CN108181265B - Double-channel low-concentration water-gas high-precision measuring device and method - Google Patents
Double-channel low-concentration water-gas high-precision measuring device and method Download PDFInfo
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- CN108181265B CN108181265B CN201711335753.8A CN201711335753A CN108181265B CN 108181265 B CN108181265 B CN 108181265B CN 201711335753 A CN201711335753 A CN 201711335753A CN 108181265 B CN108181265 B CN 108181265B
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- 238000000034 method Methods 0.000 title claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 238000005259 measurement Methods 0.000 claims description 62
- 238000004364 calculation method Methods 0.000 claims description 4
- 238000000691 measurement method Methods 0.000 claims description 3
- 238000000041 tunable diode laser absorption spectroscopy Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/02—Mechanical
Abstract
The invention discloses a double-channel low-concentration water-gas high-precision measuring device and a double-channel low-concentration water-gas high-precision measuring method, which comprise a laser generator, a water-gas concentration measuring instrument and a first measuring air chamber, wherein laser enters the first measuring air chamber through a first collimator arranged at one end of the measuring air chamber, a first detector arranged at the other end of the measuring air chamber receives the laser passing through the measuring air chamber and sends a received laser signal containing information of the measured air chamber to the water-gas concentration measuring instrument, the device also comprises a light splitter, a second collimator and a second detector, the second collimator and the second detector are attached to each other without gaps, the light splitter divides the laser into two parts according to 50% of splitting ratio and connects the first collimator and the second collimator, and the first measuring laser signal received by the first detector and the second measuring laser signal received by the second detector are simultaneously sent to the water-gas concentration measuring instrument. According to the invention, through setting two channels, the water vapor in the actual environment and the water vapor in the detector are respectively collected at the same time, and the real water vapor concentration is obtained through subtraction.
Description
Technical Field
The invention relates to a double-channel low-concentration water gas high-precision measuring device and method, in particular to a double-channel low-concentration water gas high-precision measuring device and method based on a spectrum absorption technology.
Background
Because TDLAS detection needs to detect light and passes through a detection path communicated with the atmosphere, the TDLAS detection is generally designed into a cylindrical barrel-shaped gas absorption gas chamber. The air chamber is made of metal materials, and a collimating lens and an optical fiber flange are arranged in the center of one side of the air chamber and used as input ends of laser; the center of the other side is provided with a photoelectric detector, and the photoelectric detector is led out by a cable and connected with a rear-end conditioning circuit; the middle section of the air chamber is hollow, so that the light path can be communicated with the external atmosphere. The gas exchange of the TDLAS sensor is formed by an optical fiber end face, a collimating lens, a gas chamber and a photoelectric detector.
There are problems in that: because TDLAS technique adopts the air chamber that collimating mirror and detector constitute to test the aqueous vapor as sensing element, has the aqueous vapor in the detector, and laser has one section aqueous vapor through the detector and absorbs the inaccuracy that causes low concentration aqueous vapor measurement, and the moisture of storing in the detector is difficult to be got rid of, receives environmental impact moreover.
Disclosure of Invention
The invention aims to provide a double-channel low-concentration water vapor high-precision measuring device and method.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a double-channel low-concentration water vapor high-precision measuring device comprises a measuring laser generator, a water vapor concentration measuring instrument and a first measuring air chamber, wherein a first collimator and a first detector are respectively arranged at two ends of the first measuring chamber, measuring laser emitted by the measuring laser generator enters the first measuring air chamber through the first collimator arranged at one end of the first measuring air chamber, the first detector arranged at the other end of the first measuring chamber receives measuring laser passing through the first measuring air chamber and sends received laser signals containing information of the measured gas to the water vapor concentration measuring instrument, the device further comprises a light splitter, a second collimator and a second detector, the second collimator and the second detector are attached to each other without gaps, measuring laser emitted by the measuring laser generator is firstly sent to the light splitter, and the light splitter divides the measuring laser into the first measuring laser and the second measuring laser according to the splitting ratio of 50 percent, the first measuring laser is connected with the first collimator, the second measuring laser is connected with the second collimator, the second detector receives a second measuring laser signal of the second collimator, and the first measuring laser signal received by the first detector and the second measuring laser signal received by the second detector are simultaneously sent to the water-gas concentration measuring instrument.
