Infrared sensor and monitoring equipment
By setting up an electronically controlled atomized film on the lens of the infrared sensor, switching the working state of the film to change the detection area, the problem of the PIR sensor detection area not matching the camera's recording range is solved, and the flexibility and efficient detection of the monitoring equipment are achieved.
Patent Information
- Application Number
- CN202421398538.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-18
- Publication Date
- 2025-04-18
- Estimated Expiration
- 2034-06-18
AI Technical Summary
In existing monitoring equipment, when the recording range of the camera changes, the detection area of the PIR sensor is fixed and cannot match the recording range of the camera, resulting in a mismatch in the detection area, affecting the flexibility and accuracy of the monitoring equipment.
An infrared sensor is designed, and an electronically controlled atomized film is installed on the lens. The film has two working states: atomization and transparency. By switching the working state of the film, the detection area of the infrared sensor is changed, making it flexible and variable and can match the recording range of the camera.
It realizes flexible changes in infrared sensor detection areas, can match the recording range of the camera, meets the monitoring flexibility needs of monitoring equipment, and improves detection accuracy and system power consumption management.
Smart Images
Figure CN222774669U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of monitoring technology, and in particular to an infrared sensor and a monitoring device. Background Art
[0002] Compared with cameras, PIR (Passive InfraRed Sensors) are widely used in security, lighting and other application fields due to their lower power consumption and cost advantages. PIR can detect the movement of people or animals and wake up the camera based on the detection results to ensure that the monitoring equipment has low power consumption and does not lose important video information. In current monitoring equipment, the camera's recording range will change when the camera zooms or the pan / tilt rotates, but the detection area of the PIR on the camera is fixed, which makes the PIR's detection area unable to match the camera's recording range. Utility Model Content
[0003] The embodiments of the present application provide an infrared sensor and a monitoring device to solve at least one of the above-mentioned technical problems.
[0004] The infrared sensor of the embodiment of the present application includes a lens, a pyroelectric sensor and a signal processing circuit;
[0005] The lens is used to receive external infrared radiation signals, amplify the infrared radiation signals, and converge them to the pyroelectric sensor;
[0006] The pyroelectric sensor is used to generate an electrical signal according to the infrared radiation signal;
[0007] The signal processing circuit is connected to the pyroelectric sensor and is used to perform signal processing on the electrical signal;
[0008] The infrared sensor also includes an electrically controlled atomizing film, which is arranged on the lens. The electrically controlled atomizing film has two working states: atomizing and transparent. When the working state of the electrically controlled atomizing film is switched, the detection area of the infrared sensor changes.
[0009] In some embodiments, the lens includes an inner surface and an outer surface facing each other, and the outer surface faces the outside of the infrared sensor;
[0010] The electrically controlled atomizing film is attached to the inner surface; or
[0011] The electrically controlled atomizing film is attached to the outer surface.
[0012] In some embodiments, the electrically controlled atomizing film includes a first glass layer, a liquid crystal film layer, and a second glass layer, wherein the liquid crystal film layer is located between the first glass layer and the second glass layer;
[0013] When the power-on state of the electrically controlled atomizing film changes, the refractive index of the liquid crystal film layer changes, so that the working state of the electrically controlled atomizing film is switched.
[0014] In some embodiments, the liquid crystal film layer includes a polymer and a liquid crystal disposed in the polymer;
[0015] When the electrically controlled atomizing film is not powered, the refractive index of the liquid crystal is less than the refractive index of the polymer, and the electrically controlled atomizing film is in an atomized state;
[0016] When the electrically controlled atomizing film is powered on, the refractive index of the liquid crystal is equal to the refractive index of the polymer, and the electrically controlled atomizing film is in a transparent state.
[0017] In some embodiments, the lens includes a plurality of connected sub-lenses, each of which is used to receive the infrared radiation signal from a corresponding solid angle space.
[0018] In some embodiments, the electrically controlled atomizing film includes a plurality of sub-films, the plurality of sub-films respectively correspond to a plurality of sub-lenses, and each of the sub-films is disposed on a corresponding sub-lens.
[0019] In some embodiments, the infrared sensor further includes a control unit and a control harness, wherein the control unit is connected to the control harness, and the control harness is connected to the plurality of sub-films for controlling the working states of the plurality of sub-films.
[0020] In some embodiments, the number of the control harness is multiple;
[0021] Each of the control harnesses is connected to one of the sub-films, respectively, for controlling the working state of a corresponding sub-film; or
[0022] Each of the control harnesses is connected to a plurality of the sub-films at the same time, and is used to simultaneously control the working states of the corresponding plurality of the sub-films.
[0023] In some embodiments, the control harness is fixed at the joints between the plurality of sub-lenses and converges to a side of the pyroelectric sensor facing away from the lens.
[0024] The monitoring device of the embodiment of the present application includes a camera and an infrared sensor of any of the above embodiments.
[0025] In the infrared sensor and monitoring device of the embodiment of the present application, an electrically controlled atomizing film is provided on the lens, and the electrically controlled atomizing film has two working states: atomizing and transparent. By switching the working state of the electrically controlled atomizing film, the detection area of the infrared sensor can be changed. In this way, the detection area of the infrared sensor is flexible and changeable, and the operation is simple, and it can match the recording range of the camera, meeting the monitoring flexibility requirements of the monitoring device.
[0026] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without creative work. Among them:
[0028] Figure 1 It is one of the structural schematic diagrams of the infrared sensor of certain embodiments of the present application;
[0029] Figure 2 is a schematic diagram of a module of a monitoring device according to some embodiments of the present application;
[0030] Figure 3 is a schematic diagram of light propagation when the electrically controlled atomizing film of certain embodiments of the present application is in an atomized state;
[0031] Figure 4 It is a schematic diagram of light propagation when the electrically controlled atomizing film of certain embodiments of the present application is in a transparent state;
[0032] Figure 5 This is the second structural schematic diagram of the infrared sensor of certain embodiments of the present application;
[0033] Figure 6 It is one of the schematic diagrams of the detection area of the infrared sensor in some embodiments of the present application;
[0034] Figure 7 This is the second schematic diagram of the detection area of the infrared sensor in some embodiments of the present application;
[0035] Figure 8 This is the third schematic diagram of the detection area of the infrared sensor in some embodiments of the present application;
[0036] Fig. 9 This is the fourth schematic diagram of the detection area of the infrared sensor in certain embodiments of the present application.
[0037] Description of reference numerals:
[0038] Infrared sensor 100, lens 10, pyroelectric sensor 20, signal processing circuit 30, electrically controlled atomizing film 40, first glass layer 41, liquid crystal film layer 42, polymer 421, liquid crystal 422, conductive film layer 423, second glass layer 43, first film 44, second film 45, control unit 50, control harness 60, camera 200, monitoring device 1000. DETAILED DESCRIPTION
[0039] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.
[0040] PIR has a wide range of applications in security, lighting and other fields due to its low power consumption and cost advantages. For example, in smart buildings, PIR is deployed in corridors or hallways. When someone passes by, the lights are turned on and turned off after leaving. In this application scenario, camera-based video analysis technology can also be realized to a certain extent, but the camera needs to continuously collect images and process them. The power consumption of both camera image collection and image processing analysis exceeds that of the lighting itself. In addition, the video analysis method is easily affected by light and shadow and produces false alarms, while PIR uses a method based on infrared radiation to directly detect changes in infrared radiation with a wavelength of about 10μm (corresponding to the normal body temperature range of the human body), which is not affected by light and shadow in the visible light range and has better robustness.
[0041] In addition, in the field of security, especially when using battery-powered products such as hunting cameras, video doorbells and other monitoring equipment, in addition to higher requirements for low power consumption, more attention is paid to whether the movement of people or animals can be detected in time. The motion detection trigger mechanism based on video analysis is more susceptible to false alarms, such as the swing of branches, thereby triggering subsequent actions such as storage and remote alarms, further increasing system power consumption. Compared with the method based on video analysis, PIR has significant advantages.
[0042] Therefore, in practical applications, PIR can be used to detect the movement of people or animals, and the camera can be "wake up" according to the detection results to ensure that the monitoring equipment has low power consumption and does not lose important video information. In this case, ensuring that the detection area of the PIR is consistent with the recording range of the camera is of great significance to reducing system power consumption and improving detection accuracy.
