CN111835330A - Existing pyroelectric infrared induction switch - Google Patents
Existing pyroelectric infrared induction switch Download PDFInfo
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- CN111835330A CN111835330A CN201910301325.6A CN201910301325A CN111835330A CN 111835330 A CN111835330 A CN 111835330A CN 201910301325 A CN201910301325 A CN 201910301325A CN 111835330 A CN111835330 A CN 111835330A
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- 230000001939 inductive effect Effects 0.000 claims description 9
- 230000003068 static effect Effects 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 description 17
- 238000010586 diagram Methods 0.000 description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 3
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- 101000903318 Homo sapiens Stress-70 protein, mitochondrial Proteins 0.000 description 1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/945—Proximity switches
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/28—Modifications for introducing a time delay before switching
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/941—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated using an optical detector
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/945—Proximity switches
- H03K2017/9455—Proximity switches constructional details
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Abstract
The invention discloses an existing pyroelectric infrared sensing switch which comprises a first pyroelectric infrared sensor and a second pyroelectric infrared sensor, wherein an infrared chopping modulation device is arranged in front of the second pyroelectric infrared sensor, a plurality of windows are arranged on the infrared chopping modulation device, the infrared chopping modulation device is connected with a driving mechanism, the driving mechanism can drive the infrared chopping modulation device to move, the second pyroelectric infrared sensor corresponds to the movement tracks of the windows, and the second pyroelectric infrared sensor and the first pyroelectric infrared sensor are electrically connected with the driving mechanism. After the first pyroelectric infrared sensor detects an infrared signal, the infrared chopping modulation device is started, and through the movement of the infrared chopping modulation device, the second pyroelectric infrared sensor can detect a pulsating infrared signal through a window, so that the pyroelectric infrared sensing switch can continuously work, and a human body entering the sensing range of the pyroelectric infrared sensor is in a static state.
Description
Technical Field
The invention relates to a pyroelectric infrared induction switch, in particular to an existing pyroelectric infrared induction switch.
Background
The pyroelectric infrared sensing switch is an automatic control switch based on an infrared sensing technology, the pyroelectric infrared sensor senses infrared heat of a human body to realize an automatic control function, various electrical equipment such as lamps, automatic doors and burglar alarms can be quickly opened, and great convenience is brought to daily work and life of people.
However, due to the physical characteristics of the pyroelectric infrared sensor and the design technology of the existing product, the existing pyroelectric infrared sensing switch has certain defects in use. When the pyroelectric infrared inductive switch detects the moving heat of a human body, only one time delay circuit is set on the circuit processing to keep the pyroelectric infrared inductive switch to have a certain working time. When a human body is still in front of the pyroelectric infrared sensor, the pyroelectric infrared sensing switch stops working after delay, and cannot keep the long-time working of the human body when the human body is still, so that great inconvenience is brought in actual application, for example, certain false judgment and false alarm can be caused on anti-theft alarm.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide the existing pyroelectric infrared sensing switch, which is used for carrying out infrared chopping modulation on human body infrared heat existing in a detection range, realizing active scanning of the human body infrared heat and ensuring that the pyroelectric infrared sensing switch can work for a long time until a human body leaves the detection range of the pyroelectric infrared sensor.
In order to achieve the purpose, the existing pyroelectric infrared sensing switch comprises a first pyroelectric infrared sensor and a second pyroelectric infrared sensor, wherein an infrared chopping modulation device is arranged in front of the second pyroelectric infrared sensor, a plurality of windows are arranged on the infrared chopping modulation device, the infrared chopping modulation device is connected with a driving mechanism, the driving mechanism can drive the infrared chopping modulation device to move, the second pyroelectric infrared sensor corresponds to the movement tracks of the windows, and the second pyroelectric infrared sensor and the first pyroelectric infrared sensor are electrically connected with the driving mechanism.
Preferably, the second pyroelectric infrared sensor corresponds to a movement track of the center of the window.
Preferably, the infrared chopping modulation device is a plate body, a plurality of windows are arranged on the plate body, centers of the windows are located on the same straight line, and the infrared chopping modulation device can do linear reciprocating motion relative to the second pyroelectric infrared sensor.
Preferably, the infrared chopping modulation device is a plate body, a plurality of windows are arranged on the plate body, the centers of the windows are located on the same circumference, and the infrared chopping modulation device can rotate relative to the second pyroelectric infrared sensor.
Preferably, the driving mechanism is a stepping motor.
Preferably, the first pyroelectric infrared sensor and the second pyroelectric infrared sensor are respectively located in different lenses, and the infrared chopping modulation device and the second pyroelectric infrared sensor are located in the same lens.
