CN205537775U - Colliery gas density and temperature measuring system based on optical fiber sensing - Google Patents
Colliery gas density and temperature measuring system based on optical fiber sensing Download PDFInfo
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- CN205537775U CN205537775U CN201620371218.2U CN201620371218U CN205537775U CN 205537775 U CN205537775 U CN 205537775U CN 201620371218 U CN201620371218 U CN 201620371218U CN 205537775 U CN205537775 U CN 205537775U
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- temperature
- optical fiber
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- absorption chamber
- gas
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- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The utility model provides a colliery gas density and temperature measuring system based on optical fiber sensing selects the DFB laser instrument as the light source, adjusts the methane gas in a certain absorption peak department of near -infrared with laser wavelength, use mechanical type photoswitch, and the light signal that sends the laser instrument divide into the multi beam. The gaseous absorption chamber of partly fiber connection for measure the gas gas strength, the temperature monitoring optical cable is connected to another part for temperature under the measuring well has realized effectively combining the detecting system of two parameters of temperature and gas density. The utility model discloses well gaseous absorption chamber and armor temperature measurement optical fiber place in passageway in the pit, and all the other equipment all can be placed in aboveground monitor, and all detection information pass through optical fiber transmission to the aboveground monitor in, and the staff can be at aboveground size, distribution and the change rule etc. That know in the pit everywhere gas density and temperature in time to can make the exact judges and makes a strategic decision.
Description
Technical field
This utility model relates to technical field of optical fiber sensing, particularly relates to a kind of colliery based on Fibre Optical Sensor
Gas density and system for detecting temperature.
Background technology
Fibre Optical Sensor is a kind of novel sensor that 20 century 70s develop rapidly mid-term.It is with light
Be detected as basis, is measurable optical signal detected change transitions, such as intensity, phase place, polarization
State, frequency, the change of wavelength.Optical fiber has a lot of excellent performance, such as electromagnetism interference and atom
The performance of radiation, footpath is thin, matter is soft, lightweight mechanical performance；Insulation, inductionless electric property；
Water-fast, high temperature resistant, corrosion resistant chemical property etc., it can in the place (such as high-temperature region) that people does not reaches,
Or the area (such as radioprotective district) being pernicious to people.
The simple optical fiber of Fibre Optical Sensor is typically only capable to detect a certain physical quantity at present, but should in many
With in field, need to detect multiple physical quantity.Such as in terms of coal mine safety monitoring, for preventing coal mine
Lower generation gas explosion accident, needs to detect gas density and the Temperature Distribution feelings of down-hole various location
Condition.Although safety of coal mines detection technique develops constantly, but gas explosion accident is the most in rapid succession
Occur, serious harm miner's life and national wealth safety, become and realize the huge of Safety of Coal Mine Production
Obstacle.
Summary of the invention
This utility model to solve above technical problem, it is provided that a kind of coal mine gas based on Fibre Optical Sensor is dense
Degree and system for detecting temperature.
For solving above-mentioned technical problem, the technical solution adopted in the utility model is: based on Fibre Optical Sensor
Coal mine gas concentration and system for detecting temperature, turn including Distributed Feedback Laser, photoswitch, bonder, photoelectricity
Change circuit, calculate processing center, gas absorption chamber, temperature monitoring optical cable, optical time domain reflection processing unit
With spectrum separative element, described Distributed Feedback Laser is connected with described photoswitch, and a road of described photoswitch is defeated
Going out to connect described gas absorption chamber, remaining road output of described photoswitch is laggard by the modulation of described bonder
Entering described temperature monitoring optical cable, the outfan of described gas absorption chamber and described temperature monitoring optical cable is all connected with
Described photoelectric switching circuit, the outfan of described photoelectric switching circuit connects described calculating processing center, institute
Stating the outfan described Distributed Feedback Laser of connection calculating processing center, described spectrum separative element is to described temperature
Degree monitoring optical cable decomposes, and described spectrum separative element passes through described optical time domain reflection processing unit and institute
State calculating processing center to be connected.
Described temperature monitoring optical cable is armored temperature measuring optical fiber.
Described GAS ABSORPTION chamber interior is respectively arranged at two ends with a gradual index lens, described GAS ABSORPTION
Outdoor is respectively arranged at two ends with a FC fibre-optical splice.
