CN206378206U - A kind of quick response pyroelectric detector based on current type - Google Patents
A kind of quick response pyroelectric detector based on current type Download PDFInfo
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- CN206378206U CN206378206U CN201720047514.1U CN201720047514U CN206378206U CN 206378206 U CN206378206 U CN 206378206U CN 201720047514 U CN201720047514 U CN 201720047514U CN 206378206 U CN206378206 U CN 206378206U
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- pyroelectric detector
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Abstract
The utility model is related to a kind of quick response pyroelectric detector based on current type, includes encapsulating package, optical filter F and the current type element circuit of inner hollow；The upper surface of the encapsulating package offers window, and the filter plate, which is inlayed, to be arranged in the window, and the current type element circuit is arranged in the encapsulating package, and the output end of the current type element circuit externally exports detectable signal.A kind of quick response pyroelectric detector based on current type of the present utility model, using current type circuit, the ability of anti-outside noise interference is strong, it is possible to achieve the quick response of infra-red radiation to external world, and start preheating and signal stabilization time shorten.
Description
Technical field
The utility model is related to infrared detection technique field, more particularly to a kind of quick response pyroelectricity based on current type
Detector.
Background technology
In nature, any object higher than absolute temperature (- 273k) will all produce infrared spectrum, the object of different temperatures
The wavelength of the infrared energy of release is different, therefore infrared wavelength is related, and emittance to the height of temperature
Size it is relevant with body surface temperature.Pyroelectric detector be it is a kind of based on infrared emanation principle be made it is red by detecting
Outside line detects the detector of people or object, is widely used for radiation and non-contact type temperature measurement, infrared spectrometry, laser
In parameter measurement, industry automatic control, space technology, infrared photography.
Wide variety of pyroelectric detector is voltage mode both at home and abroad at present, and voltage-type pyroelectric detector structure is simpler
It is single.Sensor main will be made up of optical filter, pyroelectricity sensor chip, technotron JFET etc..Under voltage mode, from
The pyroelectricity electric current produced on pyroelectricity sensor chip to chip capacity charge, voltage signal be then by a simple source electrode with
Exported with device (source resistance of JFET, gate resistor and an outside), signal magnitude is close to 1:1 output.
Although voltage-type pyroelectric detector structure is simple, there are problems and shortcoming, such as：
1st, the voltage signal of voltage mode pyroelectric detector is with 1:1 multiplication factor is exported, and signal amplitude is small, easily by each
Plant noise, the interference of thermal source and light source；
2nd, under voltage mode, the electroresponse time constant of pyroelectric detector is electric by the capacitance CP and door of pyroelectricity chip
The resistance RG of resistance is calculated and obtained, and the response time is big, and the speed of response is slow.And heated battery core chip size of releasing is limited, to ensure performance, no
Being altered by material and circuit parameter is improved；
3rd, its maximum responsiveness is obtained outside typical modulating frequency, and as little as several millihertzs of low-frequency disturbance can hereby be passed
Pass, so detector needs to stand tens seconds to stablize, stabilization time is long；
4th, the stable sex expression using the voltage mode pyroelectric detector hot environment of technotron is weaker, and electricity
The gate resistor resistance that die pressing type circuit is used is very high, and thermal shock and temperature fluctuation can cause temperature drift phenomenon, need to be using reverse
Serial or parallel connection pyroelectricity chip carries out thermal compensation.But it is due to the equivalent capacity that shunt compensation has increased exponentially input,
So as to increase the response time of detector again, while causing the decay of detector output signal.
Utility model content
Technical problem to be solved in the utility model is based on electric current for above-mentioned the deficiencies in the prior art there is provided one kind
The quick response pyroelectric detector of formula.
The technical scheme that the utility model solves above-mentioned technical problem is as follows：A kind of quick response heat based on current type is released
Electric explorer, includes encapsulating package, optical filter F and the wiring board of inner hollow.The encapsulating package includes pipe cap and base, institute
State optical filter F and inlay and be arranged in the window that the pipe cap upper surface is opened up, the pipe cap is fastened on the base, and with institute
The sealing structure of base formation inner hollow is stated, the wiring board is arranged on the base and in the sealing structure,
The wiring board is provided with current type element circuit, and the current type element circuit is located at the underface of the optical filter F, institute
The positive supply input for stating current type element circuit is electrically connected with external power source positive pole V+, and negative supply input and external power source are just
Pole V- is electrically connected, and the output end of the current type element circuit externally exports detectable signal.
