CN201397162Y - Micro-flow detector and infrared analyzer provided with micro-flow detector - Google Patents
Micro-flow detector and infrared analyzer provided with micro-flow detector Download PDFInfo
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- CN201397162Y CN201397162Y CN 200920056547 CN200920056547U CN201397162Y CN 201397162 Y CN201397162 Y CN 201397162Y CN 200920056547 CN200920056547 CN 200920056547 CN 200920056547 U CN200920056547 U CN 200920056547U CN 201397162 Y CN201397162 Y CN 201397162Y
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Abstract
The utility model relates to the detection field and discloses a micro-flow detector and an infrared analyzer provided with the micro-flow detector. The detector comprises a constant current power supply, a thermistor, a first resistance, a second resistance and a third resistance, wherein, the thermistor is connected in series with the first resistance to form a first series group; the second resistance is connected in series with the third resistance to form a second series group; the first and second series groups are electrically connected in parallel between two power supply electrodes ofthe constant current power supply; a current detection device is electrically connected between a first series point and a second series point; the first series point is an electrical connection point between the thermistor and the first resistance; the second series point is an electrical connection point between the second resistance and the third resistance; and at least one resistance of thefirst, second and third resistances is an adjustable resistance. Adopting the infrared analyzer can realize to measure gas concentration through measuring the gas flow, and the infrared analyzer has less volume.
Description
Technical field
The utility model relates to detection range, relates in particular to a kind of micrometeor detecting device and with the infrared spectrum analyser of this micrometeor detecting device.
Background technology
Along with the development of the development of optics, particularly infrared optics, infrared light is widely used in environment detection, particularly in the detection of gas.
Figure 1 shows that the structural principle synoptic diagram of a kind of infrared spectrum analyser of the prior art.This infrared spectrum analyser comprises a pointolite 101, below this pointolite 101, be provided with a beam splitter 103, below beam splitter 103, be provided with all mating plates 104, this cuts mating plate 104 can be by motor 105 driven rotary, cut mating plate 104 below be respectively arranged with and measure air chamber 105, reference air chamber 106, be equipped with detected sample gas in this measurement air chamber 105, be equipped with reference gas in reference air chamber 106, this reference gas is selected inert gas usually for use.Below measurement air chamber 105, reference air chamber 106, be respectively arranged with to measure and receive air chamber 107, reference reception air chamber 108, be respectively applied for and receive measure detected sample gas and the reference gas that air chamber 105, reference air chamber 106 enter, measure receive air chamber 107, reference receives between the air chamber 108 and is provided with thin-film capacitor detecting device 109 (a kind of detecting device).
Its principle of work is, pointolite 101 sends the very narrow infrared ray of spectral line, usually have only about several to dozens of nanometers, infrared light is through the red light beam 1031 that obtains of beam splitter 103 beam split, light beam 1032 two-way light paths, light beam 1031, light beam 1032 is respectively by cutting mating plate 104, cut mating plate 104 rotation vertically under the drive of motor 105, cut mating plate 104 and be provided with interference filter sheet 107, this interference filter sheet 107 is arranged on the top of measuring air chamber 105, when light beam 1031 passes through interference filter sheet 107, interference filter sheet 107 becomes optical modulation the infrared beam of different wave length, cut light action adding the rotation of cutting mating plate 104, thereby reach: cut mating plate 104 and be sent to detecting device in turn, realize temporal double light path from effect.
Light beam 1032 (reference beam) is by being full of the reference air chamber of reference gas (such as nitrogen), and the arrival reference without decay receives air chamber then.The measurement air chamber of light beam 1031 (measuring beam) by flowing, and produce more or less decay because the concentration difference of gas according to the difference of sample gas concentration, the attenuation degree difference of the light of this gas of process, be arranged on to measure and receive air chamber 107, the thin-film capacitor detecting device 109 that reference receives air chamber 108 is subjected to receive measurement air chamber 105, the light beam 1031 that the reference gas receiving chamber is come out, the influence of the energy of light beam 1032, produce the electric signal relevant with luminous energy, cut the mating plate 104 periodic light beams that cut off, thereby export periodic electric signal at electrical signal, the user calculates the luminous energy damping capacity according to this electric signal, thereby calculates the concentration of measuring the detected sample gas in the air chamber 105 according to damping capacity then.