Described calculating processing center is industrial computer.
This utility model has the advantage that with good effect: coal mine gas concentration based on Fibre Optical Sensor and
System for detecting temperature, selects Distributed Feedback Laser as light source, optical maser wavelength is adjusted to methane gas closely
At infrared a certain absworption peak, using mechanical optical switch, the optical signal sent by laser instrument is divided into multi beam.
A part of optical fiber connects gas absorption chamber, in order to measure methane gas concentration；Another part connects temperature prison
Light-metering cable, is used for measuring downhole temperature, it is achieved that by temperature and the detecting system of two parameters of gas density
Effectively combine.In this utility model, gas absorption chamber and armored temperature measuring optical fiber are placed in the passage of down-hole, its
Remaining equipment all can be placed in aboveground Control Room, and all of detection information passes through fiber-optic transfer to aboveground monitoring
Indoor, staff can aboveground understand in time down-hole gas density everywhere and the size of temperature, point
Cloth and Changing Pattern etc., so as to make correct judgement and decision-making.
Accompanying drawing explanation
Fig. 1 is coal mine gas concentration based on Fibre Optical Sensor and the connection diagram of system for detecting temperature.
Detailed description of the invention
Below in conjunction with the accompanying drawings specific embodiment of the utility model is elaborated.
As it is shown in figure 1, coal mine gas concentration based on Fibre Optical Sensor and system for detecting temperature, including DFB
Laser instrument, photoswitch, bonder, photoelectric switching circuit, calculating processing center, gas absorption chamber, temperature
Degree monitoring optical cable, optical time domain reflection processing unit and spectrum separative element, described Distributed Feedback Laser is with described
Photoswitch is connected, and a road output of described photoswitch connects described gas absorption chamber, its of described photoswitch
Yu Lu output enters described temperature monitoring optical cable after being modulated by described bonder, described gas absorption chamber and
The outfan of described temperature monitoring optical cable is all connected with described photoelectric switching circuit, described photoelectric switching circuit
Outfan connects described calculating processing center, and the outfan of described calculating processing center connects described DFB and swashs
Light device, described temperature monitoring optical cable is decomposed by described spectrum separative element, described spectrum separative element
It is connected with described calculating processing center by described optical time domain reflection processing unit.
Described temperature monitoring optical cable is armored temperature measuring optical fiber.
Described GAS ABSORPTION chamber interior is respectively arranged at two ends with a gradual index lens, described GAS ABSORPTION
Outdoor is respectively arranged at two ends with a FC fibre-optical splice.
Described calculating processing center is industrial computer.
Coal mine gas concentration based on Fibre Optical Sensor and the preferred forms of system for detecting temperature, gas is inhaled
Receiving room and armored temperature measuring optical fiber is placed in the passage of down-hole, remaining equipment all can be placed in aboveground Control Room
In.Staff just can understand down-hole gas density everywhere and temperature is divided in time at aboveground Control Room
Cloth, convenient formulation safety in production strategy.
The main component of methane gas is methane, and the light that wavelength is 1651nm and 1653.7nm is all had by it
Stronger absorption.This utility model uses Distributed Feedback Laser.Calculate processing center to be responsible for regulating laser instrument
Drive electric current and temperature.By drive circuit and the temperature of regulation laser instrument, its wavelength can be adjusted to
1653.7nm place.In this utility model, calculating processing center is an industrial computer.Photoelectric switching circuit
Including the photodetector being sequentially connected with, lock-in amplifier and data collecting card, use PIN photoelectricity two pole
Pipe is as photodetector, for including the photosignal of gas density information, uses lock-in amplifier
Obtain one rd harmonic signal and second harmonic signal, by data collecting card, two harmonic signals are sent into meter
Calculate processing center.Calculate the ratio that processing center calculates the amplitude of two harmonic signals, obtain gas density letter
Breath.
