CN202372441U - Non-dispersive infrared pyroelectricity gas sensor for voltage differential output - Google Patents
Non-dispersive infrared pyroelectricity gas sensor for voltage differential output Download PDFInfo
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- CN202372441U CN202372441U CN 201120549583 CN201120549583U CN202372441U CN 202372441 U CN202372441 U CN 202372441U CN 201120549583 CN201120549583 CN 201120549583 CN 201120549583 U CN201120549583 U CN 201120549583U CN 202372441 U CN202372441 U CN 202372441U
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Abstract
The utility model discloses a non-dispersive infrared pyroelectricity gas sensor for voltage differential output. The non-dispersive infrared pyroelectricity gas sensor comprises a measuring channel, a reference channel and two sensitive element chips which correspond to the two channels; one ends of the two sensitive element chips are grounded after the polarities of the two sensitive element chips are oppositely connected in parallel or in series, and the other ends of the two sensitive element chips are connected with a grid electrode of a field-effect tube. A reference signal and a measuring signal are made into sensitive elements with the opposite polarities; the sensitive elements are structurally connected in parallel or in series, thereby differential signals of two optical spectrums are obtained from an output end, and the sensitive element chips with the opposite polarities act on a grid electrode of the field-effect tube; a source electrode of the field-effect tube outputs subtraction signals of the two sensitive elements; the subtraction operation is finished through the series-opposing connection or inverse parallel connection through the sensitive elements, thereby the post-processing operation requirement is reduced; simultaneously useful differential signals are output by an output end without fixed components; and the requirement on a follow-up amplifier or ADC (Analog to Digital Converter) can be greatly reduced, thereby the cost of the whole machine is greatly reduced.
Description
Technical field
The utility model relates to a kind of not beam split infrared thermal release electric infrared sensor, relates in particular to a kind of not beam split infrared thermal release electric gas sensor of voltage differential output, belongs to sensor technical field.
Background technology
When infrared light passed through gas to be measured, these gas molecules had absorption to the infrared light of specific wavelength, and it absorbs relation and obeys lambert--Bill (Lambert-Beer) absorption law.If incident light is a directional light, its intensity is I
0, the outgoing light intensity is I, and the thickness of gas medium is L, and gas concentration is c, absorption coefficient μ, then:
I=I
0exp(-μcL)
Light intensity is pressed the index law decay with concentration c and thickness L in gas medium.Absorption coefficient depends on gas characteristic, and the absorption coefficient μ of all gases is different.
Based on this principle; When measuring, adopts pyroelectric infrared sensor two spectrum channels usually; Through the bandpass filter of two different spectrum is set on the sensor pipe cap, form one and measure passage and a reference channel, measuring the passage middle infrared (Mid-IR) can be by gas absorption decay to be measured; And the direct penetrating mistake of reference channel middle infrared (Mid-IR) can not be absorbed.Carry out subtraction or division arithmetic through data again, extract small useful signal, can weaken or eliminate simultaneously influences such as some disturbing factors such as light source stability, temperature, humidity two passages.
Traditional not beam split infrared thermal release electric gas sensor adopts two independently channel C hannel1, Channel2, and each passage all has responsive element chip and FET FET1, FET2 or the IC amplifier of oneself; As shown in Figure 1, two paths of signals carries out signal Processing, amplification filtering through external amplifier; Carry out subtraction or division arithmetic then, the shortcoming of this processing mode is: because absorption coefficient or concentration are when very little, the overwhelming majority is a fixed signal in the signal; And useful signal to be measured is very little, in order to reach certain resolution, if adopt analog form; Need to amplify earlier the two independent signal, the computing of subtracting each other then or being divided by, the precision and the stability requirement of the amplifier of using for amplification message are very high; If the employing digital signal then needs high-order ADC, cost is higher.
The utility model content
The utility model technical matters to be solved provides a kind of not beam split infrared thermal release electric gas sensor of voltage differential output; Structure is simpler; Reduced output terminal; Can cancel amplifier or ADC, perhaps adopt the ADC of not high amplifier of precision, stability requirement and low order bit, reduce the complete machine cost.
For solving the problems of the technologies described above, the utility model provides a kind of not beam split infrared thermal release electric gas sensor of voltage differential output, comprises to measure passage and reference channel and reach two responsive element chips with two corresponding settings of passage; It is characterized in that; Described two responsive element chip polarity on the contrary, parallel connection or be connected in series, connect back one end ground connection, the other end is connected with the grid of a FET; The source electrode of said FET is an output terminal, and drain electrode adds power supply voltage.
