by the continuous optical center lens in the continuous direction of the optical center lens, respectively enhance the response capability of the first pyroelectric sensor and the second pyroelectric sensor to infrared radiators moving in the width direction of their respective sensitive elements. Thus, in the case where the length extension direction of the sensitive elements of the first pyroelectric sensor and the second pyroelectric sensor are different, the signal strength and stability of the multi-probe interleaved infrared detection device in micro-motion detection scenarios are further improved.

[0010] Another object of the present invention is to provide a multi-probe interleaved infrared detection device, wherein the first lens and the second lens each have a first lens area and a second lens area arranged opposite to each other, and a third lens area and a fourth lens area arranged opposite to each other between the first lens area and the second lens area. The lens unit arrays of the first lens area and the second lens area are arrays of multiple continuous optically centered lenses, and the lens unit arrays of the third lens area and the fourth lens area are arrays of multiple single-point optically centered lenses. The continuous optical center direction of each continuous optically centered lens on the first lens matches the length extension direction of the sensitive element of the first pyroelectric sensor, and the continuous optical center direction of each continuous optically centered lens on the second lens matches the length extension direction of the sensitive element of the second pyroelectric sensor. In this way, with the sensitive elements of the first and second pyroelectric sensors having different length extension directions, the field of view formed by the continuous optical center lens of the first lens and the second lens of the second pyroelectric sensor can complement each other, and the field of view formed by the single-point optical center lens of the first lens and the second lens of the second pyroelectric sensor can complement each other. This achieves the interleaving between the field of view corresponding to the continuous optical center lens and the field of view corresponding to the single-point optical center lens, thereby simultaneously improving the sensitivity, signal strength, and stability of the multi-probe interleaved infrared detection device in micro-motion detection scenarios.

[0011] Another objective of this invention is to provide a multi-probe interleaved infrared detection device, wherein the length extension directions of the sensitive elements of the first and second pyroelectric sensors are different. Preferably, the length extension direction of the sensitive element of the first pyroelectric sensor is perpendicular to the length extension direction of the sensitive element of the second pyroelectric sensor. This allows the sensitive elements in the first and second pyroelectric sensors to be configured as elongated strips with an aspect ratio greater than or equal to 2, resulting in different sensitivities in the length and width directions of the sensitive elements. Based on the design that the length extension direction of the sensitive element of the first and second pyroelectric sensors is perpendicular to the length extension direction of the sensitive element of the second pyroelectric sensor, the multi-probe interleaved infrared detection device achieves convergent sensitivity and accuracy in different radial directions, which is beneficial for further ensuring the stability of the multi-probe interleaved infrared detection device in micro-motion detection scenarios.

[0012] Another object of the present invention is to provide a multi-probe interleaved infrared detection device, wherein the multi-probe interleaved infrared detection device further includes a third pyroelectric sensor, wherein the sensitive element of the third pyroelectric sensor is also configured as a strip with an aspect ratio greater than or equal to 2, and is arranged side by side in the width direction with the same length extension direction, and the length extension direction of the sensitive elements of the first pyroelectric sensor, the second pyroelectric sensor, and the third pyroelectric sensor are different, and preferably satisfies the following condition: In one pyroelectric sensor, the length extension direction of the sensitive element is the reference direction. The length extension directions of the sensitive elements of the other two pyroelectric sensors are rotated by 60° and 120° respectively relative to the reference direction within an error range of 5°. This staggered design based on the length extension directions of the sensitive elements of multiple pyroelectric sensors improves the sensitivity and accuracy of the multi-probe staggered infrared detection device while ensuring the convergence of sensitivity and accuracy in different radial directions. This, in turn, ensures the reliability and stability of the multi-probe staggered infrared detection device in micro-motion detection scenarios.

[0013] Another object of the present invention is to provide a multi-probe interleaved infrared detection device, wherein the multi-probe interleaved infrared detection device further includes a third pyroelectric sensor and a fourth pyroelectric sensor. The sensitive elements of the third and fourth pyroelectric sensors are also configured as elongated strips with an aspect ratio greater than or equal to 2. Furthermore, the sensitive elements of the same pyroelectric sensor are arranged side-by-side in the width direction and have the same length extension direction. The length extension directions of the sensitive elements of the first, second, third, and fourth pyroelectric sensors are different, and preferably, the first, second, and fourth pyroelectric sensors are arranged in parallel in the width direction. In this device, the length extension direction of the sensitive element of one of the third and fourth pyroelectric sensors is taken as the reference direction. The length extension directions of the sensitive elements of the other three pyroelectric sensors are rotated by 45°, 90°, and 135° respectively relative to the reference direction within an error range of 5°. This staggered design based on the length extension directions of the sensitive elements of multiple pyroelectric sensors improves the sensitivity and accuracy of the multi-probe staggered infrared detection device while ensuring the convergence of sensitivity and accuracy in different radial directions. This, in turn, ensures the reliability and stability of the multi-probe staggered infrared detection device in micro-motion detection scenarios.

[0014] Another objective of this invention is to provide a multi-probe interleaved infrared detection device, wherein, with the length extension direction of the sensitive element of the first pyroelectric sensor as a reference direction, the length extension directions of the sensitive elements of the second, third, and fourth pyroelectric sensors are rotated in the same direction by 45°, 90°, and 135° respectively relative to the reference direction within an error range of 5°, and satisfying that the positions of the first, second, third, and fourth pyroelectric sensors are arranged sequentially around the same direction of rotation, then the position of the first pyroelectric sensor is opposite to the position of the third pyroelectric sensor, and the length extension direction of the sensitive element of the first pyroelectric sensor tends to be perpendicular to the length extension direction of the sensitive element of the third pyroelectric sensor, the position of the second pyroelectric sensor is opposite to the position of the fourth pyroelectric sensor, and the... The length extension direction of the sensitive element of the second pyroelectric sensor tends to be perpendicular to the length extension direction of the sensitive element of the fourth pyroelectric sensor. This allows the multi-probe interleaved infrared detection device to achieve vertical interleaving between the field of view formed by the first pyroelectric sensor through the first lens and the field of view formed by the third pyroelectric sensor through the third lens, and between the field of view formed by the second pyroelectric sensor through the second lens and the field of view formed by the fourth pyroelectric sensor through the fourth lens. At the same time, it achieves complementarity between the two interleaved fields of view, thereby simultaneously improving the sensitivity, signal strength, and stability of the multi-probe interleaved infrared detection device in micro-motion detection scenarios.

[0015] Another object of the present invention is to provide a multi-probe interleaved infrared detection device, wherein on the pyroelectric sensor, sensitive elements located in the same signal channel are grouped into a group of sensitive elements. The first pyroelectric sensor and the second pyroelectric sensor are arranged in a configuration having at least two signal channels. The sensitive elements in both the first and second pyroelectric sensors are arranged in a strip shape with an aspect ratio greater than or equal to 2. Furthermore, the sensitive elements of the same pyroelectric sensor in both the first and second pyroelectric sensors are arranged side-by-side in the width direction and have the same length extension direction. The arrangement of the sensitive elements on the same pyroelectric sensor in both the first and second pyroelectric sensors further satisfies the condition that adjacent sensitive elements are located in different signal channels and have a gap width of less than or equal to 0.8 mm in the width direction. That is, adjacent sensitive elements in the same signal channel are separated by at least one sensitive element in another signal channel, thus satisfying the requirement that... While limiting the size of the gap between sensitive elements in the same signal channel, this allows for narrowing the gap between adjacent sensitive elements on the same pyroelectric sensor in both the first and second pyroelectric sensors. Correspondingly, under the same area constraint, this facilitates increasing the signal strength of the multi-probe interleaved infrared detection device in the corresponding detection scenario by increasing the size of the sensitive elements on the pyroelectric sensor. Furthermore, when the fields of view formed by the sensitive elements of the first and second pyroelectric sensors intersect each other based on the interlacing of the sensitive element length extension directions, the blind zone formed by the projection of the field of view of the multi-probe interleaved infrared detection device per unit area is reduced to a near-blind zone state. Thus, under the size limitation of the gap between sensitive elements in the same signal channel, an equivalent increase in the field of view density of the multi-probe interleaved infrared detection device is achieved, thereby overcoming the limitations and improving the detection sensitivity and accuracy of the multi-probe interleaved infrared detection device to suit micro-motion detection scenarios.

