CN206161524U - TDLAS gas concentration detection system - Google Patents
TDLAS gas concentration detection system Download PDFInfo
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- CN206161524U CN206161524U CN201621041041.6U CN201621041041U CN206161524U CN 206161524 U CN206161524 U CN 206161524U CN 201621041041 U CN201621041041 U CN 201621041041U CN 206161524 U CN206161524 U CN 206161524U
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Abstract
The utility model relates to a TDLAS gas concentration detection system, the instrument includes emission unit, transmission unit, receiving element and a central processing unit, emission unit includes signal generator, laser -driven board and laser instrument, the transmission unit includes laser aligner, gas absorption pond and gas circuit system, receiving element includes photoelectric detector, preamplifier and lock -in amplifier. This system uses the TDLAS technique as theoretical foundation, combines reflection pond and harmonic detection technique, has realized the functions such as the monitoring of real -time concentration, the demonstration of concentration data storage of ammonia, the easy operation of this system for diesel engine ammonia pollution application execution field provides solid technical foundation, realizes detecting among the diesel engine ammonium discharge assessment system, and improvement system by a wide margin detects precision and response speed, and reduce discharging research and the environmental monitoring provides the new tool for the diesel engine.
Description
Technical field
The utility model belongs to gas concentration detection apparatus technical field, and especially (tunable diode swashs a kind of TDLAS
Optical absorption spectra) gas concentration detection system.
Background technology
At present, the raising with personal average income level and the cheaper of vehicle price, the recoverable amount of automobile continues,
Rapidly increase, wherein diesel powered car is widely used with the low advantage of its oil consumption.But it is main in diesel emission tail gas
The composition such as the particulate matter to be contained (PM) and nitrogen oxides (NOx) can do great damage to environment, be to reduce nitrogen oxides
(NOx) this contaminant exclusion larger to environmental hazard, typically takes method of denitration to reduce nitrogen oxides.Generally adopt urea
SCR technology of the solution as reducing agent.The method is to be pyrolyzed into ammonia using urea liquid, and NOx is being urged with ammonia in exhaust
Nitrogen and water are generated in the presence of agent.Excessive urea liquid can be typically sprayed during reality to be guaranteed in tail gas
NOx is reduced completely, but thus can cause to carry NH in tail gas3, the NH of discharge3New environmental pollution is caused again, if not spraying
Excessive urea liquid, can be such that the nitrogen oxides not reduced completely effectively removes again, therefore need to diesel engine vent gas
NH in denitration SCR reduction3Concentration carry out high accuracy real-time detection.
In addition, ammonia is toxic gas a kind of colourless and with penetrating odor, people, animal, plant can be caused sternly
The harm of weight.Reflectivity breathing can be caused under high concentration environment is in stop or cardiac arrest.Exposure concentration is 553mg/m^3
Strong impulse symptom can be caused, a length of 1.25 minutes when can tolerate, can be caused under 3500～7000mg/m^3 concentration environments
It is dead immediately.External ammonia due to its characterization of adsorption, often in skin surface and eye conjunctiva, the moisture in absorptive tissue, draw by absorption
Histone denaturation, tissue fat saponification are played, membrane structure is destroyed, causes inflammation and corresponding disease of skin.A small amount of suction
Entering ammonia can stimulate even corrosion person's windpipe mucosal tissue, cause human body respiration to infect, and benumb respiratory tract cilium and damage viscous
Film epithelial tissue, weakens the resistance against diseases of human body.If ammonia suction enters blood in vivo and by alveolar, can be with hemoglobin knot
Close, destroy the fortune oxygen function of blood.Substantial amounts of suction ammonia can cause cough, dizziness, headache, vomiting, weak etc., and cause and exhale
Distress Syndrome is inhaled, while causing pulmonary edema.If suction excess of ammonia gas, the reflex that can cause trigeminal neuralgia tip is injured
The immune system of human body, nerve, angiocarpy and internal organ, serious meeting causes death.For a long time under containing ammonia environment, can make
Obtain human body skin and the symptoms such as pigment deposition or digital ulcer occur.