The beneficial effects of the utility model are：A kind of quick response pyroelectricity detection based on current type of the present utility model
Device, using current type element circuit, the ability of anti-outside noise interference is strong, it is possible to achieve the quick sound of infra-red radiation to external world
Should, start preheating and signal stabilization time shorten.
On the basis of above-mentioned technical proposal, the utility model can also do following improvement：
Further：The pipe cap surface is coated with nickel dam, and the susceptor surface is coated with layer gold.
The beneficial effect of above-mentioned further scheme is：Surface erosion resistance and inoxidizability can be improved by nickel plating, led to
Crossing gold-plated on the base can improve the stability and inoxidizability of base.
Further：The current type element circuit includes pyroelectric sensing circuit and amplification feedback circuit, the pyroelectricity
Sensor circuit is connected electrically between two inputs of the amplification feedback circuit, and the output end of the amplification feedback circuit is external
Export detectable signal.
The beneficial effect of above-mentioned further scheme is：It can be directed to through described and filtered by the pyroelectric sensing circuit
Piece F infrared ray produces induced-current, and output to the amplification feedback circuit is amplified processing, improves anti-outside noise and does
Ability is disturbed, and it is steady to improve the response time, start preheating time and signal of detector by adjusting the parameter value of feedback component
Fix time.
Further：The pyroelectric sensing circuit uses relaxor ferroelectric monocrystal PIMNT pyroelectricity chips U.
The beneficial effect of above-mentioned further scheme is：Relaxor ferroelectric monocrystal PIMNT has higher pyroelectric property, can
Improve the precision of detection.
Further：The amplification feedback circuit includes operational amplifier A, feedback resistance RfWith feedback capacity Cf, the fortune
The positive supply input for calculating amplifier A is electrically connected with external power source positive pole V+, negative supply input and external power source positive pole V- electricity
Connection, the pyroelectric sensing is electrically connected between the in-phase input end of the operational amplifier A and inverting input, described
Feedback resistance RfWith feedback capacity CfIt is connected in parallel between the inverting input of the operational amplifier A and output end, the computing is put
Big device A in-phase input end ground connection, output end externally exports detectable signal.
The beneficial effect of above-mentioned further scheme is：By the operational amplifier A it is possible to prevente effectively from parasitic capacitance is led
Permanent pyroelectricity chip voltage skew caused by the Electro Magnetic Compatibility reduction of cause, the gate-source pinch-off voltage of technotron,
And current noise is to the dependence of temperature.
Further：The operational amplifier A uses unencapsulated operational amplifier chip, the feedback resistance RfUsing exhausted
Edge Chip-R, the feedback capacity CfUsing NPO ceramic condensers；Wherein, the feedback resistance RfTemperature coefficient be less than or wait
In 1000PPM/K, Standard resistance range is 10-100G Ω.
The beneficial effect of above-mentioned further scheme is：Unencapsulated operational amplifier chip small volume, is easy to be integrated in institute
State inside shell, using high value Low Drift Temperature insulating pad resistance, temperature drift is very small, and error is small；Using Low Drift Temperature NPO ceramic electricals
Hold, with very high temperature stabilization characteristic, temperature drift is very small, and capacitor's capacity is minimum, far below pyroelectricity chip capacity, to drop
The response time of low detector, improve the speed of response.
Further：Also include flying shore frame, the flying shore frame be arranged on the base and with the base shape
Into heat-insulation chamber, pyroelectric sensing circuit is vacantly arranged on the wiring board (3) by the flying shore frame (4).
The beneficial effect of above-mentioned further scheme is：Preferable effect of heat insulation can be played by the flying shore frame,
The thermal loss that pyroelectric sensing circuit is produced in the current type element circuit is avoided as far as possible, improves the pyroelectric sensing electricity
The precision on road.
Further：The wiring board is made up of alumina ceramic material.
The beneficial effect of above-mentioned further scheme is：Using high insulating ceramics circuit board, eliminate due to circuit board
The introduced parasitic capacitance of material difference and noise, improve the electrical stability of electronic component carrier.
Further：The quantity of the optical filter F and current type element circuit be two and more than, and three's quantity phase
Deng the optical filter F is embedded in the window correspondingly, and the current type element circuit is arranged on the wiring board
On, and immediately below the corresponding optical filter F.
The beneficial effect of above-mentioned further scheme is：Multiple detection channels can be formed through the above way, exported simultaneously
Multiplexed detection signal, improves the accuracy of detection.
Brief description of the drawings
Fig. 1 is a kind of quick response pyroelectric detector structural representation based on current type of the present utility model；
Fig. 2 is the current type element circuit structural representation of the utility model embodiment one；
Fig. 3 is the current type element circuit structural representation of the utility model embodiment two；
Fig. 4 is speed of response curve of the existing voltage-type pyroelectric detector to square-wave signal；
Fig. 5 is speed of response curve of the current type pyroelectric detector of the present utility model to square-wave signal.
In accompanying drawing, the list of parts representated by each label is as follows：
1st, pipe cap, 2, base, 3, wiring board, 4, flying shore frame.
Embodiment
Principle of the present utility model and feature are described below in conjunction with accompanying drawing, example is served only for explaining this practicality
It is new, it is not intended to limit scope of the present utility model.
As shown in figure 1, a kind of quick response pyroelectric detector based on current type, includes the package tube of inner hollow
Shell, optical filter F and wiring board 3.
The encapsulating package includes pipe cap 1 and base 2, and the optical filter F, which inlays, to be arranged on the upper surface of pipe cap 1 and open
If window in, the pipe cap 1 is fastened on the base 2, and with the base 2 formation inner hollow sealing structure, institute
State wiring board 3 to be arranged on the base 2 and in the sealing structure, the wiring board 3 is provided with current type unit electricity
Road, and the current type element circuit is located at the underface of the optical filter F, the positive supply input of the current type element circuit
End is electrically connected with external power source positive pole V+, and negative supply input is electrically connected with external power source positive pole V-, the current type unit electricity
The output end on road externally exports detectable signal.
The pyroelectric detector of above-described embodiment, using current type element circuit, the ability of anti-outside noise interference is strong, can
To realize the quick response of infra-red radiation to external world, start preheating and signal stabilization time shorten.By using said structure, just
Detector is packaged in convenient during production and processing technology, and outside infrared ray is after filtering after piece filtering,
The infrared ray of specific wavelength is reached by current type element circuit, is absorbed by the current type element circuit and is produced electric current, is passed through
Detectable signal is generated after signal transacting and is exported.
Preferably as one embodiment of the present utility model, the surface of pipe cap 1 is coated with nickel dam, the surface of base 2
It is coated with layer gold.Surface erosion resistance and inoxidizability can be improved by nickel plating, can be improved by gold-plated on the base 2
The stability and inoxidizability of base 2.
As shown in Fig. 2 in the utility model embodiment, the current type element circuit includes pyroelectric sensing circuit and put
Big feedback circuit, the pyroelectric sensing circuit is connected electrically between two inputs of the amplification feedback circuit, described to put
The output end of big feedback circuit externally exports detectable signal.It can be directed to through described and filtered by the pyroelectric sensing circuit
Piece F infrared ray produces induced-current, and output to the amplification feedback circuit is amplified processing, is put due to being integrated with inside
Big circuit, the original induced signal of detection is exaggerated tens times to hundred times output, and magnitude is significantly increased compared with traditional mode, carried
High anti-outside noise interference performance, and it is pre- to shorten response time of detector, start by adjusting the parameter value of feedback component
Hot time and signal stabilization time.
As shown in Figures 4 and 5, Fig. 4 is speed of response curve of the existing voltage-type pyroelectric detector to square-wave signal, figure
5 be speed of response curve of the voltage-type pyroelectric detector of the present utility model to square-wave signal.Using electricity of the present utility model
Pressure type pyroelectric detector, its response time is substantially faster than existing voltage-type pyroelectric detector, it might even be possible to reach more than ten
Millisecond, it can be seen that, the voltage-type pyroelectric detector speed of response of the present utility model is far superior to the speed of voltage mode.
Under current-mode, most of detector working frequency is between thermal time constant and electrical time constant.At this
In frequency band, signal voltage reaches maximum, very gentle in whole frequency band.Low-frequency disturbance is lower than lower frequency limit one
The order of magnitude, being suppressed compared to voltage mode has as many as 10 times, only need to stand several seconds and can allow signal stabilization, substantially reduce letter
Number stabilization time.
Preferably as one embodiment of the present utility model, the pyroelectric sensing circuit uses relaxor ferroelectric monocrystal
PIMNT pyroelectricity chips U.Using relaxor ferroelectric monocrystal PIMNT pyroelectric effect, when extraneous infrared radiation to relaxor ferroelectric
Electric current will be produced when on monocrystalline PIMNT, the size of electric current depends on the infrared ray energy being radiated on relaxor ferroelectric monocrystal PIMNT
Measure size.Relaxor ferroelectric monocrystal PIMNT has higher pyroelectric property, it is possible to increase the precision of detection.