[0016] Another objective of this invention is to provide a multi-probe interleaved infrared detection device, wherein the first pyroelectric sensor and the second pyroelectric sensor are configured with at least two signal channels. When the fields of view formed by the sensitive elements of the first and second pyroelectric sensors are interleaved based on the length extension direction of the sensitive elements, the combined analysis of signals from different signal channels of the different pyroelectric sensors allows for the effective differentiation of motion interference or environmental interference, unlike human micro-movements and movement. This improves the anti-interference capability of the multi-probe interleaved infrared detection device by combining and analyzing signals from different signal channels of the different pyroelectric sensors, thereby ensuring the device's high sensitivity and high accuracy, and guaranteeing its reliability and stability in micro-movement detection scenarios.

[0017] Another object of the present invention is to provide a multi-probe interleaved infrared detection device, wherein the first pyroelectric sensor and the second pyroelectric sensor are both configured in a quaternary form with dual channels, comprising four sensing elements. The sensing elements corresponding to the same pyroelectric sensor are arranged in a strip shape with an aspect ratio greater than or equal to 2 and are arranged side-by-side in the width direction. The four sensing elements are named as the first sensing element, the second sensing element, the third sensing element, and the fourth sensing element according to their side-by-side arrangement in the width direction. The first and third sensing elements are located in the same signal channel, while the second and fourth sensing elements are located in another signal channel, thus satisfying the size requirement of the gap between sensing elements in the same signal channel. Simultaneously, the gap width between adjacent sensitive elements on the same pyroelectric sensor in the width direction can be reduced to less than or equal to 0.8 mm, which is beneficial for reducing the blind zone. When the fields of view formed by the sensitive elements of the first and second pyroelectric sensors intersect each other based on the interlacing of the length extension direction of the sensitive elements, the blind zone formed by the projection of the field of view of the multi-probe interlaced infrared detection device per unit area is further reduced to a state close to no blind zone. In this way, under the size requirement of the gap between sensitive elements in the same signal channel, an equivalent increase in the field of view density of the multi-probe interlaced infrared detection device is formed, thereby breaking through the limitation and improving the detection sensitivity and accuracy of the multi-probe interlaced infrared detection device to be suitable for micro-motion detection scenarios.

[0018] To achieve at least one of the above objectives, the present invention provides a multi-probe interleaved infrared detection device, the multi-probe interleaved infrared detection device comprising:

[0019] At least two pyroelectric sensors, comprising a first pyroelectric sensor and a second pyroelectric sensor, each having at least two sets of sensitive elements. Each set of sensitive elements has an even multiple of the number of sensitive elements and is located in the same signal channel. Both the first and second pyroelectric sensors are configured with at least two signal channels. The sensitive elements in both the first and second pyroelectric sensors are elongated strips with an aspect ratio greater than or equal to 2. The sensitive elements of the first pyroelectric sensor are arranged side-by-side in the width direction with the same length extension direction, as are the sensitive elements of the second pyroelectric sensor. Adjacent sensitive elements on the same pyroelectric sensor in both the first and second pyroelectric sensors are located in different signal channels and have a gap width of less than or equal to 0.8 mm in the width direction. Furthermore, the first and second pyroelectric sensors have different sensitive element length extension directions.

[0020] The first lens and the second lens are independently matched to the first pyroelectric sensor and the second pyroelectric sensor, respectively.

[0021] In one embodiment, both the first and second pyroelectric sensors are configured in a quaternary configuration with dual channels, comprising four sensing elements. The sensing elements corresponding to the same pyroelectric sensor are arranged in a strip shape with an aspect ratio greater than or equal to 2 and are arranged side by side in the width direction. The four sensing elements are named as the first sensing element, the second sensing element, the third sensing element, and the fourth sensing element according to their side-by-side arrangement in the width direction. The first and third sensing elements are located in the same signal channel, while the second and fourth sensing elements are located in another signal channel.

[0022] In one embodiment, the lens unit array of the first lens and the second lens is an array arrangement of multiple single-point optically centered lenses.

[0023] In one embodiment, the lens unit array of the first lens and the second lens is an array arrangement of multiple lens units configured in the form of Fresnel lenses.

[0024] In one embodiment, the lens unit array of the first lens and the second lens is an array arrangement of multiple lens units arranged in a bean-like shape with a thick center and thin edges.

[0025] In one embodiment, the lens unit arrays of the first lens and the second lens are both arrays of multiple continuous optical center lenses, wherein the continuous optical center direction of each continuous optical center lens on the first lens matches the length extension direction of the sensitive element of the first pyroelectric sensor, and the continuous optical center direction of each continuous optical center lens on the second lens matches the length extension direction of the sensitive element of the second pyroelectric sensor.

[0026] In one embodiment, both the first lens and the second lens have a first lens region and a second lens region arranged opposite to each other, and a third lens region and a fourth lens region arranged opposite to each other between the first lens region and the second lens region. The lens unit arrays of the first lens region and the second lens region are arrays of multiple continuous optically centered lenses, and the lens unit arrays of the third lens region and the fourth lens region are arrays of multiple single-point optically centered lenses. The continuous optical center direction of each continuous optically centered lens on the first lens matches the length extension direction of the sensitive element of the first pyroelectric sensor, and the continuous optical center direction of each continuous optically centered lens on the second lens matches the length extension direction of the sensitive element of the second pyroelectric sensor.

[0027] In one embodiment, the first lens and the second lens have the same lens unit array design.

[0028] In one embodiment, the first lens and the second lens are integrally connected as a single lens having two protrusions.

[0029] In one embodiment, the lens unit arrays of the first lens and the second lens are arranged in a square pyramid shape.

[0030] In one embodiment, the lens unit array of the first lens and the second lens is arranged in a square pyramid shape with the top flattened.

[0031] In one embodiment, the length extension direction of the sensitive element of the first pyroelectric sensor tends to be perpendicular to the length extension direction of the sensitive element of the second pyroelectric sensor within an error range of 5°.

[0032] In one embodiment, the multi-probe interleaved infrared detection device further includes a third pyroelectric sensor and a third lens independently matched to the third pyroelectric sensor. The sensitive element in the third pyroelectric sensor is also set as a strip shape with an aspect ratio greater than or equal to 2, and is arranged side by side in the width direction with the same length extension direction. The length extension direction of the sensitive elements of the first pyroelectric sensor, the second pyroelectric sensor, and the third pyroelectric sensor are different.

[0033] In one embodiment, the length extension direction of the sensitive element of one of the pyroelectric sensors (the first, second, and third pyroelectric sensors) is used as a reference direction, and the length extension directions of the sensitive elements of the other two pyroelectric sensors are rotated in the same direction by 60° and 120° respectively, within an error range of 5° relative to the reference direction.

[0034] In one embodiment, the multi-probe interleaved infrared detection device further includes a third pyroelectric sensor and a fourth pyroelectric sensor, as well as a third lens and a fourth lens independently matched to the third pyroelectric sensor and the fourth pyroelectric sensor, respectively. The sensitive elements in the third pyroelectric sensor and the fourth pyroelectric sensor are also configured as elongated strips with an aspect ratio greater than or equal to 2, and the sensitive elements of the same pyroelectric sensor are arranged side by side in the width direction and have the same length extension direction. The length extension directions of the sensitive elements of the different pyroelectric sensors in the first pyroelectric sensor, the second pyroelectric sensor, the third pyroelectric sensor, and the fourth pyroelectric sensor are different.

[0035] In one embodiment, the length extension direction of the sensitive element of one of the pyroelectric sensors (first, second, third, and fourth) is taken as the reference direction, and the length extension directions of the sensitive elements of the other three pyroelectric sensors are rotated in the same direction by 45°, 90°, and 135° respectively, within an error range of 5° relative to the reference direction.

[0036] In one embodiment, the first pyroelectric sensor, the second pyroelectric sensor, the third pyroelectric sensor, and the fourth pyroelectric sensor are arranged sequentially around the same rotation direction. The positions of the first pyroelectric sensor and the third pyroelectric sensor are opposite each other, and the length extension direction of the sensitive element of the first pyroelectric sensor tends to be perpendicular to the length extension direction of the sensitive element of the third pyroelectric sensor. Similarly, the positions of the second pyroelectric sensor and the fourth pyroelectric sensor are opposite each other, and the length extension direction of the sensitive element of the second pyroelectric sensor tends to be perpendicular to the length extension direction of the sensitive element of the fourth pyroelectric sensor.

[0037] In one embodiment, the lens unit array of the first lens is divided into a first array and a second array arranged opposite to each other, and a third array and a fourth array arranged opposite to each other between the first array and the second array. The optical center design of the lens units in the first array and the second array satisfies the requirement of having a relatively sparse optical center distribution density near the edges of the third array and the fourth array, while deviating from the first array and the second array. The optical center design of the lens units in the third array and the fourth array satisfies the requirement of having a relatively sparse optical center distribution density near the edges of the first array and the second array, while deviating from the first array and the second array. The second lens, the third lens, and the fourth lens have the same lens unit array design as the first lens, and are rotated in the same direction by 45°, 90°, and 135° respectively relative to the first lens within an error range of 5°.

[0038] The further objects and advantages of the invention will become fully apparent from the following description and accompanying drawings. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structural principle of an existing infrared detection device.

[0040] Figure 2 This is a typical projection distribution of the field of view on the ground formed by an existing infrared detection device using a quaternary pyroelectric sensor.

[0041] Figure 3A This is a schematic diagram of the overall structure of a multi-probe interleaved infrared detection device according to an embodiment of the present invention.

[0042] Figure 3B This is a schematic diagram illustrating the structural principle of the multi-probe interleaved infrared detection device according to the above embodiments of the present invention.

[0043] Figure 3C This is a schematic diagram of the sensitive element distribution structure of one of the pyroelectric sensors in the multi-probe interleaved infrared detection device according to the above embodiments of the present invention.

[0044] Figure 4A This diagram illustrates the connection relationship between a group of sensitive elements connected in series with opposite polarities in a signal channel.

[0045] Figure 4B This diagram illustrates the connection relationship between a group of sensitive elements connected in parallel with opposite polarities in a signal channel.

[0046] Figure 4C The diagram shows a partial circuit structure of the multi-probe interleaved infrared detection device according to the above embodiments of the present invention.

[0047] Figure 5A This is a schematic diagram of the theoretical staggered distribution of the field of view of the multi-probe staggered infrared detection device according to the above embodiments of the present invention projected onto the ground.

[0048] Figure 5B This is a schematic diagram of the simulated distribution of the field of view of the multi-probe interlaced infrared detection device according to the above embodiments of the present invention projected onto the ground.

[0049] Figure 6A This is a schematic diagram of the lens structure of a multi-probe interleaved infrared detection device according to another embodiment of the present invention.

[0050] Figure 6B This is a schematic diagram of the simulated distribution of the field of view of the multi-probe interlaced infrared detection device according to the above embodiments of the present invention projected onto the ground.

[0051] Figure 7A This is a schematic diagram illustrating the structural principle of a multi-probe interleaved infrared detection device according to another embodiment of the present invention.

[0052] Figure 7B This is a schematic diagram of the lens structure of the multi-probe interleaved infrared detection device according to the above embodiments of the present invention.

[0053] Figure 7C This is a schematic diagram of the simulated distribution of the field of view of the multi-probe interlaced infrared detection device according to the above embodiments of the present invention projected onto the ground.

[0054] Figure 8 This is a schematic diagram illustrating the structural principle of a lens in a multi-probe interleaved infrared detection device according to another embodiment of the present invention.

[0055] Figure 9 This is a schematic diagram of the overall structure of a multi-probe interleaved infrared detection device according to another embodiment of the present invention.

[0056] Figure 10A This is a schematic diagram of the overall structure of a multi-probe interleaved infrared detection device according to another embodiment of the present invention.

[0057] Figure 10B This is a schematic diagram illustrating the field-of-view distribution principle of the multi-probe interleaved infrared detection device according to the above embodiments of the present invention. Detailed Implementation

[0058] The following description is intended to disclose the present invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0059] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention.

[0060] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0061] This invention provides a multi-probe interleaved infrared detection device, wherein the multi-probe interleaved infrared detection device can effectively improve the field of view density of the multi-probe interleaved infrared detection device under the size requirement of the gap between the sensitive elements in the same signal channel, thereby breaking through the limitation and improving the detection sensitivity and accuracy of the multi-probe interleaved infrared detection device to be suitable for micro-motion detection scenarios, thus having significant technical significance and commercial value.

[0062] Specifically, the multi-probe interleaved infrared detection device is based on the structural design and arrangement of at least two pyroelectric sensors. It maintains a suitable interval between the fields of view formed by the sensitive elements in the same signal channel, allowing the fields of view formed by the sensitive elements of different pyroelectric sensors to interleave. This weakens the signal cancellation between sensitive elements in the same signal channel while ensuring signal strength. Simultaneously, the blind zone formed by the projection of the field of view per unit area of ​​the multi-probe interleaved infrared detection device can be reduced due to the interleaving of the fields of view. Furthermore, the behavior of the infrared radiator crossing the field of view boundary can be effectively responded to by the multi-probe interleaved infrared detection device based on the isolation between different pyroelectric sensors in the signal channel. Thus, under the constraint of the size requirement of the gap between sensitive elements in the same signal channel, an equivalent increase in the field of view density of the multi-probe interleaved infrared detection device is achieved, thereby overcoming the limitations and improving the detection sensitivity and accuracy of the multi-probe interleaved infrared detection device to suit micro-motion detection scenarios.

[0063] Example, referring to the accompanying drawings of the specification of the present invention. Figures 3A to 3C As shown, the structural principle of a multi-probe interleaved infrared detection device according to an embodiment of the present invention is illustrated. The multi-probe interleaved infrared detection device includes at least two pyroelectric sensors 10, wherein the at least two pyroelectric sensors 10 include a first pyroelectric sensor 10A and a second pyroelectric sensor 10B that meet the following requirements: the first pyroelectric sensor 10A and the second pyroelectric sensor 10B each have at least two sets of sensing elements 101, each set of sensing elements 101 has an even multiple of the number of sensing elements 101 and is located in the same signal channel; that is, the first pyroelectric sensor 10A and the second pyroelectric sensor 10B are both arranged in a configuration with at least two signal channels; and the sensing elements 101 in the first pyroelectric sensor 10A and the second pyroelectric sensor 10B are all configured with a large aspect ratio. The first pyroelectric sensor 10A and the second pyroelectric sensor 10B are arranged side by side in the width direction with the same length extension direction. The sensitive elements 101 of the first pyroelectric sensor 10A and the second pyroelectric sensor 10B are also arranged side by side in the width direction with the same length extension direction. The arrangement of sensitive elements on the same pyroelectric sensor 10 in the first pyroelectric sensor 10A and the second pyroelectric sensor 10B also satisfies that adjacent sensitive elements 101 are sensitive elements 101 in different signal channels (i.e., adjacent sensitive elements 101 in the same signal channel are separated by at least one sensitive element 101 in another signal channel), and have a gap width of less than or equal to 0.8 mm in the width direction. The first pyroelectric sensor 10A and the second pyroelectric sensor 10B have different length extension directions of sensitive elements 101.

