CN1727875A - Method for detecting density of hydrogen - Google Patents
Method for detecting density of hydrogen Download PDFInfo
- Publication number
- CN1727875A CN1727875A CN 200510046907 CN200510046907A CN1727875A CN 1727875 A CN1727875 A CN 1727875A CN 200510046907 CN200510046907 CN 200510046907 CN 200510046907 A CN200510046907 A CN 200510046907A CN 1727875 A CN1727875 A CN 1727875A
- Authority
- CN
- China
- Prior art keywords
- resonant
- hydrogen
- frequency
- gas
- photoacoustic cell
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
-
- 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
-
- 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
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
- G01N2021/1704—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids in gases
Landscapes
- Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Optics & Photonics (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
A method for detecting concentration of nitrogen includes sending laser beam launched by tunable laser into resonant optoacoustic cell loaded with gas mixture through modulator with adjustable frequency , detecting generated optoacoustic signal by microsounder , obtaining curve of optoacoustic signal amplitude variation in following operation frequency variation in said cell by varying modulation frequency of optical intensity continuously for confirming resonant frequency , confirming nitrogen concentration according to resonant frequency variation rule caused by influence of nitrogen in gas mixture to average molecular weight .
Description
Technical field
The invention belongs to minimum gas detection technique field.The photo-acoustic detection method that relates to a kind of density of hydrogen specially refers to the method for determining density of hydrogen in the mixed gas by the variable quantity of measuring resonant photoacoustic cell resonant frequency.
Background technology
Hydrogen is not only a kind of important raw material of industry, all is a kind of important sign gas at field hydrogen such as the monitoring of spacecraft fuel tank, hydrogen cooled generator leak detection, large-scale power transformer on-line fault diagnosis and inflammable gas detections.
At present, comparatively widely used hydrogen gas sensor can be divided into three classes of measuring based on galvanochemistry, air-sensitive pottery and thermal conductivity according to its sensing mechanism.The electrochemical hydrogen gas sensor utilizes the electrolytic cell principle that the concentration of gas is converted to electric signal, and its outstanding deficiency is that serviceable life is shorter.Air-sensitive pottery hydrogen gas sensor then mainly is the gas-sensitive property that utilizes the metal oxide N-type semiconductor N, and its working temperature is higher, dynamic range is less.And also all there is obviously shortcoming in above-mentioned two class hydrogen gas sensors on gas-selectively and job stability.By contrast, the characteristic that heat-conducted hydrogen gas sensor utilizes hydrogen to have higher heat-conductivity is determined the concentration of hydrogen by the temperature variation of thermal sensing element, its serviceable life is long, dynamic range is also bigger, but it must be accepted or rejected between sensitivity and job stability to some extent.
The optoacoustic spectroscopy detection technique of gas also is a kind of effective gas detection means.In recent years along with the development and the application of LASER Light Source, the optoacoustic spectroscopy detection technique demonstrate time response fast, detection sensitivity is high, dynamic range is big, good selective, but its detected object only limits to infrared band is had the gas of light absorption, does not possess detectability to there is not the hydrogen of light absorption at this wave band.
Summary of the invention
The objective of the invention is, provide a kind of device structure simple, realize being easy to the hydrogen detection method, realizing utilizing optoacoustic spectroscopy infrared band not have the detection of the hydrogen that absorbs, detect the means that a kind of real-time, high sensitivity, high stability, great dynamic range are provided for density of hydrogen.
Technical scheme of the present invention is, determines to comprise in the resonant photoacoustic cell concentration of hydrogen in the mixed gas of infrared absorption gas by the variable quantity of measuring resonant photoacoustic cell resonant frequency.
It is light source that the present invention adopts the Tunable Infrared Laser device, behind the light intensity modulator of laser output through a frequency adjustable, incide in the resonant photoacoustic cell that contains hydrogen and other infrared absorption gas, absorb and produce photoacoustic signal behind the gas absorption laser energy and detected by microphone.By the modulating frequency of continuous sweep light intensity modulator (for example chopper), and measure corresponding photoacoustic signal simultaneously, obtain the curve that photoacoustic signal changes with resonant photoacoustic cell frequency of operation.Can determine resonant photoacoustic cell resonant frequency under the corresponding density of hydrogen according to the peak value of photoacoustic signal in this curve.