When laser pulse transmits in a fiber, laser and optical fiber interaction of molecules, three kinds of scatterings can be produced
Light: Rayleigh scattering, Raman scattering and Brillouin scattering, wherein Raman scattering is the most temperature sensitive, therefore
It is best suitable for for measuring temperature.Laser is injected in armored temperature measuring optical fiber after being modulated by bonder.Raman dissipates
Penetrate the composition dorsad carrying temperature information in light along backtracking, by two differences in spectrum separative element
The optical filter of centre wavelength, isolates stokes light and anti-Stokes light, converts through photodetector
For sending into data acquisition and procession unit after the signal of telecommunication.The intensity of Stokes ratio phase weak with temperature
Close；And the intensity of anti-Stokes scattering light and temperature strong correlation.By two-beam signal is processed
The temperature distribution curve along optical fiber is drawn with comparing calculation.Optical time domain reflection processing unit is by calculating light wave
Transmission speed and the echo time, it is achieved the location to all temperature spots.Then passed by RS232 interface
It is defeated by calculating processing center.
Above embodiment of the present utility model is described in detail, but described content has been only this practicality newly
The preferred embodiment of type, it is impossible to be considered the practical range for limiting the present invention.All according to this utility model
Equalization change and the improvement etc. that scope is made, within all should still belonging to this patent covering scope.
Claims (4)
1. coal mine gas concentration based on Fibre Optical Sensor and system for detecting temperature, it is characterised in that: include
Distributed Feedback Laser, photoswitch, bonder, photoelectric switching circuit, calculating processing center, gas absorption chamber,
Temperature monitoring optical cable, optical time domain reflection processing unit and spectrum separative element, described Distributed Feedback Laser and institute
Stating photoswitch to be connected, a road output of described photoswitch connects described gas absorption chamber, described photoswitch
The output of remaining road enters described temperature monitoring optical cable, described gas absorption chamber after being modulated by described bonder
It is all connected with described photoelectric switching circuit, described photoelectric switching circuit with the outfan of described temperature monitoring optical cable
Outfan connect described calculating processing center, the outfan of described calculating processing center connects described DFB
Laser instrument, described temperature monitoring optical cable is decomposed by described spectrum separative element, and described spectrum separates single
Unit is connected with described calculating processing center by described optical time domain reflection processing unit.
Coal mine gas concentration based on Fibre Optical Sensor the most according to claim 1 and temperature detection system
System, it is characterised in that: described temperature monitoring optical cable is armored temperature measuring optical fiber.
Coal mine gas concentration based on Fibre Optical Sensor the most according to claim 1 and temperature detection system
System, it is characterised in that: described GAS ABSORPTION chamber interior is respectively arranged at two ends with a gradual index lens,
Described GAS ABSORPTION outdoor is respectively arranged at two ends with a FC fibre-optical splice.
Coal mine gas concentration based on Fibre Optical Sensor the most according to claim 1 and temperature detection system
System, it is characterised in that: described calculating processing center is industrial computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620371218.2U CN205537775U (en) | 2016-04-27 | 2016-04-27 | Colliery gas density and temperature measuring system based on optical fiber sensing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620371218.2U CN205537775U (en) | 2016-04-27 | 2016-04-27 | Colliery gas density and temperature measuring system based on optical fiber sensing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205537775U true CN205537775U (en) | 2016-08-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620371218.2U Expired - Fee Related CN205537775U (en) | 2016-04-27 | 2016-04-27 | Colliery gas density and temperature measuring system based on optical fiber sensing |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106290099A (en) * | 2016-11-14 | 2017-01-04 | 上海腾盛智能安全科技股份有限公司 | A kind of smoke prewarning device based on SVM |
| CN110470630A (en) * | 2018-05-11 | 2019-11-19 | 西安电子科技大学 | A kind of distribution type fiber-optic gas sensor based on difference modes |
| CN112362597A (en) * | 2020-11-16 | 2021-02-12 | 安徽中科瀚海光电技术发展有限公司 | Multi-path laser gas monitoring system and monitoring method |
-
2016
- 2016-04-27 CN CN201620371218.2U patent/CN205537775U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106290099A (en) * | 2016-11-14 | 2017-01-04 | 上海腾盛智能安全科技股份有限公司 | A kind of smoke prewarning device based on SVM |
| CN110470630A (en) * | 2018-05-11 | 2019-11-19 | 西安电子科技大学 | A kind of distribution type fiber-optic gas sensor based on difference modes |
| CN112362597A (en) * | 2020-11-16 | 2021-02-12 | 安徽中科瀚海光电技术发展有限公司 | Multi-path laser gas monitoring system and monitoring method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160831 Termination date: 20170427 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |