CN108513611B - Infrared detector and infrared detection method - Google Patents
Infrared detector and infrared detection method Download PDFInfo
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- CN108513611B CN108513611B CN201780004705.2A CN201780004705A CN108513611B CN 108513611 B CN108513611 B CN 108513611B CN 201780004705 A CN201780004705 A CN 201780004705A CN 108513611 B CN108513611 B CN 108513611B
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- 238000001514 detection method Methods 0.000 title claims abstract description 116
- 230000007246 mechanism Effects 0.000 claims abstract description 36
- 230000003068 static effect Effects 0.000 claims abstract description 16
- 230000005855 radiation Effects 0.000 claims description 13
- 230000008859 change Effects 0.000 claims description 12
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/10—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors
- G01J5/34—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors using capacitors, e.g. pyroelectric capacitors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/10—Detecting, e.g. by using light barriers
- G01V8/20—Detecting, e.g. by using light barriers using multiple transmitters or receivers
Abstract
An infrared detector (1) includes a first infrared sensor (11), a lens (12) covering a part of sensing pixels of the first infrared sensor (11), a driving mechanism (13) for driving the first infrared sensor (11) and the lens (12) to move together, and a control mechanism (14) for controlling the driving mechanism (13) to be turned on or kept off based on a current infrared detection signal. The infrared detection method comprises the following steps: generating a current infrared detection signal; and determining whether to start the first infrared sensor (11) and a lens (12) covering part of sensing pixels of the infrared sensor (11) to move together based on the current infrared detection signal, and if so, performing infrared detection by using the moving first infrared sensor (11). By adopting the infrared detector (1) and the infrared detection method, whether static people exist in a detection area can be effectively monitored, the false detection or missing detection rate is low, and the structure is simple.
Description
Technical Field
The invention relates to the field of detectors, in particular to an infrared detector and an infrared detection method.
Background
Currently, in the field of infrared detection, a pyroelectric infrared probe cannot identify a human body in a static state, and therefore, if the probe is used in actual detection, the static human body is easily ignored, and missed detection or false detection is caused.
Disclosure of Invention
The invention aims to solve the technical problem of providing an infrared detector and an infrared detection method aiming at the defect that a static human body is difficult to detect in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: an infrared detector is provided, which includes a first infrared sensor, a lens covering a part of sensing pixels of the first infrared sensor, a driving mechanism for driving the first infrared sensor and the lens to move together, and a control mechanism for controlling the driving mechanism to be turned on or kept off based on a current infrared detection signal.
Preferably, the first infrared sensor generates a current infrared detection signal in a stationary state.
Preferably, the infrared detector further includes a second infrared sensor adjacent to the first infrared sensor, the second infrared sensor generating a current infrared detection signal in a stationary state.
Preferably, the controlling of the driving mechanism to be turned on or off based on the current infrared detection signal includes: if the current infrared detection signal changes along with the time, controlling the driving mechanism to keep closing; and if the current infrared detection signal does not change along with the time, controlling the driving mechanism to be started.
Preferably, the movement comprises translation and/or rotation.
Preferably, the drive mechanism comprises a stepper motor.
The invention also provides an infrared detection method, which comprises the following steps:
generating a current infrared detection signal; and
and determining whether to start the first infrared sensor and a lens covering part of sensing pixels of the infrared sensor to start moving together based on the current infrared detection signal, and if so, performing infrared detection by adopting the moving first infrared sensor.
Preferably, generating the current infrared detection signal comprises: and generating a current infrared detection signal by adopting the infrared sensor in a static state.
Preferably, the determining whether to activate the first infrared sensor and the lens covering the partial sensing pixels of the infrared sensor to start moving together based on the current infrared detection signal includes: if the current infrared detection signal changes along with the time, keeping the first infrared sensor static; and if the current infrared detection signal does not change along with the time, starting the first infrared sensor and the lens to move together.
Preferably, the infrared detection with the moving first infrared sensor comprises: if the infrared detection signal generated by the moving first infrared sensor changes along with the time, determining that a static person exists in the infrared detection area; and if the infrared detection signal does not change along with the time, determining that no person exists in the infrared detection area.
The implementation of the invention has the following beneficial effects: by adopting the infrared detector and the infrared detection method, whether static people exist in a detection area can be effectively monitored, the false detection or missing detection rate is low, and the structure is simple.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic structural view of an infrared detector according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of an infrared detector according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, which shows a schematic structural diagram of an infrared detector 1 according to a first embodiment of the present invention, the infrared detector 1 includes a first infrared sensor 11, a lens 12 covering a part of sensing pixels of the first infrared sensor 11, a driving mechanism 13 for driving the first infrared sensor 11 and the lens 12 to move together, and a control mechanism 14 for controlling the driving mechanism 13 to be turned on or kept off based on a current infrared detection signal.
Specifically, the infrared sensor 11 may be a pyroelectric infrared sensor that acquires infrared radiation and generates an infrared detection signal, and the first infrared sensor 11 may generate the above-described current infrared detection signal in a stationary state. The lens 12 may be a spherical lens or any other suitable lens, the lens 12 covers only a part of the sensing pixels of the first infrared sensor 11, for example, the lens 12 may cover at least one pixel, or the lens 12 may cover only one pixel, and the first infrared sensor 11 and the lens 12 may both be fixed on the substrate 10, and during the movement process, the three move together.
The driving mechanism 13 may be a stepping motor, and may drive the first infrared sensor 11 and the lens 12 to move together, the movement including translation, rotation, or a combination of translation and rotation, for example, fig. 1 shows that the first infrared sensor 11 rotates together with the lens 12 in the direction of the arrow. The driving mechanism 13 may also drive the first infrared sensor 11 and the lens 12 to move together repeatedly a plurality of times, for example, to translate repeatedly; or repeatedly rotated clockwise by an angle (e.g., 180 degrees) and then counterclockwise, and so on. This repetitive movement is advantageous for improving the detection accuracy.
The control mechanism 14 is electrically connected or communicatively connected to the first infrared sensor 11, and receives the infrared detection signal generated by the infrared sensor 11, for example, may obtain the current infrared detection signal generated by the first infrared sensor 11. The control mechanism 14 is also electrically or communicatively connected to the driving mechanism 13, and can control the driving mechanism 13 to be turned on or kept off based on the current infrared detection signal. For example, if the control mechanism 14 determines that the current infrared detection signal changes with time, the control mechanism 13 is kept off, that is, the first infrared sensor 11 and the lens 12 are kept still together; if the current infrared detection signal is judged not to change along with the time, the driving mechanism 13 is controlled to be started so as to drive the first infrared sensor 11 and the lens 12 to move together.
It is known that when the current infrared detection signal changes with time, it can be considered that a moving person is present in the detection area; if the current infrared detection signal does not change with time, it cannot be determined whether no person or a human body is in a static state in the detection area. Thus, the first infrared sensor 11 and the lens 12 can be driven to move together for discrimination when the current infrared detection signal does not change with time. Only part of the sensing pixels of the first infrared sensor 11 is covered by the lens 12, so that part of the infrared radiation received by the first infrared sensor 11 passes through the lens 12 and part does not pass through the lens 12. During the movement of the two together, the infrared radiation passing through the lens 12 comes from different detection areas over time. If there is a stationary human body in the detection area, during the movement, the portion of the infrared radiation of the human body passing through the lens 12 changes with time, and the first infrared sensor 11 and the lens 12 are relatively stationary, so that the infrared radiation acquired by the first infrared sensor 11 changes with time, and it can be determined that there is a stationary human body in the detection area. If the detection area is free of people, the infrared radiation acquired by the first infrared sensor 11 is constant over time. By adopting the infrared detector 1, whether a static person exists in a detection area can be effectively monitored, the false detection or missing detection rate is low, and the structure is simple.
Referring to fig. 2, which shows a schematic structural diagram of an infrared detector 2 according to a second embodiment of the present invention, like the infrared detector 1 of the first embodiment, the infrared detector 2 also includes a first infrared sensor, a first lens 221 covering a part of sensing pixels of the first infrared sensor 211, a driving mechanism 23 for driving the first infrared sensor 211 and the first lens 221 to move together, and a control mechanism 24 for controlling the driving mechanism 23 to be turned on or kept off based on a current infrared detection signal. Unlike the infrared detector of the first embodiment, the infrared detector further includes a second infrared sensor 212, a second lens that covers all sensing pixels of the second infrared sensor 212, and the second infrared sensor 212 is kept still throughout the detection process and generates the above-mentioned current infrared detection signal in a still state. The first and second infrared sensors are fixedly provided on the substrates 201 and 202, respectively, together with the respective lenses.
The control mechanism firstly controls the driving mechanism to keep closed, the first sensor and the second sensor are both in a static state, and infrared radiation received by the second sensor is used for detection. In the process, the second sensor receives the infrared radiation of the infrared detection area and generates the current infrared detection signal. If the control mechanism judges that the current infrared detection signal changes along with the time, the situation that a moving person appears in the detection area can be considered; if the current infrared detection signal is judged not to change along with the time, the driving mechanism is started to drive the first infrared sensor and the first lens to move together, and the infrared radiation received by the first sensor is adopted for detection so as to discriminate whether the detection area is unmanned or static. In this embodiment, a stationary second sensor is generally used for detection, the first sensor is kept stationary, and the first sensor is activated only when it cannot be determined whether the detection area is empty or a stationary person, so that the movement time of the first sensor can be reduced, and accordingly, the energy consumption and the noise can be reduced.
