CN209624385U - A kind of fiber gas sensor laser wavelength precision monitoring device - Google Patents
A kind of fiber gas sensor laser wavelength precision monitoring device Download PDFInfo
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- CN209624385U CN209624385U CN201822100566.8U CN201822100566U CN209624385U CN 209624385 U CN209624385 U CN 209624385U CN 201822100566 U CN201822100566 U CN 201822100566U CN 209624385 U CN209624385 U CN 209624385U
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- wavelength
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Abstract
The utility model discloses a kind of fiber gas sensor laser wavelength precision monitoring devices, by the way that the local sample gas gas chamber equipped with tested gas sample is arranged, and the fraction of laser light that semiconductor laser issues is separated into local sample gas gas chamber by optical splitter, by being transmitted to photodiode two after being tested the decaying of gas sample, amplified be transmitted in processor is analyzed, whether the wavelength that processor can be made accurately to measure semiconductor laser shifts, and the wavelength that can control TEC temperature-control circuit noise spectra of semiconductor lasers accordingly is adjusted, the wavelength of semiconductor laser is set to return exactly to the correct wavelength value of test macro requirement again, to guarantee the measurement accuracy of fiber gas sensor.
Description
Technical field
The utility model relates to gas detection technology fields, and in particular to a kind of fiber gas sensor laser wavelength essence
Close monitoring device.
Background technique
The energy is the important material base of human survival and development, is related to national economy and national security.In the energy
During exploitation utilizes, production safety becomes an important topic in economic development.In recent years, safety in production is given by country
Great attention, industrial accident total amount is on a declining curve, but severe and great casualty takes place frequently and endangers serious.In China's coal
Charcoal field, gas and spontaneous fire are two kinds of major casualties in Safety of Coal Mine Production.For Gas Disaster, gas monitor monitoring
System is the main means of monitoring and warning.The gas sensor of spectral absorption type is most important a kind of fiber gas sensor,
It makes use of absorption peak of the gas in silica fibre transmission window, measurement, can be with since gas absorbs the light intensity attenuation generated
Obtain the concentration of gas.
Gas detection with optical fiber based on laser spectrum tech has high-resolution, highly selective, multicomponent W and low function
The advantages that consumption, becomes the effective tool of industrial harmful gas detection, can effectively solve existing for field of coal mine safety gas detection
Problem provides reliable Data safeguard for the prediction of Coal Mine Disasters.
Fig. 1 is existing direct absorption detecting formula gas sensor schematic diagram.As shown in Figure 1, existing directly absorb inspection
The transmitting terminal of survey formula gas sensor is mainly by the semiconductor laser 100 with TEC refrigerator, precision TEC temperature-control circuit
200, signal modulation (sweep current) circuit 300 forms.Wherein the semiconductor laser 100 with TEC refrigerator has and is tested
The accurate corresponding central wavelength of gas, but with the variation of environment temperature, 100 central wavelength of semiconductor laser can be generated
The variation of 0.1nm/C, in order to guarantee gas concentration measuring accuracy, system requirements sufficient center wavelength accuracy degree due to 0.01nm, so
It must accurately be controlled using the operating temperature of 200 noise spectra of semiconductor lasers 100 of TEC temperature-control circuit.In order to realize pair
Test the modulation (generating the alternating signal changed with gas concentration) of signal, it is also necessary to which signal modulation circuit 300 swashs semiconductor
Light device 100 is modulated, for example carries out current scanning modulation.Laser is under the driving of modulated signal, the laser signal of transmitting
It is transmitted by certain distance optical fiber, reaches the passive source gas sensing probe (gas absorption cell) of installation with measure field, detection is existing
Field will cause to decay on the propagation path of light in gas sensing probe if there is detected gas to laser intensity,
Signal after decaying returns to receiving end by optical fiber.Receiving end is mainly by photodiode 400, low noise amplifier circuit 500, number
It is formed according to capture card 600, processor 700 (PC or embeded processor) etc..Photodiode is received by being tested gas
Laser signal after decaying is amplified to the signal level of rear class part of data acquisition needs, In by low noise amplifier circuit 500
Signal processing is carried out after the acquisition of data collecting card 600, in input processor 700 and is calculated and is obtained gas concentration value, and
And it is shown on interface, or the movement such as generation alarm.
