CN108732130A - Increase the gas-detecting device of the direct absorption spectrometry of light path using polarizer - Google Patents
Increase the gas-detecting device of the direct absorption spectrometry of light path using polarizer Download PDFInfo
- Publication number
- CN108732130A CN108732130A CN201810261180.7A CN201810261180A CN108732130A CN 108732130 A CN108732130 A CN 108732130A CN 201810261180 A CN201810261180 A CN 201810261180A CN 108732130 A CN108732130 A CN 108732130A
- Authority
- CN
- China
- Prior art keywords
- prism
- total reflection
- glan
- gas
- light
- 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.)
- Granted
Links
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
- G01N21/25—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
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Optics & Photonics (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
Increase the gas-detecting device of the direct absorption spectrometry of light path using polarizer, belongs to gas concentration detection field.Including semiconductor laser, Glan prism etc., laser controller connects semiconductor laser, electrooptic modulator is placed after semiconductor laser, Glan prism a, automatically controlled Polarization Controller, convergent lens, gas chamber and Glan prism b are sequentially placed after electrooptic modulator, total reflection prism a is placed in after the o light-emitting faces of Glan prism b, total reflection prism b is placed after the exit facet of total reflection prism a, the exit facet of total reflection prism b is located at before the o light incident surfaces of Glan prism a, and multiple reflections chamber is formed by Glan prism a, b and total reflection prism a, b；The e light-emitting face postposition photodetectors of Glan prism b, the input terminal of photodetector output termination oscillograph, the input terminal of the output termination electrooptic modulator of signal generator one, another output terminate automatically controlled Polarization Controller.The device has many advantages, such as simple in structure, optical length.
Description
Technical field
The present invention relates to a kind of gas-detecting devices of the direct absorption spectrometry of long light path, specifically be a kind of use
Polarizer increases the gas-detecting device of the direct absorption spectrometry of light path.Belong to Gas Thickness Detecting Technology field.
Background technology
With the progress of economic fast development and science and technology, in the technical industries such as agricultural, the energy, coal mine, electric power, material
It is required for carrying out all kinds of gases the measurement of high-resolution, high stability.Optical gas sensor originates from 70 years last century
In generation, has been widely used for the detection of all kinds of gases at present.Optical gas sensor has many unique advantages, such as selectively
By force, fast, electromagnetism interference of detection speed etc..
Currently used optical gas sensor detection technique mainly has direct absorption spectrum detection technique, wavelength modulation light
Compose detection technique and optoacoustic spectroscopy detection technique.Direct absorption spectrum detection technique has simple in structure, easy to implement, at low cost
The advantages that, it has been used widely.The signal magnitude of direct absorption spectrum detection technique has prodigious relationship with light path is absorbed,
Therefore in order to which the detection for further increasing direct absorption spectrum detection technique is horizontal, most efficient method is the limited sky in gas chamber
Interior increase absorbs light path, and currently used gas chamber has common transmission-type and reflective gas chamber and multiple reflections formula
The ponds White and Herriott pool structures.Common transmission-type and reflective gas chamber are although simple in structure, but absorption light path is short,
Although the ponds White and Herriott pool structures have long light path, complicated and of high cost.
《Acta Optica》, 2010, the phase of volume 30 12, author Pei Shixin, Cui Fenping, was turned into justice, Lee by 3655-3659 pages
It passes, it is entitled《Water vapor detecting research based on integral chamber output spectrum technology》Article propose a kind of to be based on tunable semiconductor
Integral chamber output spectrum (TDLICOS) system of laser, after laser coupled to absorption cell, it will in intracavitary multiple reflections,
To obtain very long absorption light path, but the integral chamber cost of manufacture in the system structure is high, and manufacture difficulty is big.
Invention content
In order to overcome the deficiencies of existing technologies and insufficient, the present invention proposes a kind of increasing the straight of light path using polarizer
The gas-detecting device for connecing absorption spectrometry controls reflection and transmission of the light on Glan prism by the polarization state of change light,
Absorption light path is increased, to improve detection sensitivity.
