CN206862883U - Detection means based on TDLAS trace CO gas concentrations - Google Patents
Detection means based on TDLAS trace CO gas concentrations Download PDFInfo
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- CN206862883U CN206862883U CN201720521107.XU CN201720521107U CN206862883U CN 206862883 U CN206862883 U CN 206862883U CN 201720521107 U CN201720521107 U CN 201720521107U CN 206862883 U CN206862883 U CN 206862883U
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Abstract
The utility model is the device based on the detection of TDLAS trace CO gas concentrations, solves prior art measurement CO gas concentration values and the problem of deviation, measurement result reliability is low occurs.Detection means includes function signal generator, laser, collimater, flowmeter, air pump, herriott absorption cells, temperature sensor, pressure sensor, condenser lens, photodetector, preamplifier, digital lock-in amplifier, microprocessor and computer；Correcting module is provided with microprocessor, correcting module is used to be modified the gas concentration value detected；Detection means and method are mainly used in the real-time automatic monitoring of trace CO gases, it is possible to prevente effectively from causing personnel to be poisoned to death the generation of accident by CO gases.
Description
Technical field
It the utility model is related to gas concentration detection field, and in particular to one kind is examined based on TDLAS trace CO gas concentrations
The device of survey.
Background technology
CO gases are a kind of colourless, tasteless toxic gases, and trace CO is that concentration is less than 10 in air-6Gas.CO is dense
The height of degree is whether chemical industry, colliery occur one of important symbol of disaster, and the major reason for causing personnel to be poisoned to death.
Therefore CO concentration is accurately detected particularly significant.
The method of detection gas is roughly divided into two kinds.One kind is traditional gas detection method, and another kind is optical detection side
Method.Traditional gas detection method includes chemical analysis and chromatography, and chemical analysis can only be at laboratory or progress scene
The quantitative analysis of initial characterization, the operation level for analyzing personnel directly affect the precision of measurement, and can only detect one by one it is single into
Point, analysis is time-consuming, it is impossible to which gas real-time online is detected；Chromatography is compared with chemical analysis, so that its analysis time is short, efficiency
The advantages that high, high sensitivity by extensive use, but this method often to detect mobile phase, operability and stability by
To influence, it is unfavorable for analyzing gas in real time.With being continuously increased for gas on-line monitoring technique demand, emerge in recent years
The rapid development that spectroscopy detection technique obtains, it has quick, accurate, contactless detection characteristic, wherein tunable
Diode Laser Absorption Spectroscopy (TDLAS) has extraordinary applicability and versatility, and detection speed is fast, sensitivity
Height, the contactless monitoring in real time of high accuracy of gas can be achieved.
TDLAS is a kind of measuring method of detection gas.The technology can realize the on-line measurement of gas, it is not necessary to take
Sample and pretreatment, instrument can be directly mounted at scene, and measurement sensitivity is high, fast response time, nowadays the technology oneself in many
Field is commonly used, such as poisonous gas leakage caused by oil, chemical industry is detected, the tail gas real-time telemetry of motor vehicle emission
And the measurement to engine combustion efficiency, gas pollutant monitoring etc. caused by Metallurgical Factory, power plant combustion.Further, since can
The measurement response of tuning semiconductor laser absorption spectroscopy is very rapid, with reference to modulated spectrum technology and long light path technology, just
It can measure less than 10-6The gas concentration of rank, the online gas trace detection requirement of industry spot can be met, but when measurement
When temperature pressure atmosphere factor in scene is unstable, the breadth of spectrum line and amplitude of gas can all change, and cause what is measured
There is deviation in gas concentration value, and measurement result reliability is low.Therefore the amendment of trip temperature pressure must be entered to gas concentration.
Utility model content
There is the problem of deviation, measurement result reliability is low, this practicality to solve prior art measurement CO gas concentration values
It is new to provide a kind of accurate detectable concentration size, improve the detection based on TDLAS trace CO gas concentrations of detection reliability
Device.
To achieve these goals, the utility model uses following technical proposals：
A kind of detection means based on TDLAS trace CO gas concentrations, including function signal generator, laser, collimation
It is device, flowmeter, air pump, herriott absorption cells, temperature sensor, pressure sensor, condenser lens, photodetector, preposition
Amplifier, digital lock-in amplifier, microprocessor and computer；The output end of function signal generator respectively with laser sum
The input connection of word lock-in amplifier；Laser is connected by optical fiber with collimater；Collimater is arranged on herriott absorptions
In input path before the entry port in pond；Flowmeter is connected to herriott absorption cell air inlets in turn with air pump by appendix
At mouthful；The probe of temperature sensor is arranged in herriott absorption cells, and the output end of temperature sensor is connected with microprocessor,
Pressure sensor is arranged on the gas outlet of herriott absorption cells, and pressure sensor output end is connected with microprocessor；It is poly-
Focus lens are arranged on the emitting light path of herriott absorption cell exit ports；Photodetector is arranged on the focus of condenser lens
Place, the output end of photodetector and the input of preamplifier connect；The output end of preamplifier is put with digital servo-control
The input connection of big device；The output end of digital lock-in amplifier is connected with microprocessor；Microprocessor and computer communication link
Connect, correcting module is provided with microprocessor, the correcting module is used to be modified the gas concentration value detected；Laser
Light portal, the light of collimater enters hole and light portals, the light of herriott absorption cells enters hole and light portals is arranged at always
On line.
Further, to improve the accuracy of detection, laser is Distributed Feedback Laser, and herriott absorption cells are long light path
Absorption cell.
Further, to improve the accuracy of detection, photodetector uses indium gallium arsenic sensor.
Further, function signal generator model AFG3052C.
Further, microprocessor uses STM32 single-chip microcomputers.
Further, temperature sensor WSB-5-H2, pressure sensor MY-YBS-C.
The beneficial effects of the utility model are：
1. the detection means is mainly used in the real-time automatic monitoring of trace CO gases, it is possible to prevente effectively from being caused by CO gases
Personnel be poisoned to death the generation of accident.The utility model is simple in construction, and cost is low, and stability is high, with reference to long light path technology with
And wavelength-modulation technique, the gas accuracy of detection of system is substantially increased, high spirit can be realized to trace gas using TDLAS technologies
Sensitivity, high precision test.
2. correction formula substantially increases the accuracy of CO Concentration Testing results；Temperature pressure correction formula can effectively drop
The influence that low environment factor detects to gas, greatly improve the measurement accuracy of system.
3. accurate, real-time, integration, online, non-contact air detection means.Tunable diode laser absorption spectroscopy point
Analysis (TDLAS) technology is to realize the new pattern laser spectrographic technique of highly sensitive gas trace detection, due to " fingerprint " of molecular spectrum
Feature, this method are not disturbed by other gases, and this characteristic has obvious advantage compared with other methods, have it is non-contact,
Quickly, efficiently, high selectivity, high sensitivity and the advantages that real time on-line monitoring.
4. tunable diode laser absorption spectroscopy technology (TDLAS) can realize the high sensitivity of gas, high-resolution
Non-contact detection.But second harmonic signal can change with the change of temperature in environment and pressure, cause measured value to occur
Larger error, the utility model can realize that temperature influences to be corrected in real time with pressure to caused by concentration in environment, so as to
Further improve the accuracy of gas detection.
Brief description of the drawings
Fig. 1 is the schematic diagram of the utility model TDLAS trace CO gas concentration detection systems；
Fig. 2 is the flow chart of the utility model TDLAS trace CO gas concentration detection methods.
Reference：1- function signal generators, 2-DFB lasers, 3- optical fiber, 4- collimaters, 5- flowmeters, 6- gas
Pump, 7-herriott absorption cells, 8- temperature sensors, 9- pressure sensors, 10- condenser lenses, 11- photodetectors, before 12-
Put amplifier, 13- digital lock-in amplifiers, 14- microprocessors, 15- computers, 16- optical mirror slips.
Embodiment
The utility model provides a kind of on-line measuring device and detection method based on TDLAS trace CO concentration gases,
Real-time temperature pressure amendment is carried out to the gas concentration detected.First by wavelength-modulation technique, laser is launched
Wavelength locking near CO absworption peaks, last Computer display goes out CO gas concentration values to be measured, for accurate detectable concentration
Size, the utility model add system debugging functions.
Detecting system based on TDLAS trace CO gas concentrations as shown in Figure 1, including function signal generator 1, DFB
Laser 2, collimater 4, flowmeter 5, air pump 6, herriott absorption cells 7, temperature sensor 8, pressure sensor 9, focusing are saturating
Mirror 10, photodetector 11, preamplifier 12, digital lock-in amplifier 13, microprocessor 14 and computer 15；Function signal
The output end of generator 1 is connected with Distributed Feedback Laser 2 and the input of digital lock-in amplifier 13 respectively；Distributed Feedback Laser 2 and collimation
Device 4 is connected by optical fiber 3；Collimater 4 is arranged in the input path before the entry port of herriott absorption cells 7；Flowmeter 5
It is connected in turn with air pump 6 by appendix at the air inlet of herriott absorption cells 7；The probe of temperature sensor 8 is arranged on
In herriott absorption cells 7, the output end of temperature sensor 8 is connected with microprocessor 14, and pressure sensor 9 is arranged on
The gas outlet of herriott absorption cells 7, the output end of pressure sensor 9 are connected with microprocessor 14；In herriott absorption cells 7
Provided with optical mirror slip 16, laser is projected after the optical mirror slip in pond repeatedly refraction from exit ports, and condenser lens 10 is arranged on
On the emitting light path of the exit ports of herriott absorption cells 7；Shoot laser is radiated at photodetector 11 by condenser lens 10
On, the output end of photodetector 11 is connected with the input of preamplifier 12；The output end of preamplifier 12 and numeral
The input connection of lock-in amplifier 13；The output end of digital lock-in amplifier 13 is connected with microprocessor 14；Microprocessor 14
Output end is connected by data wire with the input of computer 15, and microprocessor 14 is provided with correcting module, and correcting module is used for inspection
The gas concentration value measured is modified, and correcting module is included different temperature and pressure, and corresponding different temperatures and pressure
CO gas concentration normalizing value application MATLAB multinomials under by force obtain correcting public affairs after carrying out three-dimensional data fitting through mathematic(al) manipulation
Formula
C (0)=C (xy)/(0.615-0.0015x+0.0175y-5.438 × 10-6x2-0.00011xy-0.000025y2-
2.9255×10-7x2y+3.3185×10-6xy2-3.292×10-6y3) revision program,
Wherein：
X represents pressure values (kPa) in absorption cell；
Y represents temperature value (DEG C) in absorption cell；
C (xy) represents the gas concentration value (ppm) under different temperatures pressure before correcting；
C (0) represents the gas concentration value (ppm) under normal temperature and pressure after correcting.
In order to ensure that the shoot laser of Distributed Feedback Laser 2 can be received by photodetector 11, the light of Distributed Feedback Laser 2 goes out
Hole, the light of collimater 4 enter hole and light portals, the light of herriott absorption cells 7 enters hole and light portals is respectively provided with the same line.
Distributed Feedback Laser 2 can produce the laser of any wavelength between 750nm -3000nm, have very high side mould suppression
System than with good monochromaticjty, the spectrum analysis be especially suitable for gas.Function signal generator 1 uses model
AFG3052C function signal generator.Temperature sensor 8 is using model WSB-5-H2 temperature sensor, pressure sensor
9 use model MY-YBS-C pressure sensor.Digital lock-in amplifier 13 uses SR850 digital lock-in amplifiers.Micro- place
Manage device 14 and use STM32 single-chip microcomputers.Herriott absorption cells 7 use the basic long light path gas absorption cells of GW-1020D, GW-
The basic long light path gas absorption cells of 1020D enter its interior gas to being fully absorbed in the laser of its interior multiple reflections, then will have
With light signal output.Photodetector 11 uses indium gallium arsenic sensor, and indium gallium arsenic sensor is not limited in the utility model, should also
This, which includes other, can convert optical signals to the photodetector of electric signal.Miscellaneous part in the utility model is not limited to above-mentioned
Specific model, can also other conventional products with identical function be used to substitute.
Function signal generator 1 is connected by RF connection with Distributed Feedback Laser 2 and digital lock-in amplifier 13, function
Signal generator sends modulated signal and incident laser is adjusted into entering for reference wavelength (wavelength i.e. near CO absworption peaks) all the way
Laser is penetrated, sinusoidal signal is sent into digital lock-in amplifier 13 as regulation reference signal by another way；Collimater 4 is used for optical fiber
The diverging light maximal efficiency of 3 outflows is coupled into absorption cell light entrance；Flowmeter 5 controls to be treated in herriott absorption cells 7
The size of gas inlet flow is surveyed, under test gas is filled with absorption cell by air pump 6；Temperature sensor 8 is used to gather herriott suctions
Temperature in receives pond, pressure sensor 9 are used to gather pressure in herriott absorption cells, and temperature sensor 8 will with pressure sensor 9
The data feedback of collection is to microprocessor 14；Incident laser, which is absorbed by the CO in herriott absorption cells 7 and is converted into outgoing, to swash
Light；Condenser lens 10 is used for injection photodetector 11 after scattered shoot laser convergence；Photodetector 11 will
The laser of the injection of herriott absorption cells 7 is simultaneously converted into electric signal；Preamplifier 12 is used for export photodetector 11
Electric signal is amplified；Digital lock-in amplifier 13 is used for LPF, weak signal extraction and harmonic detecting, to complete
The collection and processing of second harmonic；Microprocessor 14 be used to carrying out the second harmonic signal of lock-in amplifier output A/D conversions,
Inverting is carried out to gas concentration, A/D conversions are carried out to temperature pressure signal；And gas concentration is modified, after then correcting
Concentration signal send computer 15 to, computer 15 shows gas concentration value.
As shown in Fig. 2 the detection method based on TDLAS trace CO gas concentrations, comprises the following steps：
1) incident laser is adjusted to the incident laser of reference wavelength (wavelength i.e. near CO absworption peaks)：
Microprocessor 14 control laser electric current and temperature by wavelength locking caused by Distributed Feedback Laser 2 for incident laser
Reference wavelength, the i.e. centre frequency of Distributed Feedback Laser 2 are positioned near gas absworption peak；Due to the CO spectral line strength ratios at 2332nm
High two orders of magnitude at 1568nm, so centre wavelength caused by Distributed Feedback Laser 2 is positioned near 2332nm, and will
2332nm is defined as reference wavelength；
2) incident laser after adjustment is collimated by collimater 4, the incident laser after collimation is injected into herriott and inhaled
Receives pond 7, after multiple reflections, incident laser is absorbed by the CO in herriott absorption cells 7 and is converted into shoot laser, passes through
Condenser lens 10 irradiates；The pressure and temperature value in absorption cell are measured using temperature sensor 8 and pressure sensor 9；
3) shoot laser is converted into electric signal, and electric signal is amplified：
The shoot laser that the herriott absorption cells 7 collected project is converted into electric signal by photodetector 11, then
Electric signal is sent to preamplifier 12；Because electric signal is very faint, preamplifier 12 is amplified to electric signal first,
