CN108303376B - Multi-cavity series gas sample cell with built-in reflecting mirror - Google Patents
Multi-cavity series gas sample cell with built-in reflecting mirror Download PDFInfo
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- CN108303376B CN108303376B CN201711345421.8A CN201711345421A CN108303376B CN 108303376 B CN108303376 B CN 108303376B CN 201711345421 A CN201711345421 A CN 201711345421A CN 108303376 B CN108303376 B CN 108303376B
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- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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Abstract
The invention belongs to the technical field of atmospheric environment measurement, and particularly relates to a multi-cavity series gas sample cell with a built-in reflector. The sample cell comprises a sample cell main body and a quartz reflector; the sample cell main body comprises a first sample cell and at least one second sample cell which are connected in series, and the two sample cells are separated by a quartz window; the quartz reflecting mirror is arranged in the first sample cell, the reflecting mirror faces the middle quartz window, and the front end of the second sample cell is provided with the quartz window. Connecting the first sample cell and the second sample cell in series to use and introduce sample gas so as to achieve the aim of realizing a plurality of equivalent concentrations by using gas with single concentration; after the quartz reflector is arranged in the sample cell, light rays are reflected in the sample cell, and light path adjustment is simplified. The gas sample cell overcomes the defect that the existing sample cell can only calibrate one equivalent concentration for one concentration sample gas, improves the use efficiency and the work efficiency of the sample gas, reduces the error in the gas calibration process, and has convenient operation and easy manufacture.
Description
Technical Field
The invention belongs to the technical field of atmospheric environment measurement, and particularly relates to a multi-cavity series gas sample cell with a built-in reflector for calibrating an atmospheric environment monitoring instrument.
Background
To utilize spectral analysis technique to survey atmospheric environment monitoring instrument of pollutant, the during operation need be sent out measuring beam, after the transmission of certain distance, is reflected back to the instrument by the speculum of distance (this speculum is one part of instrument, and ordinary distancer is tens to several hundred meters), through the spectrum of analysis reflection back, can calculate the regional atmospheric pollutants concentration that the light beam passed through. After such instruments have been in operation for a period of time, the instrument needs to be calibrated using a standard sample gas of known concentration. When the instrument is calibrated, a sample cell with a certain length is inserted into a measuring light path, measuring light beams are emitted into the sample cell from one end of the sample cell, pass through standard sample gas of the sample cell and then are emitted from the other end of the sample cell, and then are reflected by a reflector, pass through the sample cell and the standard sample gas again and enter an instrument measuring system for concentration calculation and calibration.
Utilize the standard sample gas of single known concentration to mark the instrument time, the sample cell of certain length can only correspond an equivalent concentration, in order to improve instrument measurement accuracy, need use a plurality of equivalent concentrations to mark the instrument, in order to realize a plurality of equivalent concentrations, need change the sample cell of different length in the light path, or use same sample cell, change the standard sample gas of different concentrations, no matter adopt the unchangeable change sample cell length of gas concentration, or the unchangeable change gas concentration of sample cell, the work load and the fortune dimension cost when all can increase the calibration instrument.
In order to improve the calibration accuracy, when the instrument is calibrated, the reflecting mirror needs to be close to the front of the instrument as much as possible, the sample cell is placed between the instrument and the reflecting mirror to realize a so-called 'zero light path', so that the reflecting mirror at a far distance needs to be detached and placed in front of the instrument, or another reflecting mirror is used and placed in front of the instrument, so that the operation and maintenance workload of the instrument is increased, and meanwhile, the difficulty is brought to the light path adjustment of the instrument.
Disclosure of Invention
Aiming at the defects of the existing gas sample cell in the using process, the invention aims to provide the gas sample cell which is convenient to use, does not need to adjust a light path again and realizes the multi-point equivalent concentration calibration of a measuring instrument by using single standard concentration sample gas.
The invention provides a multi-chamber series gas sample cell with a built-in reflector, a sample collection cell and a reflector, which are integrated, and comprises: a sample cell body, a quartz mirror; the sample cell main body comprises a first sample cell and at least one second sample cell which are connected in series, and the two sample cells are separated by a quartz window; the following description will be given by taking a sample cell in which two chambers are connected in series as an example.
The first sample cell is internally provided with a quartz reflector, the reflector faces to the quartz window, and the diameter of the reflector is equal to that of the sample cell. One side of the first sample pool is provided with an air inlet hole, and the other corresponding side of the first sample pool is provided with an air outlet hole.
The front end of the second sample cell is provided with a quartz window. One side of the second sample cell is provided with an air outlet hole, and the other corresponding side is provided with an air inlet hole.
The sample cell main body (namely the first sample cell and the second sample cell) is fixed by a front window flange, a middle connecting flange and a rear flange.
In the invention, the air outlet hole of the first sample cell and the second air inlet hole of the second sample cell are connected through the hose, so that the first sample cell and the second sample cell are connected in series for use.