Additionally, ammonia can cause severe contamination to environment.The ammonium that sour gas neutralization reaction in ammonia and air is generated
Salt, is one of the reason for Atmospheric Grains (PM2.5) are formed, and the phenomenons such as photochemical fog, acid rain can be caused to produce.Ammonia
The particle suction human body of formation can constitute a threat in lung's accumulation to health；In an atmosphere because its extinction can reduce energy
Degree of opinion；Being deposited to ground can make forest decay, waters eutrophication and soil acidification.Therefore, denitration SCR is carried out to diesel engine
The high accuracy of escape ammonia, high precision test are particularly important in technical process.
Therefore, a kind of new gas concentration acquisition instrument is needed badly.
By retrieval, the patent publication us related to present patent application are not yet found.
The content of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art part, there is provided a kind of TDLAS gas concentrations detection
System, the system can carry out escape ammonia during denitration SCR technology to diesel engine to be carried out high accuracy, accurately examines
Survey.
The utility model realize technical scheme that goal of the invention adopted for：
A kind of TDLAS gas concentration detection systems, the instrument include transmitter unit, transmission unit, receiving unit and in
Central Processing Unit；
The transmitter unit includes signal generator, Laser Driven plate and laser instrument, the output end of the signal generator
Be connected setting with the input of Laser Driven plate, and the output end of the Laser Driven plate is connected with the input of laser instrument and sets
Put；
The transmission unit includes laser aligner, gas absorption cell and air-channel system, the input of the laser aligner
The setting that is connected with the output end of laser instrument, the output end of the laser aligner is held to be connected with the input of gas absorption cell and set
Put, the gas absorption cell is connected setting with air-channel system；
The receiving unit include photodetector, preamplifier and lock-in amplifier, the photodetector it is defeated
Enter to hold the setting that is also connected with the output end of gas absorption cell, the output end of the photodetector and the input of preamplifier
Be connected setting, and the output end of the preamplifier is connected setting with the input of lock-in amplifier；
The CPU includes data collecting card and host computer, and input and the lock of the data collecting card are mutually put
The output end of big device is connected setting, and the output end of the data collecting card is connected setting with the input of host computer；
The output end of the signal generator is also connected setting with the input of lock-in amplifier, signal generator output
Sine wave provides reference signal for lock-in amplifier；
To Laser Driven plate output signal, the Laser Driven plate receives signal and drives laser instrument defeated the signal generator
Go out laser, laser emitting laser is monitored by laser aligner to the gas in gas absorption cell, the laser after monitoring
Received by photodetector and be converted into electric signal, carry GAS ABSORPTION information electric signal it is premenstrual put amplifier amplify after by
Lock-in amplifier demodulates second harmonic signal, and using data collecting card data signal is obtained, and is carried out using host computer follow-up
Analyzing and processing is finally inversed by tested gas concentration value.
And, model TFG6930A that the signal generator is adopted is independent two-channel digital signal generator, two
The frequency of road output signal, amplitude and skew can link, and output can be superimposed；The built-in 5 kinds of reference waveforms of TFG6930A and 50
Kind of random waveform, the amplitude characteristic of 10Vp-p and the rate-adaptive pacemaker of highest 30MHz, also the amplitude resolution with 0.2mV and
The frequency resolution of 1uHz；
The signal generator output scanning signal amplitude is 200mV, and frequency is 5Hz, and modulated signal amplitude is 600mV,
Frequency is 30kHz；
The Laser Driven plate includes laser current driving plate and laser temperature driving plate, and driving current is 50mA, temperature
For 29 DEG C, wherein, laser current driving plate model LDX-3100 is a exclusively for semiconductor laser with tunable offer drive
The circuit-board card of streaming current, point constant current and permanent energy both of which, for the driving current that diode provides 0～250mA of scope；Laser
Temperature-driven plate model LDT-5100；
The laser instrument uses the distributed feedback type semiconductor laser of Wuhan Odie company butterfly encapsulation, and wavelength is
1512nm, light intensity is 4.97dB, and peak width is less than 0.2nm.