Described two responsive element chip polarity are connected in series on the contrary, constitute a series connection circuit, two ends parallel connection one resistance of said series circuit.
Described two responsive element chip polarity are connected in parallel on the contrary, constitute a parallelly connected circuit, two ends parallel connection one resistance of said parallel circuit.
Described two responsive element chip polarity are connected in series on the contrary and constitute a series connection circuit; Two other responsive element chip unit by way of compensation of connecting again between two said responsive element chips in said series circuit, said compensation is first, and said responsive element chip polarity with adjacent is opposite respectively.
Described two responsive element chip polarity are connected in parallel on the contrary and constitute a parallelly connected circuit; Another responsive element chip unit by way of compensation of connecting again in each bar branch road of said parallel circuit, the said responsive element chip polarity in the branch road at said compensation unit and place is opposite.
The beneficial effect that the utility model reached:
The not beam split infrared thermal release electric gas sensor of the utility model is made opposite polarity responsive unit with reference signal and measuring-signal on chip; Structurally carrying out parallel connection perhaps is connected in series; Thereby obtain the difference signal of two spectrum from an output terminal; Two opposite polarity responsive element chips act on the fet gate, the subtracted signal of these two the responsive units of source electrode output of FET, and its advantage is; Subtraction is accomplished through responsive first differential concatenation or reverse parallel connection, has reduced the post processing operations needs; Simultaneously, output terminal output be exactly useful difference signal, do not have fixed component, can reduce greatly the requirement of follow up amplifier or ADC, thereby reduce the complete machine cost greatly.
Description of drawings
Fig. 1 is a pyroelectricity gas sensor circuit diagram of the prior art;
Fig. 2 is the utility model embodiment 1 not beam split of differential concatenation binary channels infrared thermal release electric detection of gas sensor circuit figure;
Fig. 3 is the utility model embodiment 2 not beam split of reverse parallel connection binary channels infrared thermal release electric detection of gas sensor circuit figure;
Fig. 4 is that the utility model embodiment 3 has compensation not beam split of the binary channels infrared thermal release electric detection of gas sensor circuit figure that connects firstly;
Fig. 5 is parallelly connected not beam split of the binary channels infrared thermal release electric detection of gas sensor circuit figure that the utility model embodiment 4 has compensation unit.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.Following examples only are used for more clearly explaining the technical scheme of the utility model, and can not limit the protection domain of the utility model with this.
As shown in Figure 2; Comprise in the not beam split infrared thermal release electric gas sensor chip of the voltage differential of the utility model output and measure channel C hannel1 and reference channel Channel2, with two responsive element chip S1, S2 that two difference measurement of inductance signals and reference signal are set that passage is corresponding, two responsive element chip S1, S2 polarity are opposite; Differential concatenation; Make the negative pole of responsive element chip S1, S2 relative, the anodal end ground connection Gnd/Case of one of them responsive element chip S2 of series connection back, the anodal end of another responsive element chip S1 is connected with the grid of FET FET; The source S ource of FET FET is an output terminal, and drain D rain adds power supply voltage.Two opposite polarity responsive element chip S1, S2 act on the FET FET grid, the subtracted signal of these two responsive units of the source S ource of FET output.
Thereby obtain the difference signal of reference signal and two wave bands of measuring-signal from an output terminal, signal directly just carries out difference and subtracts each other when producing, and subtraction is accomplished through responsive element chip differential concatenation.
In other embodiments, also can be in the connected mode of Fig. 2, two responsive element chip S1, S2 are all reverse, just become relatively anodally, still constitute opposite polarity series connection, all the other structures are constant, can reach above-mentioned effect equally.
Embodiment 2
As shown in Figure 3; Comprise in the not beam split infrared thermal release electric gas sensor chip of the voltage differential output of the utility model and measure channel C hannel1 and reference channel Channel2; With two responsive element chip S1, S2 that two difference measurement of inductance signals and reference signal are set that passage is corresponding; Two responsive element chip S1, S2 polarity are connected in parallel on the contrary, parallel connection back one end ground connection Gnd/Case, and the other end is connected with the grid of FET FET; The source S ource of FET FET is an output terminal, and drain D rain adds power supply voltage.