Realize concentration at a kind of thin-film capacitor detecting device 109 of adopting of existing infrared analysis, but because itself there is the inherent shortcoming of zero point drift in thin-film capacitor detecting device 109, cause the error measured bigger according to the attenuation measurement gas of light.
And the volume of thin-film capacitor detecting device 109 itself is bigger, makes that the volume of the infrared spectrum analyser of using this thin-film capacitor detecting device 109 in the prior art is relatively also bigger.
The utility model content
The utility model embodiment provides a kind of micrometeor detecting device, gas stream can be changed into the electric signal that can survey.
The utility model embodiment provides a kind of infrared spectrum analyser, can realize the measurement to gas concentration by the test to gas stream, and volume is less.
A kind of micrometeor detecting device that the utility model embodiment provides comprises: constant-current supply, thermistor, first resistance, second resistance, the 3rd resistance; Wherein,
Described thermistor and described first resistance are in series, and form the first series connection group;
Described second resistance and described the 3rd resistance are in series, and form the second series connection group;
The described first series connection group, the second series connection group parallel connection are connected electrically between two transmitting electrodes of described constant-current supply;
Between first series connection point, second series connection point, also be electrically connected with amplifier, described amplifier is used to export the voltage signal between described first series connection point, second series connection point, wherein, described first series connection point is: the electric connection point between described thermistor and described first resistance, described second series connection point is: the electric connection point between described second resistance and described the 3rd resistance.
Alternatively, described thermistor is: palisade nickel wire resistance.
Alternatively, described thermistor is: platinum filament resistance.
A kind of micrometeor detecting device that the utility model embodiment provides, a kind of infrared spectrum analyser comprises infrared light supply, is provided with to cut mating plate below described light source, the described mating plate of cutting is provided with the interference filter sheet, and described interference filter sheet is positioned at the top that described measurement receives air chamber;
Described cut mating plate below be respectively arranged with measure to receive air chamber, reference receives air chamber, receives in the air chamber in described measurement and is equipped with detected sample gas, is provided with reference gas in described reference receives air chamber,
Receive between the air chamber and be provided with gas channel at described measurement reception air chamber, reference,
This infrared spectrum analyser also comprises the above-mentioned arbitrary described micrometeor detecting device of right,
Wherein, described thermistor is arranged in the described gas channel.
Alternatively, described reference gas is an inert gas.
Alternatively, described reference gas is a nitrogen.
Alternatively, described infrared light supply is: planar light source.
Alternatively, also be provided with the second interference filter sheet on the mating plate described cutting, the described second interference filter sheet is positioned at the top that described reference receives air chamber.
Therefore the technical scheme of application the utility model embodiment is when air-flow process thermistor Rx, air-flow is taken away the heat on the thermistor Rx, the resistance of thermistor Rx is changed, and electric bridge generation current compensation in this micrometeor detecting device 410 is to make bridge balance by compensation.Can be by the compensating current signal of amplifier G output, ask the change in resistance amount of current thermistor Rx, because the change in resistance amount of Rx is relevant with air flow rate, so this micrometeor of application detecting device can record air flow rate by electric signal.
The micrometeor pick-up unit of present embodiment is applied in various test occasions, can calculates other amounts relevant according to gas flow with this gas flow.
In addition, the circuit structure of this micrometeor detecting device is simple, and volume is little, is convenient to use.
In infrared spectrum analyser, use this micrometeor detecting device,, can determine the gas concentration of detected sample gas according to air flow rate and tested gas correlativity to ultrared degree of absorption.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present utility model, constitutes the application's a part, does not constitute to improper qualification of the present utility model, in the accompanying drawings:
Fig. 1 is the structural principle synoptic diagram of a kind of infrared spectrum analyser of the prior art;
The circuit principle structure figure of a kind of micrometeor detecting device that Fig. 2 provides for the utility model embodiment 1;
Fig. 3 is the position view of micrometeor detecting device in infrared spectrum analyser shown in Figure 2 among the utility model embodiment 1;
The structural representation of a kind of infrared spectrum analyser that Fig. 4 provides for the utility model embodiment 2;
The structural representation of the another kind of infrared spectrum analyser that Fig. 5 provides for the utility model embodiment 2;
Embodiment
Describe the utility model in detail below in conjunction with accompanying drawing and specific embodiment, be used for explaining the utility model in this illustrative examples of the present utility model and explanation, but not as to qualification of the present utility model.