[0064] This satisfies the size requirement of the gap between the sensitive elements 101 in the same signal channel, while allowing the gap between adjacent sensitive elements 101 on the same pyroelectric sensor 10 in the first pyroelectric sensor 10A and the second pyroelectric sensor 10B to be narrowed. Correspondingly, under the same area constraint, this facilitates increasing the size of the sensitive elements 101 on the pyroelectric sensor 10 to improve the signal strength of the multi-probe interleaved infrared detection device in the corresponding detection scenario. Furthermore, when the field of view formed by the sensitive elements 101 of the first pyroelectric sensor 10A and the second pyroelectric sensor 10B is based on the sensitive element 101... When the length extension directions are interwoven, the blind zone formed by the projection of the field of view of the multi-probe interwoven infrared detection device per unit area can be reduced to a state close to no blind zone. Moreover, the behavior of the corresponding infrared radiator crossing the boundary of the field of view can be effectively responded to by the multi-probe interwoven infrared detection device based on the isolation of different signal channels. Thus, under the size requirement of the gap between the sensitive elements 101 in the same signal channel, an equivalent increase in the field of view density of the multi-probe interwoven infrared detection device is formed, thereby breaking through the limitation and improving the detection sensitivity and accuracy of the multi-probe interwoven infrared detection device to be suitable for micro-motion detection scenarios.

[0065] It is understood that, in the above description of the present invention, the connection methods between the sensitive elements 101 in the same signal channel respectively correspond to Figure 4A and Figure 4B The connection method shown in the figure corresponds to Figure 4A As shown, in a signal channel formed by a group of sensitive elements 101 connected in reverse polarity series, each sensitive element 101 is connected in series with the same polarity, and the poles connected between any two connected sensitive elements 101 are either positive or negative. Corresponding to Figure 4B As shown, in a signal channel formed by a group of sensing elements 101 connected in a parallel configuration with opposite polarities, each sensing element 101 is connected in parallel between two parallel terminals, and the number of positive terminals of sensing elements 101 connected to the same parallel terminal is the same as the number of negative terminals. This ensures that the electrical signals generated by the sensing elements 101 in the same channel due to changes in the overall ambient temperature can cancel each other out, and the response is limited to local temperature changes related to human movement or micro-motions.

[0066] Therefore, based on the above-mentioned connection relationship between the sensing elements 101 in the same signal channel, when the pyroelectric sensor 10 is set up in a state with at least two signal channels, each signal channel forms a signal output loop between the connection point of the common reference ground and the input of the subsequent signal processing. Correspondingly, in the actual pyroelectric sensor 10, when the positive and negative poles of each sensing element 101 are not marked and / or it is difficult to determine the positive and negative poles, the sensing elements 101 in the same signal channel should be defined as the sensing elements 101 connected between the reference ground and the connection point of the same input of the subsequent signal processing.

[0067] It is also understood that the sensing elements 101 in the first pyroelectric sensor 10A and the second pyroelectric sensor 10B are both set to a strip shape with an aspect ratio greater than or equal to 2. The shape of the strip-shaped sensing element 101 includes, but is not limited to, regular shapes such as rectangles, ellipses, and shapes with chamfered corners relative to rectangles. For example, the shape of the strip-shaped sensing element 101 can also be set to an irregular shape. When the aspect ratio of the sensing element is determined based on the length and width of the sensing element 101, the definition of the length and width of the regular shape of the sensing element 101 should follow the traditional understanding of the length and width of these regular shapes. When the length and width of the regular or irregular shape of the sensing element 101 cannot be clearly defined based on the traditional understanding of the length and width, the distance between the two points with the longest distance on the sensing element 101 should be taken as the length of the sensing element 101, and then the maximum dimension perpendicular to the length direction should be taken as the width of the sensing element 101.

[0068] It is worth mentioning that the arrangement of sensitive elements on the same pyroelectric sensor 10 in the first pyroelectric sensor 10A and the second pyroelectric sensor 10B satisfies that adjacent sensitive elements 101 in the same signal channel are separated by at least one sensitive element 101 in other signal channels, and the gap width between adjacent sensitive elements 101 in the width direction is less than or equal to 0.8 mm. Therefore, under the volume constraint of the pyroelectric sensor 10, the size of the sensitive elements 101 of the first pyroelectric sensor 10A and the second pyroelectric sensor 10B can be increased based on the reduction of the gap between the sensitive elements 101, which is beneficial to improving the signal strength and stability of the multi-probe interleaved infrared detection device in micro-motion detection scenarios.

[0069] Specifically, in this embodiment of the invention, the first pyroelectric sensor 10A and the second pyroelectric sensor 10B are configured with at least two signal channels. Corresponding to the situation where the fields of view formed by the sensitive elements 101 of the first pyroelectric sensor 10A and the second pyroelectric sensor 10B are intertwined based on the interlacing of the length extension direction of the sensitive elements 101, the analysis is based on the combined analysis of the signals from different signal channels of the different pyroelectric sensors 10. For example, by determining whether it is triggered by a single-channel signal or a multi-channel signal, in the case of single-channel triggering, the approximate location of the detected target is confirmed according to the trigger channel number, and in the case of multi-channel signal triggering: 1) summing and subtracting the signals from multiple channels to improve the signal-to-noise ratio of target detection; 2) judging the target motion type based on the comparison of the signals from multiple channels in terms of phase and / or amplitude; 3) multi-channel time series analysis (polarity changes, periodic differences, and time series analysis after summation and subtraction of signals from different signal channels, etc.) to extract the temporal differences between moving targets and interference. The above-described processing method enhances the detection capability of the multi-probe interleaved infrared detection device while simultaneously mitigating interference, such as interference caused by wind or the alternation of hot and cold air due to opening and closing doors and windows. This allows for the effective differentiation of motion interference or environmental interference that differs from human micro-movements and movement. Consequently, it facilitates the improvement of the detection accuracy and anti-interference capability of the multi-probe interleaved infrared detection device based on the combined analysis of signals from different signal channels of the pyroelectric sensors 10. This results in the multi-probe interleaved infrared detection device exhibiting high sensitivity and high accuracy, ensuring its reliability and stability in micro-movement detection scenarios.

[0070] In other words, in the multi-probe interleaved infrared detection device of the present invention, the first pyroelectric sensor 10A and the second pyroelectric sensor 10B are both arranged in a configuration with at least two signal channels. Each group of sensitive elements 101 has an even multiple of the number of sensitive elements 101 and is in the same signal channel. The first pyroelectric sensor 10A and the second pyroelectric sensor 10B can be arranged in a dual-channel quaternary configuration, a dual-channel octet configuration, or a three-channel hexaton configuration. Furthermore, the arrangement of sensitive elements on the same pyroelectric sensor 10 in the first pyroelectric sensor 10A and the second pyroelectric sensor 10B satisfies the following: adjacent sensitive elements 101 in the same signal channel are separated by at least one sensitive element 101 in another signal channel, and the gap width between adjacent sensitive elements 101 in the width direction is less than or equal to 0.8 mm.

[0071] For example, in this embodiment of the invention, both the first pyroelectric sensor 10A and the second pyroelectric sensor 10B are configured in a quaternary form with dual channels, comprising four sensing elements 101. The sensing elements corresponding to the same pyroelectric sensor 10 are arranged in a strip shape with an aspect ratio greater than or equal to 2 and are arranged side-by-side in the width direction. The four sensing elements 101 are named first sensing element 101A, second sensing element 101B, third sensing element 101C, and fourth sensing element 101D according to their side-by-side arrangement in the width direction. The first sensing element 101A and the third sensing element 101C are located in the same signal channel, while the second sensing element 101B and the fourth sensing element 101D are located in another signal channel. This satisfies the size requirement of the gap between the sensing elements 101 in the same signal channel. Since adjacent sensitive elements 101 are located in different signal channels, the gap width between adjacent sensitive elements 101 on the same pyroelectric sensor in the width direction can be reduced to less than or equal to 0.8 mm, which is beneficial to reducing the blind zone. When the fields of view formed by the sensitive elements of the first pyroelectric sensor 10A and the second pyroelectric sensor 10B are intertwined based on the interlacing of the length extension direction of the sensitive elements 101, the blind zone formed by the projection of the field of view of the multi-probe interlaced infrared detection device per unit area is further reduced to a state close to no blind zone. Thus, under the size requirement of the gap between the sensitive elements 101 in the same signal channel, an equivalent increase in the field of view density of the multi-probe interlaced infrared detection device is formed, thereby breaking through the limitation and improving the detection sensitivity and accuracy of the multi-probe interlaced infrared detection device to be suitable for micro-motion detection scenarios.