Compared with the prior art, the invention has the beneficial effects that: after the first pyroelectric infrared sensor detects an infrared signal of a human body, the infrared chopping modulation device is started to move, and through the movement of the infrared chopping modulation device, the second pyroelectric infrared sensor can detect a pulsating infrared signal through the window, so that the pyroelectric infrared sensing switch can continuously work, and even if the human body entering the detection range of the pyroelectric infrared sensor is in a static state or an unmovable state.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention.
Fig. 2 is another schematic structure of the present invention.
Fig. 3 is a schematic circuit diagram of a pyroelectric infrared sensor according to the present invention.
Fig. 4 is a schematic circuit diagram of an infrared carrier modulation device and a driving mechanism according to the present invention.
Fig. 5 is another circuit schematic diagram of the infrared carrier modulation device and the driving mechanism of the present invention.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
As shown in fig. 1 and 2, an existing pyroelectric infrared sensing switch includes a first pyroelectric infrared sensor 1, a second pyroelectric infrared sensor 2, and an infrared chopping modulation device, where the infrared chopping modulation device is located in front of the second pyroelectric infrared sensor 2 and can move relative to the second pyroelectric infrared sensor 2, the infrared chopping modulation device is provided with a plurality of windows 3, the second pyroelectric infrared sensor 2 is opposite to the movement tracks of the windows 3, and the infrared chopping modulation device does not block the first pyroelectric infrared sensor 1 in a moving state or a static state, so as to ensure an effective detection range of the first pyroelectric infrared sensor 1.
The first pyroelectric infrared sensor 1 and the second pyroelectric infrared sensor 2 are respectively positioned in two different lenses, and the infrared chopping modulation device and the second pyroelectric infrared sensor 2 are necessarily positioned in the same lens. The first pyroelectric infrared sensor 1 and the second pyroelectric infrared sensor 2 can be distributed transversely, also can be distributed vertically, also can be distributed at other angles, and the detection ranges of the first pyroelectric infrared sensor 1 and the second pyroelectric infrared sensor 2 are coincided.
In order to facilitate the movement of the infrared chopping modulation device, the infrared chopping modulation device is connected with a driving mechanism, and the driving mechanism is respectively and electrically connected with the first pyroelectric infrared sensor 1 and the second pyroelectric infrared sensor 2.
When a human body enters the detection range of the first pyroelectric infrared sensor 1, the first pyroelectric infrared sensor 1 sends an electric signal to a load and driving mechanism, the load works, the driving mechanism drives the infrared chopping modulation device to move, at the moment, the human body moves in the detection range of the first pyroelectric infrared sensor 1, the first pyroelectric infrared sensor 1 can always sense the infrared signal of the human body and keep the load working, meanwhile, the second pyroelectric infrared sensor 1 detects a pulsating infrared signal through the window 3 in the movement process of the infrared chopping modulation device and also sends an electric signal to the load and driving mechanism, in the process, the human body leaves out of the detection range of the first pyroelectric infrared sensor, the first pyroelectric infrared sensor 1 and the second pyroelectric infrared sensor 2 stop sending signals, and the load and the driving mechanism stop working, stopping the infrared chopping modulation device; when the human body is still in the detection range of the first pyroelectric infrared sensor 1, the first pyroelectric infrared sensor 1 starts the driving mechanism when detecting the infrared heat, and stops sending electric signals to the load and the driving mechanism after time delay, during the motion process corresponding to the time delay of the infrared chopping modulation device, because the second pyroelectric infrared sensor 2 is opposite to the motion trail of the window 3, the second pyroelectric infrared sensor 2 can detect pulsating infrared signals through the window 3, the second pyroelectric infrared sensor 2 sends electric signals to the driving mechanism and the load, the driving mechanism continues to drive the infrared chopping modulation device to continue moving, the load continues to work, and the driving mechanism and the load stop working until the second pyroelectric infrared sensor 2 and the first pyroelectric infrared sensor 1 do not detect infrared signals, and the next infrared signal is waited to enter.
First pyroelectric infrared sensor 1 is responsible for the start-up of actuating mechanism and load, and the window 3 cutting of infrared chopper modulation device enters into the infrared signal of second pyroelectric infrared sensor 2, makes second pyroelectric infrared sensor 2 carry out initiative scanning to the infrared signal of its detection range, even if the human body is in the motionless state, pulsated infrared signal still can be detected to second pyroelectric infrared sensor 2, has guaranteed the continuation work of load. The infrared chopping modulation device moves under the action of the driving mechanism, when the first pyroelectric infrared sensor and the second pyroelectric infrared sensor can not detect the infrared signal of a human body, the infrared chopping modulation device stops moving, the problem that the second pyroelectric infrared sensor does not correspond to a window is likely to occur, and the first pyroelectric infrared sensor 1 is responsible for starting the driving mechanism and a load and cannot influence the detection of the next infrared signal.