As noted previously, as various gases are very sensitive to optical maser wavelength, once semiconductor laser wavelength drifts about,
Then entire fiber gas sensor will generate measuring accuracy and be deteriorated or the serious consequences such as entirely ineffective.With semiconductor laser
When the aging of device chip or external environment parameters vary widely, it is possible to the variation of laser wavelength can be caused.
Although existing sensor has reached stable laser wavelength by accurately controlling the temperature of semiconductor laser
Purpose, but principle or a kind of opened loop control, can not achieve on-line monitoring and the control of laser wavelength.However to laser
The measurement of device wavelength needs extremely complex technological means, and the mature measurement method based on grating etc. can not be passed in gas optical fiber
It is used in sensor.
Utility model content
In view of the deficiencies of the prior art, it is accurate to be intended to provide a kind of fiber gas sensor laser wavelength for the utility model
Whether monitoring device allows the more accurate wavelength for measuring laser of processor to shift, to guarantee optical fiber gas
The measuring accuracy of body sensor.
To achieve the goals above, the utility model adopts the following technical solution:
A kind of fiber gas sensor laser wavelength precision monitoring device, including the semiconductor laser with TEC refrigerator
Device, TEC temperature-control circuit, modulated signal producing circuit, power control circuit, photodiode one, amplification module, data are adopted
Collect module, processor and passive source gas sensor probe；The TEC temperature-control circuit, modulated signal producing circuit, power control
Circuit processed is all connected to the semiconductor laser；The photodiode one, amplification module, data acquisition module, processor
It is sequentially connected；It is characterized in that, further including having optical splitter, local sample gas gas chamber, photodiode two and amplifier, institute
The input terminal that semiconductor laser is connected to the optical splitter is stated, the output end all the way of the optical splitter is connected to the nothing
Source gas sensor probe, another output end are then connected to the optical input of the local sample gas gas chamber；The local
Light output mouth, photodiode two and the amplifier of sample gas gas chamber are sequentially connected, and the amplifier is connected to the data
Acquisition module, the TEC temperature-control circuit are connected to the processor；The local sample gas gas chamber is provided with tested
Gas sample.
Further, the amplification module includes low noise trans-impedance amplifier and ac signal amplifiers；The low noise
The DC signal output end of trans-impedance amplifier is directly connected in the data acquisition module, and AC signal output end is then connected to institute
Ac signal amplifiers are stated, the ac signal amplifiers are connected to the data acquisition module.
Further, the data acquisition module is multichannel converter.
Further, the local sample gas gas chamber is all-sealed structure, the another output end of the optical splitter
The optical input of the local sample gas gas chamber is connected to by optical fiber, the light output mouth of the local sample gas gas chamber is logical
It crosses optical fiber and is connected to the photodiode two；The junction of the optical input and light output mouth and optical fiber is sealing structure.
Further, the output end all the way of the optical splitter is connected to the passive source gas sensor by optical fiber and visits
Head.
The utility model has the beneficial effects that:
Local sample gas gas chamber of the utility model by setting equipped with tested gas sample, and will by optical splitter
The fraction of laser light that semiconductor laser issues is separated into local sample gas gas chamber, by passing after being tested the decaying of gas sample
Photodiode two is transported to, amplified be transmitted in processor is analyzed, and processor can be made accurately to measure and partly led
Whether the wavelength of body laser shifts, and can control the wavelength of TEC temperature-control circuit noise spectra of semiconductor lasers accordingly
It is adjusted, so that the wavelength of semiconductor laser is returned exactly to the correct wavelength value of test macro requirement again, to guarantee light
The measurement accuracy of fine gas sensor.