In the invention, the inner diameter and the outer diameter of the first sample cell and the second sample cell are the same. The distance between the quartz reflector in the first sample cell and the middle quartz window is 2-5 cm.
In the invention, the outer diameter of the middle quartz window between the first sample cell and the second sample cell is the same as that of the first sample cell.
In the invention, the outer diameter of the quartz window at the front end of the second sample cell is the same as that of the second sample cell.
In the invention, when a plurality of second sample cells are arranged in the sample cell main body, the second sample cells are connected in series, and the structure composition is the same (if the inner diameter and the outer diameter are the same), and the lengths can be different.
Compared with the existing gas sample cell, the invention can realize a plurality of equivalent concentrations by using different combinations of all the sample cells in the series sample cell and only introducing gas with single concentration, and because the quartz reflector is arranged in the gas sample cell, a light source or the sample cell does not need to be moved during the calibration of the concentration of a plurality of equivalent gases, so that the light path adjustment is not needed again, and the gas sample cell has the characteristics of simplifying operation and reducing analysis errors.
Drawings
FIG. 1 is a schematic diagram of the system structure of the apparatus of the present invention.
Reference numbers in the figures: 01 is a first sample cell, 02 is a second sample cell, 03 is a quartz reflector, 04 is a first air inlet, 05 is a first air outlet, 06 is a second air inlet, 07 is a second air outlet, 08 is a middle quartz window, 09 is a front quartz window, 10 is a rear flange, 11 is a middle connecting flange, 12 is a front window flange, and 13 is a bottom plate.
Detailed Description
Referring to fig. 1, the present multi-chamber series gas sample cell device using a novel reflector, comprises: the device comprises a first sample cell 01, a second sample cell 02, a quartz reflector 03, a first air inlet hole 04, a first air outlet hole 05, a second air inlet hole 06, a second air outlet hole 07, a middle quartz window 08, a front quartz window 09, a rear flange 10, a middle connecting flange 11 and a front window flange 12.
The length of the second sample cell 02 is 9 cm.
And the air outlet 05 of the first sample cell 01 is connected with the air inlet 06 of the second sample cell 02 through a hose, so that the first sample cell and the second sample cell are connected in series.
The inner diameter and the outer diameter of the first sample pool 01 and the second sample pool 02 are the same. The quartz mirror 03 in the first sample cell is 3cm from the intermediate quartz window 08.
The outer diameter of the middle quartz window 08 between the first sample cell 01 and the second sample cell 02 is the same as that of the first sample cell.
The outer diameter of the quartz window 09 at the front end of the second sample cell is the same as that of the second sample cell 02.
When the gas sample cell is used, a measuring beam can be injected into the sample cell through the front window flange, passes through the second sample cell, the middle quartz window and the first sample cell, is reflected by the quartz reflector, and is reversely injected back along an injection path to enter an instrument measuring system.
After the light path is adjusted and the sample cell is stabilized, sample gas with standard concentration is introduced into the first sample cell from the first gas inlet, and high-purity air, nitrogen or other gas which does not influence the calibration of the gas to be measured is introduced into the second sample cell from the second gas inlet, so that the instrument can be calibrated by the first equivalent concentration; when the sample gas with the standard concentration is introduced into the second sample cell from the second gas inlet, high-purity air, nitrogen or other gas which does not influence the calibration of the gas to be detected is introduced into the first sample cell from the first gas inlet, so that the calibration of the instrument with the second equivalent concentration can be realized; the first air outlet hole and the second air inlet hole are connected through the hose, the sample gas with the standard concentration is introduced into the first sample pool, the sample gas with the standard concentration enters the first sample pool, enters the second sample pool after passing through the first air outlet hole and the second air inlet hole, and is discharged out of the sample pool through the second air outlet hole, so that the series connection work of the first sample pool and the second sample pool is realized, and the calibration of a third equivalent concentration on the instrument can be realized. After each calibration, the sample cell into which the sample gas is introduced should be purged by continuously introducing high-purity air for several minutes.
The above description is only an embodiment of the present invention, and the present embodiment is described with two chambers connected in series. But the technical characteristic of the invention can be that a plurality of sample cell chambers with the same structure and different lengths with the second sample cell are connected in series at the front end of the front quartz window so as to achieve the purpose of increasing the equivalent concentration quantity. Therefore, any changes or modifications that one skilled in the art can make while using the present invention are covered by the scope of the claims of the present invention.