And, the gas absorption cell material is made using monel metal, absorption pond length be 0.5m, light path after turning back
Length is 1m, and two ends adopt CaF2Materials optical window, is adapted to infrared light, and using the space structure at 10 ° of inclination angles；
The gas absorption cell is using right-angle prism structure as reflecting element.
And, the photodetector is the PD500 indium gallium arsenic photodiodes of Wuhan Odie company；
What the preamplifier was selected is the preamplifier of the DLPCA-200 models of FEMTO companies production；
The FEMTO companies production list LIA-MVD-200-H that the lock-in amplifier is selected.
And, the data collecting card uses the data collecting cards of NI 9222 of NI companies of U.S. production；It is described upper
Machine is acquired using LabVIEW2012 softwares to two-way waveform, and subsequent treatment is carried out to data using Matlab programs.
And, the transmission unit also includes sample gas filter plant and tail gas treatment device, the air-channel system and sample gas
The output end of filter plant is connected setting, and the output end of the air-channel system is connected with the input of tail gas treatment device and sets
Put, the sample gas filter plant can filter out particulate matter and greasy dirt in sample gas, the tested gas after filtration enters gas circuit system
In system, tail gas enters tail gas treatment device, discharges Jing after tail gas treatment device process.
And, the inlet end of the gas absorption cell is connected setting by ball valve, pressure-reducing valve with air-channel system, the gas
The inlet end of absorption cell also passes through ball valve, pressure-reducing valve and zero gas phase connect setting, between the inlet end and ball valve of gas absorption cell
Pressure gauge with negative pressure is set, and the outlet side of the gas absorption cell is connected setting by ball valve with air pump, and the air pump can be by gas
Gas in body absorption cell is extracted out.
The utility model obtain advantage and good effect be：
1st, the system, with reference to reflection tank and harmonic detecting technique, realizes the reality of ammonia with TDLAS technologies as theoretical foundation
When concentration monitor, concentration data storage show etc. function；The system operatio is simple, is that diesel engine ammonia pollution detection application is carried
Solid technical foundation is supplied, has realized detecting appraisement system in diesel engine emission intensity, greatly improved system detectio precision with response
Speed, is that diesel emission abatement research and environmental monitoring provide new tool.
2nd, the gas absorption cell of the system employs in recent years emerging right-angle prism structure as reflecting element, the element without
Fine adjustment is needed, it is easy to operate and shock resistance is non-in the case where larger space is moved all without the optical reflection of the system of impact
Chang Hao.It is demonstrated experimentally that this gas absorption cell only need to be adjusted to detector one end, and it is easy to operate, with reference to off-axis paraboloidal mirror
Detected using light beam is converged to into vertical direction, be effectively reduced light intensity loss.As shown in Fig. 2 Fig. 2 is the system light
The schematic diagram on road, laser injects laser filled with tested gas absorption cell after collimater focusing, and light is through the flat of angle cube
Row reflex focuses on reception again by after absorption cell by off-axis paraboloidal mirror.The optical signals for carrying GAS ABSORPTION information are visited
Survey device and be converted to output after electric signal.
Description of the drawings
Fig. 1 is the structure connection diagram of the system；
Fig. 2 is the schematic diagram of the light path of the system；
Fig. 3 is the gas absorption cell of the system and the structure connection diagram of air-channel system.
Specific embodiment
With reference to embodiment, the utility model is further illustrated；Following embodiments are illustrative, are not limited
, it is impossible to protection domain of the present utility model is limited with following embodiments.