[0043] In monitoring equipment, camera zoom or pan / tilt rotation will change the camera's recording range, but the detection area of the PIR on the camera is fixed, which results in the PIR detection area not matching the camera's recording range and failing to meet the flexibility requirements of monitoring equipment.
[0044] For example, in a camera zoom scenario, for a zoom camera, its recording range will change as the focal length of the camera lens changes. To obtain a wider recording field of view, the camera uses a short-focus lens to obtain a wide-angle image. When an abnormality is found, it is adjusted to a long-focus lens to obtain a long-focus image with a narrower field of view, thereby obtaining local details. When the camera's recording range changes, the detection area of the PIR on the camera is fixed, and the detection area of the PIR does not match the camera's recording range. For another example, in a camera pan / tilt rotation scenario, the camera's recording range changes, while the detection area of the PIR is fixed, which also causes the detection area of the PIR to not match the camera's recording range.
[0045] When the detection area of the PIR is larger than the recording range of the camera, the target can be detected, but it may not be captured by the camera, and the captured video may be meaningless. When the detection area of the PIR is smaller than the recording range of the camera, when a target appears at the edge of the recording range of the camera, the PIR may not be able to detect it in time and wake up the camera in time, resulting in missing very critical scene recording.
[0046] To solve the above technical problems, please refer to Figure 1 and Figure 2 , an embodiment of the present application provides an infrared sensor 100. The infrared sensor 100 includes a lens 10, a pyroelectric sensor 20 and a signal processing circuit 30. The lens 10 is used to receive an external infrared radiation signal, amplify the infrared radiation signal, and converge it to the pyroelectric sensor 20. The pyroelectric sensor 20 is used to generate an electrical signal based on the infrared radiation signal. The signal processing circuit 30 is connected to the pyroelectric sensor 20, and is used to perform signal processing on the electrical signal. The infrared sensor 100 also includes an electrically controlled atomizing film 40, which is disposed on the lens 10. The electrically controlled atomizing film 40 has two working states: atomizing and transparent. When the working state of the electrically controlled atomizing film 40 is switched, the detection area of the infrared sensor 100 changes.
[0047] In the infrared sensor 100 of the embodiment of the present application, an electrically controlled atomizing film 40 is provided on the lens 10. The electrically controlled atomizing film 40 has two working states, atomizing and transparent. By switching the working state of the electrically controlled atomizing film 40, the detection area of the infrared sensor 100 can be changed. In this way, the detection area of the infrared sensor 100 is flexible and easy to operate, and can be matched with the recording range of the camera 200, meeting the monitoring flexibility requirements of the monitoring device 1000.
[0048] Specifically, the infrared sensor 100 may be a passive infrared sensor. The infrared sensor 100 is used to detect infrared signals. When the infrared sensor 100 is applied to the monitoring device 1000, the infrared sensor 100 may be used to detect infrared radiation signals to determine whether a person passes through the detection area.
[0049] The infrared sensor 100 includes a lens 10, a pyroelectric sensor 20 and a signal processing circuit 30. The lens 10 is used to receive external infrared radiation signals. The infrared radiation signals are relatively weak. The infrared radiation signals can be amplified by the lens 10 and converged to the surface of the pyroelectric sensor 20. The pyroelectric sensor 20 can sense infrared radiation signals of a specific wavelength (about 10 μm) emitted by the human body. When the human body moves within the monitoring range, the emission position of the infrared radiation signal will change, causing the charge on the pyroelectric sensor 20 to lose balance, and then the pyroelectric effect occurs, that is, the charge is released outward. In this process, the changes in the infrared radiation signal are converted into electrical signals and then transmitted to the signal processing circuit 30.
[0050] The electrical signal output by the pyroelectric sensor 20 is relatively weak, so the signal processing circuit 30 can amplify the electrical signal. Of course, the signal processing circuit 30 can also filter, delay, and other processes on the electrical signal, which are not limited here. Based on the processed electrical signal, it can be determined whether someone has passed through the detection area. For example, when the electrical signal is greater than a preset threshold, it is determined that someone has passed through the detection area.