For better control of the movement of the infrared chopper modulation device, the drive mechanism is preferably a stepper motor.
The infrared chopping modulation device is a plate body which can be a square plate 4, as shown in fig. 1, a plurality of windows 3 which are uniformly distributed are arranged on the square plate 4, the centers of the windows 3 are positioned on the same straight line, the sizes of the windows 3 can be equal or unequal, and the infrared chopping modulation device can do linear reciprocating motion relative to the second pyroelectric infrared sensor 2.
The plate body may also be a disc 5, as shown in fig. 2, a plurality of windows 3 are provided on the disc 5, centers of the windows 3 are located on the same circumference, the windows 3 are uniformly distributed on the same circumference, and the infrared chopper modulation device can rotate relative to the second pyroelectric infrared sensor 2.
In order to ensure that the detection of the second pyroelectric infrared sensor 2 is not blocked, the second pyroelectric infrared sensor 2 is opposite to the movement track of the center of the window 3.
As shown in fig. 3, fig. 3 is a schematic circuit diagram of a first pyroelectric infrared sensor 1 and a second pyroelectric infrared sensor 2 in the present invention, wherein the first pyroelectric infrared sensor 1 and the second pyroelectric infrared sensor 2 are arranged in parallel, and the operation principle of the first pyroelectric infrared sensor 1 and the second pyroelectric infrared sensor 2 is the same as that of the prior art, and is not described herein again. As shown in fig. 4 and 5, fig. 4 and 5 are two schematic circuit diagrams of the infrared carrier modulation device and the driving mechanism in the present invention, and the port No. 1 in C4 in fig. 4 or the ports No. 1 and No. 4 in C4 in fig. 5 are electrically connected to the pin 6 OUT of the IC1 chip in fig. 3, and are used for inputting the infrared signals detected by the first pyroelectric infrared sensor 1 and the second pyroelectric infrared sensor 2.
The working principle of the existing pyroelectric infrared induction switch is as follows: when the pyroelectric infrared induction switch is powered on, the IC1 chip enters initialization, the IC1 chip outputs high level, the relay is attracted or the silicon controlled rectifier is turned on, the load works, and meanwhile, the driving mechanism works to drive the infrared chopping modulation device to move. When the IC1 chip is initialized, the IC1 chip outputs low level, the relay or the controlled silicon is powered off to stop supplying power to the load, meanwhile, the driving mechanism also stops working, the whole pyroelectric infrared induction switch enters a standby state, and the human body heat is waited to enter the detection range of the pyroelectric infrared sensor again.
When a human body enters the detection range of the pyroelectric infrared sensor, the first pyroelectric infrared sensor firstly detects the moving heat of the human body, at the moment, the first pyroelectric infrared sensor outputs low-frequency pulsating voltage to the IC1 chip, after the low-frequency pulsating voltage is processed by the amplification delay circuit, the IC1 chip outputs high level, a relay is attracted or a silicon controlled rectifier is opened to supply power to a load, simultaneously, the high level of the IC1 chip enables a driving mechanism to work to drive the infrared chopping modulation device to move so as to modulate the heat of the human body, the second pyroelectric infrared sensor outputs low-frequency pulsating voltage to the IC1 chip, the pulse frequency time output by the second pyroelectric infrared sensor to the IC1 chip is required to be ensured to be higher than the delay time, after the delay circuit, the IC1 chip keeps outputting high level, the relay keeps attracted or the silicon controlled rectifier to be opened so as to supply power to the load, and simultaneously, the high level enables the driving mechanism to drive the infrared chopping modulation device to continuously carry, the second pyroelectric infrared sensor can continuously output low-frequency pulsating voltage, and a closed-loop working mode is formed after the low-frequency pulsating voltage is processed by an IC1 chip circuit, so that the pyroelectric infrared sensing switch can keep working for a long time. When the human body heat leaves the detection area of the pyroelectric infrared sensor, the second pyroelectric infrared sensor stops outputting low-frequency pulsating voltage, the IC1 chip outputs low level after time delay, the relay or the controllable silicon is de-energized to stop supplying power to the load, meanwhile, the driving mechanism also stops working, and at the moment, the pyroelectric infrared sensing switch enters a standby state to wait for the next human body heat source to enter.
