A sensor and a sensing system thereof

Abstract

The invention discloses a sensor and a sensing system for automatically judging the entry and exit of a human body, comprising a shell and an electronic substrate, wherein a sensor is arranged on the surface of the electronic substrate facing the inside of the shell, a window is arranged on the side wall of the shell facing the sensor, and a Fresnel lens located between the sensor and the window is arranged in the shell; the sensor comprises two sensing elements distributed along the direction of the entry and exit of the human body and used for detecting the strength of infrared radiation of the human body and outputting a radiation detection signal; a controller electrically connected to the sensor is arranged on the electronic substrate, and the controller stores and analyzes the radiation detection signal; the window can control the recognition area of ​​the sensor to a certain range, so that a person can be detected by the sensor only when he reaches the range; in order to adapt to different application places, the detection area of ​​the sensor is changed by changing the shape of the window, so that the degree of humanization is high and the scope of application is wide.

Description

Technical Field

[0001] The present invention relates to the field of sensor technology, and more particularly to a sensor and a sensing system thereof. Background Art

[0002] In order to provide humanized services, some service stores usually have an induction announcer at the door, which automatically announces "Welcome" when it senses someone approaching, thereby achieving the dual functions of reminding people to enter and welcoming guests. The induction announcer includes an induction element and a Fresnel lens covering the induction element. Fresnel lenses are mostly made of polyolefin and other materials by injection molding. They can be classified according to optical design or structure. They have three functions: one is focusing; the second is that moving objects in the detection area can generate variable heat release infrared signals on the passive infrared (PIR) in the form of temperature changes; the third is collimation, which collimates the light emitted by the active infrared detector and projects it onto the photoreceiver lens for focusing, converting the optical signal into an electrical signal.

[0003] However, the induction broadcaster detects the entry and exit of people through infrared sensing, and the infrared sensing area is three-dimensional, and it is impossible to judge whether a person is entering or passing by, so that voice broadcasting will also occur when a person passes by. The degree of humanization is not ideal and the scope of application is relatively narrow. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the first purpose of the present invention is to provide a sensor that can identify whether there are people entering or leaving a small area, thereby solving the problem of unsatisfactory humanization.

[0005] The above technical purpose of the present invention is achieved through the following technical scheme: a sensor includes a shell and an electronic substrate, the electronic substrate is provided with a sensor, the shell is provided with a limiting part for limiting the detection area of ​​the sensor, and the limiting part is provided with a window for infrared signal transmission.

[0006] By adopting the above technical solution, the window can control the recognition area of ​​the sensor to a certain range, so that people can be detected by the sensor only when they reach the range, thereby controlling the voice module to output a voice signal; in order to adapt to different application places, the shape of the window is changed to change the detection area of ​​the sensor, which has a high degree of humanization and a wide range of applications.

[0007] Preferably, the sensor comprises two sensing elements, a partition plate is provided in the shell for dividing the shell into two chambers, and the two sensing elements are evenly located on both sides of the partition plate.

[0008] By adopting the above technical solution, the partition plate can separate the detection areas of the two sensing elements, so as to avoid the situation where when the two sensing elements detect a person at the same time, the amount of electronic charge movement in the sensor is small, resulting in a weak radiation detection signal; at the same time, the partition plate can form two detection areas around the sensor, and for the door that needs to be entered, one area is formed inside and outside the door, thereby increasing the experience of the person.

[0009] Preferably, a Fresnel lens is further provided between the sensor and the window.

[0010] By adopting the above technical solution, the Fresnel lens utilizes the special optical principle of the lens to improve the detection and receiving sensitivity of the sensor.

[0011] Preferably, the inner wall of the shell facing the sensor is in the shape of an outwardly convex arc surface, and the Fresnel lens is attached to the inner wall of the shell.

[0012] By adopting the above technical solution, the curved inner wall can make the Fresnel lens fit better on the inner wall of the shell, reduce the external dust from entering the shell through the window, so that the sensor can better detect people; at the same time, reduce the damage caused by dust to the components on the electronic substrate.

[0013] In view of the above-mentioned deficiencies in the prior art, the second purpose of the present invention is to provide a sensing system that can adapt to situations where it is necessary to distinguish the entry and exit of people, thereby solving the problem of the unsatisfactory degree of humanization.