[0051] The infrared sensor 100 further includes an electrically controlled atomizing film 40, which is disposed on the lens 10, and specifically can be attached or adsorbed on the lens 10. The electrically controlled atomizing film 40 has two working states: atomized and transparent. When the electrically controlled atomizing film 40 is in the atomized state, the infrared radiation signal is blocked from converging to the pyroelectric sensor 20. When the electrically controlled atomizing film 40 is in the transparent state, the infrared radiation signal can converge to the pyroelectric sensor 20. Therefore, when the working state of the electrically controlled atomizing film 40 is switched, the detection area of the infrared sensor 100 will change.
[0052] In the related art, when infrared sensors are applied to monitoring equipment, in order to match the recording range of the camera, when the recording range of the camera changes, the detection area of the infrared sensor can only be changed by manually replacing the lens or replacing the entire infrared sensor, which is complicated to operate and not very flexible.
[0053] In the embodiment of the present application, an electrically controlled atomizing film 40 is provided on the lens 10. The electrically controlled atomizing film 40 has two working states: atomizing and transparent. By switching the working state of the electrically controlled atomizing film 40, the detection area of the infrared sensor 100 can be changed. In this way, the detection area of the infrared sensor 100 is flexible and easy to operate, and can be matched with the recording range of the camera 200, meeting the monitoring flexibility requirements of the monitoring device 1000.
[0054] See also Figure 1 In some embodiments, the lens 10, the pyroelectric sensor 20 and the signal processing circuit 30 are arranged from the outside to the inside.
[0055] Specifically, the lens 10, the pyroelectric sensor 20 and the signal processing circuit 30 are arranged from outside to inside, so that the lens 10 can receive the infrared radiation signal outside the infrared sensor 100, amplify the infrared radiation signal, and then converge it to the pyroelectric sensor 20. The pyroelectric sensor 20 generates an electrical signal according to the infrared radiation signal, and then transmits it to the signal processing circuit 30 to perform signal processing on the electrical signal.
[0056] See also Figure 1 In some embodiments, the lens 10 includes an inner surface and an outer surface facing each other, and the outer surface faces the outside of the infrared sensor 100. The electrically controlled atomizing film 40 is attached to the inner surface; or the electrically controlled atomizing film 40 is attached to the outer surface.
[0057] Specifically, the lens 10 includes an inner surface and an outer surface facing each other, the outer surface faces the outside of the infrared sensor 100, and the inner surface faces the pyroelectric sensor 20. The electrically controlled atomizing film 40 can be attached to the inner surface of the lens 10, that is, the electrically controlled atomizing film 40 is located between the lens 10 and the pyroelectric sensor 20. When the electrically controlled atomizing film 40 is in an atomized state, the lens 10 can receive external infrared radiation signals, but the infrared radiation signals are blocked by the electrically controlled atomizing film 40 and cannot be gathered to the pyroelectric sensor 20.
[0058] The electrically controlled atomizing film 40 can also be attached to the outer surface of the lens 10. When the electrically controlled atomizing film 40 is in an atomized state, the lens 10 cannot receive external infrared radiation signals, and thus the infrared radiation signals cannot converge to the pyroelectric sensor 20. It can be seen that no matter whether the electrically controlled atomizing film 40 is attached to the inner surface or the outer surface of the lens 10, when the electrically controlled atomizing film 40 is in an atomized state, it can block the infrared radiation signals from converging to the pyroelectric sensor 20.
[0059] See also Figure 1 , Figure 3 and Figure 4 In some embodiments, the electrically controlled atomizing film 40 includes a first glass layer 41, a liquid crystal film layer 42, and a second glass layer 43, wherein the liquid crystal film layer 42 is located between the first glass layer 41 and the second glass layer 43. When the power-on state of the electrically controlled atomizing film 40 changes, the refractive index of the liquid crystal film layer 42 changes, so that the working state of the electrically controlled atomizing film 40 is switched.
[0060] Specifically, the electrically controlled atomizing film 40 is integrally formed after being glued together by a special process, and is a new type of special photoelectric glass with a laminated structure. The electrically controlled atomizing film 40 includes a first glass layer 41, a liquid crystal film layer 42, and a second glass layer 43. The liquid crystal film layer 42 can be made of polymer dispersed liquid crystal (PDLC), and the liquid crystal film layer 42 is solidified between the first glass layer 41 and the second glass layer 43.