[0072] Preferably, in this embodiment of the invention, the multi-probe interleaved infrared detection device is configured such that both the first pyroelectric sensor 10A and the second pyroelectric sensor 10B are arranged with at least two signal channels, as shown below. Figure 4C The programmable gain amplifier shown is based on a multiplexer (MUX) with multiple selection inputs and an instrumentation amplifier architecture to amplify the signals output by the first pyroelectric sensor 10A and the second pyroelectric sensor 10B. This simplifies the circuit architecture for combining and analyzing signals from different signal channels of the different pyroelectric sensors 10 and avoids the problem of excessive power consumption caused by using multiple amplification.

[0073] Furthermore, in this embodiment of the invention, the multi-probe interleaved infrared detection device further includes a first lens 20A and a second lens 20B, which are independently matched to the first pyroelectric sensor 10A and the second pyroelectric sensor 10B, respectively. This optimizes the isolation of the first pyroelectric sensor 10A and the second pyroelectric sensor 10B along the light path while ensuring the light intensity of the first pyroelectric sensor 10A and the second pyroelectric sensor 10B. Based on the aforementioned structural features of the first pyroelectric sensor 10A and the second pyroelectric sensor 10B, the following can be achieved: Figure 5A The diagram illustrates the staggered distribution of the field of view of the multi-probe staggered infrared detection device projected onto the ground, thereby improving the detection sensitivity and accuracy of the multi-probe staggered infrared detection device, while simultaneously ensuring the signal strength and stability of the multi-probe staggered infrared detection device in micro-motion detection scenarios.

[0074] It is understandable that, unlike existing designs where multiple pyroelectric sensors share a single lens unit within a convex-hull lens, or where different pyroelectric sensors are matched in sections within a single convex-hull lens, the fields of view formed by the first pyroelectric sensor 10A and the second pyroelectric sensor 10B, based on sharing a single lens unit within a convex-hull lens or matching different sections within a single convex-hull lens, cannot be interleaved based on the lens's structural design. Therefore, in the multi-probe interleaved infrared detection device of this invention, to achieve the interleaving of the fields of view formed by the sensitive elements 101 of the first pyroelectric sensor 10A and the second pyroelectric sensor 10B, the first lens 20A and the second lens 20B cannot be designed as a single convex-hull lens integrally.

[0075] For example, in some embodiments of the present invention, the first lens 20A and the second lens 20B are integrally connected as a single lens having two protrusions.

[0076] Preferably, the first lens 20A and the second lens 20B have the same lens unit array design. This simplifies the lens design of the multi-probe staggered infrared detection device while allowing for a certain range of installation heights, and enables the staggered distribution of the field of view formed by the first pyroelectric sensor 10A through each lens unit in the first lens 20A and the field of view formed by the second pyroelectric sensor 10B through the corresponding lens unit in the second lens 20B.

[0077] Specifically, in this embodiment of the invention, the lens unit arrays of the first lens 20A and the second lens 20B are arranged in an array of multiple lens units configured in the form of Fresnel lenses. The simulation effect of the projection formed by the staggered distribution of the field of view formed by the first pyroelectric sensor 10A through each lens unit in the first lens 20A and the field of view formed by the second pyroelectric sensor 10B through each lens unit in the second lens 20B is as follows: Figure 5B As shown Figure 5A The theoretical effect shown is a perfect match.

[0078] It is worth mentioning that when the first lens 20A and the second lens 20B have the same lens unit array design, and when the lens unit arrays of the first lens 20A and the second lens 20B are arranged as an array of multiple single-point optical center lenses, the orientational relationship between the lens unit arrays of the first lens 20A and the lens unit arrays of the second lens 20B only needs to correspond to translation or translation plus rotation between them. This can achieve the staggered distribution between the field of view formed by the first pyroelectric sensor 10A through each lens unit in the first lens 20A and the field of view formed by the second pyroelectric sensor 10B through the corresponding lens unit in the second lens 20B, while taking into account a certain range of installation heights.

[0079] In other words, when the first lens 20A and the second lens 20B have the same lens unit array design, and when the lens unit arrays of the first lens 20A and the second lens 20B are arranged as an array of multiple single-point optical center lenses, the orientation of the lens unit array of the second lens 20B relative to the lens unit array of the first lens 20A only needs to correspond to the lens unit array formed by translating or translating and rotating the lens unit array of the first lens 20A. This allows for the staggered distribution of the field of view formed by the first pyroelectric sensor 10A through each lens unit in the first lens 20A and the field of view formed by the second pyroelectric sensor 10B through the corresponding lens unit in the second lens 20B, while taking into account a certain range of installation heights.

[0080] To further disclose the present invention, in another embodiment of the present invention, the lens unit arrays of the first lens 20A and the second lens 20B are as follows: Figure 6A The diagram shows an array of lens units arranged in a bean-like shape, thicker in the middle and thinner at the edges. The simulation effect of the projection formed by the interleaved distribution of the field of view formed by the first pyroelectric sensor 10A through the lens units of the first lens 20A and the field of view formed by the second pyroelectric sensor 10B through the lens units of the second lens 20B is shown below. Figure 6B The same as shown Figure 5A The theoretical effect shown is a perfect match.

[0081] In particular, such as Figures 7A to 7C As shown, based on different structural designs of the lens unit arrays of the first lens 20A and the second lens 20B, the lens structure of the multi-probe interlaced infrared detection device according to another embodiment of the present invention and the corresponding field-of-view projection simulation effect diagram are illustrated. The lens unit arrays of the first lens 20A and the second lens 20B are both arrays of multiple continuous optically oriented lenses. The continuous optical center direction of each continuous optically oriented lens on the first lens 20A matches the length extension direction of the sensing element 101 of the first pyroelectric sensor 10A. The continuous optical center direction of each continuous optically oriented lens on the second lens 20B matches the length extension direction of the sensing element 101 of the second pyroelectric sensor 10B. Thus, based on the optical centers of the sensing element 101 of the first pyroelectric sensor 10A and the continuous optically oriented lenses on the first lens 20A in the extension direction... The matching design, and the matching design of the sensitive element 101 of the second pyroelectric sensor 10B with the optical center of the continuous optical center lens on the second lens 20B in the extension direction, and the desensitization characteristics of the field of view formed by the continuous optical center lens in the continuous direction of the optical center lens, respectively enhance the response capability of the first pyroelectric sensor 10A and the second pyroelectric sensor 10B to infrared radiators moving in the width direction of their respective sensitive elements 101. Furthermore, in the state where the length extension directions of the sensitive elements 101 of the first pyroelectric sensor 10A and the second pyroelectric sensor 10B are different, the field of view formed by the first pyroelectric sensor 10A through each lens unit of the first lens 20A can be staggered with the field of view formed by the second pyroelectric sensor 10B through each lens unit of the second lens 20B. Figure 7C The intended projection simulation effect is shown, thereby improving the detection sensitivity and accuracy of the multi-probe interleaved infrared detection device, while ensuring the signal strength and stability of the multi-probe interleaved infrared detection device in micro-motion detection scenarios.

[0082] Specifically, in this embodiment of the invention, the continuous optical center lens is a lens unit whose optically equivalent focusing characteristics are formed by cutting a section perpendicular to its optical center along the principal optical axis of a conventional convex lens with a single-point optical center. Correspondingly, in the multi-probe interleaved infrared detection device, the field of view formed by the sensitive element 101 of the pyroelectric sensor 10 through the continuous optical center lens has continuity in the projection line direction of the continuous optical center, thus appearing as a continuous bright or dark area, and is located within this field of view. The infrared radiator, after passing through the corresponding continuous optical center lens, forms a linear infrared spot on the sensitive element 101 of the pyroelectric sensor 10. Therefore, the movement of the infrared radiator along the continuous direction of the field of view within the field of view cannot form the translation of the linear infrared spot between the sensitive elements 101 of the pyroelectric sensor 10, and thus cannot be effectively sensed. Correspondingly, the field of view of the multi-probe interlaced infrared detection device does not respond to the infrared radiator moving along the projection line direction of the continuous optical center, and exhibits a desensitization characteristic with the continuous direction of the optical center as the desensitization direction.