The operation of the present pyroelectric infrared sensing switch will be described in detail with reference to fig. 4 and fig. 3, wherein the port No. 1 in C4 in fig. 4 is electrically connected to the pin 6 OUT of the IC1 chip in fig. 3 for inputting the infrared signals detected by the first pyroelectric infrared sensor 1 and the second pyroelectric infrared sensor 2. When the AC alternating current is connected and the voltage is reduced, the power output DC12V and DC12V supply power to U1 and U2 and supply power to the IC3CPU driving chip. The DC12V outputs DC2.5V to power the IC1 chip and the first pyroelectric infrared sensor and the second pyroelectric infrared sensor after passing through U1, and the DC12V outputs DC5V to power the IC2CPU chip in FIG. 4 after passing through U2. At this time, the IC1 chip enters into operation initialization, the output high level of the pin 6 of the IC1 chip is connected to the base pull-In relay of Q1 through R7 to supply load operation, meanwhile, the pin 6 of the IC1 chip is connected to the base of Q2 through a diode D3 resistor R10, the collector of Q2 is connected with a resistor R9 to +5V, the collector of Q2 is inverted to low level because the base of Q2 is high level, and is connected to the pin (Pi In 2) 9 of the IC2CPU chip, and the pin 9 of the IC2CPU chip is low level. The (PoMOT 1) 2 pin of the IC2CPU chip is connected with the (Po MOT 1) 2 pin of the IC3CPU driving chip, the (PoMOT 2) 1 pin of the IC2CPU chip is connected with the (Po MOT 2) 3 pin of the IC3CPU driving chip, the (PoMOT 3) 14 pin of the IC2CPU chip is connected with the (PoMOT 3) 4 pin of the IC3CPU driving chip, the (PoMOT 4) 13 pin of the IC2CPU chip is connected with the (PoMOT 4) 5 pin of the IC3CPU driving chip, and the 9, 12, 13, 14 and 15 pins of the IC3CPU driving chip are connected with the stepping motor 6. When the pin 9 of the IC2CPU chip is set to be at low level, the IC3CPU driving chip can work, and at the moment, the stepping motor starts to drive the infrared chopper device to move together. When the work initialization of the IC1 chip is finished, the pin 6 of the IC1 chip outputs low level, and the Q1 releases the relay to stop supplying power to the load. Since the collector of Q2 flips high when pin 6 of the IC1 chip is low, pin 9 of the IC2CPU chip also goes high. Since the IC2CPU chip is set to low level, the IC3CPU driver chip can be operated. Therefore, when the pin 9 of the IC2CPU is at a high level, the IC3CPU driving chip stops working, the stepping motor 6 stops rotating, and the pyroelectric infrared inductive switch enters a standby state.
When human body infrared heat enters a detection working area of the pyroelectric infrared induction switch in a standby state, the first pyroelectric infrared sensor 1 detects the human body infrared heat when moving to enter in advance, the S pole of the first pyroelectric infrared sensor outputs low-frequency pulsating voltage to the pin 2 of the IC1 chip, the pin 6 of the IC1 chip outputs high level, and the high level is connected to a Q1 base electrode attracting relay through R7 to supply power to a load. Meanwhile, a pin 6 of the IC1 chip is connected to a base electrode of the Q2 through a diode D3 resistor R10, a collector electrode of the Q2 is turned over to be connected to a pin 9 of the IC2CPU chip in a low level mode, the IC3CPU driving chip can be turned on to supply power to the stepping motor when the pin 9 of the IC2CPU chip is set to be in the low level mode, the stepping motor drives the infrared carrier modulation device to move to modulate the infrared heat of a static or moving human body, and at the moment, the S pole of the second pyroelectric infrared sensor continuously outputs low-frequency pulsating voltage to a pin 2 of the IC1 chip. The pin 6 of the IC1 chip outputs high level, and is connected to the Q1 base pull-in relay through the resistor R7 to supply power to the load. Meanwhile, pin 6 of the IC1 chip is connected to the base of Q2 through a diode D3 resistor R10, and the collector of Q2 is inverted to low level and is connected to pin 9 of the IC2CPU chip. Because the IC1 chip has a delay setting, only the time of the second pyroelectric infrared sensor outputting the low-frequency pulse frequency is longer than the set delay time of the IC1 chip, the pin 6 of the IC1 chip keeps the high level, the pin 9 of the IC2CPU chip keeps the low level, the IC3CPU driving chip drives the stepping motor and the infrared carrier modulation device to move, and the whole pyroelectric infrared sensing switch can enter a closed-loop mode and stably enter a long-time working state. When the human body infrared heat source leaves the detection working area of the pyroelectric infrared sensor, the pyroelectric infrared sensing switch enters the standby working state again.
