CN207883078U - A kind of city integrated piping lane linear optical fiber temperature-sensing fire detecting system - Google Patents
A kind of city integrated piping lane linear optical fiber temperature-sensing fire detecting system Download PDFInfo
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- CN207883078U CN207883078U CN201721598005.4U CN201721598005U CN207883078U CN 207883078 U CN207883078 U CN 207883078U CN 201721598005 U CN201721598005 U CN 201721598005U CN 207883078 U CN207883078 U CN 207883078U
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- China
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- optical fiber
- sensing
- piping lane
- detecting system
- linear optical
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- Measuring Temperature Or Quantity Of Heat (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The utility model discloses a kind of city integrated piping lane linear optical fiber temperature-sensing fire detecting systems, are based on optical fiber Low coherence technology, introduce phase demodulating mechanism, to realize the high sensitivity of linear optical fiber distributed sensing and the detection function of fast-response speed.Multiple sensor is provided in sensing interferometer, and it is demodulated respectively using the same demodulated interferential instrument, finally by data acquisition and processing (DAP), the information of reduction sensing parameter, once temperature detected by optical fiber system, which detects a certain environment temperature in pipe gallery, reaches setting value, alarm is sent out immediately, is effectively realized that the temperature multiplexing of pipe gallery environment measures, is realized high-precision quasi-distributed online sensing function.
Description
Technical field
The utility model is related to fire alarming and controlling technical fields, and in particular to a kind of for the linear of city integrated piping lane
Temperature detected by optical fiber fire detecting system.
Background technology
In recent years, the underground engineerings such as pipe gallery and subway, Underground Urban Complex are gradually uniformly included in Urban Underground by China
Space planning, form commonization, synthesization development, the fire protection requirement of pipe gallery is gradually increased.Applied to pipe gallery
Fire alarm system be mainly linear optical fiber heat detection, have the distribution type fiber-optic based on Raman scattering and optical time domain reflectometer
Sensor, has many advantages, such as anti-electromagnetic interference capability strong, high sensitivity, at low cost, but for adapt to pipe gallery humid environment,
The features such as pipeline is complicated, fire protection requirement is high, need to further improve the performance of linear optical fiber temperature-sensing fire detecting system.
Invention content
The utility model is based on optical fiber Low coherence technology, introduces phase demodulating mechanism, to realize that linear optical fiber distribution passes
The high sensitivity of sense and the detection function of fast-response speed.
This system is provided with multiple sensor in sensing interferometer, and is carried out respectively using the same demodulated interferential instrument
Demodulation, finally by data acquisition and processing (DAP), the information of reduction sensing parameter, once temperature detected by optical fiber system detects environment temperature
Reach setting value, that is, send out alarm, effectively realizes that the temperature multiplexing of pipe gallery environment measures, realize high-precision quasi-distributed
Online sensing function.
The utility model provides a kind of linear optical fiber temperature-sensing fire detecting system for city integrated piping lane：
The low-coherent light sent out from ASE wideband light sources by 1 × N multiple beam optical fiber splitters C1 enter sensing interferometer,
The interference data of demodulated interferential instrument, acquisition carries out signal acquisition, number by photoelectric detector PD through digital signal processor DSP
According to operation, host computer is reached.
ASE wideband light sources provide C+L wave bands (1526nm~1603nm).Preferably, optoisolator is terminated in light source output,
For reflected light to be isolated, to realize that light source unidirectionally exports.
After light source enters sensing interferometer, a point 3 road light transmit wherein：Reference arm, temperature sensing arm, backup arms.Sensing
There are different optical path differences between arm and reference arm, and more than the coherence length of light source.
Demodulated interferential instrument, including Polarization Controller PC and electronic adjustable optic fibre delay line OTDL, for demodulating sensing interference
The roads Yi Zhongge transducing signal.By the scanning of OTDL, pickup arm is made to be compensated one by one with the pre-set optical path difference of reference arm
To obtain interference fringe.Preferably, the scanning range of OTDL is 0Ps~330Ps, and Polarization Controller is tricyclic, wavelength model
Enclose 780nm~1625nm, input, out splice going splice FC/PC.
Digital signal processor DSP completes signal acquisition, data processing, data transmission, D/A conversion functions, and signal is by ADC
Module acquires, and is converted into electric signal by optical signal, and be sent to host computer after DSP data processings.Meanwhile the digital I/O of DSP
The sawtooth voltage that interface triggering generates drives sensing interferometer.Preferably, D/A modules are extended out to the digital interface of DSP, be tested
Amount is converted to voltage value.
Preferably, optical fiber splitter is 1 × 3 optical branching device, and light beam division is realized using the method for slab guide；Optical fiber closes
Beam device passes through single mode optical fiber and 3DB coupler phase weldings.
Description of the drawings
Fig. 1 the utility model Fibre Optical Sensor demodulating systems
Fig. 2 digital signal processor DSPs form
Fig. 3 demodulated interferential instrument forms
Specific implementation mode
The low-coherent light sent out from ASE wideband light sources, spectral bandwidth 1526nm~1603nm, light source output termination are optically isolated
Device, isolation influence system performance since back reflected laser caused by junction etc. enters light source, to play protection light source
Effect.
Low-coherent light enters sensing interferometer by optical fiber splitter C1, and a point 3 road light transmit wherein：Reference arm, temperature
Pickup arm, backup arms.Demodulated interferential instrument includes Polarization Controller PC and electronic adjustable optic fibre delay line OTDL, Polarization Controller PC
It adjusts by the random drift of the polarization state of the light caused by the variation of optical fiber local environment and the bending of its own, so as to get
Interference signal possess preferable visibility；Electronic fibre delay line adjusts transducing signal, and 8 μm/s of sweep speed makes sensing
The pre-set light path of arm, reference arm is compensated one by one, the interference fringe of acquisition.Interference data by photoelectric detector PD, by
ADC module acquires signal, and sample rate 0.5MHz, optical signal is converted into analog electric signal, through dsp chip data processing, according to
Calibration is converted to measured, and host computer is reached by serial ports RS232.By being configured at digital I/O mouthfuls of DSP, sent out to sawtooth wave
Raw device provides the voltage pulse of 3.3V, starts saw-toothed wave generator.D/A modules are extended out to the digital interface of DSP, are turned being measured
It is changed to corresponding voltage value, is directly shown in display end by the form of digital watch.Host computer judges to be monitored environment temperature
Whether value reaches alarm setting value, if reaching, i.e., starts alarm and fire extinguishing linkage immediately.
The working principle and beneficial effect of the utility model is as follows：
Based on optical fiber Low coherence technology, different modulated signals is transmitted respectively using multi-channel optical fibre, then in signal receiving end
The reduction that modulated signal is realized using corresponding demodulation principle, realizes quasi-distributed parameter measurement.Effectively improve pipe gallery
The sensitivity of linear temperature sensing optical fiber detection, accuracy, provide safeguard to the work of pipe gallery fire alarm.
The above is only the preferred embodiment of the utility model, and the scope of protection of the utility model is not limited merely to
Above-described embodiment, technical solution belonging to the idea of the present invention belong to the scope of protection of the utility model.It should refer to
Go out, for those skilled in the art, it is without departing from the principle of the utility model it is several improvement and
Retouching, these improvements and modifications also should be regarded as the scope of protection of the utility model.
Claims (8)
1. a kind of city integrated piping lane linear optical fiber temperature-sensing fire detecting system, including ASE wideband light sources, multiple beam fiber optic splitter
Device C1, sensing interferometer, demodulated interferential instrument, photoelectric detector PD and digital signal processor DSP, it is characterised in that：The solution
Cadre enrolled among workers's interferometer includes that optical-fiber bundling device C2, Polarization Controller PC, electronic adjustable optic fibre delay line OTDL, ASE wideband light source are sent out
Low-coherent light sensing interferometer is entered by multiple beam optical fiber splitter C1.
2. city integrated piping lane linear optical fiber temperature-sensing fire detecting system according to claim 1, it is characterised in that：It is described
Polarization Controller PC is tricyclic, wave-length coverage 780nm~1625nm, input, out splice going splice FC/PC.
3. city integrated piping lane linear optical fiber temperature-sensing fire detecting system according to claim 1, it is characterised in that：It is described
The scanning range of electronic adjustable optic fibre delay line OTDL is 0Ps~330Ps.
4. city integrated piping lane linear optical fiber temperature-sensing fire detecting system according to claim 1, it is characterised in that：It is described
Digital signal processor DSP includes number I/O interfaces, A/D conversion modules, signal acquisition module.
5. city integrated piping lane linear optical fiber temperature-sensing fire detecting system according to claim 4, it is characterised in that：It is described
Signal acquisition module is ADC module.
6. city integrated piping lane linear optical fiber temperature-sensing fire detecting system according to claim 5, it is characterised in that：It is described
ADC module sample rate 0.5MHz.
7. city integrated piping lane linear optical fiber temperature-sensing fire detecting system according to claim 1, it is characterised in that：It is described
Multiple beam optical fiber splitter C1 is 1 × 3 optical branching device, and light beam division is realized using the method for slab guide.
8. according to any city integrated piping lane linear optical fiber temperature-sensing fire detecting system of claim 1~6, feature exists
In：The optical-fiber bundling device C2 passes through single mode optical fiber and three-dB coupler phase welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721598005.4U CN207883078U (en) | 2017-11-24 | 2017-11-24 | A kind of city integrated piping lane linear optical fiber temperature-sensing fire detecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721598005.4U CN207883078U (en) | 2017-11-24 | 2017-11-24 | A kind of city integrated piping lane linear optical fiber temperature-sensing fire detecting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207883078U true CN207883078U (en) | 2018-09-18 |
Family
ID=63501108
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721598005.4U Expired - Fee Related CN207883078U (en) | 2017-11-24 | 2017-11-24 | A kind of city integrated piping lane linear optical fiber temperature-sensing fire detecting system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207883078U (en) |
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2017
- 2017-11-24 CN CN201721598005.4U patent/CN207883078U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180918 Termination date: 20191124 |