In the utility model embodiment, the amplification feedback circuit includes operational amplifier A, feedback resistance RfAnd feedback
Electric capacity Cf, the positive supply input of the operational amplifier A electrically connects with external power source positive pole V+, negative supply input with it is outside
Positive source V- is electrically connected, and the pyroelectric sensing is electrically connected to the in-phase input end of the operational amplifier A and anti-phase defeated
Enter between end, the feedback resistance RfWith feedback capacity CfBe connected in parallel on the operational amplifier A inverting input and output end it
Between, the in-phase input end ground connection of the operational amplifier A, output end externally exports detectable signal.Pass through the operational amplifier A
It is possible to prevente effectively from Electro Magnetic Compatibility is reduced caused by parasitic capacitance, caused by the gate-source pinch-off voltage of technotron
Permanent pyroelectricity chip voltage skew, and current noise is to the dependence of temperature.
Under current-mode, the electroresponse time of pyroelectric detector is by feedback capacity CfWith feedback resistance RfCalculate and
, because the capacitance of feedback capacity can be adjusted, it can almost be worked under any electrical time constant.Feedback capacity is typically chosen
Below 1pF, the typical response time is more than ten ms ranks, and response speed is much better than voltage mode.
Preferably as one embodiment of the present utility model, the operational amplifier A uses unencapsulated operation amplifier
Device chip, the feedback resistance RfUsing insulating pad resistance, the feedback capacity CfUsing NPO ceramic condensers；Wherein, it is described
Feedback resistance RfTemperature coefficient be less than or equal to 1000PPM/K, Standard resistance range be 10-100G Ω.Unencapsulated operation amplifier
Device chip volume is small, is easy to be integrated in inside the shell, using high value Low Drift Temperature insulating pad resistance, and temperature drift is very small,
Error is small；Using Low Drift Temperature NPO ceramic condensers, with very high temperature stabilization characteristic, temperature drift is very small, capacitor's capacity pole
It is small, far below pyroelectricity chip capacity, to reduce the response time of detector, improve the speed of response.
Preferably as one embodiment of the present utility model, the detector also includes flying shore frame 4, described outstanding
Empty support frame 4 is arranged on the base 2 and forms heat-insulation chamber with the base 2, and pyroelectric sensing circuit passes through described hanging
Support frame 4 is vacantly arranged on the wiring board 3.Preferable effect of heat insulation can be played by the flying shore frame 4, as far as possible
The heat transfer that pyroelectric sensing circuit is produced in the current type element circuit is avoided, the pyroelectric sensing circuit is improved
Precision.
Preferably as one embodiment of the present utility model, the wiring board 3 is made up of alumina ceramic material.Adopt
With high insulating ceramics circuit board, eliminate due to the introduced parasitic capacitance of the material of circuit board 3 difference and noise, improve electronics
The electrical stability of component carrier.
Preferably as one embodiment of the present utility model, the current type element circuit uses SMT paster techniques
And gold ball bonding wire-bonding technique is processed.It can be subtracted as far as possible by SMT paster techniques and gold ball bonding wire-bonding technique
The area of contact point during small welding, to reduce the parasitic capacitance and stray capacitance in circuit.
As shown in figure 3, preferably as one embodiment of the present utility model, the window of the upper surface of pipe cap 1, filter
The quantity of mating plate F and current type element circuit be two and more than, and three's quantity is equal, and the optical filter F is corresponded
Ground is embedded in the window, and the current type element circuit is arranged on the wiring board 3, and positioned at the corresponding optical filtering
Immediately below piece F.Multiple detection channels can be formed through the above way, while output multi-channel detectable signal, improves the essence of detection
Exactness.
The twin-channel pyroelectric detector shown in Fig. 3, in practice, two filter plate F1And F2Setting is inlayed respectively
In two windows on the shell, and two current type element circuits are arranged in the shell, and positioned at corresponding institute
State optical filter F1Or F2Operational amplifier A in underface, two current type element circuits1And A2Positive supply input difference
Electrically connected with external power source positive pole V+, negative supply input is electrically connected with external power source positive pole V- respectively, the company of remaining component
Connect the single channel a kind of with embodiment identical.
Certain pyroelectric detector of the present utility model can also be more multichannel, no longer show one by one here, these are all
In protection domain of the present utility model.