A kind of TDLAS gas concentration detection systems, as shown in figure 1, the instrument includes transmitter unit, transmission unit, connect
Receive unit and CPU；
The transmitter unit includes signal generator, Laser Driven plate and laser instrument, the output end of the signal generator
Be connected setting with the input of Laser Driven plate, and the output end of the Laser Driven plate is connected with the input of laser instrument and sets
Put；
The transmission unit includes laser aligner, gas absorption cell and air-channel system, the input of the laser aligner
The setting that is connected with the output end of laser instrument, the output end of the laser aligner is held to be connected with the input of gas absorption cell and set
Put, the gas absorption cell is connected setting with air-channel system；
The receiving unit include photodetector, preamplifier and lock-in amplifier, the photodetector it is defeated
Enter to hold the setting that is also connected with the output end of gas absorption cell, the output end of the photodetector and the input of preamplifier
Be connected setting, and the output end of the preamplifier is connected setting with the input of lock-in amplifier；
The CPU includes data collecting card and host computer, and input and the lock of the data collecting card are mutually put
The output end of big device is connected setting, and the output end of the data collecting card is connected setting with the input of host computer；
The output end of the signal generator is also connected setting with the input of lock-in amplifier, signal generator output
Sine wave provides reference signal for lock-in amplifier；
To Laser Driven plate output signal, the Laser Driven plate receives signal and drives laser instrument defeated the signal generator
Go out laser, laser emitting laser is monitored by laser aligner to the gas in gas absorption cell, the laser after monitoring
Received by photodetector and be converted into electric signal, carry GAS ABSORPTION information electric signal it is premenstrual put amplifier amplify after by
Lock-in amplifier demodulates second harmonic signal, and using data collecting card data signal is obtained, and is carried out using host computer follow-up
Analyzing and processing is finally inversed by tested gas concentration value.
The system, with reference to reflection tank and harmonic detecting technique, realizes the real-time of ammonia with TDLAS technologies as theoretical foundation
The functions such as concentration monitor, concentration data storage display；The system operatio is simple, provides for diesel engine ammonia pollution detection application
Solid technical foundation, realizes detecting appraisement system in diesel engine emission intensity, greatly improves system detectio precision with response speed
Degree, is that diesel emission abatement research and environmental monitoring provide new tool.
In the present embodiment, model TFG6930A that the signal generator is adopted, is a independent two-channel digital
Signal generator, the frequency of two-way output signal, amplitude and skew can link, and output can be superimposed.Signal is sent out in the system
Raw device output scanning signal amplitude is 200mV, and frequency is 5Hz, and modulated signal amplitude is 600mV, and frequency is 30kHz.
The built-in 5 kinds of reference waveforms of TFG6930A and 50 kinds of random waveforms, the amplitude characteristic of 10Vp-p and the frequency of highest 30MHz it is defeated
Go out, also there is in addition the amplitude resolution of 0.2mV and the frequency resolution of 1uHz.
The Laser Driven plate includes laser current driving plate and laser temperature driving plate, and driving current is 50mA, temperature
For 29 DEG C, wherein, laser current driving plate model LDX-3100 is a exclusively for semiconductor laser with tunable offer drive
The circuit-board card of streaming current, point constant current and permanent energy both of which provide high stable, the low noise of 0～250mA of scope for diode
Driving current；Laser temperature driving plate model LDT-5100, is a according to paltie effect, using thermistor as anti-
Road is fed back to, the temperature control panel of accurate low noise, high stability is provided for semiconductor laser with tunable using hot spot module
Card.The Bipolar current of electrothermal module output can simultaneously meet laser instrument heating and the needs for freezing, while using controlling back
Road can quickly be corrected to temperature, it is ensured that output temperature it is reliable and stable, by rotating the potentiometer or outer on board
Connecing reference resistance can easily set temperature required.
