CN201811920U - Gas measuring device - Google Patents
Gas measuring device Download PDFInfo
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- CN201811920U CN201811920U CN 201020559901 CN201020559901U CN201811920U CN 201811920 U CN201811920 U CN 201811920U CN 201020559901 CN201020559901 CN 201020559901 CN 201020559901 U CN201020559901 U CN 201020559901U CN 201811920 U CN201811920 U CN 201811920U
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- gas
- catoptron
- gas measuring
- light
- reflector
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Abstract
The utility model relates to a gas measuring device which comprises a light source, an optical detector for detecting the intensity of light rays, a first reflector, a second reflector, and a first gas measuring chamber and a second gas measuring chamber for accommodating gas to be measured, wherein the first gas measuring chamber is communicated with the second gas measuring chamber; the light source and the first reflector are arranged in the first gas measuring chamber; the optical detector and the second reflector are arranged in the second gas measuring chamber; the first reflector forms an included angle with the second reflector; the light rays emitted by the light source pass through the first gas measuring chamber, and after being reflected by the first reflector and the second reflector, the light rays pass through the second gas measuring chamber to enter the optical detector. The gas measuring device detects the intensity of light rays passing through two gas measuring chambers, the optical path is increased, the measuring reliability and sensitivity are improved, and the cost is lower by only using two reflectors and even much lower by using a common light source.
Description
[technical field]
The utility model relates to surveying instrument, particularly a kind of gas measurement device.
[background technology]
In traditional gas analysis system, during the measurement gas composition, allow irradiate light gas, measure light intensity by gas, because different gas is measured different light intensities to the absorption difference of light, and then the analytical gas component.For reliability and the sensitivity that improves measurement gas, traditional measurement gas adopts high light intensity infrared light supply, highly sensitive photometry sensor and increases technology such as electron-amplifier, makes gas analysis equipment price costliness.
[utility model content]
Based on this, be necessary to provide a kind of cost lower and improved the gas measurement device of reliability and sensitivity.
A kind of gas measurement device, the photodetector that comprises light source and detection light intensity, also comprise first catoptron, second catoptron, first gas and second gas of holding measurement gas, described first gas communicates with described second gas, described light source and described first catoptron are located at described first gas, described photodetector and described second catoptron are located at described second gas, described first catoptron and described second catoptron form angle, the light that described light source sends passes described first gas, and, arrive described photodetector through passing described second gas after described first catoptron and described second mirror reflects.
Preferably, described first catoptron and described second catoptron formation angle is 90 degree.
Preferably, described first gas and second gas be arranged in parallel.
Preferably, described light and described first catoptron formation angle is an acute angle.
Preferably, the angle of described light and described first catoptron formation is 45 degree.
Preferably, also comprise the air intake opening of being located at described first gas and the gas outlet of being located at described second gas.
The above-mentioned gas measurement mechanism, adopt the intensity that detects the light that has passed through first gas and second gas, increased light path, improved measuring reliability and sensitivity, and this structural design is simple, only adopts two catoptrons to realize the emission of light, increase light path, cost is lower, adopts ordinary light source to detect than the high light intensity infrared light supply of tradition, and cost is lower.
[description of drawings]
Fig. 1 is the structural representation of gas measurement device among the embodiment.
[embodiment]
Below in conjunction with specific embodiment and accompanying drawing technical scheme is described in detail.
As shown in Figure 1, in one embodiment, a kind of gas measurement device comprises the light source 10 that incident ray is provided, first gas 20 of holding measurement gas and second gas 50, first catoptron 30, second catoptron 40 and photodetector 60.Wherein, first gas 20 communicates with second gas 50, and the light source 10 and first catoptron 30 are located at first gas, 20, the second catoptrons 40 and photodetector 60 is located at second gas 50.First catoptron 30 and second catoptron 40 form angle.The light that light source 10 sends passes first gas 20, and through passing second gas 50 after first catoptron 30 and 40 reflections of second catoptron, arrives photodetector 60.Photodetector 60 can be integrated on the PCBA (Printed Circuit Board Assembly, P.e.c. circuit board).Light source 10 can be ordinary light source.