[0061] The electrically controlled atomizing film 40 may further include a first film 44 and a second film 45. The first film 44 is located between the liquid crystal film layer 42 and the first glass layer 41, and is used to glue the liquid crystal film layer 42 to the first glass layer 41. The second film 45 is located between the liquid crystal film layer 42 and the second glass layer 43, and is used to glue the liquid crystal film layer 42 to the second glass layer 43. The first film 44 and the second film 45 may be made of ethylene vinyl acetate copolymer (EVA).
[0062] The working state of the electrically controlled atomizing film 40 is related to the power-on state of the electrically controlled atomizing film 40 . When the power-on state of the electrically controlled atomizing film 40 changes, the refractive index of the liquid crystal film layer 42 changes, so that the working state of the electrically controlled atomizing film 40 switches.
[0063] See also Figure 3 and Figure 4In some embodiments, the liquid crystal film layer 42 includes a polymer 421 and a liquid crystal 422 disposed in the polymer 421. When the electrically controlled atomizing film 40 is not powered, the refractive index of the liquid crystal 422 is less than the refractive index of the polymer 421, and the electrically controlled atomizing film 40 is in an atomized state. When the electrically controlled atomizing film 40 is powered, the refractive index of the liquid crystal 422 is equal to the refractive index of the polymer 421, and the electrically controlled atomizing film 40 is in a transparent state.
[0064] Specifically, the liquid crystal film layer 42 includes a polymer 421 and a liquid crystal 422 disposed in the polymer 421. The liquid crystal film layer 42 may further include a conductive film layer 423, and the conductive film layer 423 is used for conducting electricity. The conductive film layer 423 may be two layers, and the polymer 421 and the liquid crystal 422 are located between the two layers of the conductive film layer 423. The conductive film layer 423 may be an indium tin oxide-polyethylene terephthalate (ITO-PET) film.
[0065] like Figure 3 As shown, when the electrically controlled atomizing film 40 is not powered, the liquid crystals 422 are arranged irregularly, the refractive index of the liquid crystals 422 is less than that of the polymer 421, the incident light is scattered at the polymer 421, and the electrically controlled atomizing film 40 is milky white, that is, it is in an atomized state.
[0066] like Figure 4 As shown, when the electrically controlled atomizing film 40 is powered on, the liquid crystal 422 quickly changes from an irregular arrangement to a directional regular arrangement, the refractive index of the liquid crystal 422 is equal to the refractive index of the polymer 421, the incident light can completely pass through the liquid crystal film layer 42, and the electrically controlled atomizing film 40 is in a transparent state.
[0067] See also Figure 1 In some embodiments, the lens 10 includes a plurality of connected sub-lenses, each of which is used to receive infrared radiation signals from a corresponding solid angle space. The shape of the sub-lenses can be a polygon such as a quadrilateral, a pentagon, or a hexagon, which can be flexibly set in specific implementation.
[0068] Specifically, the lens 10 includes a plurality of connected sub-lenses, such as Figure 1 As shown, each sub-lens is hexagonal, and a plurality of sub-lenses are connected to form a lens 10. Each sub-lens can receive an infrared radiation signal from a corresponding solid angle space.
[0069] See also Figure 1 In some embodiments, the sub-lens is a Fresnel lens.
[0070] Specifically, the Fresnel lens has excellent optical performance and low manufacturing cost. By using the Fresnel lens as the sub-lens, the cost of the infrared sensor 100 can be reduced while ensuring the detection reliability of the infrared sensor 100. Of course, in other embodiments, the sub-lens can also be other lenses.
[0071] See also Figure 1 In some embodiments, the electrically controlled atomizing film 40 includes a plurality of sub-films, each of which corresponds to a plurality of sub-lenses, and each sub-film is disposed on a corresponding sub-lens.
[0072] Specifically, the electrically controlled atomizing film 40 can be cut into a plurality of sub-films, each of which corresponds to a plurality of sub-lenses, that is, each sub-film matches the shape and size of a corresponding sub-lens. Each sub-film is attached to a corresponding sub-lens, and when the sub-film is in an atomized state, it can block the corresponding sub-lens from converging the infrared radiation signal of the corresponding solid angle space to the pyroelectric sensor 20.