Claims (6)
1. The utility model provides a there is formula pyroelectric infrared inductive switch, includes first pyroelectric infrared sensor, its characterized in that: the pyroelectric infrared sensor is characterized by further comprising a second pyroelectric infrared sensor, an infrared chopping modulation device is arranged in front of the second pyroelectric infrared sensor, a plurality of windows are arranged on the infrared chopping modulation device, the infrared chopping modulation device is connected with a driving mechanism, the driving mechanism can drive the infrared chopping modulation device to move, the second pyroelectric infrared sensor corresponds to the movement tracks of the windows, and the second pyroelectric infrared sensor and the first pyroelectric infrared sensor are electrically connected with the driving mechanism.
2. The presence pyroelectric infrared inductive switch of claim 1, characterized in that: the second pyroelectric infrared sensor corresponds to the motion track of the center of the window.
3. The presence pyroelectric infrared inductive switch of claim 1, characterized in that: the infrared chopping modulation device is a plate body, a plurality of windows are arranged on the plate body, the centers of the windows are located on the same straight line, and the infrared chopping modulation device can do linear reciprocating motion relative to the second pyroelectric infrared sensor.
4. The presence pyroelectric infrared inductive switch of claim 1, characterized in that: the infrared chopping modulation device is a plate body, a plurality of windows are arranged on the plate body, the centers of the windows are located on the same circumference, and the infrared chopping modulation device can rotate relative to the second pyroelectric infrared sensor.
5. The presence pyroelectric infrared inductive switch of claim 1, characterized in that: the driving mechanism is a stepping motor.
6. The presence pyroelectric infrared inductive switch of claim 1, characterized in that: the first pyroelectric infrared sensor and the second pyroelectric infrared sensor are respectively positioned in different lenses, and the infrared chopping modulation device and the second pyroelectric infrared sensor are positioned in the same lens.
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| CN201910301325.6A CN111835330A (en) | 2019-04-15 | 2019-04-15 | Existing pyroelectric infrared induction switch |
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| CN201910301325.6A CN111835330A (en) | 2019-04-15 | 2019-04-15 | Existing pyroelectric infrared induction switch |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102607709A (en) * | 2011-03-16 | 2012-07-25 | 昆山市工业技术研究院有限责任公司 | Infrared human body sensing device |
| CN102788646A (en) * | 2012-08-30 | 2012-11-21 | 肖国选 | Active-type pyroelectric infrared sensor |
| CN102928090A (en) * | 2012-11-09 | 2013-02-13 | 南京天溯自动化控制系统有限公司 | Human body detector with interval shielding device |
| CN103148946A (en) * | 2013-02-27 | 2013-06-12 | 慈溪思达电子科技有限公司 | Universal human body induction device |
| CN106656141A (en) * | 2016-10-27 | 2017-05-10 | 蔡作华 | Pyroelectric infrared human body sensing switch |
| CN106932106A (en) * | 2017-03-29 | 2017-07-07 | 南京信息工程大学 | A kind of High-precision human infrared detection device and its detection method |
| CN107044887A (en) * | 2017-02-09 | 2017-08-15 | 深圳通感微电子有限公司 | Apparatus for detecting human body and method |
| CN209593391U (en) * | 2019-04-15 | 2019-11-05 | 蔡作华 | It is a kind of that there are formula pyroelectric infrared-sensing switches |
-
2019
- 2019-04-15 CN CN201910301325.6A patent/CN111835330A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102607709A (en) * | 2011-03-16 | 2012-07-25 | 昆山市工业技术研究院有限责任公司 | Infrared human body sensing device |
| CN102788646A (en) * | 2012-08-30 | 2012-11-21 | 肖国选 | Active-type pyroelectric infrared sensor |
| CN102928090A (en) * | 2012-11-09 | 2013-02-13 | 南京天溯自动化控制系统有限公司 | Human body detector with interval shielding device |
| CN103148946A (en) * | 2013-02-27 | 2013-06-12 | 慈溪思达电子科技有限公司 | Universal human body induction device |
| CN106656141A (en) * | 2016-10-27 | 2017-05-10 | 蔡作华 | Pyroelectric infrared human body sensing switch |
| CN107044887A (en) * | 2017-02-09 | 2017-08-15 | 深圳通感微电子有限公司 | Apparatus for detecting human body and method |
| CN106932106A (en) * | 2017-03-29 | 2017-07-07 | 南京信息工程大学 | A kind of High-precision human infrared detection device and its detection method |
| CN209593391U (en) * | 2019-04-15 | 2019-11-05 | 蔡作华 | It is a kind of that there are formula pyroelectric infrared-sensing switches |
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