CN208060383U - Trace amounts of methane detector based on TDLAS - Google Patents
Trace amounts of methane detector based on TDLAS Download PDFInfo
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- CN208060383U CN208060383U CN201820228904.3U CN201820228904U CN208060383U CN 208060383 U CN208060383 U CN 208060383U CN 201820228904 U CN201820228904 U CN 201820228904U CN 208060383 U CN208060383 U CN 208060383U
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Abstract
The trace amounts of methane detector based on TDLAS that the utility model embodiment provides, belongs to laser gas detection field.The trace amounts of methane detector based on TDLAS, pass through the first photodetector and the second photodetector, effectively increase detection sensitivity and stability, by the reference gas chamber, methane gas absorption peak can be monitored in real time, to improve the detection limit of the methane detector, and pass through temperature sensing circuit, under test gas temperature can be monitored in real time, be used for the temperature-compensating of gas detection, further improved the measurement accuracy of system.
Description
Technical field
The utility model is related to laser gas detection fields, are detected in particular to the trace amounts of methane based on TDLAS
Instrument.
Background technology
The filed detection system device of current methane gas is based primarily upon the principles such as electric chemical formula, semiconductor-type.But this
The shortcomings of related sensor equipment of a little tradition sensing technologies all has short life, needs regular calibration, is not suitable for steady in a long-term
Monitoring and accuracy of detection are relatively low, therefore, how to solve the technical barrier that above-mentioned technical problem is current urgent need to resolve.
Utility model content
The purpose of this utility model is to provide the trace amounts of methane detectors based on TDLAS, can improve above-mentioned technology
Problem.
What the embodiments of the present invention were realized in：
A kind of trace amounts of methane detector based on TDLAS comprising light source, absorbs gas chamber, reference gas at fiber optic splitter
Room, the first photodetector, the second photodetector, current-to-voltage converting circuit and processor are equipped in the absorption gas chamber
Methane gas to be measured, the interior methane gas equipped with default purity of the reference gas chamber；Described in the light that the light source is sent out passes through
Fiber optic splitter is divided into first via light beam, the second road light beam and third road light beam, and the first via light beam passes through optical fiber incidence institute
The first photodetector is stated, second road light beam passes through the optical fiber successively incident reference gas chamber and second photodetection
Device, third road light beam pass through the incident absorption gas chamber of optical fiber；The current-to-voltage converting circuit is respectively with described first
Photodetector, second photodetector and absorption gas chamber connection, for obtaining first photodetector, institute
The second photodetector and the output current signal for absorbing gas chamber are stated, and the output current signal is switched into voltage letter
Number；The processor is coupled with the current-to-voltage converting circuit.
In the utility model preferred embodiment, above-mentioned light source is distributed feedback laser.
In the utility model preferred embodiment, above-mentioned further includes control circuit for light source, the control circuit for light source
Output end is coupled with the distributed feedback laser, and the input terminal of the control circuit for light source is coupled with the processor.
In the utility model preferred embodiment, above-mentioned further includes fibre optic isolater, one end of the fibre optic isolater
With the light source couples, the other end of the fibre optic isolater is coupled with the fiber optic splitter.
In the utility model preferred embodiment, above-mentioned further includes temperature sensing circuit, the temperature sensing circuit
One end is coupled with the processor, and the other end of the temperature sensing circuit is coupled with the absorption gas chamber.
In the utility model preferred embodiment, above-mentioned further includes the first vent line, first vent line
One end is coupled with the temperature sensing circuit, and the other end of first vent line is coupled with the absorption gas chamber.
In the utility model preferred embodiment, above-mentioned absorption gas chamber includes tail optical fiber end and current signal output end, institute
It states tail optical fiber end to couple with the fiber optic splitter, the current signal output end is coupled with the current-to-voltage converting circuit, institute
It is the input terminal for absorbing gas chamber to state tail optical fiber end, and the current signal output end is the output end for absorbing gas chamber.
In the utility model preferred embodiment, above-mentioned temperature sensing circuit is temperature detection chip.
