CN202393501U - Four-channel pyroelectric infrared sensor - Google Patents
Four-channel pyroelectric infrared sensor Download PDFInfo
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- CN202393501U CN202393501U CN2011205532209U CN201120553220U CN202393501U CN 202393501 U CN202393501 U CN 202393501U CN 2011205532209 U CN2011205532209 U CN 2011205532209U CN 201120553220 U CN201120553220 U CN 201120553220U CN 202393501 U CN202393501 U CN 202393501U
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- infrared
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- channel sensor
- pyroelectric infrared
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Abstract
The utility model provides a four-channel pyroelectric infrared sensor, comprising a pipe cap, four infrared filtering windows, a pipe seat, pipe pins and a circuit board, wherein the circuit board is provided with four channel sensor circuits, each channel sensor circuit comprises a pyroelectric infrared sensitive component, a pyroelectric compensation sensitive component, a preamplifier field effect transistor and an impedance matching resistor, the impedance matching resistor is connected with the pyroelectric infrared sensitive component in parallel, the pyroelectric infrared sensitive component and the upper electrode of the pyroelectric compensation sensitive component are respectively connected with the grid electrode of the preamplifier field effect transistor, the pyroelectric infrared sensitive component and the lower electrode of the pyroelectric compensation sensitive component are connected with a grounding end, the drain electrode and the source electrode of the preamplifier field effect transistor are respectively used as a power supply end and a signal end, the pyroelectric infrared sensitive component and the pyroelectric compensation sensitive component are arranged on supporters, and each channel sensor is corresponding to one infrared filtering window. The four-channel pyroelectric infrared sensor has the advantages of being small in size, strong in anti-inference capability and high in sensitivity.
Description
Technical field
The utility model relates to a kind of infrared sensor, specifically, has related to a kind of four-way pyroelectric infrared sensor.
Background technology
Existing pyroelectric infrared sensor is the single channel pyroelectric infrared sensor mostly, and the single channel pyroelectric infrared sensor do not have reference and compensating signal, and output signal accuracy has certain limitation, is difficult to satisfy the needs in market.
For this reason, people are seeking a kind of desirable technical solution always.
Summary of the invention
The purpose of the utility model is the deficiency to prior art, thereby a kind of design science, volume is little, antijamming capability is strong and highly sensitive four-way pyroelectric infrared sensor are provided.
To achieve these goals; The technical scheme that the utility model adopted is: a kind of four-way pyroelectric infrared sensor, and it comprises, and pipe cap, four are arranged on the infrared absorption filter optical window at said pipe cap top, the base, six that are arranged on said pipe cap bottom is arranged on the pin on the said base and is encapsulated in the circuit board in the said pipe cap; Wherein, Said circuit board is provided with four channel sensor circuit; Each said channel sensor circuit comprises the responsive unit of a rpyroelectric infrared, a responsive unit of pyroelectricity compensation, a prime amplifier FET and an impedance matching resistance; The two ends of said impedance matching resistance are connected between the top electrode and bottom electrode of the responsive unit of said rpyroelectric infrared; The responsive unit of said rpyroelectric infrared compensates the grid that responsive first top electrode is connected said prime amplifier FET respectively with said pyroelectricity; The bottom electrode of responsive unit of said rpyroelectric infrared and the responsive unit of said pyroelectricity compensation is as the earth terminal of said channel sensor circuit, and the drain electrode of said prime amplifier FET and source electrode are respectively as the power end and the signal end of said channel sensor circuit; Said circuit board is provided with eight supporters, and responsive unit of the rpyroelectric infrared of four said channel sensor circuit and pyroelectricity compensate responsive unit and be separately positioned on eight said supporters; The corresponding said infrared absorption filter optical window of responsive unit of the rpyroelectric infrared of each said channel sensor circuit and the responsive unit of pyroelectricity compensation; The first said pin connects the earth terminal of four said channel sensor circuit; The second said pin connects the power end of four said channel sensor circuit, and the the the 3rd, the 4th, the 5th, the 6th said pin connects the signal end of four said channel sensor circuit respectively.
Based on above-mentioned, said circuit board is the individual layer double-sided printed-circuit board.
Based on above-mentioned, responsive unit of said rpyroelectric infrared and the responsive unit of said pyroelectricity compensation adopt SMT automatic chip mounting technology to be arranged on the said supporter.
Based on above-mentioned, said supporter is a ferrite.