Distributed Feedback Laser has butterfly encapsulation and TO to encapsulate two kinds of forms, and the system laser instrument uses Wuhan Odie company
Distributed feedback (DFB) semiconductor laser of butterfly encapsulation, wavelength is 1512nm, and light intensity is 4.97dB, and peak width is less than
0.2nm.The laser of laser instrument output first passes through laser aligner and is focused collimation, and light input part is carried out by five times regualting frame
Accurate adjustment so that laser can precisely be detected through the hot spot of certain space propagation by photodetector.
In the present embodiment, the gas absorption cell material is made using monel metal, be one kind with metallic nickel as base
The single phase solid solution alloy of the high intensity of other elements such as body addition copper, iron, manganese.The material is in hydrofluoric acid, fluorine gas medium
And all there is excellent corrosion resistance and with stress corrosion cracking (SCC) is not produced under alkaline matrix, the advantages of cutting ability is good,
It is especially suitable for argoshield pond material.Absorption pond length is 0.5m, and optical path length is 1m after turning back, and two ends adopt CaF2Material light
Window is learned, is adapted to infrared light, and using the space structure at 10 ° of inclination angles, the etalon for effectively avoiding reflecting interference from causing
Interference.
The gas absorption cell of the system employs in recent years emerging right-angle prism structure as reflecting element, and the element need not
Fine adjustment, in the case where larger space is moved all without the optical reflection of the system of impact, easy to operate and shock resistance is very
It is good.It is demonstrated experimentally that this gas absorption cell only need to be adjusted to detector one end, easy to operate, making with reference to off-axis paraboloidal mirror
Detected with light beam is converged to into vertical direction, be effectively reduced light intensity loss.As shown in Fig. 2 Fig. 2 is the system light path
Schematic diagram, laser through collimater focusing after, laser is injected filled with tested gas absorption cell, light is through the parallel of angle cube
Reflex focuses on reception again by after absorption cell by off-axis paraboloidal mirror.Carry the optical signals detection of GAS ABSORPTION information
Device is converted to and exported after electric signal.
In the present embodiment, the photodetector is the signal detection part in experimental system, can be inhaled through gas
The optical signal of receives pond is converted to current signal.The system selects the PD500 indium gallium arsenic photodiodes of Wuhan Odie company, photosensitive
The a diameter of 0.3mm of sensitive surface, responsiveness is 0.9 or so.With spectrum response wide ranges (cover 900 to 1600nm),
The features such as dark current is low, reliability is higher.
What preamplifier was selected is the preamplifier of the DLPCA-200 models of FEMTO companies production, its electric current conversion
Coefficient is from 1 × 103～1 × 1011V/A, precision is 1%, it is adaptable to the frequency bandwidth from direct current to 500kHz, low noise and adjustable
Bias, ± 3kV transient protectives etc. make the amplifier more adapt in harmonic detecting system low current signal to voltage signal
Amplify conversion requirement.
The FEMTO companies production list LIA-MVD-200-H that lock-in amplifier is selected, it is small volume, lightweight, it is easy to integrated；
The bnc interface and knob switch of standard and selection key, it is simple to operate；The multi signal output of X, Y, R enriches the selection of user；
Also there is wide frequency range (50Hz～120kHz), input current scope (30p～10 μ A) and voltage range (3 μ V～1V) are wide；
The coefficients such as sensitivity, headroom, phase adjustment precision, detection accuracy, response time are the advantage of higher level.
In the present embodiment, the data collecting card uses the data collecting cards of NI 9222 of NI companies of U.S. production.
It is the high-speed synchronous analog acquisition card of 16, and its highest sample rate is 500kSa/S, and analog input channel is 4 tunnels, resolution ratio
It it is 16, its input voltage is ± 10V.Two passages, sample rate 3kSa/S are adopted in system；Utilize in host computer
LabVIEW2012 softwares are acquired to two-way waveform, and subsequent treatment is carried out to data using Matlab programs.