In the utility model preferred embodiment, above-mentioned current-to-voltage converting circuit includes the first amplifier, the first electricity
Resistance, the first capacitance and rheostat, the noninverting input and reverse input end of first amplifier respectively with first light
Electric explorer, second photodetector and absorption gas chamber connection, the reverse input end difference of first amplifier
It is connect with one end of the rheostat and first capacitance, the rheostat is in parallel with first capacitance, the rheostat
It is connect respectively with the output end of first amplifier with the other end of first capacitance, one end of the first resistor and institute
The output end connection of the first amplifier is stated, the other end of the first resistor is coupled with the processor.
In the utility model preferred embodiment, above-mentioned current-to-voltage converting circuit further includes the second amplifier and third
The noninverting input of resistance, second amplifier is connect with the first resistor, one end of the 3rd resistor and described the
The output end of two amplifiers connects, and the other end of the 3rd resistor is coupled with the processor.
The advantageous effect of the utility model embodiment is：The trace first based on TDLAS that the utility model embodiment provides
Alkane detector effectively increases detection sensitivity and stability by the first photodetector and the second photodetector, passes through
The reference gas chamber can monitor methane gas absorption peak in real time, to improve the detection limit of the methane detector, and pass through
Temperature sensing circuit can monitor under test gas temperature in real time, be used for the temperature-compensating of gas detection, further improve system
Measurement accuracy.
Other feature and advantage of the utility model will illustrate in subsequent specification, also, partly from specification
It becomes apparent, or is understood by implementing the utility model embodiment.The purpose of this utility model and other advantages can
It realizes and obtains by specifically noted structure in the specification, claims and attached drawing write.
Description of the drawings
It, below will be to required use in embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment
Attached drawing be briefly described, it should be understood that the following drawings illustrates only some embodiments of the utility model, therefore should not be by
Regard the restriction to range as, for those of ordinary skill in the art, without creative efforts, may be used also
To obtain other relevant attached drawings according to these attached drawings.
Fig. 1 is the illustrative view of functional configuration for the trace amounts of methane detector based on TDLAS that the utility model embodiment provides；
Fig. 2 is the circuit diagram of the current-to-voltage converting circuit in the trace amounts of methane detector shown in FIG. 1 based on TDLAS.
Icon：Trace amounts of methane detectors of the 100- based on TDLAS；110- light sources；120- fiber optic splitters；130- inhales
Getter room；140- reference gas chambers；The first photodetectors of 150-；The second photodetectors of 160-；170- Current Voltages turn
Change circuit；180- processors；190- control circuit for light source；210- fibre optic isolaters；220- temperature sensing circuits；230-
First vent line.
Specific implementation mode
It is new below in conjunction with this practicality to keep the purpose, technical scheme and advantage of the utility model embodiment clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Usually here described in attached drawing and
The component of the utility model embodiment shown can be arranged and be designed with a variety of different configurations.
Therefore, the detailed description of the embodiments of the present invention to providing in the accompanying drawings is not intended to limit requirement below
The scope of the utility model of protection, but it is merely representative of the selected embodiment of the utility model.Based in the utility model
Embodiment, the every other embodiment that those of ordinary skill in the art are obtained without creative efforts, all
Belong to the range of the utility model protection.
It should be noted that：Similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined, then it further need not be defined and explained in subsequent attached drawing in a attached drawing.
It is in the description of the present invention, it should be noted that term "center", "upper", "lower", "left", "right", " perpendicular
Directly ", the orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, or
The utility model product using when the orientation or positional relationship usually put, be merely for convenience of description the utility model and letter
Change description, do not indicate or imply the indicated device or element must have a particular orientation, with specific azimuth configuration and
Operation, therefore should not be understood as limiting the present invention.In addition, term " first ", " second ", " third " etc. are only used for area
Divide description, is not understood to indicate or imply relative importance.
In addition, the terms such as term "horizontal", "vertical", " pendency " are not offered as requiring component abswolute level or pendency, and
It is that can be slightly tilted.It is not to indicate the structure if "horizontal" refers to only that its direction is more horizontal with respect to for "vertical"
It has to fully horizontally, but can be slightly tilted.