Preferred embodiment of the present utility model is the foregoing is only, it is all in this practicality not to limit the utility model
Within new spirit and principle, any modification, equivalent substitution and improvements made etc. should be included in guarantor of the present utility model
Within the scope of shield.
Claims (9)
1. a kind of quick response pyroelectric detector based on current type, it is characterised in that：Encapsulating package including inner hollow,
Optical filter F and wiring board (3)；
The encapsulating package includes pipe cap (1) and base (2), and the optical filter F, which inlays, to be arranged on the pipe cap (1) upper surface and open
If window in, the pipe cap (1) is fastened on the base (2), and with the base (2) formation inner hollow sealing knot
Structure, the wiring board (3) is arranged on the base (2) and in the sealing structure；
The wiring board (3) is provided with current type element circuit, and the current type element circuit is being located at the optical filter F just
Lower section, the positive supply input of the current type element circuit is electrically connected with external power source positive pole V+, negative supply input with it is outer
Portion positive source V- is electrically connected, and the output end of the current type element circuit externally exports detectable signal.
2. the quick response pyroelectric detector according to claim 1 based on current type, it is characterised in that：The electric current
Formula element circuit includes pyroelectric sensing circuit and amplification feedback circuit, and the pyroelectric sensing circuit is connected electrically in the amplification
Between two inputs of feedback circuit, the output end of the amplification feedback circuit externally exports detectable signal.
3. the quick response pyroelectric detector according to claim 2 based on current type, it is characterised in that：The heat is released
Electric induction circuit uses relaxor ferroelectric monocrystal PIMNT pyroelectricity chips U.
4. the quick response pyroelectric detector according to claim 2 based on current type, it is characterised in that：The amplification
Feedback circuit includes operational amplifier A, feedback resistance RfWith feedback capacity Cf, the positive supply input of the operational amplifier A with
External power source positive pole V+ is electrically connected, and negative supply input is electrically connected with external power source positive pole V-, and the pyroelectric sensing circuit connects
It is connected between the in-phase input end of the operational amplifier A and inverting input, the feedback resistance RfWith feedback capacity CfIt is in parallel
Between the inverting input and output end of the operational amplifier A, the in-phase input end ground connection of the operational amplifier A is defeated
Go out end externally output detectable signal.
5. the quick response pyroelectric detector according to claim 4 based on current type, it is characterised in that：The computing
Amplifier A uses unencapsulated operational amplifier chip, the feedback resistance RfUsing insulating pad resistance, the feedback capacity
CfUsing NPO ceramic condensers；
Wherein, the feedback resistance RfTemperature coefficient be less than or equal to 1000PPM/K, Standard resistance range be 10-100G Ω.
6. the quick response pyroelectric detector according to claim 4 based on current type, it is characterised in that：Also include outstanding
Empty support frame (4), the flying shore frame (4) is arranged on the base (2), and forms heat-insulation chamber, institute with the base (2)
Pyroelectric sensing circuit is stated vacantly to be arranged on the wiring board (3) by the flying shore frame (4).
7. the quick response pyroelectric detector based on current type according to any one of claim 1 to 5, its feature exists
In：The wiring board (3) is made up of alumina ceramic material.
8. the quick response pyroelectric detector based on current type according to any one of claim 1 to 5, its feature exists
In：Pipe cap (1) surface is coated with nickel dam, and base (2) surface is coated with layer gold.
9. the quick response pyroelectric detector based on current type according to any one of claim 1 to 5, its feature exists
In：The quantity of the window of pipe cap (1) upper surface, optical filter F and current type element circuit be two and more than, and three
Quantity is equal, and the optical filter F is embedded in the window correspondingly, and the current type element circuit is arranged on the line
On road plate (3), and immediately below the corresponding optical filter F.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720047514.1U CN206378206U (en) | 2017-01-16 | 2017-01-16 | A kind of quick response pyroelectric detector based on current type |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720047514.1U CN206378206U (en) | 2017-01-16 | 2017-01-16 | A kind of quick response pyroelectric detector based on current type |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206378206U true CN206378206U (en) | 2017-08-04 |
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ID=59403745
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201720047514.1U Active CN206378206U (en) | 2017-01-16 | 2017-01-16 | A kind of quick response pyroelectric detector based on current type |
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| CN (1) | CN206378206U (en) |
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2017
- 2017-01-16 CN CN201720047514.1U patent/CN206378206U/en active Active
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