In the present embodiment, the transmission unit also includes sample gas filter plant and tail gas treatment device, the gas circuit system
System is connected setting with the output end of sample gas filter plant, the output end of the air-channel system and the input of tail gas treatment device
Be connected setting, and the sample gas filter plant can filter out particulate matter and greasy dirt in sample gas, and the tested gas after filtration enters
In entering air-channel system, tail gas enters tail gas treatment device, discharges Jing after tail gas treatment device process.
Filtration core material adopts alundum (Al2O3) with silica for main matrix in sample gas filter critical component
Agglomerated material, to NH3It is lost relatively low in gas pretreatment filtration, and can significantly drops the low particulate matter of burning and greasy dirt interference.
As shown in figure 3, the inlet end of the gas absorption cell is connected setting by ball valve, pressure-reducing valve with air-channel system,
The inlet end of the gas absorption cell is also by ball valve, pressure-reducing valve and zero gas phase connect setting, the inlet end and ball of gas absorption cell
Pressure gauge with negative pressure is set between valve, and the outlet side of the gas absorption cell is connected setting by ball valve with air pump, the air pump
Gas in gas absorption cell can be extracted out, combination pressure is apparent to examine negative pressure in pond, helps void gas in pond are more effective
Discharge.
The workflow of the system is substantially：Driver Card drives laser instrument output laser, to the gas in gas absorption cell
Body is monitored, and host computer carries out total system monitoring.The system carries out the process of gas concentration detection：1. laser instrument output
Wave-length coverage is selected according to the manufacture craft with reference to manufacturer that needs of tested gas, recycles tunable laser
The centre wavelength of diode shoot laser is positioned at tested GAS ABSORPTION peak 1512nm vicinity by temperature coarse adjustment function.2. it is sharp
Light device provides a sawtooth waveforms low-frequency modulation signal, modulates the absworption peak of optical maser wavelength slowly scanned gas；Superposition one in addition
Individual sine wave high-frequency modulated signal is used for producing harmonic modulation signal.3. the laser light incident that laser instrument sends is to being connected with tested gas
Gas absorption cell, laser receives by photodetector and is converted into electric signal Jing after the cubic structure reflected in parallel of angle.4. carry
Premenstrual the putting after amplifier amplifies of electric signal for having GAS ABSORPTION information demodulates second harmonic signal by lock-in amplifier, using number
Data signal is obtained according to capture card, follow-up analyzing and processing is carried out using host computer and is finally inversed by tested gas concentration value.
Claims (6)
1. a kind of TDLAS gas concentration detection systems, it is characterised in that：The system includes transmitter unit, transmission unit, reception
Unit and CPU；
The transmitter unit include signal generator, Laser Driven plate and laser instrument, the output end of the signal generator with swash
The input of optical drive plate is connected setting, and the output end of the Laser Driven plate is connected setting with the input of laser instrument；
The transmission unit include laser aligner, gas absorption cell and air-channel system, the input of the laser aligner with
The output end of laser instrument is connected setting, and the output end of the laser aligner is connected setting with the input of gas absorption cell,
The gas absorption cell is connected setting with air-channel system；
The receiving unit includes photodetector, preamplifier and lock-in amplifier, the input of the photodetector
Also be connected setting with the output end of gas absorption cell, and the output end of the photodetector is connected with the input of preamplifier
Connect setting, the output end of the preamplifier is connected setting with the input of lock-in amplifier；
The CPU includes data collecting card and host computer, the input and lock-in amplifier of the data collecting card
Output end be connected setting, the output end of the data collecting card is connected setting with the input of host computer；
The output end of the signal generator is also connected setting with the input of lock-in amplifier, and signal generator output is sinusoidal
Ripple provides reference signal for lock-in amplifier；
To Laser Driven plate output signal, the Laser Driven plate receives signal and drives laser instrument output to swash the signal generator
Light, laser emitting laser is monitored by laser aligner to the gas in gas absorption cell, and the laser after monitoring is by light
Electric explorer receives and is converted into electric signal, carry GAS ABSORPTION information electric signal it is premenstrual put amplifier amplify after by lock phase
Amplifier demodulates second harmonic signal, and using data collecting card data signal is obtained, and using host computer follow-up analysis is carried out
Process is finally inversed by tested gas concentration value.