[0014] The above technical objectives of the present invention are achieved through the following technical solutions: an induction system, comprising:

[0015] A sensor, comprising at least two sensing elements and a partition plate, wherein the partition plate separates adjacent detection areas corresponding to the sensing elements, and a boundary is defined between adjacent detection areas, wherein the sensing elements are used to continuously collect sensing signals reflecting the position of the detection target within the detection area; and

[0016] The controller is used to determine that the detection target crosses the boundary in a moving direction according to the amplitude change trend of the sensing signal continuously collected from each of the sensing elements.

[0017] By adopting the above technical solution, when a person passes under the sensor, the amplitude of the sensing signal of the sensing element in the detection area changes; when the partition plate separates the detection area of ​​the sensing element, the amplitude change trend of the sensing signal is different when the person enters or goes out, thereby distinguishing whether the person is entering or leaving, which is more humane.

[0018] Preferably, the two sensing elements are electrically connected, and the amplitudes of the continuously combined sensing signals are defined as A1, A2, A3, and A4;

[0019] When A1-A2<0, A2-A3<0 and A4-A3>0, the controller (10) outputs a first feedback signal;

[0020] When A1-A2>0, A2-A3>0 and A4-A3<0, the controller (10) outputs a second feedback signal.

[0021] By adopting the above technical solution, when a person passes through the detection area of ​​the sensor, the two sensing elements will detect the person one after another, causing the electronic charge inside the sensor to move and shift between the two sensing elements, and causing the sensing signals of the two sensing elements to be merged together, making the tendency of the sensing signal to change greater; the controller can determine whether the person is entering or exiting according to the different trends of the sensing signal changes, so that the judgment is more accurate.

[0022] Preferably, it also includes a reminder module, which is electrically connected to the controller; the reminder module is a voice announcer, and when the controller outputs a first feedback signal, the voice announcer plays a first voice message; when the controller outputs a second feedback signal, the voice announcer plays a second voice message.

[0023] By adopting the above technical solution, the staff receives the first voice message and the second voice message to determine whether there are people entering or leaving.

[0024] Preferably, the controller is provided with a signal threshold X, and when (A1-A2)+(A2-A3)+(A3-A4)>X, the controller outputs the first feedback signal or the second feedback signal.

[0025] By adopting the above technical solution, when animals such as dogs and cats enter the detection area, they will also be detected by the sensor, and the controller will control the reminder module to send out a corresponding reminder signal; by setting the signal threshold, when the controller calculates that the value is less than the threshold, the controller controls the reminder module to remain unchanged, so that dogs, cats and other animals will not send out a reminder signal when entering the detection area.

[0026] In summary, the present invention has the following beneficial effects: the window can control the recognition area of ​​the sensor to a certain range, so that people can be detected by the sensor only when they reach the range; in order to adapt to different application places, the detection area of ​​the sensor is changed by changing the shape of the window, which has a high degree of humanization and a wide range of applications; when a person passes through the detection area of ​​the sensor, the two sensing elements will absorb infrared rays successively, causing the electronic charge inside the sensor to move and shift, thereby causing the radiation detection signal to gradually change; the controller can judge whether the person is entering or going out according to the different trends of the radiation detection signal changes, thereby controlling the reminder module to output different reminder signals. Brief Description of the Drawings

[0027] Figure 1 is a schematic structural diagram of an embodiment of the present invention;

[0028] Figure 2 is a partial exploded view of an embodiment of the present invention.

[0029] In the figure: 1, housing; 101, bottom shell; 102, cover shell; 2, electronic substrate; 3, sensor; 4, window; 5, Fresnel lens; 6, partition board; 7, mounting seat; 8, recessed groove; 9, insertion post; 10, controller; 111, first indicator light; 112, second indicator light; 113, voice broadcaster. Detailed Description of the Invention

[0030] The present invention will be further described in detail below with reference to the accompanying drawings.

[0031] An inductor and its induction system, as Figure 1 and Figure 2 shown, includes a housing 1 and an electronic substrate 2. Among them, the housing 1 includes a bottom shell 101 and a cover shell 102 inserted into the bottom shell 101. The bottom shell 101 has openings on both sides, the cover shell 102 is in a U shape, and the housing 1 formed by splicing the cover shell 102 and the bottom shell 101 has an opening on one side; threaded holes (not shown in the figure) are opened on both the bottom shell 101 and the cover shell 102, and mounting holes (not shown in the figure) corresponding to the threaded holes are opened on the electronic substrate 2. After the screws pass through the mounting holes, they are threadedly connected to the threaded holes, and the bottom shell 101 and the cover shell 102 are fixedly connected together through the electronic substrate 2, which is simple and fast.