The relative prior art of the utility model has substantive distinguishing features and progress, and specifically, this sensor adopts individual layer double-sided printed-circuit board structure; Do not increasing sensor bulk and reducing under the prerequisite of FET volume; Realized the preparation of four-way pyroelectric infrared sensor, simultaneously, this structure can adopt SMT automatic chip mounting production technology and bind the power traction Wiring technology; Be beneficial to the make efficiency that improves sensor, reduce production costs; Responsive unit of said rpyroelectric infrared and said pyroelectricity compensate responsive unit and are set to double base reverse parallel connection structure, can weaken and eliminate the influence of environmental disturbances such as ambient vibration and temperature fluctuation to said pyroelectric infrared sensor from structure; The optical filtering window can the wiping out background visible light and the interference of other non-detecting band light to said pyroelectric infrared sensor, has further strengthened the antijamming capability of pyroelectric infrared sensor.
Description of drawings
Fig. 1 is the structural representation of said four-way pyroelectric infrared sensor.
Fig. 2 is the polycrystalline substance synoptic diagram of said base.
Fig. 3 is the top structure synoptic diagram of said pipe cap.
Fig. 4 is the electrical block diagram of said channel sensor circuit.
Embodiment
Through embodiment, the technical scheme of the utility model is done further detailed description below.
Like Fig. 1, Fig. 2, Fig. 3 and shown in Figure 4; A kind of four-way pyroelectric infrared sensor, it comprises, and pipe cap 1, four are arranged on the infrared absorption filter optical window 4 at said pipe cap 1 top, the base 2, six that are arranged on said pipe cap 1 bottom is arranged on the pin 3 on the said base 2 and is encapsulated in the circuit board 5 in the said pipe cap 1; Said circuit board 5 is contained on the said base 2, and through said base 2 go between the location and be connected; Said circuit board 5 is coated with the insulation colloid with said base 2 junctions; Said circuit board 5 is individual layer double-sided printed-circuit boards.
Wherein, Said circuit board 5 is provided with four channel sensor circuit; Each said channel sensor circuit comprises that the responsive first C1 of a rpyroelectric infrared, a pyroelectricity compensate responsive first C2, a prime amplifier FET Q and an impedance matching resistance R g; The two ends of said impedance matching resistance R g are connected between the top electrode and bottom electrode of the responsive first C1 of said rpyroelectric infrared; The top electrode that the responsive first C1 of said rpyroelectric infrared and said pyroelectricity compensate responsive first C2 is connected the grid of said prime amplifier FET Q respectively through spun gold; Responsive first C1 of said rpyroelectric infrared and said pyroelectricity compensate the earth terminal of the bottom electrode of responsive first C2 as said channel sensor circuit, and the drain electrode of said prime amplifier FET Q and source electrode are respectively as the power end VCC and the signal end Vs of said channel sensor circuit; During work, connect a pull down resistor Rs at signal end Vs, so that output voltage signal; Through the P.e.c. on the circuit board, realize that the electricity between the responsive unit of rpyroelectric infrared, the responsive unit of pyroelectricity compensation, prime amplifier FET, the impedance matching resistance connects.
The responsive unit of rpyroelectric infrared and pyroelectricity that said circuit board 5 is provided with 6, four said channel sensor circuit of eight supporters compensate responsive unit and are separately positioned on eight said supporters 6; Adopt SMT automatic chip mounting technology; Four prime amplifier FETs and four impedance matching resistance directly are attached to said circuit board top; Four responsive units of said rpyroelectric infrared and four said pyroelectricities compensate responsive unit and are attached to respectively on eight said supporters 6, and said supporter 6 is ferrites.
The corresponding said infrared absorption filter optical window of responsive unit of the rpyroelectric infrared of each said channel sensor circuit and the responsive unit of pyroelectricity compensation.
The first said pin connects the earth terminal of four said channel sensor circuit; The second said pin connects the power end of four said channel sensor circuit, and the the the 3rd, the 4th, the 5th, the 6th said pin connects the signal end of four said channel sensor circuit respectively.
Adopt single layer board to make the four-way pyroelectric infrared sensor; Paths passage as a reference wherein; Other is three the tunnel as measuring path, measures the concentration that the channel voltage value can detect three kinds of gas with various to be measured through contrast reference channel magnitude of voltage and three; As the window of the pyroelectric sensor of narrow band pass filter, select for use and the corresponding optical filter of the absorption band of gas to be measured, through the different gas of the incompatible detection of different filter set; The pairing optical filter wavelength of reference path is 3.9 microns, measures the pairing optical filter of passage for three and can realize multiple combination, can be the different absorption bands combinations of gas of the same race, also can be the characteristic wave bands combination of not gas of the same race.
Infrared radiation is through the filtration of said infrared absorption filter optical window; Filtering after bias light etc. disturbs; Absorbed by responsive unit, and convert the pyroelectric response signal into, through the setting of double base reverse parallel connection structure through pyroelectric effect; The difference of two response signals is the thermoelectric response signal of output, and this has just got rid of the interference of environmental factors such as temperature from structure; The responsive unit of described rpyroelectric infrared is the capacitive device with extra high source impedance, so will dispose the low noise prime amplifier FET of high input impedance in use.