[0083] In the description of this invention, the understanding that "the continuous optical center direction of each continuous optical center lens on the first lens 20A matches the length extension direction of the sensing element 101 of the first pyroelectric sensor 10A, and the continuous optical center direction of each continuous optical center lens on the second lens 20B matches the length extension direction of the sensing element 101 of the second pyroelectric sensor 10B" should be understood in terms of optical effect as follows: each continuous optical center lens on the first lens 20A can converge light in a linear spot shape extending in the length extension direction of each sensing element 101 of the first pyroelectric sensor 10A to the corresponding sensing element 101 of the first pyroelectric sensor 10A, and each continuous optical center lens on the second lens 20B can converge light in a linear spot shape extending in the length extension direction of each sensing element 101 of the second pyroelectric sensor 10B to the corresponding sensing element 101 of the second pyroelectric sensor 10B.

[0084] It is worth mentioning that, in the description of this invention, the understanding of a single-point optical center lens corresponds to a lens unit having a single-point optical center design and having the same light-gathering characteristics as a convex lens, such as the lens unit provided in the form of a Fresnel lens, or a lens unit provided in the form of a bean with a thick middle and thin edges, or a lens unit in the form of a bean with a cut edge, or a lens unit with Fresnel patterns provided on the periphery of a bean, and does not constitute a limitation that the optical center of the lens unit is an ideal point.

[0085] In other words, under conditions where high precision is not required and under the limitations of actual production precision, the optical center of a lens unit with a single-point optical center design and the same light-gathering characteristics as a convex lens cannot be an ideal point. The introduction of a single-point optical center lens is only used to distinguish a continuous optical center lens with a continuous optical center design in the optical structure of the lens unit. Correspondingly, in pyroelectric infrared detection applications, for a lens unit with a single-point optical center design, the infrared spot formed by the infrared radiator in the corresponding field of view through the lens unit with a single-point optical center design at the sensitive element 101 is a point with a blurred boundary, while for a continuous optical center lens with a continuous optical center design, the infrared spot formed by the infrared radiator in the corresponding field of view through the lens unit with a continuous optical center design at the sensitive element 101 is linear.

[0086] Furthermore, refer to the accompanying drawings of the specification of this invention. Figure 8 As shown, in another embodiment of the present invention, the first lens 20A and the second lens 20B each have a first lens region 201A / B and a second lens region 202A / B arranged opposite to each other, and a third lens region 203A / B and a fourth lens region 204A / B arranged opposite to each other between the first lens region 201A / B and the second lens region 202A / B. The lens unit arrays of the first lens region 201A / B and the second lens region 202A / B are arrays of multiple continuous optically centered lenses, and the lens unit arrays of the third lens region 203A / B and the fourth lens region 204A / B are arrays of multiple single-point optically centered lenses. The optical centers of each continuous optically centered lens on the first lens 20A are continuously distributed along a straight line or curve in the length extension direction of the sensing element 101 of the first pyroelectric sensor 10A. The optical centers of each continuous optically centered lens on the second lens 20B are continuously distributed along a straight line or curve in the length extension direction of the sensing element 101 of the second pyroelectric sensor 10A. The length extension direction of the sensitive element 101 of 10B is continuously distributed along a straight line or curve. In this way, the length extension direction of the sensitive element 101 of the first pyroelectric sensor 10A and the second pyroelectric sensor 10B is different. This allows the field of view formed by the continuous optical center lens of the first pyroelectric sensor 10A through the first lens 20A to be complementary to the field of view formed by the continuous optical center lens of the second pyroelectric sensor 10B through the second lens 20B. It also allows the field of view formed by the first pyroelectric sensor 10A through the single-point optical center lens of the first lens 20A to be complementary to the field of view formed by the second pyroelectric sensor 10B through the single-point optical center lens of the second lens 20B. This achieves the interlacing between the field of view corresponding to the continuous optical center lens and the field of view corresponding to the single-point optical center lens, thereby simultaneously improving the sensitivity, signal strength and stability of the multi-probe interlaced infrared detection device in micro-motion detection scenarios.

[0087] It is worth mentioning that, when the first lens 20A and the second lens 20B are integrally connected as a single lens with two protrusions, the lens unit array of the first lens 20A and the second lens 20B is preferably as follows: Figure 9 The arrangement shown is in the form of a square pyramid, or a square pyramid with the top flattened, so as to avoid light path obstruction by keeping the lens unit arrays of the first lens 20A and the second lens 20B close to each other in a small volume.

[0088] Specifically, in the above embodiments of the present invention, when the length extension directions of the sensitive elements 101 of the first pyroelectric sensor 10A and the second pyroelectric sensor 10B are different, the length extension direction of the sensitive element 101 of the first pyroelectric sensor 10A is preferably set to be perpendicular to the length extension direction of the sensitive element 101 of the second pyroelectric sensor 10B within an error range of 5°, so that the sensitive elements 101 in the first pyroelectric sensor 10A and the second pyroelectric sensor 10B are set to an elongated shape with an aspect ratio greater than or equal to 2. When the sensitive elements 101 have different sensitivities and accuracies in the length and width directions, the design based on the fact that the length extension direction of the sensitive element 101 of the first pyroelectric sensor 10A is approximately perpendicular to the length extension direction of the sensitive element 101 of the second pyroelectric sensor 10B makes the multi-probe interleaved infrared detection device have similar and improved sensitivity and accuracy in different radial directions. This is beneficial to further ensure the stability of the multi-probe interleaved infrared detection device in micro-motion detection scenarios, and makes the multi-probe interleaved infrared detection device have similar and improved radial detection distance in moving detection scenarios.

[0089] Furthermore, in some other embodiments of the present invention, the multi-probe interleaved infrared detection device further includes a third pyroelectric sensor and a third lens independently matched to the third pyroelectric sensor. The sensitive element in the third pyroelectric sensor is also configured as a strip with an aspect ratio greater than or equal to 2, and is arranged side by side in the width direction with the same length extension direction. The length extension directions of the sensitive elements 101 of the first pyroelectric sensor 10A, the second pyroelectric sensor 10B, and the third pyroelectric sensor are different, and preferably satisfy the condition that the first pyroelectric sensor 10A, the second pyroelectric sensor 10B, and the third pyroelectric sensor have different length extension directions. In one of the pyroelectric sensors 10, the length extension direction of the sensitive element 101 is the reference direction. The length extension directions of the other two pyroelectric sensors 10 are rotated by 60° and 120° respectively relative to the reference direction within an error range of 5°. This staggered design based on the length extension directions of the sensitive elements 101 of multiple pyroelectric sensors 10 improves the sensitivity and accuracy of the multi-probe staggered infrared detection device while ensuring the convergence of sensitivity and accuracy in different radial directions. This, in turn, ensures the reliability and stability of the multi-probe staggered infrared detection device in micro-motion detection scenarios.