The mean molecular weight of mixed gas depends on the concentration of hydrogen delicately among the present invention, and the resonant frequency of resonant photoacoustic cell depends on the mean molecular weight of mixed gas, is the approximately linear corresponding relation so can get between resonant photoacoustic cell resonant frequency and the density of hydrogen.After utilizing concentration known hydrogen that measuring system is demarcated, promptly can determine the concentration of hydrogen in the mixed gas according to the resonant frequency of resonant photoacoustic cell.
Effect of the present invention and benefit be, adopted resonant photoacoustic cell, can realize that the continuous flow of gas detects; Determine the concentration of hydrogen according to the variation of resonant photoacoustic cell resonant frequency, improved the sensitivity and the stability that detect greatly; Tested gas and electric signal are isolated fully, can realize the measurement of higher concentration.In addition, hydrogen detects the structure that does not need to change common resonant photo-acoustic spectrometer, as long as moving the modulating frequency scanning sequence within the specific limits promptly can realize, thereby has expanded the sensing range of optoacoustic spectroscopy when not influencing the original system detectability; And the hydrogen testing result is used to revise other infrared absorption gas optoacoustic amplitude measurement result, can improve the accuracy of detection of other gas.
Description of drawings
Accompanying drawing is the device synoptic diagram of the photo-acoustic detection method of density of hydrogen.
Among the figure: 1 Tunable Infrared Laser device; 2 laser beam; 3 frequency adjustable light intensity modulators; 4 resonant photoacoustic cells; 5 mixed gass; 6 microphones; 7 lock-in amplifiers; 8 computing machines.
Embodiment
Describe embodiments of the invention in detail below in conjunction with technical scheme and accompanying drawing.
The resonant frequency measuring of the mixed gas of step 1, non-hydrogen
At first charge into the mixed gas 5 that contains infrared absorption gas to resonant photoacoustic cell 4.Adjust the output wavelength of Tunable Infrared Laser device 1 according to the spectral absorption characteristics of infrared absorption gas in the mixed gas 5, the absorption line that the wavelength that makes laser beam 2 and infrared absorption gas are stronger overlaps, laser beam 2 incides in the resonant photoacoustic cell 4 that is filled with mixed gas 5 through the frequency adjustable light intensity modulator 3 by computing machine 8 controls.Infrared absorption gas absorption laser energy also produces the photoacoustic signal identical with the light intensity modulation frequency by the relaxation process of radiationless transition in the mixed gas 5, photoacoustic signal detects by microphone 6, is input in the computing machine 8 after lock-in amplifier 7 improves signal to noise ratio (S/N ratio) and amplifies.Computing machine 8 controlled frequency tunable optical intensity modulators 3 continuously change modulating frequency, measure photoacoustic signal under the corresponding modulating frequency simultaneously, can obtain the curve that photoacoustic signal changes with resonant photoacoustic cell 4 frequency of operation.Can determine the resonant frequency of resonant photoacoustic cell 4 this moment according to the peak value of photoacoustic signal in this curve.
The demarcation of step 2, variation of resonant frequency amount and density of hydrogen corresponding relation
Charge into the hydrogen that contains concentration known and the mixed gas 5 of infrared absorption gas to resonant photoacoustic cell 4.Through with step 1 in the similar process described measure the variable quantity of resonant photoacoustic cell resonant frequency: the laser beam 2 of the specific wavelength of selection incides in the resonant photoacoustic cell 4 that is filled with mixed gas 5 after through the frequency adjustable light intensity modulator 3 by computing machine 8 controls; Infrared absorption gas absorbs laser energy generation photoacoustic signal in the mixed gas 5, and photoacoustic signal detects and input computing machine 8 by microphone 6 and lock-in amplifier 7; Computing machine 8 control light intensity modulators 3 continuously change modulating frequency, measure photoacoustic signal under the corresponding modulating frequency simultaneously, obtain the curve that photoacoustic signal changes with resonant photoacoustic cell 4 frequency of operation; Determine the resonant frequency of the pairing resonant photoacoustic cell 4 of this density of hydrogen by this curve, thereby obtain the variable quantity of resonant frequency.By the measurement to a plurality of variable concentrations hydrogen gas mixtures-variation of resonant frequency amount, the linearity and dynamic range that can checking measurements be determined the corresponding relation of variation of resonant frequency amount and density of hydrogen.
In resonant photoacoustic cell 4, charge into the hydrogen that contains unknown concentration and the mixed gas 5 of infrared absorption gas.Measure the resonant frequency of resonant photoacoustic cell 4 with the method described in step 1 or the step 2, and utilize the corresponding relation of resulting variation of resonant frequency amount of step 2 and density of hydrogen, obtain corresponding density of hydrogen.