Detailed description of the invention
Fig. 1 is existing fiber gas sensor composition schematic diagram；
Fig. 2 is the fiber gas sensor composition schematic diagram of the utility model embodiment.
Specific embodiment
Below with reference to attached drawing, the utility model will be further described, it should be noted that the present embodiment is with this skill
Premised on art scheme, the detailed implementation method and specific operation process are given, but the protection scope of the utility model is not
It is limited to the present embodiment.
As shown in Fig. 2, a kind of fiber gas sensor laser wavelength precision monitoring device, including with TEC refrigerator
Semiconductor laser 1, TEC temperature-control circuit 2, modulated signal producing circuit 3, power control circuit 4, photodiode 1,
Amplification module, data acquisition module 7, processor 8 and passive source gas sensor probe 9；The TEC temperature-control circuit 2, modulation
Signal generating circuit 3, power control circuit 4 are all connected to the semiconductor laser 1；The photodiode 1, amplification mould
Block, data acquisition module 7, processor 8 are sequentially connected；
The fiber gas sensor laser wavelength precision monitoring device further includes having optical splitter 10, local sample gas
Body gas chamber 11, photodiode 2 12 and amplifier 13, the semiconductor laser 1 are connected to the input of the optical splitter 10
End, the output end all the way of the optical splitter 10 are connected to the passive source gas sensor probe 9, and another output end then connects
It is connected to the optical input of the local sample gas gas chamber 11；The light output mouth of the local sample gas gas chamber 11, photosensitive two
Pole pipe 2 12 and amplifier 13 are sequentially connected, and the amplifier 13 is connected to the data acquisition module 7, the TEC temperature control
Circuit 2 processed is connected to the processor 8；The local sample gas gas chamber 11 is provided with tested gas sample.
In the present embodiment, the amplification module includes low noise trans-impedance amplifier 14 and ac signal amplifiers 15；Institute
The DC signal output end for stating low noise trans-impedance amplifier 14 is directly connected in the data acquisition module 7, AC signal output
End is then connected to the ac signal amplifiers 15, and the ac signal amplifiers 15 are connected to the data acquisition module 7.
In the present embodiment, the data acquisition module 7 is multichannel converter.
In the present embodiment, the local sample gas gas chamber 11 is all-sealed structure, the optical splitter 10 it is another
Road output end is connected to the optical input of the local sample gas gas chamber 11, the local sample gas gas chamber by optical fiber
11 light output mouth is connected to the photodiode 2 12 by optical fiber；The company of the optical input and light output mouth and optical fiber
Meeting place is sealing structure.
In the present embodiment, the output end all the way of the optical splitter 10 is connected to the passive source gas by optical fiber and senses
Device probe 9.
When work, effect of the semiconductor laser in TEC temperature-control circuit, power control circuit and modulating signal circuit
Lower sending laser, the laser are divided into two-way by optical splitter, all the way by optical fiber be transferred to gas monitor scene without source gas
Body sensing probe, the light after being tested gas attenuation pass through photodiode one of the fiber pass-back to receiving end, photodiode
Once crossing low noise trans-impedance amplifier, the direct current signal of amplification is directly entered multichannel converter, and amplitude is still lesser
AC compounent is amplified again by ac signal amplifiers, into multichannel converter.The direct current of signal by AD conversion
All enter processor with alternating component and carry out signal analysis and calculating, obtain gas concentration value and shows result or provide alarm letter
Breath etc..