2. TDLAS gas concentration detection systems according to claim 1, it is characterised in that：The signal generator is adopted
Model TFG6930A, be independent two-channel digital signal generator, the frequency of two-way output signal, amplitude and skew can be with
Linkage, output can be superimposed；The built-in 5 kinds of reference waveforms of TFG6930A and 50 kinds of random waveforms, the amplitude characteristic of 10Vp-p and
The rate-adaptive pacemaker of highest 30MHz, the also frequency resolution of the amplitude resolution with 0.2mV and 1uHz；
Signal generator output scanning signal amplitude is 200mV, and frequency is 5Hz, and modulated signal amplitude is 600mV, frequency
For 30kHz；
The Laser Driven plate includes laser current driving plate and laser temperature driving plate, and driving current is 50mA, and temperature is 29
DEG C, wherein, laser current driving plate model LDX-3100 is that a offer exclusively for semiconductor laser with tunable drives electricity
The circuit-board card of stream, point constant current and permanent energy both of which, for the driving current that diode provides 0～250mA of scope；Laser temperature
Driving plate model LDT-5100；
The laser instrument uses the distributed feedback type semiconductor laser of Wuhan Odie company butterfly encapsulation, and wavelength is
1512nm, light intensity is 4.97dB, and peak width is less than 0.2nm.
3. TDLAS gas concentration detection systems according to claim 1, it is characterised in that：The gas absorption cell material
Made using monel metal, absorption pond length is 0.5m, optical path length is 1m after turning back, and two ends adopt CaF2Materials optical
Window, is adapted to infrared light, and using the space structure at 10 ° of inclination angles；
The gas absorption cell is using right-angle prism structure as reflecting element.
4. TDLAS gas concentration detection systems according to claim 1, it is characterised in that：The photodetector is force
The PD500 indium gallium arsenic photodiodes of Chinese Odie company；
What the preamplifier was selected is the preamplifier of the DLPCA-200 models of FEMTO companies production；
The FEMTO companies production list LIA-MVD-200-H that the lock-in amplifier is selected.
5. TDLAS gas concentration detection systems according to any one of Claims 1-4, it is characterised in that：The transmission is single
Unit also includes sample gas filter plant and tail gas treatment device, and the air-channel system is connected with the output end of sample gas filter plant and sets
Put, the output end of the air-channel system is connected setting with the input of tail gas treatment device, the sample gas filter plant can be filtered
The particulate matter and greasy dirt in sample gas is removed, the tested gas after filtration is entered in air-channel system, and tail gas enters tail gas treatment device,
Discharge Jing after tail gas treatment device process.
6. TDLAS gas concentration detection systems according to any one of Claims 1-4, it is characterised in that：The gas is inhaled
The inlet end of receives pond is connected setting by ball valve, pressure-reducing valve with air-channel system, and the inlet end of the gas absorption cell also passes through ball
Valve, pressure-reducing valve and zero gas phase connect setting, arrange the pressure gauge with negative pressure, the gas between the inlet end and ball valve of gas absorption cell
The outlet side of body absorption cell is connected setting by ball valve with air pump, and the air pump can extract out the gas in gas absorption cell.
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| CN111982849A (en) * | 2020-07-15 | 2020-11-24 | 国网山东省电力公司电力科学研究院 | Online calibration system and method for ammonia escape analysis instrument |
| CN114034660A (en) * | 2021-12-03 | 2022-02-11 | 福建美营自动化科技有限公司 | Gas detection system and method based on TDLAS |
| CN117629894A (en) * | 2024-01-26 | 2024-03-01 | 安徽中科智泰光电测控科技有限公司 | Tunable semiconductor laser multi-gas detection equipment |
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