In the description of the present invention, it should also be noted that, unless otherwise clearly defined and limited, term " is set
Set ", " installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection,
Or it is integrally connected；It can be mechanical connection, can also be electrical connection；It can be directly connected, intermediary can also be passed through
It is indirectly connected, can be the connection inside two elements.For the ordinary skill in the art, it can be managed with concrete condition
Solve the concrete meaning of above-mentioned term in the present invention.
Embodiment
Please refer to Fig. 1 to Fig. 2, the trace amounts of methane detector 100 provided in this embodiment based on TDLAS comprising light source
110, fiber optic splitter 120, absorption gas chamber 130, reference gas chamber 140, the first photodetector 150, the second photodetector
160, current-to-voltage converting circuit 170, processor 180, control circuit for light source 190, fibre optic isolater 210, temperature sensing circuit
220 and first vent line 230.
In the present embodiment, the light source 110 is for providing light, and the light that the light source 110 is sent out is by the optical fiber point
Beam device 120 divides for first via light beam, the second road light beam and third road light beam, and the first via light beam passes through optical fiber incident described the
One photodetector 150, second road light beam are visited by the optical fiber successively incident reference gas chamber 140 and second photoelectricity
Survey device 160, third road light beam passes through the incident absorption gas chamber of optical fiber 130.
In this embodiment, it is preferred that the light source 110 is distributed feedback laser.By by distributed feedback laser
As the light source 110 so that after current-modulation, output wavelength is made to contain the Absorption Characteristics peak of methane gas.
In the present embodiment, by using distributed feedback laser as light source 110, with fiber optic splitter 120 by laser
Light beam coupling enters long light path and absorbs gas chamber 130, so that the trace amounts of methane detector 100 based on TDLAS is simple for structure, integrates
Degree is high, and then can effectively realize the high-precision on-line checking of methane gas, is suitable for coal mine, oil, chemical industry, steel and environment
Etc. the on-line checking of object gas in industries.Wherein, the TDLAS is the English contracting of tunable diode laser absorption spectroscopy
It writes.
In the present embodiment, the fiber optic splitter 120 be used for by the light that light source 110 is sent out be divided into first via light beam,
Second road light beam and third road light beam.
In the present embodiment, the fiber optic splitter 120 can be planar waveguide-type fiber splitter (PLCSplitter)
Or fused biconical taper optical splitter.Here, being not especially limited.
In the present embodiment, the absorption gas chamber 130 is coupled with the fiber optic splitter 120, for absorbing the optical fiber
The third road light beam that beam splitter 120 is sent out.
Wherein, the absorption gas chamber 130 includes tail optical fiber end and current signal output end, and the tail optical fiber end is divided with the optical fiber
Beam device 120 couples, and the current signal output end is coupled with the current-to-voltage converting circuit 170, and the tail optical fiber end is described
The input terminal of gas chamber 130 is absorbed, the current signal output end is the output end for absorbing gas chamber 130.
In the present embodiment, third road light beam is carried out by opto-electronic conversion by the absorption gas chamber 130, to export electricity
Signal is flowed to the current-to-voltage converting circuit 170.
In the present embodiment, gas chamber 130 is built-in methane gas to be measured for the absorption.
In the present embodiment, the absorption gas chamber 130 is low noise Maurice Herriott multiple reflectance cell, the absorption cell
One end is connected with a single-mode fiber, and the section single-mould fiber and 120 phase welding of fiber optic splitter.Light source 110 exports laser light
It can be inputted through this single mode optical fiber and enter absorption cell, and carry out multiple reflections.
In the present embodiment, the methane gas equipped with default purity in the reference gas chamber 140, wherein described default pure
Degree can also be 100% with 90%, here, being not especially limited.
Wherein, the input terminal of the reference gas chamber 140 is coupled with the output end of the fiber optic splitter 120, the reference
The output end of gas chamber 140 is coupled with second photodetector 160.