[0090] In particular, refer to the accompanying drawings of the specification of this invention. Figure 10A and Figure 10BAs shown, based on the variation in the number or structure of the pyroelectric sensors in the multi-probe interleaved infrared detection device, the structural principle of another embodiment of the multi-probe interleaved infrared detection device according to the present invention is illustrated. The multi-probe interleaved infrared detection device further includes a third pyroelectric sensor 10C and a fourth pyroelectric sensor 10D, and a third lens 20C and a fourth lens 20D, respectively independently matched to the third pyroelectric sensor 10C and the fourth pyroelectric sensor 10D. The sensitive elements 101 in the third pyroelectric sensor 10C and the fourth pyroelectric sensor 10D are also set as elongated strips with an aspect ratio greater than or equal to 2. Furthermore, the sensitive elements 101 of the same pyroelectric sensor 10 are arranged side-by-side in the width direction and have the same length extension direction. The first pyroelectric sensor 10A, the second pyroelectric sensor 10B, the third pyroelectric sensor 10C, and the fourth pyroelectric sensor 10D have different... The length extension directions of the sensitive elements 101 of the pyroelectric sensor 10 are different, and preferably, when the length extension direction of the sensitive element 101 of one of the first pyroelectric sensor 10A, the second pyroelectric sensor 10B, the third pyroelectric sensor 10C, and the fourth pyroelectric sensor 10D is taken as the reference direction, the length extension directions of the other three sensitive elements 101 of the pyroelectric sensor 10 are rotated in the same direction by 45°, 90°, and 135° respectively relative to the reference direction within an error range of 5°. In this way, based on the staggered design of the length extension directions of the sensitive elements 101 of multiple pyroelectric sensors 10, the sensitivity and accuracy of the multi-probe staggered infrared detection device are improved, while ensuring the convergence of the sensitivity and accuracy of the multi-probe staggered infrared detection device in different radial directions, thereby ensuring the reliability and stability of the multi-probe staggered infrared detection device in micro-motion detection scenarios.

[0091] Specifically, in this embodiment of the invention, wherein, with the length extension direction of the first pyroelectric sensor sensing element 10A as the reference direction, the length extension directions of the sensing elements 101 of the second pyroelectric sensor 10B, the third pyroelectric sensor 10C, and the fourth pyroelectric sensor 10D are rotated in the same direction by 45°, 90°, and 135° respectively relative to the reference direction within an error range of 5°, and satisfying the requirements of the first pyroelectric sensor 10A, the second pyroelectric sensor 10B, the third pyroelectric sensor 10D, and the fourth pyroelectric sensor 10D. If the positions of sensor 10C and the fourth pyroelectric sensor 10D are arranged sequentially around the same rotation direction, then the position of the first pyroelectric sensor 10A is opposite to the position of the third pyroelectric sensor 10C, and the length extension direction of the sensitive element 101 of the first pyroelectric sensor 10A is approximately perpendicular to the length extension direction of the sensitive element 101 of the third pyroelectric sensor 10C. The position of the second pyroelectric sensor 10B is opposite to the position of the fourth pyroelectric sensor 10D, and the second pyroelectric sensor 10B is perpendicular to the position of the fourth pyroelectric sensor 10D. The length extension direction of the sensitive element 101 of 0B is approximately perpendicular to the length extension direction of the sensitive element 101 of the fourth pyroelectric sensor 10D. This allows the multi-probe interleaved infrared detection device to achieve vertical interleaving between the field of view formed by the first pyroelectric sensor 10A through the first lens 20A and the field of view formed by the third pyroelectric sensor 10C through the third lens 20C, and the field of view formed by the second pyroelectric sensor 10B through the second lens 20B and the field of view formed by the fourth pyroelectric sensor 10D through the fourth lens 20D, respectively. Simultaneously, it achieves complementarity between the two interleaved fields of view, thereby simultaneously improving the sensitivity, signal strength, and stability of the multi-probe interleaved infrared detection device in micro-motion detection scenarios.

[0092] In other words, in this embodiment of the present invention, based on the difference in the distribution density of the optical centers at different positions of the first lens 20A, the second lens 20B, the third lens 20C, and the fourth lens 20D, the field of view distribution range formed by the first pyroelectric sensor 10A through the first lens 20A is the same as the field of view distribution range formed by the third pyroelectric sensor 10C through the third lens 20C, and the field of view distribution range formed by the second pyroelectric sensor 10B through the second lens 20B is the same as the field of view distribution range formed by the fourth pyroelectric sensor 10D through the fourth lens 20D, and these two field of view distribution ranges are... The fields of view can complement each other and cover a 360° angular range. Thus, the fields of view formed by the first pyroelectric sensor 10A through the first lens 20A and the third pyroelectric sensor 10C through the third lens 20C are vertically intersected, and the fields of view formed by the second pyroelectric sensor 10B through the second lens 20B and the fourth pyroelectric sensor 10D through the fourth lens 20D are vertically intersected. This creates an interlaced distribution of fields of view within a 360° angular range, thereby simultaneously improving the sensitivity, signal strength, and stability of the multi-probe interlaced infrared detection device in micro-motion detection scenarios.

[0093] For example, when the lens unit array of the first lens 20A is divided into a first array and a second array arranged opposite each other, and a third array and a fourth array arranged opposite each other between the first array and the second array, when the optical center design of the lens units in the first array and the second array both satisfy the requirement of having a relatively sparse optical center distribution density near the edges of the third array and the fourth array, and the optical center design of the lens units in the third array and the fourth array both satisfy the requirement of having a relatively sparse optical center distribution density near the edges of the first array and the second array, the field of view distribution range formed by the first pyroelectric sensor 10A through the first lens 20A is concentrated in four regions that are opposite to each other and spaced apart. Thus, the length extension direction of the sensitive element 101 of the second pyroelectric sensor 10B, the third pyroelectric sensor 10C, and the fourth pyroelectric sensor 10D corresponds to the aforementioned description relative to... When the extension direction of the sensitive element 101 of the first pyroelectric sensor 10A is rotated by 45°, 90° and 135° respectively within an error range of 5°, and the second lens 20B, the third lens 20C and the fourth lens 20D have the same lens unit array design as the first lens 20A, and are rotated by 45°, 90° and 135° respectively within an error range of 5° relative to the first lens 20A, the field of view formed by the first pyroelectric sensor 10A through the first lens 20A and the field of view formed by the third pyroelectric sensor 10C through the third lens 20C will be staggered in four regions that are opposite to each other and spaced apart. The field of view formed by the second pyroelectric sensor 10B through the second lens 20B and the field of view formed by the fourth pyroelectric sensor 10D through the fourth lens 20D will be staggered in another four regions that are opposite to each other and spaced apart. These eight regions will complement each other and form a staggered distribution of the field of view within a 360° angular range.

[0094] It is understood that, based on different application scenario requirements, in some embodiments of the present invention, the multi-probe interlaced infrared detection device is configured to achieve a high-density and high-uniformity field-of-view projection distribution in a small-angle space based on an interlaced distribution of the field of view, thereby achieving higher precision and more stable micro-motion detection in this small-angle space, distinct from the surrounding space. In other embodiments of the present invention, the multi-probe interlaced infrared detection device is configured to achieve a high-density and high-uniformity field-of-view projection distribution in the target space based on complementary or spliced ​​(including partially overlapping splicing) interlaced distribution of the field of view, thereby achieving higher precision and more stable micro-motion detection in the target space.

[0095] For example, in some embodiments of the present invention, in the field of view distribution space formed by one of the pyroelectric sensors 10 through a corresponding lens or lens area in the multi-probe interleaved infrared detection device, another pyroelectric sensor 10 through a corresponding lens or lens area is distributed in the field of view distribution space based on the interleaved field of view in the local space, thereby achieving a high-density and high-uniformity field of view projection distribution in the local space. It also allows for the complementarity or splicing of the local interleaved field of view spaces formed by multiple pyroelectric sensors 10 through corresponding lenses or lens areas in the field of view distribution space, thereby achieving a high-density and high-uniformity interleaved field of view distribution as a whole in the field of view distribution space, thereby achieving higher precision and more stable micro-motion detection in the field of view distribution space.

[0096] It is worth mentioning that the light in the light-related description of this invention refers to invisible light emitted by an infrared radiator. The corresponding description is only for better understanding of the principle of this invention from an optical perspective, and does not constitute a limitation on whether the multi-probe interleaved infrared detection device of this invention emits corresponding light. The multi-probe interleaved infrared detection device of this invention belongs to the field of passive infrared detection and can be widely used in intelligent control scenarios based on human activity (including micro-motion). For example, it can be used to intelligently control electrical appliances such as lighting, air conditioning, and curtains in office or home environments based on human activity through ceiling mounting or wall mounting to achieve intelligent lighting control and smart home control.

