CN206531582U - A kind of pyroelectric infrared sensor - Google Patents
A kind of pyroelectric infrared sensor Download PDFInfo
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- CN206531582U CN206531582U CN201720139238.1U CN201720139238U CN206531582U CN 206531582 U CN206531582 U CN 206531582U CN 201720139238 U CN201720139238 U CN 201720139238U CN 206531582 U CN206531582 U CN 206531582U
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- pyroelectric infrared
- sensor unit
- infrared sensor
- resistor
- effect transistor
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Abstract
The utility model discloses a kind of pyroelectric infrared sensor, including N-channel junction field effect transistor, the first passive sensor unit and the second passive sensor unit；The D termination power positive poles of the N-channel junction field effect transistor, G termination power negative poles, S ends are signal output part；The first passive sensor unit and the second passive sensor unit opposite polarities in series are on the G terminal circuits of N-channel junction field effect transistor, the S terminal circuits of the N-channel junction field effect transistor are provided with first resistor, and filter capacitor is respectively equipped between the two ends of the first resistor and G terminal circuits.The utility model noise suppression ability is strong, can meet the different filtering requirements of application, significantly improves product to outside electromagnetism rejection ability.
Description
Technical field
The utility model is related to sensor technical field, more particularly to a kind of pyroelectric infrared sensor.
Background technology
Pyroelectric infrared sensor is a kind of conventional infrared detector, is widely used in non-contact switch and anti-theft journal
In alert equal controller, automatically controlling, electric appliance energy-saving, the field such as security protection have broad application prospects.At present, infrared thermal releasing
Electric transducer noise suppression mode includes：One is to add filter circuit in the outside of sensor to realize noise suppression；Two be to use
The software filtering circuit realiration noise suppression such as MCU.
But, the noise suppression mode of above-mentioned pyroelectric infrared sensor has as a drawback that：One, because be that outside adds
Plus filter circuit, the distance of signal and process chip strict to cabling requirement, the parcel of width and ground wire is required for strict cloth
Line；Secondly, it is weak to the suppression of power frequency 50/60HZ interference；Thirdly, because the signal of sensor is weak, it is impossible to long lead（Letter
Number processing lead and sensor lead output distance）, otherwise easily interference.
Utility model content
The technical problems to be solved in the utility model is that there is provided a kind of noise suppression energy according to above-mentioned the deficiencies in the prior art
Power is strong, can meet the different filtering requirements of application, significantly improves infrared thermal releasing fax of the product to outside electromagnetism rejection ability
Sensor.
In order to solve the above technical problems, the technical solution of the utility model is：A kind of pyroelectric infrared sensor, including N
Raceway groove junction field effect transistor, the first passive sensor unit and the second passive sensor unit；The N-channel knot
The D termination power positive poles of field-effect transistor, G termination power negative poles, S ends are signal output part；First infrared thermal release electric
Sensing unit and the second passive sensor unit opposite polarities in series are on the G terminal circuits of N-channel junction field effect transistor, institute
The S terminal circuits for stating N-channel junction field effect transistor are provided with first resistor, between the two ends of the first resistor and G terminal circuits respectively
Provided with filter capacitor.
It is expanded on further as to of the present utility model：
Preferably, the resistance of the first resistor is 1K~20Kohm, the capacitance of the filter capacitor for 100pF~
10uF。
Preferably, the pyroelectric infrared sensor also includes second resistance, and the second resistance is arranged at the N-channel junction field
On the D terminal circuits of effect transistor；The resistance of the second resistance is 100ohm~10Kohm.
Preferably, the pyroelectric infrared sensor also includes 3rd resistor, the 3rd resistor and first infrared thermal releasing
Electric sensing unit and the second passive sensor unit are in parallel；The resistance of the 3rd resistor is 1~100Gohm.
Preferably, the pyroelectric infrared sensor also includes metal shell and optical filter, and metal shell filters provided with installation
The window of piece, optical filter is relative with the position of the first passive sensor unit and the second passive sensor unit.
The beneficial effects of the utility model are：The utility model is added in sensor internal and filtered by first resistor and two
The π type filter circuits of electric capacity composition, can improve the signal interference rejection capability of product noise suppression ability and product to long range.
Using the advantage of π type filter circuits：One, product is improved to the rejection ability of high frequency, can flexible design frequency；Secondly,
Improve rejection ability of the product to outside electromagnetism, the distance between product and signal processing chip adaptability are stronger, product
The stability of thermal response signal is higher.
Brief description of the drawings
Fig. 1 is the circuit structure diagram of pyroelectric infrared sensor.
Embodiment
Structural principle of the present utility model and operation principle are described in further detail below in conjunction with the accompanying drawings.
As shown in figure 1, the utility model is a kind of pyroelectric infrared sensor, including N-channel junction field effect transistor Q1、
First passive sensor unit B1And the second passive sensor unit B2；The N-channel junction field effect transistor Q1's
D termination power positive poles, G termination power negative poles, S ends are signal output part；The first passive sensor unit B1With
Two passive sensor unit Bs2Opposite polarities in series is in N-channel junction field effect transistor Q1G terminal circuits on, the N-channel knot
Field-effect transistor Q1S terminal circuits be provided with first resistor RS, first resistor RSTwo ends and G terminal circuits between be respectively equipped with
Filter capacitor C1、C2.The first resistor RSAnd two filter capacitor C1、C2The π type filter circuits of composition, can improve product noise
Rejection ability and product are to the signal interference rejection capability of long range, the first resistor RSResistance be 1K~20Kohm, institute
State filter capacitor C1、C2Capacitance be 100pF~10uF；According to external circuit environment, first resistor R can be changedSResistance and filter
Ripple electric capacity C1、C2Capacitance, optimization filtering.
As shown in figure 1, the pyroelectric infrared sensor also includes second resistance RD, i.e. power surge resistance, second electricity
Hinder RDIt is arranged at the N-channel junction field effect transistor Q1D terminal circuits on.The second resistance RDResistance for 100ohm~
10Kohm。
As shown in figure 1, the pyroelectric infrared sensor also includes 3rd resistor RG, i.e. gate resistor, 3rd resistor RGWith institute
State the first passive sensor unit B1And the second passive sensor unit B2It is in parallel.The 3rd resistor RGResistance
For 1~100Gohm.
As shown in figure 1, the pyroelectric infrared sensor also includes metal shell 1 and optical filter 2, metal shell 1 is provided with peace
Fill the window of optical filter, the passive sensor unit B of optical filter 2 and first1And the second passive sensor unit B2Position
Put relative.By taking the infrared ray sensor for detecting human body radiation as an example：Human body radiation infrared ray centre wavelength is 9 ~ 10 μm, and is detected
The wavelength sensitivity of element is almost stablized constant in 0.2 ~ 20 μ m.Optical filter can be 7 ~ 10 μ by the wave-length coverage of light
M, quite well to the detection of human infrared radiation, and is absorbed to the infrared ray of other wavelength by optical filter, so just shape
Into a kind of infrared ray sensor for being dedicated as detecting human body radiation.
It is described above, be only the utility model better embodiment, it is every according to the technical solution of the utility model to
On any subtle modifications, equivalent variations and modifications for being made of embodiment, belong to the scope of technical solutions of the utility model
It is interior.
Claims (7)
1. a kind of pyroelectric infrared sensor, including N-channel junction field effect transistor, the first passive sensor unit and
Two passive sensor units；The D termination power positive poles of the N-channel junction field effect transistor, G termination power negative poles, S ends
For signal output part；The first passive sensor unit and the second passive sensor unit opposite polarities in series are in N
On the G terminal circuits of raceway groove junction field effect transistor, it is characterised in that：The S terminal circuits of the N-channel junction field effect transistor are provided with
First resistor, filter capacitor is respectively equipped between the two ends of the first resistor and G terminal circuits.
2. pyroelectric infrared sensor according to claim 1, it is characterised in that：The resistance of the first resistor be 1K~
20Kohm, the capacitance of the filter capacitor is 100pF~10uF.
3. pyroelectric infrared sensor according to claim 1, it is characterised in that：The pyroelectric infrared sensor also includes
Second resistance, the second resistance is arranged on the D terminal circuits of the N-channel junction field effect transistor.
4. pyroelectric infrared sensor according to claim 3, it is characterised in that：The resistance of the second resistance is
100ohm~10Kohm.
5. pyroelectric infrared sensor according to claim 1, it is characterised in that：The pyroelectric infrared sensor also includes
3rd resistor, the 3rd resistor is in parallel with the first passive sensor unit and the second passive sensor unit.
6. pyroelectric infrared sensor according to claim 5, it is characterised in that：The resistance of the 3rd resistor be 1~
100Gohm。
7. pyroelectric infrared sensor according to claim 1, it is characterised in that：The pyroelectric infrared sensor also includes
Metal shell and optical filter, metal shell is provided with the window for installing optical filter, optical filter and the first passive sensor unit
And second passive sensor unit position it is relative.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720139238.1U CN206531582U (en) | 2017-02-16 | 2017-02-16 | A kind of pyroelectric infrared sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720139238.1U CN206531582U (en) | 2017-02-16 | 2017-02-16 | A kind of pyroelectric infrared sensor |
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| Publication Number | Publication Date |
|---|---|
| CN206531582U true CN206531582U (en) | 2017-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720139238.1U Active CN206531582U (en) | 2017-02-16 | 2017-02-16 | A kind of pyroelectric infrared sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108881620A (en) * | 2018-05-29 | 2018-11-23 | 奇酷互联网络科技（深圳）有限公司 | Mobile terminal awakening method, device and mobile terminal |
| CN116164847A (en) * | 2023-03-14 | 2023-05-26 | 无锡瀚科检测有限公司 | Infrared thermopile temperature sensing detection device with self-correction circuit and detection method |
-
2017
- 2017-02-16 CN CN201720139238.1U patent/CN206531582U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108881620A (en) * | 2018-05-29 | 2018-11-23 | 奇酷互联网络科技（深圳）有限公司 | Mobile terminal awakening method, device and mobile terminal |
| CN116164847A (en) * | 2023-03-14 | 2023-05-26 | 无锡瀚科检测有限公司 | Infrared thermopile temperature sensing detection device with self-correction circuit and detection method |
| CN116164847B (en) * | 2023-03-14 | 2023-09-22 | 无锡瀚科检测有限公司 | Infrared thermopile temperature sensing detection device with self-correction circuit and detection method |
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