CN203811533U - Multiplexing optical fiber gas sensor capable of measuring various gas compositions - Google Patents
Multiplexing optical fiber gas sensor capable of measuring various gas compositions Download PDFInfo
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- CN203811533U CN203811533U CN201420225462.9U CN201420225462U CN203811533U CN 203811533 U CN203811533 U CN 203811533U CN 201420225462 U CN201420225462 U CN 201420225462U CN 203811533 U CN203811533 U CN 203811533U
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Abstract
The utility model discloses a multiplexing optical fiber gas sensor capable of measuring various gas compositions. The sensor comprises a wide-spectrum light source, an output control module, a light amplifier, a gas chamber, a photoelectric detector and a signal processing module, wherein the output end of the wide-spectrum light source is connected with the input end of the control module; the output end of the control module is connected with the input end of the light amplifier; the output end of the light amplifier is connected to the input end of the gas chamber; the output end of the gas chamber is connected with the input end of the photoelectric detector; the output end of the photoelectric detector is connected with the input end of the signal processing module. The sensor disclosed by the utility model has the advantages that the wavelength is selected by adopting the output control module and the wavelength of the detection light source can be changed according to the need, so that various different gas concentrations can be measured; the using quantity of the photoelectric detector can be reduced through wavelength selection control, so that the cost is reduced; the intensity of characteristic spectral lines is amplified and increased through the light amplifier, so that the signal-to-noise ratio is improved, the tuning can be realized, the anti-jamming capability and the sensitivity of detection light are improved.
Description
Technical field
The utility model relates to technical field of image processing, the especially a kind of multiplexing type optical fiber gas sensor that can measure multiple gases composition.
Background technology
The detection principle of fiber gas sensor be according to light the physics parameter role to be measured in the situation that, the light intensity that parameter to be measured may cause, wavelength, frequency, the isoparametric variation of phase place, extract the information of measured parameter the optical parameter that may change from these.Its general type is characteristic or the additional sensitive element that utilizes optical fiber itself, the change modulates of measured signal is become to the variation of optical parameter.Therefore in Fibre Optical Sensor, according to optical fiber role, can be divided into functional Fibre-Optic Sensors and non-functional optic fiber sensor.Basic structure in the fiber gas sensor of non-functional is: using the light of light source transmitting as carrier wave, air chamber is as sensitive element, light intensity variation is added on light carrier as signal, optical fiber is as transmission medium, by photodetector, propose signal again, in conjunction with spectral, analyze the information such as concentration of gas to be measured.The deficiency that non-functional fiber gas sensor exists some to bring due to its architectural feature at present, be mainly manifested in: light source light spectrum scope is large, a little less than signal, under noise circumstance, be difficult to extract signal, measurement target is single, and a sensor can only be measured a kind of relevant physical parameter of object gas.The defect existing in order to solve fiber optic sensor system, prior art has adopted some new structure and methods, but all there is following shortcoming in these prior aries:
1) interference of the non-characteristic spectral line of employing narrow linewidth light source (as: Distributed Feedback Laser) realize target gas to signal.But because the emission wavelength of DFB has temperature sensitivity, this sensor stability is controlled difficulty;
2) adopt F-P passive cavity as filter structure, realize narrow linewidth carrier wave.But be Gauss by LED spectrum line style, when characteristic spectral line is positioned at LED spectral edges, intensity is extremely faint, is difficult to extract signal under noise conditions, this makes near the spectrum that can only use LED centre wavelength, and this structure generally can only be measured a kind of object gas.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of multiplexing type optical fiber gas sensor that can measure multiple gases composition, it can realize multiple gases measuring concentration of components, and it is adjustable to realize output wavelength, make whole system good stability, to overcome the deficiencies in the prior art.
The utility model is achieved in that the multiplexing type optical fiber gas sensor that can measure multiple gases composition, comprise wide spectrum light source, output control module, image intensifer, air chamber, photodetector and signal processing module, the output terminal of wide spectrum light source is connected with the input end of control module, the input end that the output terminal of control module is connected with image intensifer connects, the output terminal of image intensifer is connected on air chamber input end, the output terminal of air chamber is connected with photodetector input end, and the output terminal of photodetector is connected with signal processing module input end; The composition of output control module comprises Wave decomposing multiplexer, switch arrays and wavelength division multiplexer, the input end of Wave decomposing multiplexer is connected with the output terminal of wide spectrum light source, Wave decomposing multiplexer output terminal is connected with the input end of switch arrays, the output terminal of switch arrays is connected with the input end of wavelength division multiplexer, and the input end that the output terminal of wavelength division multiplexer is connected with image intensifer connects.
Described light source is light emitting diode (LED), and the maximum overall with of emission spectrum half (FWHM) is more than 50nm.