Embodiment 1:
Referring to shown in Figure 2, a kind of micrometeor detecting device 410 that present embodiment provides comprises: constant-current supply E, thermistor Rx, first resistance R 1, second resistance R 2, the 3rd resistance R 3.Its concrete annexation is specific as follows:
The thermistor Rx and first resistance R 1 are in series at the first series connection point B, form the first series connection group;
Second resistance R 2 and the 3rd resistance R 3 are in series at the second series connection point D, form the second series connection group;
The first series connection group, the second series connection group are in parallel at electric connection point A, electric connection point C, and parallel circuit is connected between two transmitting electrodes of constant-current supply E;
Also be electrically connected with amplifier G between the first series connection point B, the second series connection point D, this amplifier G is used to export the voltage signal between the first series connection point B, the second series connection point D.
Wherein, above-mentioned thermistor Rx can but be not limited to: palisade nickel wire resistance or platinum filament resistance.
Below the principle of work of this micrometeor detecting device 410 is elaborated:
In the circuit of the micrometeor detecting device 410 of present embodiment, during bridge balance shown in Figure 1, the electric potential difference between the first series connection point B, the second series connection point D is zero volt, and the electric current of output is zero.
When bridge balance:
Voltage between electric connection point A, the B equates with voltage between electric connection point A, the D:
UAB＝UAD；
Voltage between electric connection point B, the C equates with voltage between electric connection point D, the C:
UBC＝UDC；
That is:
I1 Rx1=I3 R1, functional expression (1);
I2 Rx2=I I4 R2, functional expression (2);
Wherein, I1 is the electric current that flows through thermistor Rx, and I2 is the electric current that flows through first resistance R 1, and I3 is the electric current that flows through second resistance R 2, and I4 is the electric current that flows through the 3rd resistance R 3.
Because during bridge balance, current detector G no current passes through, and following current relationship is arranged:
I1＝I2，I3＝I4，
Utilize above-mentioned current relationship, make functional expression (1), (2) be divided by, obtain following relational expression:
Rx1/R?X2＝R1/R2，
Can be in the hope of the resistance of Rx:
Rx＝R1*R?1/R2。
When using, can switch on earlier this micrometeor detecting device 410 is carried out preheating, make thermistor Rx have certain temperature, when air-flow process thermistor Rx, air-flow is taken away the heat on the thermistor Rx, the resistance of thermistor Rx is changed, electric bridge generation current compensation in this micrometeor detecting device 410 is to make bridge balance by compensation.
Can be by the compensating current signal of amplifier G output, ask the change in resistance amount of current thermistor Rx, because the change in resistance amount of Rx is relevant with air flow rate, so this micrometeor of application detecting device can record air flow rate by electric signal.
The micrometeor pick-up unit of present embodiment is applied in various test occasions, can calculates other amounts relevant according to gas flow with this gas flow.
In addition, the circuit structure of this micrometeor detecting device is simple, and volume is little, is convenient to use.
Following examples 2 will be to be applied to a kind of example in the infrared spectrum analyser with above-mentioned micrometeor detecting device 410, and the application in infrared acquisition is described in detail to this micrometeor detecting device 410.
Embodiment 2:
Below with the micrometeor detector applies in the Application Example 1 in infrared spectrum analyser:
Fig. 3,4,5 are respectively the structural representation of a kind of infrared spectrum analyser that present embodiment provides, referring to diagram, the infrared spectrum analyser of present embodiment mainly comprises: infrared light supply (401,501), at infrared light supply (401,501) below is respectively arranged with cuts mating plate 404, this is cut mating plate 404 and is electrically connected with motor, can under the driving of motor, be rotated, cut mating plate 404 below be provided with and measure air chamber 408, reference air chamber 409, wherein, measure in the air chamber 408 mobile detected sample gas is arranged, in the reference air chamber, be provided with reference gas and (generally select inert gas for use, such as N2), measuring air chamber 408, the below of reference air chamber 409 is respectively arranged with to measure and receives air chamber 408, reference receives air chamber 409, wherein measuring reception air chamber 408 is designed to two-layer up and down, what its inside was filled with specific concentrations treats test sample gas component, receives air chamber 408 measuring, reference receives between the air chamber 409 and is provided with gas channel 301, is provided with the thermistor Rx of micrometeor detecting device in this gas channel.