[0032] An mounting seat 7 is connected to the outside of the housing 1. The mounting seat 7 is in a U shape, and the two ends of the mounting seat 7 are small and the middle is large. The mounting seat 7 is convenient for fixing the housing 1 at the place to be installed; two symmetrical recessed grooves 8 are opened on the outer wall of the bottom shell 101. Insertion posts 9 are integrally formed at both ends of the mounting seat 7. The insertion posts 9 are inserted and matched with the recessed grooves 8, and the insertion posts 9 are cylindrical. Through the elastic deformation of the mounting seat 7, the mounting seat 7 is initially fixed on the housing 1, and the housing 1 can rotate on the mounting seat 7 along the insertion posts 9, which is convenient for adjusting the orientation direction of the housing 1. A screw hole is opened at the bottom of the recessed groove 8, and a connection hole penetrating the insertion post 9 is opened on the mounting seat 7. After the screw passes through the connection hole, it is threadedly connected to the screw hole, and the mounting seat 7 is fixedly connected to the bottom shell 101 through the screw, which is simple and fast.

[0033] The surface of the electronic substrate 2 facing the inside of the housing 1 is equipped with a sensor 3, which includes two sensing elements (not shown in the figure), which are used to detect the strength of infrared radiation from the human body and output sensing signals. A controller 10 is installed on the electronic substrate 2, and the controller 10 is electrically connected to the sensor 3. The controller 10 stores and analyzes the sensing signals; a reminder module is installed on the electronic substrate 2, and the reminder module is electrically connected to the controller 10.

[0034] The side wall of the bottom shell 101 facing the sensor 3 is a limiting part (not shown in the figure), which is used to limit the detection area of ​​the sensor 3. The limiting part is provided with windows 4 for infrared signal transmission. There are two windows 4, which are parallel to each other in long strips. The two windows 4 can form two detection areas around the sensor 3. For the door that needs to be entered, one area is formed inside and outside the door, which increases the experience of the personnel; the long strip detection area can better cover the area facing the door, and the personnel can be detected when passing through the door.

[0035] A partition plate 6 is integrally formed in the bottom shell 101 to divide the shell 1 into two chambers. The two windows 4 are respectively located on both sides of the partition plate 6, and the two sensing elements are also respectively located on both sides of the partition plate 6. The partition plate 6 can separate the detection areas of the two sensing elements to avoid the situation where the two sensing elements detect a person at the same time, resulting in a small amount of electronic charge movement in the sensor 3, resulting in a very weak radiation detection signal.

[0036] A Fresnel lens 5 is installed in the bottom shell 101. The Fresnel lens 5 is located between the sensor 3 and the window 4. There is a gap between the partition plate 6 and the bottom shell 101. The Fresnel lens 5 is inserted into the gap to preliminarily fix the Fresnel lens 5. The side wall of the shell 1 facing the sensor 3 is in an arc shape convex outward. The Fresnel lens 5 is attached to the inner wall of the shell 1, and the cover shell 102 is pressed against the two ends of the Fresnel lens 5. The arc-shaped inner wall can make the Fresnel lens 5 better fit on the inner wall of the shell 1, reducing the external dust from entering the shell 1 through the window 4. At the same time, the cover shell 102 is pressed against the two ends of the Fresnel lens 5 to fix the Fresnel lens 5, thereby making the Fresnel lens 5 fit more tightly to the inner wall of the shell 1.

[0037] The sensor 3 includes at least two sensing elements and a partition plate 6, wherein the partition plate 6 separates adjacent detection areas corresponding to the sensing elements, and defines a boundary between adjacent detection areas. The sensing elements are used to continuously collect sensing signals reflecting the position of the detection target in the detection area; and

[0038] The controller 10 is used to determine whether the detection target crosses the boundary in a moving direction according to the amplitude variation trend of the sensing signal continuously collected from each sensing element.

[0039] When a person passes under the sensor 3, the amplitude of the sensing signal of the sensing element in the detection area changes; when the partition plate separates the detection area of ​​the sensing element, the amplitude change trend of the sensing signal when a person enters or leaves is different, thereby distinguishing whether a person is entering or leaving, which is more humane.