[0073] See also Figure 1 and Figure 5 In some embodiments, the infrared sensor 100 further includes a control unit 50 and a control harness 60, wherein the control unit 50 is connected to the control harness 60, and the control harness 60 is connected to a plurality of sub-films for controlling the working states of the plurality of sub-films.
[0074] Specifically, the control unit 50 is connected to the control harness 60, and the control harness 60 is connected to the plurality of sub-films. The control unit 50 is used to output a control signal to the control harness 60, so as to control the working states of the plurality of sub-films through the control harness 60. For example, when the camera 200 changes the video recording range by zooming, the control unit 50 receives a control command about the detection area of the infrared sensor 100, and sends a control signal to the control harness 60. The control harness 60 transmits the control signal to the plurality of sub-films, controls the working states of the plurality of sub-films, and thus changes the detection area of the infrared sensor 100.
[0075] When the camera 200 is in the wide-angle mode, the working states of the plurality of sub-films are as follows: Figure 6 As shown, the plurality of sub-films are all in a transparent state. When the camera 200 is in a medium focal length mode, the working states of the plurality of sub-films are as follows Figure 7 As shown, the plurality of sub-films in the outer circle are in a fogged state, and the remaining plurality of sub-films are in a transparent state, and the detection area of the infrared sensor 100 is reduced. When the camera 200 is in a narrow angle range, the working states of the plurality of sub-films are as follows: Figure 8 As shown, the central sub-film is in a transparent state, and the other multiple sub-films are in a fogged state, and the detection area of the infrared sensor 100 is further reduced.
[0076] In addition, when the camera 200 changes the recording range by rotating the pan / tilt, the infrared sensor 100 of the embodiment of the present application can also control the working state of the sub-films in different areas so that the center of the detection area is shifted to one side. For example, when the camera 200 is in the medium focus mode and the recording range is changed by rotating the pan / tilt to the left, the working states of the multiple sub-films are as follows: Fig. 9 As shown, a portion of the sub-films with the center biased to the left is in a transparent state, and the remaining multiple sub-films are in a fogged state. The detection area of the infrared sensor 100 is reduced, and the center of the detection area is shifted to the left.
[0077] It should be noted that the working states of the sub-films corresponding to the various recording ranges of the camera 200 can be pre-set by programming. When the monitoring device 1000 is working, the control unit 50 outputs a control signal of the working state of the corresponding sub-film according to the recording range of the camera 200, and controls the multiple sub-films to be in the corresponding working state, so that the detection area of the infrared sensor 100 matches the recording range of the camera 200.
[0078] See also Figure 1 and Figure 5 In some embodiments, there are multiple control harnesses 60. Each control harness 60 is connected to a sub-film to control the working state of a corresponding sub-film; or each control harness 60 is connected to multiple sub-films to control the working states of multiple corresponding sub-films.
[0079] Specifically, there are multiple control harnesses 60, each of which can be connected to a sub-film to control the working state of the corresponding sub-film. Each control harness 60 can be connected to multiple sub-films at the same time to control the working states of the corresponding multiple sub-films at the same time. Figure 7 As shown, a control harness 60 can be connected to multiple sub-films in a full circle on the periphery to control the simultaneous atomization of multiple sub-films.
[0080] See also Figure 1 and Figure 5 In some embodiments, the control harness 60 is fixed at the joints between the plurality of sub-lenses and converges to the side of the pyroelectric sensor 20 facing away from the lens 10 .
[0081] Specifically, the control harness 60 is fixed at the joints between the plurality of sub-lenses and converges to the side of the pyroelectric sensor 20 facing away from the lens 10, and the control harness 60 does not pass through the infrared radiation signal propagation path between the lens 10 and the pyroelectric sensor 20. In this way, the influence on the convergence of the infrared radiation signal can be avoided.
[0082] See also Figure 2The embodiment of the present application further provides a monitoring device 1000. The monitoring device 1000 includes a camera 200 and an infrared sensor 100 of any of the above embodiments, and the infrared sensor 100 is disposed on the camera 200.