The principle of work that this infrared analysis rises is:
The narrower infrared light of spectral line that infrared light supply (401,501) sends, general, its wavelength coverage has only about several to dozens of nanometers usually, its boundling can be become focal plane arrays (FPA) form multispectral band spectrum.
Wherein, referring to shown in Figure 4, infrared light supply 401 in the present embodiment is an electric light source, it sends single bundle infrared light, below this infrared light supply 401, be provided with beam splitter 402, this beam splitter 402 is separated into two bundle infrared lights 403,402 with single bundle infrared light that infrared light supply 401 sends, and makes this two bundle infrared respectively through cutting mating plate 404.
Wherein, referring to shown in Figure 5, the infrared light supply in the present embodiment is a focal plane matrix light source, and it sends parallel multispectral band infrared spectrum, and its parallel light ground is through cutting mating plate 404.
Cutting mating plate 404 is electrically connected with motor, under the drive of motor 405, be rotated, and to cutting through the infrared light of originally cutting mating plate, cut mating plate 404 and be provided with interference filter sheet 4041, this interference filter sheet 4041 is arranged on the top of measuring air chamber 406, utilizes modulation to cut the interference filter sheet of mating plate 406, optical modulation is become the infrared beam of different wave length, be sent to detecting device in turn, realize temporal double light path.
Light beam is by being full of the reference air chamber of reference gas, and the arrival reference without decay receives air chamber then.Simultaneously, the measurement air chamber 409 of light beam light beam by flowing, and arrive to measure according to the difference generation decay back more or less of the concentration of measurement gas and receive air chamber 408, the preferential measured air chamber of the light in spectral absorption wave band centre position absorbs, and the measured reception air chamber 408 (upper strata air chamber 4081 and lower floor's air chamber 4082) of the almost same degree of the light of edge wave band absorbs, and upper strata air chamber 4081, lower floor's air chamber 4082 link together by gas channel 301 (wherein being provided with micrometeor detecting device 410).
Cut mating plate 404 alternately, cut off light beam periodically, there is infrared light to be absorbed if measure reception air chamber 408, in gas channel 301, just there is an air pulse to be detected so by micrometeor detecting device 410, micrometeor detecting device 410 is converted into the output terminal output of an electric signal at amplifier, can determine gas flow according to this electric signal, and because gas flow is relevant with the decay of infrared beam, the decay of infrared beam is relevant with the gas concentration for the treatment of test sample gas in measure receiving air chamber 408, so can determine to treat in the measurement reception air chamber 408 concentration of test sample gas according to gas flow.
Wherein, the principle of work of micrometeor detecting device 410 can be referring to the corresponding description of a kind of embodiment.
Because the circuit structure of the micrometeor detecting device 410 in the present embodiment mainly is made up of resistance, its volume can significantly reduce with respect to the applied film capacitance detector in the prior art, thus in infrared spectrum analyser this trace of application
Referring to shown in Figure 5, can adopt the light source of planar light source 501 in the present embodiment as present embodiment, like this, can not need as shown in Figure 4: enter respectively to measure and receive air chamber 408, reference reception air chamber 409 owing to the light that uses pointolite 401 to need to use beam splitter 402 that pointolite 401 is sent is divided into two bundles, use infrared spectrum analyser shown in Figure 5, help further saving cost, reduce the volume of equipment.
In addition, use planar light source 501 to also help the consistance of protecting light source, and make light beam enter to measure receive air chamber 408, reference receives air chamber 409 and has incident angle preferably.
In addition, in order to make the structure of this infrared spectrum analyser more compact, can treat that test sample gas provides the measurement air chamber 406 of detected sample gas to measuring reception air chamber 408 with being used to store, and store reference gas and provide the reference air chamber 407 of reference gas to be separately positioned on and measure the top that receives air chamber 408 and reference reception air chamber 409 to reference reception air chamber 409.
More than technical scheme that the utility model embodiment is provided be described in detail, used specific case herein principle and the embodiment of the utility model embodiment are set forth, the explanation of above embodiment only is applicable to the principle that helps to understand the utility model embodiment; Simultaneously, for one of ordinary skill in the art, according to the utility model embodiment, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as restriction of the present utility model.