The scheme is further as follows: the first collimator and the second collimator are respectively anhydrous collimators, the technical parameters of the anhydrous collimators and the anhydrous collimators are consistent, and the technical parameters of the first detector and the second detector are consistent.
The scheme is further as follows: the first collimator and the first detector are spaced apart by a distance of 20 cm in the first measurement gas cell.
The scheme is further as follows: the device also comprises a second measurement gas chamber, and the second collimator and the second detector are arranged in the second measurement gas chamber.
A two-channel low-concentration water vapor high-precision measuring method comprises a measuring laser generator, a water vapor concentration measuring instrument and a first measuring air chamber, wherein the water vapor concentration measuring instrument obtains a water vapor concentration value by calculation from an obtained laser measuring signal; wherein the method comprises the following steps: a second measurement air chamber is arranged, a second collimator and a second detector are arranged in the second measurement air chamber, the second collimator and the second detector are arranged in the second measurement air chamber in a manner of attaching and gapless, the first collimator and the second collimator are respectively an anhydrous collimator, technical parameters of the anhydrous collimator and the anhydrous collimator are consistent, and technical parameters of the first detector and the second detector are consistent; the method comprises the steps of firstly sending measurement laser emitted by a measurement laser generator to a light splitter, dividing the measurement laser into a first measurement laser and a second measurement laser according to 50% of the splitting ratio, sending the first measurement laser to a first collimator, sending the received first measurement laser to a first detector through a first measurement air chamber by the first collimator, sending the second measurement laser to a second collimator, sending the received second measurement laser to a second detector in a gapless manner by the second collimator, receiving laser measurement signals of the first detector and the second detector by a water concentration measuring instrument at the same time, obtaining a first water concentration value from a laser measurement signal of the first detector, obtaining a second water concentration value from a laser measurement signal of the second detector, and subtracting the second water concentration value from the first water concentration value to obtain a final water concentration value of the measured air in the measurement air chamber.
The scheme is further as follows: the technical parameter coincidence is that the technical parameter error between the technical parameters of the first and second detectors and the first and second collimators is less than 5%.
The scheme is further as follows: the first collimator and the first detector are spaced apart by a distance of 20 cm in the first measurement gas cell.
Compared with the prior art, the invention has the beneficial effects that: through setting up the double-chamber passageway, gather the aqueous vapor of actual environment and the aqueous vapor in the detector respectively simultaneously, obtain real environment aqueous vapor concentration through subtracting, improved measurement accuracy.
The invention is described in detail below with reference to the figures and examples.
Drawings
FIG. 1 is a schematic view of the structure of the apparatus of the present invention.
Detailed Description
Example 1:
a two-channel low-concentration water vapor high-precision measuring device is shown in figure 1 and comprises a measuring laser generator 1, a water vapor concentration measuring instrument 2 and a first measuring air chamber 3, wherein the first measuring air chamber is used for containing measured gas; wherein the laser generator is a DFB laser generator and its understanding device, the line width (what line width) is 5M, the DFB laser generator and its driving device are contained in the TDLAS host, the laser generated by the laser driver, the two ends of the first measuring chamber are respectively provided with a first laser collimator 4 and a first laser detector 5 (laser receiving sensor), the measuring laser emitted by the measuring laser generator enters the first measuring chamber through the first laser collimator arranged at one end of the first measuring chamber, the measuring laser passing through the first measuring chamber is received by the first detector arranged at the other end of the first measuring chamber, the first detector sends the received laser signal containing the measured gas information to the water gas concentration measuring instrument, the water gas concentration measuring instrument contains a signal processing circuit in the prior art, the laser signal is sent to the signal processing circuit after being converted into an electric signal, the device further comprises a light splitter 6, a second collimator 7 and a second detector 8, the second collimator and the second detector are arranged in a gapless mode in a pasting mode, measuring laser emitted by the measuring laser generator firstly reaches the light splitter, the light splitter divides the measuring laser into first measuring laser and second measuring laser according to 50% of the splitting ratio, the first measuring laser is connected with the first collimator, the second measuring laser is connected with the second collimator, the second detector receives second measuring laser signals of the second collimator, and the first measuring laser signals received by the first detector and the second measuring laser signals received by the second detector are simultaneously sent to the water-gas concentration measuring instrument.
Of course, the water gas concentration measuring instrument may be a part of the TDLAS host, and may be a signal collecting and processing circuit, where the signal collecting and processing circuit collects and receives signals of the first detector and the second detector, and then transmits the signals to the computer for calculation and processing to obtain concentration data.