Described Wave decomposing multiplexer and wavelength division multiplexer are fused tapered, dielectric model, Waveguide array type or grating type structure; Switch arrays are that two identical single-row light-operated switches of above structure form, or one the two above switches set of row; And switch arrays are magnetic switch, light-operated switch or mechanical switch.
Described air chamber can be GRIN Lens structure, can also be White's cavity configuration.
Principle of work: light source is LED, radiation wide spectrum optical, by optical fiber input wavelength control module, according to object gas, by wavelength control module, select the light of specific wavelength to export, output light becomes narrow linewidth light source, by it after image intensifer amplifies, be transfused to air chamber, when surveying light by after air chamber, the position of the corresponding determinand characteristic spectral line in spectrum absorbs, show as light intensity variation has occurred, this light intensity changes process photodetector and is converted into electric signal again through A/D conversion, the signal analysis process of the standards such as frequency analysis, finally obtain the concentration of gas to be measured.
Compared with prior art, the utility model is selected wavelength by employing output control module, and can change as required the wavelength of probe source, can measure multiple different gas concentration, use wavelength selection control can also reduce the usage quantity of photodetector, thereby reduce costs; By image intensifer, the intensity of characteristic spectral line is had and amplify strengthened again, thereby improve signal to noise ratio (S/N ratio), can realize tuningly, improved antijamming capability and the sensitivity of surveying light.The utility model is simple in structure, can realize the multiplexing function of measuring multiple gases composition, and result of use is good.
Accompanying drawing explanation
Accompanying drawing 1 is principle of work structural representation of the present utility model;
Accompanying drawing 2 is the structural representation of embodiment 1 of the present utility model.
Accompanying drawing 3 is the structural representation of embodiment 2 of the present utility model.
Embodiment
Embodiment 1 of the present utility model: can measure multiple gases composition multiplexing type optical fiber gas sensor structure as shown in Figure 2, the output terminal of wide spectrum light source 1 is connected with the input end of control module 2, output control module 2 is by Wave decomposing multiplexer 7, switch arrays 8, wavelength division multiplexer 9 forms with the optical fiber for being connected, switch arrays consist of n single-row switch, the input end of demodulation multiplexer 7 is input ends of output control module 2, demodulation multiplexer 7 has n output terminal, by optical fiber, be connected with the input end of n switch respectively, the output terminal of n switch is connected with n input end of wavelength division multiplexer 9 respectively, the light of controlling a certain wavelength by switch enters wavelength division multiplexer 9, the output terminal of wavelength division multiplexer 9 is connected with the input end of image intensifer 3, light signal is exaggerated, the output terminal of image intensifer 3 is connected on air chamber 4 input ends, air chamber 4 is by two sections of optical fiber 10, 16, a pair of GRIN Lens 12, 15, and one have two pores 13, 14 glass cylinder cylinder 11 forms, optical fiber 10 is connected with GRIN Lens 12 as air chamber 4 input ends, node is positioned at the right-hand focus 12F of GRIN Lens 12, the light of scioptics 12 becomes one group of directional light, pass through in air chamber process and partially absorbed by gas, directional light converges at focus 15F by GRIN Lens 15 after arriving left end, goes forward side by side into optical fiber 16 as air chamber 4 output terminals, the output terminal of air chamber 4 is connected with the input end of photodetector 5, and the output terminal of photodetector 5 is connected with signal processing module 6 input ends, when surveying light by after air chamber, the position of the corresponding determinand characteristic spectral line in spectrum absorbs, show as light intensity variation has occurred, this light intensity changes process photodetector 5 and is converted into electric signal again through the signal analysis process of the standards such as A/D conversion, frequency analysis, finally obtains the concentration of gas to be measured, switch arrays 8 can change the wavelength of probe source, and then can measure multiple different gas concentration.
Embodiment 2 of the present utility model: can measure multiple gases composition multiplexing type optical fiber gas sensor structure as shown in Figure 1, comprise wide spectrum light source 1, output control module 2, image intensifer 3, air chamber 4, photodetector 5 and signal processing module 6, the output terminal of wide spectrum light source 1 is connected with the input end of control module 2, the input end that the output terminal of control module 2 is connected with image intensifer 3 connects, output control module 2 is by Wave decomposing multiplexer 7, switch arrays 8, wavelength division multiplexer 9 forms with the optical fiber for being connected, switch arrays consist of n single-row switch, the input end of demodulation multiplexer 7 is input ends of output control module 2, demodulation multiplexer 7 has n output terminal, by optical fiber, be connected with the input end of n switch respectively, the output terminal of n switch is connected with n input end of wavelength division multiplexer 9 respectively, the light of controlling a certain wavelength by switch enters wavelength division multiplexer 9, the output terminal of wavelength division multiplexer 9 is connected with the input end of image intensifer 3, light signal is exaggerated, the output terminal of image intensifer 3 is connected on air chamber 4 input ends, air chamber 4 is by two sections of optical fiber 17, 18, two concave mirrors 22, 23, one has two pores 20, 21 glass cylinder cylinder 19 forms, optical fiber 17 one end are as the input end of air chamber, the other end is connected with the input end of concave mirror mirror collimating apparatus 24, the light of output terminal repeatedly comes and goes and finally enters collimating apparatus 25 through air chamber under the reflex at concave mirror 22,23, the other end of collimating apparatus 25 is connected the output as air chamber 4 with optical fiber 18, the input end that air chamber 4 output terminals connect photodetector 5 connects, and the output terminal of photodetector 5 is connected with signal processing module 6 input ends, Wave decomposing multiplexer 7 and wavelength division multiplexer 9 are waveguide array type (solution) WDM structure, and switch arrays 8 are the magnetic switch group 8b1 of n row ... 8bn.