Claims (8)
1, a kind of micrometeor detecting device is characterized in that, comprising: constant-current supply, thermistor, first resistance, second resistance, the 3rd resistance; Wherein,
Described thermistor and described first resistance are in series, and form the first series connection group;
Described second resistance and described the 3rd resistance are in series, and form the second series connection group;
The described first series connection group, the second series connection group parallel connection are connected electrically between two transmitting electrodes of described constant-current supply;
Between first series connection point, second series connection point, also be electrically connected with amplifier, described amplifier is used to export the voltage signal between described first series connection point, second series connection point, wherein, described first series connection point is: the electric connection point between described thermistor and described first resistance, described second series connection point is: the electric connection point between described second resistance and described the 3rd resistance.
2, micrometeor detecting device according to claim 1 is characterized in that,
Described thermistor is: palisade nickel wire resistance.
3, micrometeor detecting device according to claim 1 is characterized in that,
Described thermistor is: platinum filament resistance.
4, a kind of infrared spectrum analyser comprises infrared light supply, is provided with to cut mating plate below described light source, and the described mating plate of cutting is provided with the interference filter sheet, and described interference filter sheet is positioned at the top that described measurement receives air chamber;
Described cut mating plate below be respectively arranged with measure to receive air chamber, reference receives air chamber, receives in the air chamber in described measurement and is equipped with detected sample gas, is provided with reference gas in described reference receives air chamber,
Receive between the air chamber and be provided with gas channel at described measurement reception air chamber, reference, it is characterized in that,
This infrared spectrum analyser also comprises the arbitrary described micrometeor detecting device of claim 1 to 4,
Wherein, described thermistor is arranged in the described gas channel.
5, infrared spectrum analyser according to claim 4 is characterized in that, described reference gas is an inert gas.
6, infrared spectrum analyser according to claim 5 is characterized in that, described reference gas is a nitrogen.
7, infrared spectrum analyser according to claim 4 is characterized in that, described infrared light supply is: planar light source.
8, infrared spectrum analyser according to claim 4 is characterized in that, also is provided with the second interference filter sheet on the mating plate described cutting, and the described second interference filter sheet is positioned at the top that described reference receives air chamber.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200920056547 CN201397162Y (en) | 2009-05-14 | 2009-05-14 | Micro-flow detector and infrared analyzer provided with micro-flow detector |
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| CN 200920056547 CN201397162Y (en) | 2009-05-14 | 2009-05-14 | Micro-flow detector and infrared analyzer provided with micro-flow detector |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590126A (en) * | 2011-12-28 | 2012-07-18 | 武汉四方光电科技有限公司 | Long-life micro-flow infrared sulfur dioxide (SO2) sensor |
| CN102809546A (en) * | 2012-08-21 | 2012-12-05 | 南京埃森环境技术有限公司 | Low-concentration flue gas infra-red analyzer and detection method |
| CN104792378A (en) * | 2014-01-17 | 2015-07-22 | 无锡华润上华半导体有限公司 | Infrared gas concentration meter, micro flow sensor, temperature sensitive resistor structure and manufacturing method thereof |
| CN109269580A (en) * | 2018-11-27 | 2019-01-25 | 河北大学 | A kind of hough transform device and method for two-phase flow |
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2009
- 2009-05-14 CN CN 200920056547 patent/CN201397162Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590126A (en) * | 2011-12-28 | 2012-07-18 | 武汉四方光电科技有限公司 | Long-life micro-flow infrared sulfur dioxide (SO2) sensor |
| CN102809546A (en) * | 2012-08-21 | 2012-12-05 | 南京埃森环境技术有限公司 | Low-concentration flue gas infra-red analyzer and detection method |
| CN104792378A (en) * | 2014-01-17 | 2015-07-22 | 无锡华润上华半导体有限公司 | Infrared gas concentration meter, micro flow sensor, temperature sensitive resistor structure and manufacturing method thereof |
| WO2015106607A1 (en) * | 2014-01-17 | 2015-07-23 | 无锡华润上华半导体有限公司 | Gas concentration meter, micro-flow sensor, temperature-sensitive resistor structure and manufacturing method therefor |
| CN104792378B (en) * | 2014-01-17 | 2018-04-06 | 无锡华润上华科技有限公司 | Infrared-gas densimeter, microfluidic sensor, thermo-sensitive resistor structure and its manufacture method |
| CN109269580A (en) * | 2018-11-27 | 2019-01-25 | 河北大学 | A kind of hough transform device and method for two-phase flow |
| CN109269580B (en) * | 2018-11-27 | 2023-12-12 | 河北大学 | Rectangular detection device and method for two-phase flow detection |
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Granted publication date: 20100203 Termination date: 20120514 |