Wherein: in order to ensure the accuracy of the test, the first collimator and the second collimator are respectively a waterless collimator, the technical parameters of the waterless collimator and the waterless collimator are consistent, and the technical parameters of the first detector and the second detector are consistent. The agreement here is a pairing, which should have a pairing error of less than 5%.
Wherein: the first collimator and the first detector are spaced apart by a distance of 20 cm in the first measurement gas cell.
In addition: the device also comprises a second measurement gas chamber, and the second collimator and the second detector are arranged in the second measurement gas chamber, but the second measurement gas chamber can also be directly arranged on a bracket without being arranged.
Example 2:
a dual-channel low-concentration water vapor high-precision measurement method is a method for improving measurement precision based on the device in embodiment 1, and the content in embodiment 1 is regarded as the content in this embodiment, therefore, the method comprises a measurement laser generator, a water vapor concentration measuring instrument and a first measurement air chamber, the measurement analysis method in the water vapor concentration measuring instrument is widely applied in the known technology, the water vapor concentration measuring instrument obtains the water vapor concentration value of the measured gas through calculation from the obtained laser measurement signal, a first collimator and a first detector are respectively arranged at two ends of the first measurement chamber, and the measured gas is put into or filled into the first measurement air chamber; the method further comprises the following steps: a second measurement air chamber is arranged, a second collimator and a second detector are arranged in the second measurement air chamber, the second collimator and the second detector are arranged in the second measurement air chamber in a manner of attaching and gapless, the second measurement air chamber can also place the measured gas into the same simulated environment, the first collimator and the second collimator are respectively a waterless collimator, the technical parameters of the first collimator and the second collimator are consistent, and the technical parameters of the first detector and the second detector are consistent; firstly, sending the measuring laser emitted by the measuring laser generator to a light splitter, dividing the measuring laser into a first measuring laser and a second measuring laser according to 50% of the splitting ratio, sending the first measuring laser to a first collimator, sending the received first measuring laser to a first detector through a first measuring gas chamber by the first collimator, sending the second measuring laser to a second collimator, sending the received second measuring laser to a second detector without clearance, simultaneously or respectively receiving laser measuring signals of the first detector and the second detector by a water-gas concentration measuring instrument, obtaining a first water-gas concentration value from the laser measuring signal of the first detector, obtaining a second water-gas concentration value from the laser measuring signal of the second detector, subtracting the second water-gas concentration value from the first water-gas concentration value to obtain a final water-gas concentration value of the measured gas in the measuring gas chamber, namely the water-gas concentration of the actual real environment.
Wherein: the technical parameter consistency is that the technical parameter errors between the first detector and the second detector and between the technical parameters of the first collimator and the second collimator are less than 5%; and: the first collimator and the first detector are spaced apart by a distance of 20 cm in the first measurement gas cell.
Claims (7)
1. A double-channel low-concentration water vapor high-precision measuring device comprises a measuring laser generator, a water vapor concentration measuring instrument and a first measuring air chamber, wherein a first collimator and a first detector are respectively arranged at two ends of the first measuring chamber, measuring laser emitted by the measuring laser generator enters the first measuring air chamber through the first collimator arranged at one end of the first measuring air chamber, a first detector arranged at the other end of the first measuring chamber receives measuring laser passing through the first measuring air chamber and sends received laser signals containing information of the measured air chamber to the water vapor concentration measuring instrument, the double-channel low-concentration water vapor high-precision measuring device is characterized by further comprising a light splitter, a second collimator and a second detector, the second collimator and the second detector are attached to each other without gaps, measuring laser emitted by the measuring laser generator is firstly sent to the light splitter, the light splitter divides the measuring laser into the first measuring laser and the second measuring laser according to a splitting ratio of 50 percent, the first measuring laser is connected with the first collimator, the second measuring laser is connected with the second collimator, the second detector receives a second measuring laser signal of the second collimator, and the first measuring laser signal received by the first detector and the second measuring laser signal received by the second detector are simultaneously sent to the water-gas concentration measuring instrument.
2. The high-precision measuring device according to claim 1, wherein the first collimator and the second collimator are respectively anhydrous collimators, technical parameters of the first collimator and the second collimator are consistent, and technical parameters of the first detector and the second detector are consistent.
3. A high accuracy measurement apparatus according to claim 1, wherein the first collimator and the first detector are spaced apart by a distance of 20 cm in the first measurement gas chamber.