[0097] It will be understood by those skilled in the art that the above embodiments are merely examples, and features of different embodiments can be combined with each other to obtain implementation methods that are readily conceivable according to the content disclosed in the present invention but are not explicitly shown in the accompanying drawings.

[0098] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and any variations or modifications may be made to the implementation of the present invention without departing from the stated principles.

Claims

1. A multi-probe interleaved infrared detection device, characterized in that, include: At least two pyroelectric sensors, comprising a first pyroelectric sensor and a second pyroelectric sensor, each having at least two sets of sensitive elements. Each set of sensitive elements has an even multiple of the number of sensitive elements and is located in the same signal channel. Both the first and second pyroelectric sensors are configured with at least two signal channels. The sensitive elements in both the first and second pyroelectric sensors are elongated strips with an aspect ratio greater than or equal to 2. The sensitive elements of the first pyroelectric sensor are arranged side-by-side in the width direction with the same length extension direction, as are the sensitive elements of the second pyroelectric sensor. Adjacent sensitive elements on the same pyroelectric sensor in both the first and second pyroelectric sensors are located in different signal channels and have a gap width of less than or equal to 0.8 mm in the width direction. Furthermore, the first and second pyroelectric sensors have different sensitive element length extension directions. The first lens and the second lens are independently matched to the first pyroelectric sensor and the second pyroelectric sensor, respectively.

2. The multi-probe interleaved infrared detection device according to claim 1, wherein the first pyroelectric sensor and the second pyroelectric sensor are both configured in a quaternary form with dual channels, comprising four sensitive elements, wherein the sensitive elements corresponding to the same pyroelectric sensor are configured in a strip shape with an aspect ratio greater than or equal to 2 and arranged side by side in the width direction, and the four sensitive elements are named the first sensitive element, the second sensitive element, the third sensitive element and the fourth sensitive element respectively according to the side-by-side arrangement order in the width direction, wherein the first sensitive element and the third sensitive element are in the same signal channel, and the second sensitive element and the fourth sensitive element are in another signal channel.

3. The multi-probe interleaved infrared detection device according to claim 2, wherein the lens unit array of the first lens and the second lens is an array arrangement of multiple single-point optically oriented lenses.

4. The multi-probe interleaved infrared detection device according to claim 3, wherein the lens unit array of the first lens and the second lens is an array arrangement of multiple lens units arranged in the form of Fresnel lenses.

5. The multi-probe interleaved infrared detection device according to claim 3, wherein the lens unit array of the first lens and the second lens is an array arrangement of multiple lens units arranged in a bean-like shape with a thick center and thin edges.

6. The multi-probe interleaved infrared detection device according to claim 2, wherein the lens unit arrays of the first lens and the second lens are both arrays of multiple continuous optical center lenses, wherein the continuous optical center direction of each continuous optical center lens on the first lens matches the length extension direction of the sensitive element of the first pyroelectric sensor, and the continuous optical center direction of each continuous optical center lens on the second lens matches the length extension direction of the sensitive element of the second pyroelectric sensor.

7. The multi-probe interleaved infrared detection device according to claim 2, wherein the first lens and the second lens each have a first lens area and a second lens area arranged opposite to each other, and a third lens area and a fourth lens area arranged opposite to each other between the first lens area and the second lens area, wherein the lens unit arrays of the first lens area and the second lens area are arrays of multiple continuous optically centered lenses, and the lens unit arrays of the third lens area and the fourth lens area are arrays of multiple single-point optically centered lenses, wherein the continuous optical center direction of each continuous optically centered lens on the first lens matches the length extension direction of the sensitive element of the first pyroelectric sensor, and the continuous optical center direction of each continuous optically centered lens on the second lens matches the length extension direction of the sensitive element of the second pyroelectric sensor.

8. The multi-probe interleaved infrared detection device according to any one of claims 1 to 7, wherein the first lens and the second lens have the same lens unit array design.

9. The multi-probe interleaved infrared detection device according to claim 8, wherein the first lens and the second lens are integrally connected as a single lens having two protrusions.

10. The multi-probe interleaved infrared detection device according to claim 9, wherein the lens unit array of the first lens and the second lens is arranged in a square pyramid shape.

11. The multi-probe interleaved infrared detection device according to claim 9, wherein the lens unit array of the first lens and the second lens is arranged in a square pyramid shape with the top flattened.

12. The multi-probe interleaved infrared detection device according to any one of claims 1 to 7, wherein the length extension direction of the sensitive element of the first pyroelectric sensor tends to be perpendicular to the length extension direction of the sensitive element of the second pyroelectric sensor within an error range of 5°.

13. The multi-probe interleaved infrared detection device according to any one of claims 1 to 7, wherein the multi-probe interleaved infrared detection device further includes a third pyroelectric sensor and a third lens independently matched to the third pyroelectric sensor, wherein the sensitive element in the third pyroelectric sensor is also configured as a strip shape with an aspect ratio greater than or equal to 2, and is arranged side by side in the width direction with the same length extension direction, and the length extension direction of the sensitive elements of the first pyroelectric sensor, the second pyroelectric sensor and the third pyroelectric sensor is different.

14. The multi-probe interleaved infrared detection device according to claim 13, wherein the length extension direction of the sensitive element of one of the pyroelectric sensors (the first, second, and third pyroelectric sensors) is taken as the reference direction, and the length extension directions of the sensitive elements of the other two pyroelectric sensors are rotated in the same direction by 60° and 120° respectively relative to the reference direction within an error range of 5°.

15. The multi-probe interleaved infrared detection device according to any one of claims 1 to 5, wherein the multi-probe interleaved infrared detection device further includes a third pyroelectric sensor and a fourth pyroelectric sensor, and a third lens and a fourth lens independently matched to the third pyroelectric sensor and the fourth pyroelectric sensor, respectively, wherein the sensitive elements in the third pyroelectric sensor and the fourth pyroelectric sensor are also configured as elongated strips with an aspect ratio greater than or equal to 2, and the sensitive elements of the same pyroelectric sensor are arranged side by side in the width direction and have the same length extension direction, wherein the length extension direction of the sensitive elements of the first pyroelectric sensor, the second pyroelectric sensor, the third pyroelectric sensor and the fourth pyroelectric sensor is different.

16. The multi-probe interleaved infrared detection device according to claim 15, wherein the length extension direction of the sensitive element of one of the pyroelectric sensors (the first, second, third, and fourth pyroelectric sensors) is taken as the reference direction, and the length extension directions of the sensitive elements of the other three pyroelectric sensors are rotated in the same direction by 45°, 90°, and 135° respectively, within an error range of 5° relative to the reference direction.

17. The multi-probe staggered infrared detection device according to claim 16, wherein the first pyroelectric sensor, the second pyroelectric sensor, the third pyroelectric sensor, and the fourth pyroelectric sensor are arranged sequentially around the same rotation direction, wherein the position of the first pyroelectric sensor is opposite to the position of the third pyroelectric sensor, and the length extension direction of the sensitive element of the first pyroelectric sensor tends to be perpendicular to the length extension direction of the sensitive element of the third pyroelectric sensor; the position of the second pyroelectric sensor is opposite to the position of the fourth pyroelectric sensor, and the length extension direction of the sensitive element of the second pyroelectric sensor tends to be perpendicular to the length extension direction of the sensitive element of the fourth pyroelectric sensor.

18. The multi-probe interleaved infrared detection device according to claim 17, wherein the lens unit array of the first lens is divided into a first array and a second array arranged opposite to each other, and a third array and a fourth array arranged opposite to each other between the first array and the second array, wherein the optical center design of the lens units in the first array and the second array satisfies that they have a relatively sparse optical center distribution density near the edges of the third array and the fourth array, and the optical center design of the lens units in the third array and the fourth array satisfies that they have a relatively sparse optical center distribution density near the edges of the first array and the second array, wherein the second lens, the third lens and the fourth lens have the same lens unit array design as the first lens, and are rotated in the same direction by 45°, 90° and 135° respectively relative to the first lens within an error range of 5°.

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