In the present embodiment, first gas 20 and second gas 50 are rectangular-shaped, communicate and be arranged in parallel.Light source 10 is arranged on light inlet side 210 places of first gas 20, first catoptron 30 is positioned at bright dipping side 220 places of first gas 20, second catoptron 40 and first catoptron, 30 angles are 90 degree, second catoptron 40 is positioned at light inlet side 510 places of second gas 50, second gas 50 communicates and be arranged in parallel with first gas 20, and photodetector 60 is arranged on bright dipping side 520 places of second gas 50.
The angle that first catoptron 30 and second catoptron 40 form is 90 degree, incident ray forms reflection ray through first catoptron 30 and second catoptron, 40 reflection backs, this reflection ray is parallel with incident ray, so, first gas 20 and second gas 50 can communicate and be arranged in parallel, have saved the space of device.
As shown in Figure 1, the above-mentioned gas measurement mechanism also comprises the air intake opening 70 of being located at first gas 20 and the gas outlet 80 of being located at second gas 50.Conveniently carry out gasmetry.
The course of work of above-mentioned gas measurement mechanism is: inject measurement gas in first gas 20 and second gas 50 by air intake opening 70, open light source 10 and send parallel incident ray, incident ray passes after first gas 20 is subjected to gas absorption, shine and pass after first catoptron 30 and the reflection of second catoptron 40 after second gas 50 is subjected to gas absorption, arrive photodetector 60, detected the light intensity of light by photodetector 60.Carry out analytical gas according to the light intensity that detects.After the analysis, the measurement gas of injecting can be discharged by gas outlet 80.
The principle that the above-mentioned gas measurement mechanism is measured is to utilize gas molecule that the infrared light of specific wavelength is had absorption, by measuring by the light intensity after the gas molecule absorption, analyzes.Gas molecule is obeyed lambert-Bill (Lambert-Beer) absorption law to the absorption of light.Suppose that incident light is a directional light, its intensity is I
0, the outgoing light intensity is I, the thickness of gas medium is L.When the light intensity decreasing that causes when the absorption by the molecular number dN in the gas medium is dI, can get according to lambert-Bill's absorption law:
(1) in the formula, K is a proportionality constant.Get through integration:
lnI＝-KN+α (2)
(2) in the formula, N is for absorbing the molecule sum of gas medium; α is an integration constant.Wherein, N ∝ cL, c are gas concentration.Then formula (2) can be written as:
I＝exp(α)exp(-KN)
＝exp(α)exp(-μcL) (3)
＝I
0exp(-μcL)
In the formula (3), μ is the absorption coefficient of gas.Formula (3) shows that light intensity is pressed the index law decay with gas concentration c and thickness L in gas medium.Absorption coefficient depends on gas characteristic, and the absorption coefficient μ of all gases is different.To same gas, μ then becomes with incident wavelength.Absorb gas if contain the i kind in the absorbing medium, then formula (3) should change into:
I＝I
0exp(-L∑μ
ic
i) (4)
For various mixed gases,, need before photodetector 60 or light source 10, to install the narrow band filter slice of a suitable analytical gas absorbing wavelength in order to analyze specific components.
Comprehensive above-mentioned gas measuring principle as can be known, under the certain situation of gas concentration c and absorption coefficient μ, the thickness L of gas medium is big more, light intensity decays more little in gas, photodetector 60 is easy more to be detected.The above-mentioned gas measurement mechanism adopt to detect the intensity of light of the gas medium of the gas medium that passed through first gas 20 and second gas 50, has been equivalent to increase the thickness of gas medium, has improved the reliability and the sensitivity of gasmetry.In addition, adopt two catoptrons to realize the reflection of light, thereby increased light light path in gas medium, simple in structure, cost is lower, and can adopt ordinary light source, cost is lower; Adopt first catoptron 30 and second catoptron, 40 formation an angle of 90 degrees and first gas 20 and second gas 50 to communicate and be arranged in parallel, do not increase the volume of measurement mechanism.
The above embodiment has only expressed several embodiment of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model claim.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the utility model design, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.
Claims (6)
1. gas measurement device, the photodetector that comprises light source and detection light intensity, it is characterized in that, also comprise first catoptron, second catoptron, first gas and second gas of holding measurement gas, described first gas communicates with described second gas, described light source and described first catoptron are located at described first gas, described photodetector and described second catoptron are located at described second gas, described first catoptron and described second catoptron form angle, the light that described light source sends passes described first gas, and, arrive described photodetector through passing described second gas after described first catoptron and described second mirror reflects.
2. gas measurement device according to claim 1 is characterized in that, it is 90 degree that described first catoptron and described second catoptron form angle.
3. gas measurement device according to claim 2 is characterized in that, described first gas and second gas be arranged in parallel.
4. gas measurement device according to claim 1 and 2 is characterized in that, it is acute angle that described light and described first catoptron form angle.
5. gas measurement device according to claim 4 is characterized in that, the angle that described light and described first catoptron form is 45 degree.
6. gas measurement device according to claim 1 is characterized in that, also comprises the air intake opening of being located at described first gas and the gas outlet of being located at described second gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020559901 CN201811920U (en) | 2010-10-12 | 2010-10-12 | Gas measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020559901 CN201811920U (en) | 2010-10-12 | 2010-10-12 | Gas measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201811920U true CN201811920U (en) | 2011-04-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201020559901 Expired - Lifetime CN201811920U (en) | 2010-10-12 | 2010-10-12 | Gas measuring device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104165857A (en) * | 2014-07-01 | 2014-11-26 | 上海申渭电子科技有限公司 | High-sensitivity multi-parameter explosion-proof type infrared gas sensor |
| CN104964944A (en) * | 2015-06-23 | 2015-10-07 | 广州华友明康光电科技有限公司 | Two-way infrared spectrum analysis system and testing method thereof |
| CN106841106A (en) * | 2016-12-12 | 2017-06-13 | 中国科学院光电研究院 | A kind of bi-component trace gas concentration measurement apparatus based on Research on Cavity Ring Down Spectroscopy |
| CN107044965A (en) * | 2017-02-07 | 2017-08-15 | 中国科学院寒区旱区环境与工程研究所 | A kind of gas measurement device |
| CN107421897A (en) * | 2017-06-13 | 2017-12-01 | 上海森谱科技有限公司 | A kind of single light source double suction receives pond gas phase molecular absorption spectrometer |
-
2010
- 2010-10-12 CN CN 201020559901 patent/CN201811920U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104165857A (en) * | 2014-07-01 | 2014-11-26 | 上海申渭电子科技有限公司 | High-sensitivity multi-parameter explosion-proof type infrared gas sensor |
| CN104165857B (en) * | 2014-07-01 | 2017-02-15 | 上海申渭电子科技有限公司 | High-sensitivity multi-parameter explosion-proof type infrared gas sensor |
| CN104964944A (en) * | 2015-06-23 | 2015-10-07 | 广州华友明康光电科技有限公司 | Two-way infrared spectrum analysis system and testing method thereof |
| CN104964944B (en) * | 2015-06-23 | 2017-10-31 | 广州华友明康光电科技有限公司 | A kind of two-way infrared spectrum analysis system and its detection method |
| CN106841106A (en) * | 2016-12-12 | 2017-06-13 | 中国科学院光电研究院 | A kind of bi-component trace gas concentration measurement apparatus based on Research on Cavity Ring Down Spectroscopy |
| CN106841106B (en) * | 2016-12-12 | 2019-08-02 | 中国科学院光电研究院 | A kind of bi-component trace gas concentration measuring device based on Research on Cavity Ring Down Spectroscopy |
| CN107044965A (en) * | 2017-02-07 | 2017-08-15 | 中国科学院寒区旱区环境与工程研究所 | A kind of gas measurement device |
| CN107421897A (en) * | 2017-06-13 | 2017-12-01 | 上海森谱科技有限公司 | A kind of single light source double suction receives pond gas phase molecular absorption spectrometer |
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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 | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110427 |