In the present embodiment, the second light beam that the fiber optic splitter 120 is sent out passes through the optical fiber successively incident ginseng
Examine gas chamber 140 and second photodetector 160.
In the present embodiment, first photodetector 150 by optical fiber for that will inject first photodetection
The first via light beam of device 150 carries out opto-electronic conversion, with output current signal.
Wherein, the input terminal of first photodetector 150 is connect with the first via light beam.First photoelectricity is visited
The output end for surveying device 150 is connect with the current-to-voltage converting circuit 170.
In this embodiment, it is preferred that first photodetector 150 is photon detector.Such as model AD230-
The photodetector of 8 or AD500-8.Here, being not especially limited.
In the present embodiment, second photodetector 160 by optical fiber for that will inject second photodetection
Second road light beam of device 160 carries out opto-electronic conversion, with output current signal.
Wherein, the input terminal of second photodetector 160 is connect with the reference gas chamber 140.Second photoelectricity
The output end of detector 160 is connect with the current-to-voltage converting circuit 170.
In this embodiment, it is preferred that second photodetector 160 is photon detector.Such as model AD230-
The photodetector of 8 or AD500-8.Here, being not especially limited.
In the present embodiment, the current-to-voltage converting circuit 170 respectively with first photodetector 150, described
Second photodetector 160 and the absorption gas chamber 130 connection.The current-to-voltage converting circuit 170 is for obtaining described state
First photodetector 150, second photodetector 160 and the output current signal for absorbing gas chamber 130, and by institute
It states output current signal and switchs to voltage signal.
In this embodiment, it is preferred that the quantity of the current-to-voltage converting circuit 170 be 3, be respectively used to it is described
First photodetector 150, second photodetector 160 and the absorption gas chamber 130 connection.
In the present embodiment, the current-to-voltage converting circuit 170 includes first port 1, second port 2, third port
3, the first amplifier U1, first resistor R1, the first capacitance C1, rheostat R2, the second amplifier U2 and 3rd resistor R3.
Wherein, the noninverting input of the first amplifier U1 is connect with the first port 1, and the first port 1 is used
It is described in being connect respectively with first photodetector 150, second photodetector 160 and the absorption gas chamber 130
The reverse input end of first amplifier U1 is connect with one end of the rheostat R2 and the first capacitance C1 respectively, the variable resistance
Device R2 is in parallel with the first capacitance C1, and the other end of the rheostat R2 and the first capacitance C1 is put with described first respectively
The output end connection of big device U1, reversed inputs of the rheostat R2 Jing Guo the second port 2 and the first amplifier U1
End connection, one end of the first resistor R1 are connect with the output end of the first amplifier U1, and the first resistor R1's is another
One end is connect with the noninverting input of the second amplifier U2, one end of the 3rd resistor R3 and the second amplifier U3
Output end connection, the other end of the 3rd resistor connect with the third port 3, and the third port 3 is used to connect institute
State processor 180.
In the present embodiment, the processor 180 is used to complete acquisition of the analog signal to digital signal, while according to light
Spectrum information is finally inversed by methane concentration.And the real time temperature in the absorption gas chamber 130 is obtained by temperature sensing circuit 220,
And temperature-compensating is carried out to the methane concentration in the absorption gas chamber 130.Specifically, the processor 180 receives the first via
Light beam, the second road light beam and the corresponding voltage signal of third road light beam, processing obtain corresponding three spectrum of three road light beams,
To three spectrum described in comparative analysis to calculate the concentration of methane gas in the absorption gas chamber 130.
In the present embodiment, the processor 180 can be general processor, including central processing unit (Central
Processing Unit, CPU), can also be digital signal processor (Digital Signal Processing, DSP), specially
With integrated circuit (Application Specific IntegratedCircuit, ASIC), ready-made programmable gate array
(Field Programmable Gate Array, FPGA) either other programmable logic device, discrete gate or transistor are patrolled
Collect device, discrete hardware components.
