CN1584551A - Gas concentration sensor by nanometer microporous structure optical-fibre - Google Patents
Gas concentration sensor by nanometer microporous structure optical-fibre Download PDFInfo
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- CN1584551A CN1584551A CN 200410037099 CN200410037099A CN1584551A CN 1584551 A CN1584551 A CN 1584551A CN 200410037099 CN200410037099 CN 200410037099 CN 200410037099 A CN200410037099 A CN 200410037099A CN 1584551 A CN1584551 A CN 1584551A
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- optical fiber
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- grin lens
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Abstract
A transducer having at least one luminous diode is featured as setting self-focusing lens on light path of the diode and having glass optical fibre and nanooptical fibre in front of the lens separately, connecting another ends of the two optical fibres to detector, setting light filtering plate in front of the detector and connecting output end of the detector in external to gas concentration monitoring circuit through differential amplifier.
Description
Technical field
The present invention relates to a kind of gas concentration sensor, especially a kind of gas concentration sensor that has nano micropore structure capable optical fiber.
Background technology
All gases (for example methane, H
2O, NH
3, CO, CO
2, H
2S etc.) detection of concentration has great significance to economic development and social progress, is example with gas (having another name called methane, biogas), and gas explosion is the main reason of China's coal-mine industrial accident, if the concentration of gas is 5.0%～16% in the air; Then promptly can blast having under the situation of naked light.In causing the reason of gas explosion, checkout equipment deficiency, poor performance, the detection means backwardness is one of its major reason.At present used sensor is based on that thermocatalysis detects and the interference of light detects two kinds of principles in the methane detector that uses, owing to its price height, volume is big, detection time is long, use is inconvenient, can't popularize use basically under mine.
The gas sensor industry has been classified as the industry of emphasis support development by country, existing many methane gas sensor spare and coal mine safety apparatus gas sensor manufacturing enterprises.
Summary of the invention
The present invention aims to provide a kind of the realization gas concentration is implemented monitoring at any time, its sensitivity and reliability height, life-span length, little power consumption, does not have the gas concentration sensor of the employing nano micropore structure capable optical fiber of poisoning.
The present invention is provided with at least 1 light emitting diode, the light path that light emitting diode sends is provided with GRIN Lens, before GRIN Lens, be respectively equipped with the optical fiber (to call nano optical fibers in the following text) of glass optical fiber and employing nano micropore structure capable, one road light is coupled into glass optical fiber through GRIN Lens, another Lu Guangjing GRIN Lens is coupled into nano optical fibers, glass optical fiber, the other end of nano optical fibers connects the detector (to call photodetector in the following text) of surveying light signal respectively, before the incident light window of photodetector, be provided with the light filter plate, the input end of the output termination differential amplifier of photodetector, the output terminal external gas bulk concentration observation circuit of differential amplifier.The optical fiber of said employing nano micropore structure capable is that a kind of inside is covered with nano level connection or partially communicating micropore, can transmit light, also can freely the come in and go out optical fiber of micropore of gas, and nanometer level microporous diameter is that tens nanometers are to the hundreds of nanometer.
The corresponding light of characteristic absorption wavelength of light emitting diode emission and monitored gas, enter nano optical fibers and ordinary optic fibre after the beam splitting respectively, then respectively by two photoelectric detectors receive through detected gas absorb with two-way light intensity concentration change and that be not subjected to the detected gas concentration affects.The voltage signal of two photoelectric detectors is admitted to differential amplifier and carries out linear process and power amplification to the survey gas concentration, and with this through the output of the voltage signal behind power amplifier.Owing to adopted and had nanoscale hole optical fiber and common glass optical fiber the light of beam splitting is carried out Photoelectric Detection and differential linearity processing, pass through power amplification again, the present invention compared with existing traditional gas concentration monitoring instrument have: volume is little, in light weight, sensitivity with the reliability height, the life-span is long, price is low, do not have poisoning, little power consumption, only the special light emitting diode of needs replacing and corresponding with it photoelectric detector just are easy to realization multiple gases is implemented monitoring and other advantages simultaneously.
Description of drawings
Fig. 1 is that the structure of the embodiment of the invention is formed synoptic diagram.
Embodiment
Following examples will the invention will be further described in conjunction with the accompanying drawings.
As shown in Figure 1, the present invention is provided with at least 1 light emitting diode 1, light emitting diode 1 connects GRIN Lens 2 and 3, on GRIN Lens 2 and 3, connect simple glass optical fiber 4 and a nano optical fibers 5 respectively, the other end of simple glass optical fiber 4 and nano optical fibers 5 connects the photodetector 7 and 8 of surveying light signal respectively, at simple glass optical fiber 4 and nano optical fibers 5 and photodetector 7, be provided with light filter plate 6 between before 8 the incident light window, the input end of photodetector 7 and 8 output termination differential amplifier 9, the output terminal external gas bulk concentration observation circuit 10 of differential amplifier 9.
Light emitting diode can be selected Japanese hamamatsu company product for use, and model is L8245, and its luminescence spectrum is to locate to be peak value about 1.65 μ m at wavelength.The light filter plate only can pass through detected gas characteristic absorption peak place wavelength, in order to improve monitoring accuracy, avoids external Electromagnetic Interference.It is the product of GL-W-18-025 with the dimension model that GRIN Lens is selected Xi'an for use.Simple glass fiber selection diameter is the glass optical fiber of 0.6mm.Filter plate is selected Wuhan Li Bang Optronics APS product for use.Photodetector is selected Japanese hamamatsu company product for use, and model is G5851-13, and its response curve peak value is about 1.7 μ m.Differential amplifier and concentration monitor circuit adopt commercially available finished product.
As required, if select at monitored gas light emitting diode, the photoelectric detector of unique characteristic absorption wavelength, can realize multiple gases (for example methane gas/gas etc.) is implemented monitoring simultaneously.
Claims (1)
1, a kind of gas concentration sensor that adopts nano micropore structure capable optical fiber, it is characterized in that being provided with at least 1 light emitting diode, the light path that light emitting diode sends is provided with GRIN Lens, before GRIN Lens, be respectively equipped with the optical fiber of glass optical fiber and employing nano micropore structure capable, one road light is coupled into glass optical fiber through GRIN Lens, another Lu Guangjing GRIN Lens is coupled into nano optical fibers, glass optical fiber, the other end of nano optical fibers connects the detector of surveying light signal respectively, before the incident light window of photodetector, be provided with the light filter plate, the input end of the output termination differential amplifier of photodetector, the output terminal external gas bulk concentration observation circuit of differential amplifier, said nano optical fibers is that a kind of inside is covered with nano level connection or partially communicating micropore, can transmit light, also can freely the come in and go out optical fiber of micropore of gas, nanometer level microporous diameter is that tens nanometers are to the hundreds of nanometer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410037099 CN1252462C (en) | 2004-06-02 | 2004-06-02 | Gas concentration sensor by nanometer microporous structure optical-fibre |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410037099 CN1252462C (en) | 2004-06-02 | 2004-06-02 | Gas concentration sensor by nanometer microporous structure optical-fibre |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1584551A true CN1584551A (en) | 2005-02-23 |
| CN1252462C CN1252462C (en) | 2006-04-19 |
Family
ID=34601486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410037099 Expired - Fee Related CN1252462C (en) | 2004-06-02 | 2004-06-02 | Gas concentration sensor by nanometer microporous structure optical-fibre |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1252462C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1900696B (en) * | 2006-07-26 | 2010-05-26 | 中北大学 | Hollow core photon crystal fiber-optic fiber gas sensor |
| CN103217405A (en) * | 2013-03-21 | 2013-07-24 | 浙江大学 | Microfluidic contrast optical path detection system |
| CN107121400A (en) * | 2017-06-16 | 2017-09-01 | 珠海任驰光电科技有限公司 | A kind of pseudo-differential wavelength modulation optical fiber concentration of methane gas detection means and method |
-
2004
- 2004-06-02 CN CN 200410037099 patent/CN1252462C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1900696B (en) * | 2006-07-26 | 2010-05-26 | 中北大学 | Hollow core photon crystal fiber-optic fiber gas sensor |
| CN103217405A (en) * | 2013-03-21 | 2013-07-24 | 浙江大学 | Microfluidic contrast optical path detection system |
| CN103217405B (en) * | 2013-03-21 | 2015-03-04 | 浙江大学 | Microfluidic contrast optical path detection system |
| CN107121400A (en) * | 2017-06-16 | 2017-09-01 | 珠海任驰光电科技有限公司 | A kind of pseudo-differential wavelength modulation optical fiber concentration of methane gas detection means and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1252462C (en) | 2006-04-19 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060419 |