[0083] Specifically, the monitoring device 1000 includes a camera 200 and an infrared sensor 100. The camera 200 is used for recording video. The infrared sensor 100 is arranged on the camera 200 to detect the movement of a person or an animal, and when the movement is detected, the camera 200 is awakened to record video. The detection area of the infrared sensor 100 matches the recording range of the camera 200. In this way, the monitoring flexibility requirements of the monitoring device 1000 can be met.
[0084] In summary, in the infrared sensor 100 and the monitoring device 1000 of the embodiment of the present application, the lens 10 is provided with an electrically controlled atomizing film 40, and the electrically controlled atomizing film 40 has two working states, atomizing and transparent. By switching the working state of the electrically controlled atomizing film 40, the detection area of the infrared sensor 100 can be changed. In this way, the detection area of the infrared sensor 100 is flexible and changeable, and the operation is simple, and it can match the recording range of the camera 200, meeting the monitoring flexibility requirements of the monitoring device 1000.
[0085] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.
[0086] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0087] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.
[0088] The disclosure above provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described above. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides various specific processes and examples of materials, but those of ordinary skill in the art can appreciate the application of other processes and / or the use of other materials.
[0089] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "example", "specific example", "some examples", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.
[0090] Although the embodiments of the present application have been shown and described above, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.
Claims
1. An infrared sensor, characterized in that: including a lens, a pyroelectric sensor and a signal processing circuit; The lens is used to receive external infrared radiation signals, amplify the infrared radiation signals, and converge them to the pyroelectric sensor; The pyroelectric sensor is used to generate an electrical signal according to the infrared radiation signal; The signal processing circuit is connected to the pyroelectric sensor and is used to perform signal processing on the electrical signal; The infrared sensor also includes an electrically controlled atomizing film, which is arranged on the lens. The electrically controlled atomizing film has two working states: atomizing and transparent. When the working state of the electrically controlled atomizing film is switched, the detection area of the infrared sensor changes.
2. The infrared sensor according to claim 1, characterized in that: The lens comprises an inner surface and an outer surface facing each other, and the outer surface faces the outside of the infrared sensor; The electrically controlled atomizing film is attached to the inner surface; or The electrically controlled atomizing film is attached to the outer surface.
3. The infrared sensor according to claim 1, characterized in that: The electrically controlled atomizing film comprises a first glass layer, a liquid crystal film layer and a second glass layer, wherein the liquid crystal film layer is located between the first glass layer and the second glass layer; When the power-on state of the electrically controlled atomizing film changes, the refractive index of the liquid crystal film layer changes, so that the working state of the electrically controlled atomizing film is switched.
4. The infrared sensor according to claim 3, characterized in that: The liquid crystal film layer includes a polymer and a liquid crystal disposed in the polymer; When the electrically controlled atomizing film is not powered, the refractive index of the liquid crystal is less than the refractive index of the polymer, and the electrically controlled atomizing film is in an atomized state; When the electrically controlled atomizing film is powered on, the refractive index of the liquid crystal is equal to the refractive index of the polymer, and the electrically controlled atomizing film is in a transparent state.
5. The infrared sensor according to claim 1, characterized in that: The lens includes a plurality of connected sub-lenses, and each of the sub-lenses is used for receiving the infrared radiation signal from a corresponding solid angle space.
6. The infrared sensor according to claim 5, characterized in that: The electrically controlled atomizing film includes a plurality of sub-films, each of which corresponds to a plurality of sub-lenses, and each of the sub-films is disposed on a corresponding sub-lens.
7. The infrared sensor according to claim 6, characterized in that: The infrared sensor further comprises a control unit and a control harness, wherein the control unit is connected to the control harness, and the control harness is connected to the plurality of sub-films for controlling the working states of the plurality of sub-films.
8. The infrared sensor according to claim 7, characterized in that: The number of the control harnesses is multiple; Each of the control harnesses is connected to one of the sub-films, respectively, and is used to control the working state of the corresponding sub-film; or Each of the control harnesses is connected to a plurality of the sub-films at the same time, and is used to simultaneously control the working states of the corresponding plurality of the sub-films.
9. The infrared sensor according to claim 7, characterized in that: The control harness is fixed at the joints between the plurality of sub-lenses and converges to a side of the pyroelectric sensor facing away from the lens.
10. A monitoring device, characterized in that: The monitoring device comprises a camera and the infrared sensor according to any one of claims 1 to 9.