In the present embodiment, the model of the processor 180 can be STM32F103C8T6, can also be
STM32F103VET6 can also be stm32f107cct6 or 32 ARM microcontroller master board.Here, not making specific
It limits.
In the present embodiment, one end of the control circuit for light source 190 is coupled with the processor 180, the light source control
The other end of circuit 190 processed is coupled with the light source 110, and the control circuit for light source 190 is for controlling the transmitting of the light source 110
Go out default broadband light beam, for example, the broadband light beam of transmitting includes the characteristic absorption peak wavelength X 1=of methane gas
1650.9nm。
In the present embodiment, the control circuit for light source 190 is made of temperature control chip and current control chip.Its
In, it is preferable that the model MAX1978 of the temperature control chip, the model of the current control chip
ATL100MA10D。
In the present embodiment, one end of the fibre optic isolater 210 is coupled with the light source 110, the fibre optic isolater
210 other end is coupled with the fiber optic splitter 120.The fibre optic isolater 210 has unidirectional passability, only allows light beam
It is propagated to the direction far from light source 110, has obstructed the light beam of directive light source 110, to play the role of protecting light source 110.
In the present embodiment, the model of the fibre optic isolater 210 can be IO-H-1064 or IO-H-1550.?
This, is not especially limited.
In the present embodiment, one end of the temperature sensing circuit 220 is coupled with the processor 180, the temperature inspection
The other end of slowdown monitoring circuit 220 is coupled with the absorption gas chamber 130.The temperature sensing circuit 220 is used in the processor 180
Control under obtain it is described absorption gas chamber 130 in real time temperature, and to it is described absorption gas chamber 130 in methane concentration carry out
Temperature-compensating.
In the present embodiment, the temperature sensing circuit 220 is temperature detection chip, it is preferable that the temperature detection core
The model ADT7320 of piece.
In the present embodiment, one end of first vent line 230 is coupled with the temperature sensing circuit 220, described
The other end of first vent line 230 is coupled with the absorption gas chamber 130.
In conclusion the trace amounts of methane detector provided by the utility model based on TDLAS, is passed through by the light that light source is sent out
It crosses the fiber optic splitter and is divided into first via light beam, the second road light beam and third road light beam, the first via light beam passes through optical fiber
Incident first photodetector, second road light beam pass through the optical fiber successively incident reference gas chamber and second light
Electric explorer, third road light beam pass through the incident absorption gas chamber of optical fiber；The current-to-voltage converting circuit respectively with institute
The first photodetector, second photodetector and absorption gas chamber connection are stated, is visited for obtaining first photoelectricity
The output current signal of device, second photodetector and the absorption gas chamber is surveyed, and the output current signal is switched to
Voltage signal；The processor is coupled with the current-to-voltage converting circuit, to receive first via light beam, the second road light beam and
The corresponding information of voltage of three road light beams, processing obtain first via light beam, the second road light beam and corresponding three light of third road light beam
It composes, three spectrum described in comparative analysis calculate the concentration of methane gas in the absorption gas chamber.And then effectively increase detection
Sensitivity and stability, and methane gas absorption peak can be monitored in real time, further improve the detection limit of the methane detector.
The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this
For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model
Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.
Claims (10)
1. a kind of trace amounts of methane detector based on TDLAS, which is characterized in that including：Light source, fiber optic splitter, absorb gas chamber,
Reference gas chamber, the first photodetector, the second photodetector, current-to-voltage converting circuit and processor, the absorption gas chamber
It is built-in to have methane gas to be measured, the methane gas of default purity is housed in the reference gas chamber；The light warp that the light source is sent out
It crosses the fiber optic splitter and is divided into first via light beam, the second road light beam and third road light beam, the first via light beam passes through optical fiber
Incident first photodetector, second road light beam pass through the optical fiber successively incident reference gas chamber and second light
Electric explorer, third road light beam pass through the incident absorption gas chamber of optical fiber；The current-to-voltage converting circuit respectively with institute
The first photodetector, second photodetector and absorption gas chamber connection are stated, is visited for obtaining first photoelectricity
The output current signal of device, second photodetector and the absorption gas chamber is surveyed, and the output current signal is switched to
Voltage signal；The processor is coupled with the current-to-voltage converting circuit.