In the present embodiment, the another way laser separated from optical splitter is directly entered local sample after short section of optical fiber
This gas gas chamber.Equipped with the tested gas sample according to constant density ratio in local sample gas gas chamber.To guarantee local sample
The long-time stability of gas concentration in this gas gas chamber, the local sample gas gas chamber use all-sealed structure, prevent gas leakage and
Other gases such as external moisture enter.Laser into local sample gas gas chamber is passed through after the sample gas decaying of constant density
It crosses short section of optical fiber to enter after photodiode two is transformed into current signal, amplifies using amplifier, turn into multichannel AD
Parallel operation is converted into digital signal, is re-fed into processor analysis processing.Because local sample gas concentration is it is known that swash reference path
The decaying modulation effect of light is also determination, to the calibration value of reference sample optical path when processor can dispatch from the factory according to sensor
It is monitored, once laser wavelength generates offset, the pad value of reference path will change.If cooperating current scanning
Mode can also substantially judge direction and the numerical value of wavelength shift.After detecting laser wavelength drift, processor can be with
Laser wavelength is readjusted by adjusting TEC temperature-control circuit, wavelength is made again to return exactly to test macro requirement
Correct wavelength value.
For those skilled in the art, it can be provided various corresponding according to above technical solution and design
Change and modification, and all these change and modification, should be construed as being included in the utility model claims protection scope it
It is interior.
Claims (5)
1. a kind of fiber gas sensor laser wavelength precision monitoring device, including the semiconductor laser with TEC refrigerator,
TEC temperature-control circuit, modulated signal producing circuit, power control circuit, photodiode one, amplification module, data acquisition
Module, processor and passive source gas sensor probe；The TEC temperature-control circuit, modulated signal producing circuit, power control
Circuit is all connected to the semiconductor laser；The photodiode one, amplification module, data acquisition module, processor according to
Secondary connection；It is characterized in that, further include having optical splitter, local sample gas gas chamber, photodiode two and amplifier, it is described
Semiconductor laser is connected to the input terminal of the optical splitter, and the output end all the way of the optical splitter is connected to described passive
Gas sensor probe, another output end are then connected to the optical input of the local sample gas gas chamber；The local sample
Light output mouth, photodiode two and the amplifier of this gas gas chamber are sequentially connected, and the amplifier is connected to the data and adopts
Collect module, the TEC temperature-control circuit is connected to the processor；The local sample gas gas chamber is provided with tested gas
Sample.
2. fiber gas sensor laser wavelength precision monitoring device according to claim 1, which is characterized in that described
Amplification module includes low noise trans-impedance amplifier and ac signal amplifiers；The direct current signal of the low noise trans-impedance amplifier is defeated
Outlet is directly connected in the data acquisition module, and AC signal output end is then connected to the ac signal amplifiers, described
Ac signal amplifiers are connected to the data acquisition module.
3. fiber gas sensor laser wavelength precision monitoring device according to claim 1 or 2, which is characterized in that
The data acquisition module is multichannel converter.
4. fiber gas sensor laser wavelength precision monitoring device according to claim 1, which is characterized in that described
Local sample gas gas chamber is all-sealed structure, and the another output end of the optical splitter is connected to the local by optical fiber
The light output mouth of the optical input of sample gas gas chamber, the local sample gas gas chamber is connected to described photosensitive two by optical fiber
Pole pipe two；The junction of the optical input and light output mouth and optical fiber is sealing structure.
5. fiber gas sensor laser wavelength precision monitoring device according to claim 1, which is characterized in that described
The output end all the way of optical splitter is connected to the passive source gas sensor probe by optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822100566.8U CN209624385U (en) | 2018-12-13 | 2018-12-13 | A kind of fiber gas sensor laser wavelength precision monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822100566.8U CN209624385U (en) | 2018-12-13 | 2018-12-13 | A kind of fiber gas sensor laser wavelength precision monitoring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209624385U true CN209624385U (en) | 2019-11-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822100566.8U Active CN209624385U (en) | 2018-12-13 | 2018-12-13 | A kind of fiber gas sensor laser wavelength precision monitoring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209624385U (en) |
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2018
- 2018-12-13 CN CN201822100566.8U patent/CN209624385U/en active Active
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