The technical solution adopted by the present invention is as follows：
A kind of gas-detecting device for the direct absorption spectrometry increasing light path using polarizer, including semiconductor laser
Device, electrooptic modulator, Glan prism a, signal generator, automatically controlled Polarization Controller, convergent lens, gas chamber, Glan prism b, light
Electric explorer, oscillograph, total reflection prism a, total reflection prism b, laser controller, it is characterised in that laser controller connects
Semiconductor laser is connect, electrooptic modulator is placed behind semiconductor laser, Glan prism is sequentially placed behind electrooptic modulator
A, automatically controlled Polarization Controller, convergent lens, gas chamber and Glan prism b, total reflection prism a are placed in the o light-emitting faces of Glan prism b
Behind, total reflection prism b is placed behind the exit facet of total reflection prism a, the exit facet of total reflection prism b is located at Glan prism
Before the o light incident surfaces of a, multiple reflections chamber is formed by Glan prism a, b and total reflection prism a, b；The e light of Glan prism b goes out
It penetrates and places photodetector behind face, the input terminal of the output termination oscillograph of photodetector, one of signal generator
Output end connects the input terminal of electrooptic modulator, and another output end of signal generator is connected to the input of automatically controlled Polarization Controller
End.
The Glan prism a and b is identical glan-foucault prism.
Two total reflection prism a are identical with b, and cross section is isosceles right triangle.
The absorption peak wavelength of the centre wavelength of the semiconductor laser and tested gas is equal.
Apparatus of the present invention work when, laser controller drive semiconductor laser, the light that semiconductor laser is sent out into
Enter electrooptic modulator to be closed, electrooptic modulator is defeated after signal generator control electrooptic modulator sends out a square wave
The light gone out enters Glan prism a, o light and is totally reflected, and e light enters the intracavitary of multiple reflections chamber, into intracavitary e light by automatically controlled
When Polarization Controller, signal generator is sent out after a signal makes e light be changed into o light, and signal generator is closed, from
The o light of automatically controlled Polarization Controller outgoing assembles laggard air inlet chamber, the gas molecules sorb laser energy in gas chamber by convergent lens
Amount after the o light being emitted from gas chamber is incident on Glan prism b, and is reflected on total reflection prism a by Glan prism b, is all-trans
The o light that prism a is reflected is penetrated to be incident on total reflection prism b, after by total reflection prism b reflect, be incident on Glan prism a
On, signal generator is constantly in closed state at this time, and o light constantly moves in circles in the intracavitary of multiple reflections chamber, in gas chamber
Constantly by gas molecules sorb, after repeatedly moving in circles, signal generator sends out a signal, makes by automatically controlled Polarization Control
The o light of device is changed into e light, is exported from Glan prism b, and photodetector is detected to obtain incident optical signal and is converted into
Electric signal is shown on oscillograph, records square wave size at this time.The square wave size and device of record are subtracted with original square wave size
Part is lost, and is exactly the size of measured gas concentration.
Advantageous effect caused by gas concentration detection is carried out using apparatus of the present invention to be：Chamber of the light in multiple reflections chamber
It is interior constantly to move in circles, achieve the purpose that increase light path.
Present system has many advantages, such as that simple in structure, optical length, detection sensitivity are high.
Description of the drawings
Fig. 1 is the structural schematic diagram of detecting system of the present invention.
Wherein：1, semiconductor laser, 2, electrooptic modulator, 3, Glan prism a, 4, signal generator, 5, automatically controlled polarization
Controller, 6, convergent lens, 7, gas chamber, 8, Glan prism b, 9, photodetector, 10, oscillograph, 11, total reflection prism a,
12, total reflection prism b, 13, laser controller.
Specific implementation mode
The invention will be further described with reference to the accompanying drawings and examples, but not limited to this.