4. A high accuracy measurement device according to claim 1, further comprising a second measurement gas cell, said second collimator and second detector being arranged in the second measurement gas cell.
5. A two-channel low-concentration water vapor high-precision measuring method comprises a measuring laser generator, a water vapor concentration measuring instrument and a first measuring air chamber, wherein the water vapor concentration measuring instrument obtains a water vapor concentration value by calculation from an obtained laser measuring signal; the method is characterized by comprising the following steps: a second measurement air chamber is arranged, a second collimator and a second detector are arranged in the second measurement air chamber, the second collimator and the second detector are arranged in the second measurement air chamber in a manner of attaching and gapless, the first collimator and the second collimator are respectively an anhydrous collimator, technical parameters of the anhydrous collimator and the anhydrous collimator are consistent, and technical parameters of the first detector and the second detector are consistent; the method comprises the steps of firstly sending measurement laser emitted by a measurement laser generator to a light splitter, dividing the measurement laser into a first measurement laser and a second measurement laser according to 50% of the splitting ratio, sending the first measurement laser to a first collimator, sending the received first measurement laser to a first detector through a first measurement air chamber by the first collimator, sending the second measurement laser to a second collimator, sending the received second measurement laser to a second detector in a gapless manner by the second collimator, receiving laser measurement signals of the first detector and the second detector by a water concentration measuring instrument at the same time, obtaining a first water concentration value from a laser measurement signal of the first detector, obtaining a second water concentration value from a laser measurement signal of the second detector, and subtracting the second water concentration value from the first water concentration value to obtain a final water concentration value of the measured air in the measurement air chamber.
6. The dual-channel low-concentration water-gas high-precision measurement method according to claim 5, wherein the technical parameter consistency is that the technical parameter error between the technical parameters of the first and second detectors and the technical parameter error between the technical parameters of the first and second collimators is less than 5%.
7. The dual-channel low-concentration water-gas high-precision measurement method according to claim 5, wherein the first collimator and the first detector are separated by a distance of 20 cm in the first measurement gas chamber.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1222974A (en) * | 1997-04-09 | 1999-07-14 | 日本酸素株式会社 | Analysis method for gases and apparatus therefor |
| CN104697951A (en) * | 2006-04-19 | 2015-06-10 | 光学传感公司 | Measuring water vapor in hydrocarbons |
| CN205374298U (en) * | 2016-01-15 | 2016-07-06 | 鞍山哈工激光科技有限公司 | Trace gas concentration detection apparatus based on TDLAS |
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| AU2003260041A1 (en) * | 2002-08-21 | 2004-03-11 | The Trustees Of Columbia University In The City Of New York | An arsenic meter |
| EP1693665B1 (en) * | 2005-02-22 | 2008-12-03 | Siemens Aktiengesellschaft | Method and apparatus for trace gas detection |
| CN102495021B (en) * | 2011-12-12 | 2013-07-24 | 山东大学 | System and method for detecting trace amount of steam based on two absorption peaks |
| CN102680428B (en) * | 2012-05-16 | 2014-04-02 | 清华大学 | Gas temperature and concentration online measuring method based on first harmonic signal |
| CN104237125A (en) * | 2013-06-07 | 2014-12-24 | 西克股份公司 | Two-Channeled Measurement Apparatus |
| CN103344614B (en) * | 2013-07-02 | 2015-09-23 | 中国科学院合肥物质科学研究院 | A kind of atmospheric transmissivity at high precision measurement mechanism and measuring method |
| CN105158187A (en) * | 2015-10-26 | 2015-12-16 | 中国人民解放军军事医学科学院卫生装备研究所 | On-line monitoring type gas chamber of absorbent-type optical fiber gas sensor |
| CN107084926B (en) * | 2017-05-04 | 2019-10-11 | 北京清环智慧水务科技有限公司 | Liquid clarity detection method, system and device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1222974A (en) * | 1997-04-09 | 1999-07-14 | 日本酸素株式会社 | Analysis method for gases and apparatus therefor |
| CN104697951A (en) * | 2006-04-19 | 2015-06-10 | 光学传感公司 | Measuring water vapor in hydrocarbons |
| CN205374298U (en) * | 2016-01-15 | 2016-07-06 | 鞍山哈工激光科技有限公司 | Trace gas concentration detection apparatus based on TDLAS |
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