In above-described embodiment, wide spectrum light source 1 is light emitting diode light source, and more than emergent light spectrum width 50nm, radiation spectrum meets Gaussian distribution or Lorentz distributes, wide spectrum light source 1 transmitting wide spectrum optical, Wave decomposing multiplexer 7 channel spacing Δ λ, can according to wavelength interval, be that Δ λ is divided into the narrow spectrum light in n road by wide spectrum light source, according to the characteristic spectral line of object gas, the switch of switch arrays 8 correspondences is set to opening state, other switch is set to off-state, control this road light by wavelength division multiplexer 9, by image intensifer 3, amplified and obtain the high-intensity desirable probe source of narrow spectrum width again, when surveying light by after air chamber, the position of the corresponding determinand characteristic spectral line in spectrum absorbs, show as light intensity variation has occurred, this light intensity changes process photodetector 5 and is converted into electric signal again through A/D conversion, the signal analysis process of the standards such as frequency analysis, finally obtain the concentration of gas to be measured, switch arrays 8 can change the wavelength of probe source, and then can measure multiple different gas concentration.
Wave decomposing multiplexer and wavelength division multiplexer can be selected fused tapered or dielectric model or Waveguide array type or grating type structure as required; Switch arrays can form with the identical single-row light-operated switch of structure, also can be comprised of multiple row switch; Switch arrays can be magnetic switch, light-operated switch or mechanical switch.
Wide spectrum light source 1, image intensifer 3, air chamber 4, photodetector 5 and signal processing module 6 all can be purchased from the conventional commercially available prod that can realize above-mentioned functions.
Claims (5)
1. the multiplexing type optical fiber gas sensor that can measure multiple gases composition, comprise wide spectrum light source (1), output control module (2), image intensifer (3), air chamber (4), photodetector (5) and signal processing module (6), it is characterized in that: the output terminal of wide spectrum light source (1) is connected with the input end of control module (2), the input end that the output terminal of control module (2) is connected with image intensifer (3) connects, the output terminal of image intensifer (3) is connected on air chamber (4) input end, the output terminal of air chamber (4) is connected with the input end of photodetector (5), the output terminal of photodetector (5) is connected with signal processing module (6) input end, the composition of output control module (2) comprises Wave decomposing multiplexer (7), switch arrays (8) and wavelength division multiplexer (9), the input end of Wave decomposing multiplexer (7) is connected with the output terminal of wide spectrum light source (1), Wave decomposing multiplexer (7) output terminal is connected with the input end of switch arrays (8), the output terminal of switch arrays (8) is connected with the input end of wavelength division multiplexer (9), and the input end that the output terminal of wavelength division multiplexer (9) is connected with image intensifer (3) connects.
2. the multiplexing type optical fiber gas sensor that can measure multiple gases composition according to claim 1, is characterized in that: wide spectrum light source (1) is light emitting diode, and the maximum overall with of spectrum half is more than 50nm.
3. the multiplexing type optical fiber gas sensor that can measure multiple gases composition according to claim 1, is characterized in that: described Wave decomposing multiplexer (7) and wavelength division multiplexer (9) are fused tapered, dielectric model, Waveguide array type or grating type structure; Switch arrays (8) are that two identical single-row light-operated switches of above structure form, or one the two above switches set of row; And switch arrays (8) are magnetic switch, light-operated switch or mechanical switch.
4. the multiplexing type optical fiber gas sensor that can measure multiple gases composition according to claim 1, is characterized in that: image intensifer (3) is Erbium-Doped Fiber Amplifier (EDFA) or semiconductor optical amplifier.
5. the multiplexing type optical fiber gas sensor that can measure multiple gases composition according to claim 1, is characterized in that: air chamber (4) is GRIN Lens structure or White's cavity configuration.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103954572A (en) * | 2014-05-05 | 2014-07-30 | 贵州大学 | Multiplexed optical fiber gas sensor capable of measuring various gas components |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103954572A (en) * | 2014-05-05 | 2014-07-30 | 贵州大学 | Multiplexed optical fiber gas sensor capable of measuring various gas components |
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