I.e. by the power amplification of electric signal to the receptible input power range of digital lock-in amplifier institute；
4) function of digital lock-in amplifier 13 is realized using FPGA, to carry out LPF, micro- to the electric signal of input
Weak electric signal extracts and harmonic detecting, to complete second harmonic collection and extraction；
5) 14STM32 types microprocessor carries out A/D conversions to second harmonic, carries out inverting to gas concentration, is corrected
Gas concentration value C (xy) under preceding different temperatures pressure, A/D conversions are carried out to the temperature and pressure signal of measurement, obtain temperature
Value y and pressure values x；
6) to gas concentration amendment；The revision program of correcting module is write in the STM32 single-chip microcomputers of microprocessor, according to
Gas concentration value C (xy), temperature value y and the pressure values x that step 5) obtains are dense to gas caused by temperature, pressure change in real time
Degree deviation is modified, and then improves the degree of accuracy to the detection of trace CO gases：
Specially：Gather the temperature and pressure values under synchronization, and corresponding temperature and the CO gas concentrations under pressure
Value；Enter trip temperature, pressure, the three-dimensional data fitting of normalization CO concentration using MATLAB multinomials；Fitted by comparative analysis
Multigroup relational expression, obtain the synthetic relationship formula between a CO Pressure, Concentration, Temperature pressure；Due to dense under different temperatures pressure
Degree can all be converted into the concentration value under normal temperature and pressure, and correction formula, different temperatures are obtained through mathematic(al) manipulation to the multinomial of fitting
Concentration value conversion under concentration value and normal temperature and pressure under pressure can be realized by following formula:
C (0)=C (xy)/(0.615-0.0015x+0.0175y-5.438 × 10-6x2-0.00011xy-0.000025y2-
2.9255×10-7x2y+3.3185×10-6xy2-3.292×10-6y3)
Wherein：
X represents pressure values (kPa) in absorption cell；
Y represents temperature value (DEG C) in absorption cell；
C (xy) represents the gas concentration value (ppm) under different temperatures pressure before correcting；
C (0) represents the gas concentration value (ppm) under normal temperature and pressure after correcting；
Revised gas concentration value is can obtain x, y, C (xy) in correction formula write-in program, is inputted respectively.
7) revised gas concentration value is shown, concentration signal is finally sent to computer 15, passes through LabVIEW8.6
Host computer shows CO concentration values.
Detection means based on above-mentioned t unable filter (TDLAS) can realize under test gas
High sensitivity, high-resolution non-contact detection.But second harmonic signal can occur with the change of temperature in environment and pressure
Change, cause measured value larger error occur, the utility model can realize temperature and pressure shadow to caused by concentration in environment
Sound is corrected in real time, so as to further improve the accuracy of gas detection.The monitoring system and monitoring method are mainly used in trace
Measure the real-time automatic monitoring of CO gases, the generation of accident it is possible to prevente effectively from the personnel as caused by CO gases are poisoned to death, profit
The influence that environmental factor detects to gas can effectively be reduced by being monitored value amendment with temperature pressure correction formula, be greatly improved
The measurement accuracy of system.The utility model is simple in construction, and cost is low, and stability is high, is modulated with reference to long light path technology and wavelength
Technology, substantially increase the gas accuracy of detection of system.
The utility model can also be used for the detection of other gas concentrations.
The scope of protection of the utility model is not limited to specific embodiment of the present utility model, for the skill of the art
For art personnel, under enlightenment of the present utility model, can from this patent disclosure directly export associate some principles and
Structure identical basic deformation, or the replacement of known technology is commonly used in the prior art, and the mutually different combination of feature identical,
The technical characteristic of same or similar technique effect simply changes, especially the application technology and product in coal spontaneous combustion, belongs to this
The protection domain of utility model technology.
Claims (6)
- A kind of 1. detection means based on TDLAS trace CO gas concentrations, it is characterised in that：Including function signal generator, swash Light device, collimater, flowmeter, air pump, herriott absorption cells, temperature sensor, pressure sensor, condenser lens, photoelectricity are visited Survey device, preamplifier, digital lock-in amplifier, microprocessor and computer；Input of the output end of function signal generator respectively with laser and digital lock-in amplifier is connected；Laser passes through Optical fiber is connected with collimater；Collimater is arranged in the input path before the entry port of herriott absorption cells；Flowmeter with Air pump is connected in turn at herriott absorption cell air inlets by appendix；The probe of temperature sensor is arranged on herriott In absorption cell, the output end of temperature sensor is connected with microprocessor, and pressure sensor is arranged on the gas of herriott absorption cells Body exit, pressure sensor output end are connected with microprocessor；Condenser lens is arranged on herriott absorption cell exit ports Emitting light path on；Photodetector is arranged on the focal point of condenser lens, the output end and preamplifier of photodetector Input connection；The output end of preamplifier and the input of digital lock-in amplifier connect；Digital lock-in amplifier Output end is connected with microprocessor；Microprocessor is communicated to connect with computer, and correcting module, the amendment are provided with microprocessor Module is used to be modified the gas concentration value detected；The light of laser, which portals, the light of collimater enters hole and light portals, the light of herriott absorption cells enters hole and light portals is all provided with Put on the same line.
- 2. the detection means according to claim 1 based on TDLAS trace CO gas concentrations, it is characterised in that：Laser For Distributed Feedback Laser, herriott absorption cells are long path cell.
- 3. the detection means according to claim 1 or 2 based on TDLAS trace CO gas concentrations, it is characterised in that：Photoelectricity Detector uses indium gallium arsenic sensor.
- 4. the detection means according to claim 3 based on TDLAS trace CO gas concentrations, it is characterised in that：Function is believed Number generator model AFG3052C.
- 5. the detection means according to claim 4 based on TDLAS trace CO gas concentrations, it is characterised in that：Microprocessor Device uses STM32 single-chip microcomputers.
- 6. the detection means according to claim 5 based on TDLAS trace CO gas concentrations, it is characterised in that：Temperature passes Sensor is WSB-5-H2, pressure sensor MY-YBS-C.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108333143A (en) * | 2018-02-06 | 2018-07-27 | 山东省科学院海洋仪器仪表研究所 | A kind of vapour concentration measurement modification method based on tunable diode laser absorption spectrometry |
| CN109001154A (en) * | 2018-06-13 | 2018-12-14 | 贾良权 | The efficient measuring system of seed vitality based on laser absorption spectroscopy |
| CN112798550A (en) * | 2021-04-14 | 2021-05-14 | 四川大学 | Wide-measurement-range laser absorption spectrum combustion diagnosis method |
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2017
- 2017-05-11 CN CN201720521107.XU patent/CN206862883U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108333143A (en) * | 2018-02-06 | 2018-07-27 | 山东省科学院海洋仪器仪表研究所 | A kind of vapour concentration measurement modification method based on tunable diode laser absorption spectrometry |
| CN108333143B (en) * | 2018-02-06 | 2020-08-04 | 山东省科学院海洋仪器仪表研究所 | Water vapor concentration measurement correction method based on tunable laser absorption spectrum |
| CN109001154A (en) * | 2018-06-13 | 2018-12-14 | 贾良权 | The efficient measuring system of seed vitality based on laser absorption spectroscopy |
| CN109001154B (en) * | 2018-06-13 | 2021-04-09 | 湖州师范学院 | Efficient seed vigor measuring system based on laser absorption spectrum technology |
| CN112798550A (en) * | 2021-04-14 | 2021-05-14 | 四川大学 | Wide-measurement-range laser absorption spectrum combustion diagnosis method |
| CN112798550B (en) * | 2021-04-14 | 2021-07-13 | 四川大学 | Wide-measurement-range laser absorption spectrum combustion diagnosis method |
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