When device is encapsulated; The quality of encapsulation can influence the reliability and stability of device; So pyroelectric infrared sensor is vacuumized; And be full of nitrogen, adopt the method for packing of energy storage welding to be encapsulated in the pyroelectric infrared sensor semi-manufacture that prepare in the shell that has the infrared filtering window then.
The utility model can be realized drawing of thermoelectric response signal through binding the power traction line, can improve the make efficiency and the consistency of product of the responsive unit of rpyroelectric infrared like this, also can improve the detection performance of pyroelectric infrared sensor simultaneously.
Should be noted that at last: above embodiment only in order to the explanation the utility model technical scheme but not to its restriction; Although with reference to preferred embodiment the utility model has been carried out detailed explanation, the those of ordinary skill in affiliated field is to be understood that: still can make amendment to the embodiment of the utility model perhaps is equal to replacement to the part technical characterictic; And not breaking away from the spirit of the utility model technical scheme, it all should be encompassed in the middle of the technical scheme scope that the utility model asks for protection.
Claims (4)
1. four-way pyroelectric infrared sensor is characterized in that: it comprises, and pipe cap, four are arranged on the infrared absorption filter optical window at said pipe cap top, the base, six that are arranged on said pipe cap bottom is arranged on the pin on the said base and is encapsulated in the circuit board in the said pipe cap; Wherein, Said circuit board is provided with four channel sensor circuit; Each said channel sensor circuit comprises the responsive unit of a rpyroelectric infrared, a responsive unit of pyroelectricity compensation, a prime amplifier FET and an impedance matching resistance; The two ends of said impedance matching resistance are connected between the top electrode and bottom electrode of the responsive unit of said rpyroelectric infrared; The responsive unit of said rpyroelectric infrared compensates the grid that responsive first top electrode is connected said prime amplifier FET respectively with said pyroelectricity; The bottom electrode of responsive unit of said rpyroelectric infrared and the responsive unit of said pyroelectricity compensation is as the earth terminal of said channel sensor circuit, and the drain electrode of said prime amplifier FET and source electrode are respectively as the power end and the signal end of said channel sensor circuit; Said circuit board is provided with eight supporters, and responsive unit of the rpyroelectric infrared of four said channel sensor circuit and pyroelectricity compensate responsive unit and be separately positioned on eight said supporters; The corresponding said infrared absorption filter optical window of responsive unit of the rpyroelectric infrared of each said channel sensor circuit and the responsive unit of pyroelectricity compensation; The first said pin connects the earth terminal of four said channel sensor circuit; The second said pin connects the power end of four said channel sensor circuit, and the the the 3rd, the 4th, the 5th, the 6th said pin connects the signal end of four said channel sensor circuit respectively.
2. four-way pyroelectric infrared sensor according to claim 1 is characterized in that: said circuit board is the individual layer double-sided printed-circuit board.
3. four-way pyroelectric infrared sensor according to claim 1 and 2 is characterized in that: responsive unit of said rpyroelectric infrared and the responsive unit of said pyroelectricity compensation adopt SMT automatic chip mounting technology to be arranged on the said supporter.
4. four-way pyroelectric infrared sensor according to claim 1 and 2 is characterized in that: said supporter is a ferrite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205532209U CN202393501U (en) | 2011-12-27 | 2011-12-27 | Four-channel pyroelectric infrared sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205532209U CN202393501U (en) | 2011-12-27 | 2011-12-27 | Four-channel pyroelectric infrared sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202393501U true CN202393501U (en) | 2012-08-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205532209U Withdrawn - After Issue CN202393501U (en) | 2011-12-27 | 2011-12-27 | Four-channel pyroelectric infrared sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202393501U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102538978A (en) * | 2011-12-27 | 2012-07-04 | 郑州炜盛电子科技有限公司 | Four-channel pyroelectric infrared sensor |
| CN103413806A (en) * | 2013-08-23 | 2013-11-27 | 电子科技大学 | Pyroelectric sensor packaging structure |
-
2011
- 2011-12-27 CN CN2011205532209U patent/CN202393501U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102538978A (en) * | 2011-12-27 | 2012-07-04 | 郑州炜盛电子科技有限公司 | Four-channel pyroelectric infrared sensor |
| CN102538978B (en) * | 2011-12-27 | 2013-04-03 | 郑州炜盛电子科技有限公司 | Four-channel pyroelectric infrared sensor |
| CN103413806A (en) * | 2013-08-23 | 2013-11-27 | 电子科技大学 | Pyroelectric sensor packaging structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120822 Effective date of abandoning: 20130403 |
|
| RGAV | Abandon patent right to avoid regrant |