2. the trace amounts of methane detector according to claim 1 based on TDLAS, which is characterized in that the light source is distribution
Feedback laser.
3. the trace amounts of methane detector according to claim 2 based on TDLAS, which is characterized in that further include light source control
Circuit, the output end of the control circuit for light source are coupled with the distributed feedback laser, the input of the control circuit for light source
End is coupled with the processor.
4. the trace amounts of methane detector according to claim 1 based on TDLAS, which is characterized in that further include Fiber isolation
Device, one end of the fibre optic isolater and the light source couples, the other end of the fibre optic isolater and the fiber optic splitter
Coupling.
5. the trace amounts of methane detector according to claim 1 based on TDLAS, which is characterized in that further include temperature detection
Circuit, one end of the temperature sensing circuit are coupled with the processor, the other end of the temperature sensing circuit and the suction
Getter room couples.
6. the trace amounts of methane detector according to claim 5 based on TDLAS, which is characterized in that further include the first ventilation
One end of pipeline, first vent line is coupled with the temperature sensing circuit, the other end of first vent line with
The absorption gas chamber coupling.
7. the trace amounts of methane detector according to claim 1 based on TDLAS, which is characterized in that the absorption gas chamber packet
Include tail optical fiber end and current signal output end, the tail optical fiber end is coupled with the fiber optic splitter, the current signal output end with
The current-to-voltage converting circuit coupling, the tail optical fiber end are the input terminal for absorbing gas chamber, the current signal output end
For the output end for absorbing gas chamber.
8. the trace amounts of methane detector according to claim 5 based on TDLAS, which is characterized in that the temperature detection electricity
Road is temperature detection chip.
9. the trace amounts of methane detector according to claim 1 based on TDLAS, which is characterized in that the Current Voltage turns
It includes the first amplifier, first resistor, the first capacitance and rheostat to change circuit, the noninverting input of first amplifier and anti-
It is respectively connect to input terminal with first photodetector, second photodetector and the absorption gas chamber, it is described
The reverse input end of first amplifier is connect with one end of the rheostat and first capacitance respectively, the rheostat and institute
The parallel connection of the first capacitance is stated, the other end of the rheostat and first capacitance connects with the output end of first amplifier respectively
Connect, one end of the first resistor is connect with the output end of first amplifier, the other end of the first resistor with it is described
Processor couples.
10. the trace amounts of methane detector according to claim 9 based on TDLAS, which is characterized in that the Current Voltage turns
It further includes the second amplifier and 3rd resistor to change circuit, and noninverting input and the first resistor of second amplifier connect
Connect, one end of the 3rd resistor is connect with the output end of second amplifier, the other end of the 3rd resistor with it is described
Processor couples.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820228904.3U CN208060383U (en) | 2018-02-08 | 2018-02-08 | Trace amounts of methane detector based on TDLAS |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820228904.3U CN208060383U (en) | 2018-02-08 | 2018-02-08 | Trace amounts of methane detector based on TDLAS |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113092378A (en) * | 2021-04-16 | 2021-07-09 | 中国科学院长春光学精密机械与物理研究所 | Laser gas detection device |
| CN114235018A (en) * | 2021-12-09 | 2022-03-25 | 山东微感光电子有限公司 | Temperature-adaptive FBG demodulation method and system |
-
2018
- 2018-02-08 CN CN201820228904.3U patent/CN208060383U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113092378A (en) * | 2021-04-16 | 2021-07-09 | 中国科学院长春光学精密机械与物理研究所 | Laser gas detection device |
| CN114235018A (en) * | 2021-12-09 | 2022-03-25 | 山东微感光电子有限公司 | Temperature-adaptive FBG demodulation method and system |
| CN114235018B (en) * | 2021-12-09 | 2023-08-08 | 山东微感光电子有限公司 | Temperature-adaptive FBG demodulation method and system |
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