Claims (1)
1. the detection method of a density of hydrogen, it is characterized in that the laser beam (2) that Tunable Infrared Laser device (1) sends incides behind frequency adjustable light intensity modulator (3) in the resonant photoacoustic cell (4) that is loaded with mixed gas (5), the photoacoustic signal that infrared absorption gas is produced in the mixed gas (5) is detected by microphone (6); Obtain the curve that the photoacoustic signal amplitude changes with resonant photoacoustic cell (4) frequency of operation by continuously changing the light intensity modulation frequency, thereby determine the resonant frequency of resonant photoacoustic cell (4); The Changing Pattern of resonant photoacoustic cell (5) resonant frequency that the influence of mean molecular weight is caused according to hydrogen in the mixed gas (5) is determined the concentration of hydrogen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510046907 CN1727875A (en) | 2005-07-19 | 2005-07-19 | Method for detecting density of hydrogen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510046907 CN1727875A (en) | 2005-07-19 | 2005-07-19 | Method for detecting density of hydrogen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1727875A true CN1727875A (en) | 2006-02-01 |
Family
ID=35927263
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510046907 Pending CN1727875A (en) | 2005-07-19 | 2005-07-19 | Method for detecting density of hydrogen |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1727875A (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101718679B (en) * | 2009-11-26 | 2011-05-25 | 西南科技大学 | Device and method for online calibrating sensitivity of phonoscope |
| CN101251480B (en) * | 2007-02-21 | 2011-11-23 | 莱丹加工技术公司 | Gas sensor |
| CN101535795B (en) * | 2006-11-10 | 2012-02-22 | 皇家飞利浦电子股份有限公司 | Photo acoustic detector with improved signal processing |
| CN102539330A (en) * | 2012-01-06 | 2012-07-04 | 上海交通大学 | Off-resonance dual-cavity photoacoustic cell used in noninvasive blood glucose measurement and detection method |
| CN102680412A (en) * | 2012-05-11 | 2012-09-19 | 江苏舒茨测控设备有限公司 | Method for detecting concentration of trace steam by using photoacoustic spectrometry method |
| CN101739795B (en) * | 2008-11-21 | 2012-09-26 | 财团法人工业技术研究院 | Gas sensing module and wireless transmitting device and wireless sensing system using same |
| CN104931427A (en) * | 2015-07-02 | 2015-09-23 | 中国科学院合肥物质科学研究院 | Opto-acoustic gas detection device based on multiple reflections of optical path |
| CN107430069A (en) * | 2015-01-27 | 2017-12-01 | 阿肯马法国公司 | The mancarried device of the concentration of hydrogen sulfide of on-line measurement waste gas |
| CN109490215A (en) * | 2019-01-03 | 2019-03-19 | 江苏舒茨测控设备股份有限公司 | Utilize the system and method for photocaustic spectroscopy detection methyl bromide gas concentration |
| CN110596240A (en) * | 2019-08-21 | 2019-12-20 | 许昌学院 | Method and system for detecting hydrogen mixed gas by using decoupling acoustic relaxation spectrum |
| CN113804754A (en) * | 2021-09-18 | 2021-12-17 | 南京信息工程大学 | Soluble organic matter aqueous solution detection device and detection method |
| CN113933250A (en) * | 2021-09-22 | 2022-01-14 | 苏州大学 | Gas detection device, gas detection method and computer equipment |
| CN114235707A (en) * | 2021-12-17 | 2022-03-25 | 浙江树人学院（浙江树人大学） | Hydrogen detection device based on palladium absorption |
-
2005
- 2005-07-19 CN CN 200510046907 patent/CN1727875A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101535795B (en) * | 2006-11-10 | 2012-02-22 | 皇家飞利浦电子股份有限公司 | Photo acoustic detector with improved signal processing |
| CN101251480B (en) * | 2007-02-21 | 2011-11-23 | 莱丹加工技术公司 | Gas sensor |
| CN101739795B (en) * | 2008-11-21 | 2012-09-26 | 财团法人工业技术研究院 | Gas sensing module and wireless transmitting device and wireless sensing system using same |
| CN101718679B (en) * | 2009-11-26 | 2011-05-25 | 西南科技大学 | Device and method for online calibrating sensitivity of phonoscope |
| CN102539330A (en) * | 2012-01-06 | 2012-07-04 | 上海交通大学 | Off-resonance dual-cavity photoacoustic cell used in noninvasive blood glucose measurement and detection method |
| CN102680412B (en) * | 2012-05-11 | 2014-06-18 | 江苏舒茨测控设备有限公司 | Method for detecting concentration of trace steam by using photoacoustic spectrometry method |
| CN102680412A (en) * | 2012-05-11 | 2012-09-19 | 江苏舒茨测控设备有限公司 | Method for detecting concentration of trace steam by using photoacoustic spectrometry method |
| CN107430069A (en) * | 2015-01-27 | 2017-12-01 | 阿肯马法国公司 | The mancarried device of the concentration of hydrogen sulfide of on-line measurement waste gas |
| CN104931427A (en) * | 2015-07-02 | 2015-09-23 | 中国科学院合肥物质科学研究院 | Opto-acoustic gas detection device based on multiple reflections of optical path |
| CN109490215A (en) * | 2019-01-03 | 2019-03-19 | 江苏舒茨测控设备股份有限公司 | Utilize the system and method for photocaustic spectroscopy detection methyl bromide gas concentration |
| CN110596240A (en) * | 2019-08-21 | 2019-12-20 | 许昌学院 | Method and system for detecting hydrogen mixed gas by using decoupling acoustic relaxation spectrum |
| CN113804754A (en) * | 2021-09-18 | 2021-12-17 | 南京信息工程大学 | Soluble organic matter aqueous solution detection device and detection method |
| CN113933250A (en) * | 2021-09-22 | 2022-01-14 | 苏州大学 | Gas detection device, gas detection method and computer equipment |
| CN114235707A (en) * | 2021-12-17 | 2022-03-25 | 浙江树人学院（浙江树人大学） | Hydrogen detection device based on palladium absorption |
| CN114235707B (en) * | 2021-12-17 | 2024-05-03 | 浙江树人学院（浙江树人大学） | Hydrogen detection device based on palladium absorption |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1727875A (en) | Method for detecting density of hydrogen | |
| CN107064012B (en) | Quartz enhanced photoacoustic spectroscopy gas-detecting device and method based on beat effect | |
| CN207946353U (en) | A kind of gas concentration detection apparatus | |
| CN2874476Y (en) | Terahertz time domain spectral instrument based on optical rectification | |
| CN103543125B (en) | All-optical gas detection method and device based on Michelson interference principle | |
| CN109991189B (en) | Fixed point wavelength modulation gas concentration measuring device based on wave number drift correction and measuring method thereof | |
| CN105388120B (en) | Calibration Wavelength modulation spectroscopy gas detection method is exempted from based on WMRF models | |
| CN104237135A (en) | System and method for detecting CO gas based on quartz tuning fork enhanced photoacoustic spectrometry technology | |
| CN101435773A (en) | Gas monitoring method and apparatus based on quasi continuous diode laser modulated spectrum | |
| CN203658243U (en) | C2H2 and CH4 detection device based on photoacoustic spectrometry | |
| CN108801927B (en) | Device and method for detecting concentration of acetylene gas by photoinduced ultrasonic method | |
| CN105319183A (en) | Detector and detection method for real-time on-line detection of emission smoke intensity of diesel engine | |
| CN104062265A (en) | Detection device and detection method for multi-component gas in transformer oil based on spectrum analysis | |
| CN109813639B (en) | Infrared light modulation technology-based synchronous measurement device and measurement method for concentration of particulate matters and gas | |
| CN104251842A (en) | Method for realization of online calibration of photoacoustic spectroscopy system pool constants by use of oxygen in atmosphere | |
| CN103364371A (en) | Novel differential measurement method of atmospheric aerosol absorption coefficient based on coaxial photo-thermal interference | |
| CN109724948A (en) | A kind of diesel emission test device and method based on single longitudinal mode frequency stabilized carbon dioxide laser | |
| CN103115877A (en) | Optical detection system for measuring concentrations of different gases | |
| CN101949825B (en) | Leaf water near infrared non-destructive testing device and method in light open environment | |
| CN112098335A (en) | Tunable resonance type photoacoustic cell | |
| CN102680412A (en) | Method for detecting concentration of trace steam by using photoacoustic spectrometry method | |
| CN204630919U (en) | A kind of based on enhancement mode transformer oil gas optoacoustic spectroscopy detection system | |
| CN109520967A (en) | The detection system and its detection method of trace heavy metal in a kind of food | |
| Ye et al. | Photoacoustic dual-gas sensor for simultaneous detection of hydrogen and water vapor | |
| CN102346133A (en) | Coalmine gas monitoring device and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Open date: 20060201 |