A third embodiment of the present invention relates to an infrared detection method, including: s100, generating a current infrared detection signal; and step S200, determining whether to start the first infrared sensor and a lens covering part of sensing pixels of the infrared sensor to move together based on the current infrared detection signal, and if so, performing infrared detection by adopting the moving first infrared sensor.
Specifically, in step S100, the infrared sensor in the stationary state is used to generate the current infrared detection signal. For example, the infrared detection signal may be generated by the first infrared sensor in a stationary state, or may be generated by an infrared sensor other than the first infrared sensor in a stationary state.
In step S200, if the current infrared detection signal changes with time, the first infrared sensor is kept stationary; and if the current infrared detection signal does not change along with the time, starting the first infrared sensor and the lens to move together, and detecting by adopting the moving first infrared sensor. If the infrared detection signal generated by the moving first infrared sensor changes along with the time, determining that a static person exists in the infrared detection area; and if the infrared detection signal does not change along with the time, determining that no person exists in the infrared detection area.
It should be understood that the infrared detector in the present invention corresponds to the infrared detection method, the infrared detector can implement the corresponding infrared detection method, and the technical details of the infrared detector can be partially or fully referred to in the explanation of the infrared detection method, so that further details of the infrared detection method are not described herein.
It is to be understood that the foregoing examples, while indicating the preferred embodiments of the invention, are given by way of illustration and description, and are not to be construed as limiting the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (10)
1. An infrared detector is characterized by comprising a first infrared sensor, a lens covering part of sensing pixels of the first infrared sensor, a driving mechanism for driving the first infrared sensor and the lens to move together, and a control mechanism for controlling the driving mechanism to be opened or kept closed based on a current infrared detection signal;
wherein the first infrared sensor partial sensing pixels are covered by the lens such that the first infrared sensor receives and generates the infrared detection signal according to a portion of infrared radiation passing through the lens and a portion of infrared radiation not passing through the lens.
2. The infrared detector as set forth in claim 1, wherein the first infrared sensor generates the current infrared detection signal in a stationary state.
3. The infrared detector of claim 1, further comprising a second infrared sensor adjacent to the first infrared sensor, the second infrared sensor generating the current infrared detection signal in a quiescent state.
4. The infrared detector as set forth in claim 1, wherein the controlling the driving mechanism to be turned on or off based on the current infrared detection signal includes: if the current infrared detection signal changes along with time, controlling the driving mechanism to keep closing; and if the current infrared detection signal does not change along with the time, controlling the driving mechanism to be started.
5. Infrared detector according to claim 1, characterized in that the movement comprises a translation and/or a rotation.
6. The infrared detector as set forth in claim 1, wherein said drive mechanism comprises a stepper motor.
7. An infrared detection method, comprising:
generating a current infrared detection signal; and
determining whether a first infrared sensor and a lens covering part of sensing pixels of the infrared sensor start to move together based on the current infrared detection signal, and if so, performing infrared detection by using the moving first infrared sensor;
wherein the first infrared sensor partial sensing pixels are covered by the lens such that the first infrared sensor performs the infrared detection based on a portion of infrared radiation passing through the lens and a portion of infrared radiation not passing through the lens.
8. The infrared detection method of claim 7, wherein the generating a current infrared detection signal comprises: and generating the current infrared detection signal by adopting an infrared sensor in a static state.
9. The infrared detection method of claim 7, wherein the determining whether to activate the first infrared sensor to begin moving with a lens covering a portion of sensing pixels of the infrared sensor based on the current infrared detection signal comprises: if the current infrared detection signal changes along with the time, keeping the first infrared sensor static; and if the current infrared detection signal does not change along with the time, starting the first infrared sensor and the lens to move together.
10. The infrared detection method as set forth in claim 7, wherein the infrared detection using the first infrared sensor in motion includes: if the infrared detection signal generated by the moving first infrared sensor changes along with the time, determining that a static person exists in the infrared detection area; and if the infrared detection signal does not change along with the time, determining that no person exists in the infrared detection area.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2017/091708 WO2019006664A1 (en) | 2017-07-04 | 2017-07-04 | Infrared detector, and infrared detection method |
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| CN108513611A CN108513611A (en) | 2018-09-07 |
| CN108513611B true CN108513611B (en) | 2020-08-07 |
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| WO (1) | WO2019006664A1 (en) |
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| CN115633430A (en) * | 2021-07-16 | 2023-01-20 | 海宁优为电器科技有限公司 | Static human body induction device, illumination device, disinfection device and using method thereof |
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| CN102155995A (en) * | 2011-03-13 | 2011-08-17 | 刘瑜 | Infrared human body sensing device with all-around human body sensing capability |
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| WO2019006664A1 (en) | 2019-01-10 |
| CN108513611A (en) | 2018-09-07 |
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