Embodiment 1：
Increase the gas-detecting device of the direct absorption spectrometry of light path using polarizer as shown in Figure 1.Including partly leading
Body laser 1, electrooptic modulator 2, Glan prism a3, signal generator 4, automatically controlled Polarization Controller 5, convergent lens 6, gas chamber 7,
Glan prism b8, photodetector 9, oscillograph 10, total reflection prism a11, total reflection prism b12, laser controller 13,
It is characterized in that laser controller 13 connects semiconductor laser 1, electrooptic modulator 2, electric light is placed behind semiconductor laser 1
Glan prism a3, automatically controlled Polarization Controller 5, convergent lens 6, gas chamber 7 and Glan prism b8 are sequentially placed behind modulator 2, entirely
Reflecting prism a11 is placed in behind the o light-emitting faces of Glan prism b8, is placed and is all-trans behind the exit facet of total reflection prism a11
Prism b12 is penetrated, the exit facet of total reflection prism b12 is located at before the o light incident surfaces of Glan prism a3, by Glan prism a3, b8
Multiple reflections chamber is formed with total reflection prism a11, b12；Photodetector 9 is placed behind the e light-emitting faces of Glan prism b8,
The input terminal of the output termination oscillograph 10 of photodetector 9, an output termination electrooptic modulator 2 of signal generator 4
Input terminal, another output of signal generator 4 terminate the input terminal of automatically controlled Polarization Controller 5.
The Glan prism a and b is identical glan-foucault prism.
Two total reflection prism a are identical with b, and cross section is isosceles right triangle.
The centre wavelength of the semiconductor laser is 1370nm, the absorption peak of corresponding vapor.
Embodiment 2：
Identical with embodiment 1, only the centre wavelength of the semiconductor laser is 1653nm, corresponding methane gas
Absorption peak.
Embodiment 3：
Identical with embodiment 1, only the centre wavelength of the semiconductor laser is 1530nm, the absorption of corresponding acetylene
Peak.
Claims (4)
1. a kind of gas-detecting device for the direct absorption spectrometry increasing light path using polarizer, including semiconductor laser
Device, electrooptic modulator, Glan prism a, signal generator, automatically controlled Polarization Controller, convergent lens, gas chamber, Glan prism b, light
Electric explorer, oscillograph, total reflection prism a, total reflection prism b, laser controller, it is characterised in that laser controller connects
Semiconductor laser is connect, electrooptic modulator is placed behind semiconductor laser, Glan prism is sequentially placed behind electrooptic modulator
A, automatically controlled Polarization Controller, convergent lens, gas chamber and Glan prism b, total reflection prism a are placed in the o light-emitting faces of Glan prism b
Behind, total reflection prism b is placed behind the exit facet of total reflection prism a, the exit facet of total reflection prism b is located at Glan prism
Before the ο light incident surfaces of a, multiple reflections chamber is formed by Glan prism a, b and total reflection prism a, b；The e light of Glan prism b goes out
It penetrates and places photodetector behind face, the input terminal of the output termination oscillograph of photodetector, one of signal generator
Output end connects the input terminal of electrooptic modulator, and another output end of signal generator is connected to the input of automatically controlled Polarization Controller
End.
2. a kind of gas detection of direct absorption spectrometry being increased light path using polarizer as described in claim 1 is filled
It sets, it is characterised in that the Glan prism a and b is identical glan-foucault prism.
3. a kind of gas detection of direct absorption spectrometry being increased light path using polarizer as described in claim 1 is filled
It sets, it is characterised in that two total reflection prism a are identical with b, and cross section is isosceles right triangle.