[0040] The two sensing elements are electrically connected, and the two sensing elements will detect people one after another, causing the electronic charges in the two sensing elements to move and shift between the two sensing elements, and merging the sensing signals of the two sensing elements together, making the tendency of the sensing signals to change greater.

[0041] The amplitudes of the continuously combined sensing signals are defined as A1, A2, A3, and A4; when A1-A2<0, A2-A3<0, and A4-A3>0, the controller (10) outputs a first feedback signal; when A1-A2>0, A2-A3>0, and A4-A3<0, the controller (10) outputs a second feedback signal. Several sensing signals can also be collected per unit time, so that the sensor 3 can more accurately determine whether a person enters or exits; in addition, the value of A2 can be assigned to A1, the value of A3 can be assigned to A2, the value of A4 can be assigned to A3, and the newly detected value can be assigned to A4.

[0042] The reminder module is a voice announcer. When the controller 10 outputs a first feedback signal, the voice announcer plays a first voice message; when the controller 10 outputs a second feedback signal, the voice announcer plays a second voice message.

[0043] In other embodiments, the reminder module includes a first indicator light 111 and a second indicator light 112. When the controller 10 outputs a first feedback signal, the first indicator light 111 starts to emit light; when the controller 10 outputs a second feedback signal, the second indicator light 112 starts to emit light. The staff observes the light emission of the first indicator light 111 and the second indicator light 112 to determine whether there is anyone entering or exiting.

[0044] The controller 10 is provided with a signal threshold value X. When (A1-A2)+(A2-A3)+(A3-A4)>X, the controller 10 outputs a first feedback signal or a second feedback signal. When animals such as dogs and cats enter the detection area, they will also be detected by the sensor 3, and the controller 10 will control the reminder module to send out a corresponding reminder signal. By setting the signal threshold value, when the controller 10 calculates that the value is less than the threshold value, the controller 10 controls the reminder module to remain unchanged, so that dogs, cats and other animals will not send out a reminder signal when they enter the detection area.

[0045] The above embodiments are merely explanations of the present invention and are not limitations of the present invention. After reading this specification, those skilled in the art may make modifications to the embodiments without any creative contribution as needed. However, such modifications are protected by the patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A sensor, Its characteristics are: The invention comprises a shell (1) and an electronic substrate (2), wherein a sensor (3) is provided on the electronic substrate (2), and a limiting portion for limiting the detection area of ​​the sensor (3) is provided on the shell (1), and a window (4) for transmitting infrared signals is provided on the limiting portion; the sensor (3) comprises two sensing elements, and a partition plate (6) for dividing the shell (1) into two chambers is provided inside the shell (1), and the two sensing elements are evenly located on both sides of the partition plate (6); a Fresnel lens (5) is also provided between the sensor (3) and the window (4); the inner wall of the shell (1) facing the sensor (3) is in the shape of an arc surface convex outwards, and the Fresnel lens (5) is attached to the inner wall of the shell (1).

2. A sensing system using the sensor as claimed in claim 1, Its characteristics are: include: The sensor (3) comprises at least two sensing elements and a partition plate (6), wherein the partition plate (6) separates adjacent detection areas corresponding to the sensing elements, and defines a boundary between adjacent detection areas, and the sensing elements are used to continuously collect sensing signals reflecting the position of a detection target within the detection area; And, a controller (10) is used to determine that the detection target crosses the boundary in a moving direction according to the amplitude change trend of the sensing signal continuously collected from each of the sensing elements.

3. A sensing system according to claim 2, Its characteristics are: The two sensing elements are electrically connected, and the amplitudes of the continuously combined sensing signals are defined as A1, A2, A3, and A4; when A1-A2<0, A2-A3<0, and A4-A3>0, the controller (10) outputs a first feedback signal; when A1-A2>0, A2-A3>0, and A4-A3<0, the controller (10) outputs a second feedback signal.

4. A sensing system according to claim 3, Its characteristics are: The device also comprises a reminder module, the reminder module being electrically connected to the controller (10); the reminder module being a voice announcer (113); when the controller (10) outputs a first feedback signal, the voice announcer (113) plays a first voice message; when the controller (10) outputs a second feedback signal, the voice announcer (113) plays a second voice message.

5. A sensing system according to claim 3, Its characteristics are: The controller (10) is provided with a signal threshold value X. When (A1-A2)+(A2-A3)+(A3-A4)>X, the controller (10) outputs a first feedback signal or a second feedback signal.

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