Thereby obtain the difference signal of reference signal and two wave bands of measuring-signal from an output terminal, signal directly just carries out difference and subtracts each other when producing, and subtraction is accomplished through responsive first reverse parallel connection.
Embodiment 3
As shown in Figure 4; On the basis of embodiment 1, improve; Two responsive element chips unit by way of compensation of between the responsive element chip S1 of differential concatenation, S2, connecting again; One of them compensation unit and responsive element chip S1 differential concatenation, another compensates unit and responsive element chip S2 differential concatenation, compensates the measuring-signal and the reference signal of responsive element chip S1, S2 induction respectively.
All the other are identical with enforcement 1.
Embodiment 4
As shown in Figure 5; On the basis of embodiment 2, improve; The responsive element chip unit by way of compensation of in every parallel branch of the responsive element chip S1 of reverse parallel connection, S2, connecting again; Responsive element chip S1 or responsive element chip S2 differential concatenation in compensation unit in every parallel branch and the parallel branch at its place compensate responsive element chip S1 or the measuring-signal and the reference signal of responsive element chip S2 induction in the parallel branch at its place respectively.
All the other and embodiment 2 are identical.
Above-mentioned sensitive components/chip can adopt any material with pyroelectric property, for example: PZT, lithium tantalate etc.
The above only is the preferred implementation of the utility model; Should be understood that; For those skilled in the art; Under the prerequisite that does not break away from the utility model know-why, can also make some improvement and distortion, these improvement and distortion also should be regarded as the protection domain of the utility model.
Claims (5)
1. the not beam split infrared thermal release electric gas sensor of voltage differential output; Comprise measure passage and reference channel and with two responsive element chips of two corresponding settings of passage, it is characterized in that, described two responsive element chip polarity on the contrary, parallelly connected or be connected in series; Connect back one end ground connection; The other end is connected with the grid of a FET, and the source electrode of said FET is an output terminal, and drain electrode adds power supply voltage.
2. the not beam split infrared thermal release electric gas sensor of a kind of voltage differential output according to claim 1 is characterized in that described two responsive element chip polarity are connected in series on the contrary, constitutes a series connection circuit, two ends parallel connection one resistance of said series circuit.
3. the not beam split infrared thermal release electric gas sensor of a kind of voltage differential output according to claim 1 is characterized in that described two responsive element chip polarity are connected in parallel on the contrary, constitute a parallelly connected circuit, two ends parallel connection one resistance of said parallel circuit.
4. the not beam split infrared thermal release electric gas sensor of a kind of voltage differential output according to claim 1; It is characterized in that; Described two responsive element chip polarity are connected in series on the contrary and constitute a series connection circuit; Two other responsive element chip unit by way of compensation of connecting again between two said responsive element chips in said series circuit, said compensation is first, and said responsive element chip polarity with adjacent is opposite respectively.
5. the not beam split infrared thermal release electric gas sensor of a kind of voltage differential output according to claim 1; It is characterized in that; Described two responsive element chip polarity are connected in parallel on the contrary and constitute a parallelly connected circuit; Another responsive element chip unit by way of compensation of connecting again in each bar branch road of said parallel circuit, the said responsive element chip polarity in the branch road at said compensation unit and place is opposite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120549583 CN202372441U (en) | 2011-12-26 | 2011-12-26 | Non-dispersive infrared pyroelectricity gas sensor for voltage differential output |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120549583 CN202372441U (en) | 2011-12-26 | 2011-12-26 | Non-dispersive infrared pyroelectricity gas sensor for voltage differential output |
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| Publication Number | Publication Date |
|---|---|
| CN202372441U true CN202372441U (en) | 2012-08-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120549583 Expired - Lifetime CN202372441U (en) | 2011-12-26 | 2011-12-26 | Non-dispersive infrared pyroelectricity gas sensor for voltage differential output |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102445432A (en) * | 2011-12-26 | 2012-05-09 | 江苏科融电子技术有限公司 | Nondispersive infrared heat-release electric gas sensor of voltage differential output |
-
2011
- 2011-12-26 CN CN 201120549583 patent/CN202372441U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102445432A (en) * | 2011-12-26 | 2012-05-09 | 江苏科融电子技术有限公司 | Nondispersive infrared heat-release electric gas sensor of voltage differential output |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120808 |
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| CX01 | Expiry of patent term |