Claims (6)
1. A mirror-embedded multi-chamber in-line gas sample cell, comprising: a sample cell body, a quartz mirror; the sample cell main body comprises a first sample cell and at least one second sample cell which are connected in series, and the two sample cells are separated by an intermediate quartz window;
the quartz reflector is arranged in the first sample cell, the reflector faces the quartz window, and the diameter of the reflector is equal to that in the sample cell; an air inlet hole is formed in one side of the first sample tank, and an air outlet hole is formed in the other corresponding side of the first sample tank;
the front end of the second sample cell is provided with a quartz window; one side of the second sample cell is provided with an air outlet, and the other corresponding side is provided with an air inlet;
the sample cell main body is fixed by a front window flange, a middle connecting flange and a rear flange;
the measuring beam can enter the sample cell through the front window flange, passes through the second sample cell, the middle quartz window and the first sample cell, is reflected by the quartz reflector, and enters the instrument measuring system after being reflected along the entering path in the reverse direction.
2. A mirror-embedded multi-chamber in-line gas sample cell according to claim 1, wherein the gas outlet of the first sample cell and the second gas inlet of the second sample cell are connected by a hose to enable in-line use of the first sample cell and the second sample cell.
3. A mirror-embedded multi-chamber in-line gas sample cell according to claim 1, wherein the first and second sample cells have the same inside and outside diameters, and the quartz mirror in the first sample cell is spaced from the middle quartz window by 2-4 cm.
4. A mirror built-in multi-chamber in-line gas sample cell according to claim 1, wherein the outer diameter of the intermediate quartz window between the first sample cell and the second sample cell is the same as the outer diameter of the first sample cell.
5. A mirror built-in multi-chamber in-line gas sample cell according to claim 1, wherein the quartz window at the front end of the second sample cell has the same outer diameter as the second sample cell.
6. A mirror-embedded multi-chamber in-line gas sample cell according to any of claims 1 to 5, wherein the plurality of second sample cells in the cell body are connected in series and have the same structure.
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| CN201711345421.8A CN108303376B (en) | 2017-12-15 | 2017-12-15 | Multi-cavity series gas sample cell with built-in reflecting mirror |
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| CN201711345421.8A CN108303376B (en) | 2017-12-15 | 2017-12-15 | Multi-cavity series gas sample cell with built-in reflecting mirror |
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| CN108303376B true CN108303376B (en) | 2020-12-22 |
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| CN111239079B (en) * | 2020-03-09 | 2022-11-11 | 上海交通大学 | Time-varying turbid field simulation device with fixed optical depth |
| CN111537454B (en) * | 2020-04-27 | 2023-08-04 | 深圳网联光仪科技有限公司 | Comprehensive detection method based on multiple reflection and attenuated total reflection |
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| DE3622957A1 (en) * | 1986-07-09 | 1988-02-11 | Kernforschungsz Karlsruhe | METHOD AND DEVICE FOR ANALYSIS BY MEANS OF MICROWAVES |
| DE19528919A1 (en) * | 1995-08-07 | 1997-02-20 | Microparts Gmbh | Microstructured infrared absorption photometer |
| CN2445323Y (en) * | 2000-08-11 | 2001-08-29 | 中国科学院安徽光学精密机械研究所 | Gas concentration calibrater |
| CN101592599A (en) * | 2008-05-28 | 2009-12-02 | 北京市加华博来科技有限公司 | Absorbing cavity of infrared gas sensor with wide spectrum light source |
| CN101929952A (en) * | 2009-06-18 | 2010-12-29 | 安徽蓝盾光电子股份有限公司 | Air quality continuous on line monitor gas calibrating method and device |
| US8842282B2 (en) * | 2012-12-12 | 2014-09-23 | Spectrasensors, Inc. | Optical reflectors for spectrometer gas cells |
| CN103196845A (en) * | 2013-02-25 | 2013-07-10 | 陈亚锋 | Multi-component concentration analyzing device and measuring chamber thereof |
| CN104101568A (en) * | 2013-04-03 | 2014-10-15 | 徐元哲 | Device for monitoring SF6 content of air based on photoacoustic spectrum technology |
| CN203519489U (en) * | 2013-10-29 | 2014-04-02 | 杭州同孚环保科技有限公司 | On-line fast detector for moisture content of biomass particle fuel |
| DE102013224847B3 (en) * | 2013-12-04 | 2015-03-19 | Implen GmbH | Analyzer (photometer) with serial light guide |
| CN104155241B (en) * | 2014-07-02 | 2016-08-24 | 合肥工业大学 | A kind of light path adjustable long-range optical absorption pond |
| CN104155261A (en) * | 2014-08-27 | 2014-11-19 | 无锡格林通安全装备有限公司 | Gas calibration device of infrared gas detector |
| CN106053428B (en) * | 2016-05-25 | 2018-11-06 | 武汉理工大学 | A kind of petrochemical industry based on the enhancing of F-P optical signallings carries the sensing device of hydrogen pipeline gas content on-line measurement |
| CN106124404A (en) * | 2016-07-21 | 2016-11-16 | 中国科学院合肥物质科学研究院 | A kind of multiple reflections absorbs sample cell |
| CN206479449U (en) * | 2017-01-23 | 2017-09-08 | 章欣 | Optical gas absorbance pond and optical gas sensor |
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