4. a kind of gas detection of direct absorption spectrometry being increased light path using polarizer as described in claim 1 is filled
It sets, it is characterised in that the absorption peak wavelength of the centre wavelength of the semiconductor laser and tested gas is equal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810261180.7A CN108732130B (en) | 2018-03-27 | 2018-03-27 | Gas detection device of direct absorption spectroscopy method adopting polarizing device to increase optical path |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810261180.7A CN108732130B (en) | 2018-03-27 | 2018-03-27 | Gas detection device of direct absorption spectroscopy method adopting polarizing device to increase optical path |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108732130A true CN108732130A (en) | 2018-11-02 |
| CN108732130B CN108732130B (en) | 2020-02-21 |
Family
ID=63940558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810261180.7A Expired - Fee Related CN108732130B (en) | 2018-03-27 | 2018-03-27 | Gas detection device of direct absorption spectroscopy method adopting polarizing device to increase optical path |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108732130B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04273399A (en) * | 1991-02-27 | 1992-09-29 | Nohmi Bosai Ltd | Method and device for fire discrimination |
| CN102262061A (en) * | 2011-04-26 | 2011-11-30 | 中国人民解放军军事医学科学院卫生装备研究所 | Method and device for detecting concentration of chlorine dioxide gas on line |
| US20120170043A1 (en) * | 2010-09-09 | 2012-07-05 | Adelphi University | Sensitive and Compact Sensor Employing a Visible Diode Laser and A High Finesse Optical Cavity for Trace Gas Detection (NO2) |
| CN204287030U (en) * | 2014-04-17 | 2015-04-22 | 王胤 | The system of detection paramagnetic molecular gas |
| CN204314209U (en) * | 2014-12-17 | 2015-05-06 | 邓文平 | sample measuring cell |
-
2018
- 2018-03-27 CN CN201810261180.7A patent/CN108732130B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04273399A (en) * | 1991-02-27 | 1992-09-29 | Nohmi Bosai Ltd | Method and device for fire discrimination |
| US20120170043A1 (en) * | 2010-09-09 | 2012-07-05 | Adelphi University | Sensitive and Compact Sensor Employing a Visible Diode Laser and A High Finesse Optical Cavity for Trace Gas Detection (NO2) |
| CN102262061A (en) * | 2011-04-26 | 2011-11-30 | 中国人民解放军军事医学科学院卫生装备研究所 | Method and device for detecting concentration of chlorine dioxide gas on line |
| CN204287030U (en) * | 2014-04-17 | 2015-04-22 | 王胤 | The system of detection paramagnetic molecular gas |
| CN204314209U (en) * | 2014-12-17 | 2015-05-06 | 邓文平 | sample measuring cell |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108732130B (en) | 2020-02-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105911020B (en) | Method for simultaneously measuring multi-component gas based on cavity ring-down spectroscopy | |
| CN105021588B (en) | A kind of single light source CARS gas-detecting devices and method | |
| CN100468049C (en) | Detection method for Optical-fiber transmitting infrared absorption type methane gas | |
| CN101256140A (en) | Portable apparatus and measuring method for monitoring gas concentration of sulphur dioxide and nitrous oxide meanwhile | |
| CN101545856A (en) | Fibre optic gas detector for fire hazard of coal gab area | |
| CN101819064A (en) | Normal-temperature normal-pressure femto-second CARS (Coherent Anti-stokes Raman Spectroscopy) time-resolved spectrum measuring system | |
| CN103364371B (en) | The absorption coefficient of atmospheric aerosol Novel differential measurement method of coaxial-type photothermal interference | |
| CN209148538U (en) | A kind of gas detecting system based on infrared absorption spectrum | |
| CN103630523A (en) | Laser induction spectrum generating device used for water quality optical analyzer | |
| CN105158199A (en) | Device for testing absorption response of terahertz waves in different gas environments | |
| CN103411921A (en) | Handheld gas sensing system based on optical remote measuring lenses | |
| CN108519349A (en) | Oil field gas injection multielement hot fluid component CO2And H2O concentration on-line checking experimental provisions | |
| CN203672786U (en) | Dual-wavelength-modulation photoelectric detection device for trace materials | |
| CN201844972U (en) | Harmful gas concentration detector | |
| CN205607812U (en) | Particle size detection device | |
| CN106290253A (en) | A kind of optical-fiber type sensor measuring relative humidity in air | |
| CN105021569A (en) | Device for simultaneously monitoring carbon monoxide and methane | |
| CN108732130A (en) | Increase the gas-detecting device of the direct absorption spectrometry of light path using polarizer | |
| CN101710068B (en) | Fiber gas sensor based on Fourier transform spectrometry | |
| CN104034685A (en) | Enhanced absorption type gas detection system | |
| CN103411922A (en) | Handheld gas sensing system based on optical remote measuring lens | |
| CN201867365U (en) | Saturated absorption spectrum device based on internal surface reflection of atomic gas sample cell | |
| CN203385658U (en) | Handheld gas sensing system based on optimal remote sensing lens | |
| CN206161525U (en) | Hygrometry's optic fibre type sensor in measurement air | |
| CN104568751A (en) | Optical ring-down cavity surface plasmon resonance sensor demodulation device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200221 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |