CN106225949A - Wavelength-division multiplex dual-wavelength optical-fiber delay temperature sensor - Google Patents
Wavelength-division multiplex dual-wavelength optical-fiber delay temperature sensor Download PDFInfo
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- CN106225949A CN106225949A CN201610633102.6A CN201610633102A CN106225949A CN 106225949 A CN106225949 A CN 106225949A CN 201610633102 A CN201610633102 A CN 201610633102A CN 106225949 A CN106225949 A CN 106225949A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
Abstract
The invention discloses a kind of wavelength-division multiplex dual-wavelength optical-fiber delay temperature sensor, belong to optical fiber temperature sensor technology field, solve the problem that structure in prior art is complicated, cost is high and optical signal relative delay in transit time efficiency is low.The present invention includes dual wavelength light transmitter module, wavelength division multiplexer, Optical Receivers, signal processing and control module, Transmission Fibers and sensor fibre.The present invention uses the light path design of wavelength-division multiplex dual wavelength, determines temperature by measuring the relative delay of dual wavelength light signal, and sensor fibre uses common quartz (SiO2) optical fiber, improve the temperature range of measurement, the arrangement of temperature sensor thus formed is simple, low cost, application easy to spread.
Description
Technical field
A kind of wavelength-division multiplex dual-wavelength optical-fiber delay temperature sensor, for measuring the time delay of wavelength, is sensed
Temperature, the present invention relates to optical fiber temperature sensor technology field, is specifically related to a kind of dual-wavelength optical-fiber based on wavelength-division multiplex technique
Delay temperature sensor.
Background technology
Fibre optic temperature sensor have safety, lightweight, accurately, the advantage such as electromagnetism interference, be widely used in power equipment,
In the system for detecting temperature of hydroelectric facility and tunnel fire proofing, it is also employed in industrial and civilian needs each side thermometric
Face.
The technical method that generally fibre optic temperature sensor uses has: 1. temperature is by causing the change of fiber grating constant, enters
And change the spectrum of the transmission or reflection light of fiber grating, obtain the accurate survey to temperature by detecting the change of this spectrum
Amount；2. the laser of higher-wattage is by the non-linear Brillouin produced in a fiber or Raman back scattering, according to backward scattered
Spectrum change and backward scattered position, judge the change of temperature in optical fiber and the position of generation, thus obtain temperature and
The accurate measurement of distance.
Its common ground of the above two schemes is that their measurement is all converted into the accurate measurement to spectrum, thus obtains
Accurate measurement to temperature.In detecting technique, the accurate measurement to spectrum, it is required to more complicated measurement apparatus or is
System, the equipment cost that so certainly will cause this technological maheup is higher, should not popularize application in an all-round way.Meanwhile, higher temperature is being measured
Time, fiber grating is by not competent, and non-linear Brillouin or Raman scattering also will be limited by high temperature.
A kind of Dual-wavelength optical delay optical fiber temperature sensor, mandate Chinese invention patent number: though ZL201110383154.X
In place of so solving the problems referred to above, but still Shortcomings, as more complicated, the most concisely in (1) light path；(2) light path insertion loss
Bigger；(3) extinction ratio of wavelength selector is relatively low；(4) high in cost of production problem.
Summary of the invention
The present invention is directed to above-mentioned weak point and provide a kind of wavelength-division multiplex dual-wavelength optical-fiber delay temperature sensor, solve
In prior art, light path is more complicated, the most concisely；Light path insertion loss is relatively big, cost is high and the relative delay in transit of optical signal
The problem that time efficiency is low.
To achieve these goals, the technical solution used in the present invention is:
A kind of wavelength-division multiplex dual-wavelength optical-fiber delay temperature sensor, it is characterised in that: include dual wavelength light transmitter module,
Wavelength division multiplexer, Optical Receivers, signal processing and control module, Transmission Fibers and sensor fibre；
Described wavelength division multiplexer includes first wavelength division multiplexer, second wavelength division multiplexer and the 3rd wavelength-division multiplex
Device；
Described signal processing is with under the control of control module, and dual wavelength light transmitter module is simultaneously emitted by the first optical signal λ1With
Second optical signal λ2, the first optical signal λ1With the second optical signal λ2Wavelength differ, the first optical signal λ1With the second optical signal λ2
After first wavelength division multiplexer multiplexing inject Transmission Fibers, by Transmission Fibers arrive second wavelength division multiplexer, second
Wavelength division multiplexer demultiplexes the first optical signal λ1With the second optical signal λ2, the first optical signal λ after demultiplexing1With the second optical signal λ2
Arrive the 3rd wavelength division multiplexer by reference optical fiber and sensor fibre respectively and close ripple, after closing ripple, be sent to light by Transmission Fibers
Receiver module；Optical Receivers receives the first optical signal λ1With the second optical signal λ2, and by the first optical signal λ1With the second optical signal
λ2Signal processing and control module it is transferred to again after being converted into the signal of telecommunication；Signal processing measures two wavelength signals with control module
The relative delay in transit time, and be calculated temperature according to relative delay.
Further, described dual wavelength light transmitter module uses two semiconductor lasers or solid state laser, by directly
Intensity modulated or indirectly intensity modulated, launch continuous sine wave or pulsed light wave signal simultaneously.
Further, described wavelength division multiplexer uses interference light filtering film wavelength division multiplexer, arrayed waveguide grating multiplexer,
Or build wavelength division multiplexer by optical element.
Further, described Optical Receivers uses first that PIN or APD photodetector, detection are sent to by Transmission Fibers
Optical signal λ1With the second optical signal λ2, and by the first optical signal λ1With the second optical signal λ2It is converted into after the signal of telecommunication amplifies and exports, send
Reach signal processing and control module.
Further, described Transmission Fibers is quartz (SiO2) multimode fibre or single-mode fiber, or plastic optical fiber.
Further, described sensor fibre is quartz (SiO2) multimode fibre or single-mode fiber.
Further, described signal processing and control module can use high-precision analog and digital circuit to produce and control to send out
Penetrate signal, and measure the first optical signal λ received1With the second optical signal λ2The relative delay in transit time, thus calculate temperature
Degree.
Compared with prior art, it is an advantage of the current invention that:
One, the wavelength division multiplexer in the present invention has fabulous wavelength selective power, and 3 wavelength division multiplexers are same device
Part, this device is reciprocal device, is simply wave multiplexer application when, i.e. the signal of two wavelength closes 1 from 2 optical fiber
Transmission and channel-splitting filter in root optical fiber, be i.e. assigned in 2 optical fiber transmission the signal of two wavelength in 1 optical fiber；
Two, compared with a kind of Dual-wavelength optical delay optical fiber temperature sensor, simplify light channel structure light path devices quantity and
Kind all reduces, and uses 1 photo-coupler, 1 wavelength selector and 2 optical circulators to be optimized to 3 wavelength-divisions again from original
With device, kind is kept to a kind from 3 kinds, and quantity is kept to 3 from 4, and optical fiber connects reduces to 9 points from 11；
Three, compared with a kind of Dual-wavelength optical delay optical fiber temperature sensor, light path change makes original about 3000 yuan
Cost reduces 50%-75%；
Four, optimize light path insertion loss and decrease about about 3dB；
Five, sensor fibre uses quartz (SiO2) optical fiber, improve the measurement scope of temperature；
Six, i.e. can determine that temperature parameter, designed scheme work by the relative time delay time of measurement dual wavelength light signal
Make principle simple and convenient.
Accompanying drawing explanation
Fig. 1 is wavelength-division multiplex dual-wavelength optical-fiber delay temperature sensor schematic diagram；
In figure: 1 be wavelength division multiplexer, 2 be Transmission Fibers, 3 for sensor fibre, λ1It is the 1st optical signal, λ2It it is the 2nd light letter
Number.
Detailed description of the invention
Below in conjunction with the drawings and the specific embodiments, the invention will be further described.
Optical signal transmission in a fiber can bring delay, time delay just to become with the length of optical fiber and the refractive index of optical fiber
Ratio.Research shows quartz (SiO2) refractive index of optical fiber increases with the increase of temperature, therefore variations in temperature will cause optical signal
Additional transmission delay in a fiber.A dual wavelength light signal wherein road wavelength is reference optical signal, and another road wavelength is test
Optical signal, so forms differential configuration, it is easy to accurately measure time delay, and eliminates the impact of transmission light path, thus improves
The performance of light path and the certainty of measurement of temperature.
A kind of wavelength-division multiplex dual-wavelength optical-fiber delay temperature sensor, including dual wavelength light transmitter module, wavelength division multiplexer,
Optical Receivers, signal processing and control module, Transmission Fibers and sensor fibre；Described signal processing and the control of control module
Under, dual wavelength light transmitter module is simultaneously emitted by optical signal that is first optical signal and second optical signal of two different wave lengths, and these are two years old
Individual optical signal injects Transmission Fibers after first wavelength division multiplexer multiplexing, and optical signal reaches second wavelength-division by Transmission Fibers
Multiplexer, is demultiplexing as the first optical signal and the second optical signal, the first optical signal and the second optical signal and passes through reference optical fiber respectively
And sensor fibre, by Transmission Fibers, it is sent to Optical Receivers；Optical Receivers receives the first optical signal and the second light letter
Number, and it is transferred to signal processing and control module again after the first optical signal and the second optical signal are converted into the signal of telecommunication；At signal
Reason is measured the relative delay in transit time of two wavelength signals with control module, and is calculated temperature according to relative delay
Degree.
Embodiment
Described dual wavelength light transmitter module uses the semiconductor laser of 1531nm and 1551nm to be light source；Wavelength division multiplexer
The 1 two wave-length division multiplexers using interference light filtering film composition；Optical Receivers uses the PIN photodetection of 1550nm wave band
Device, preamplifier and main amplifier composition；Transmission Fibers 2 is made up of G.652 single-mode fiber；Sensor fibre 3 is coating by removing
100 meters of layer G.652 single-mode fiber is constituted；Signal processing and control module use high-precision analog and digital circuit produces and
Control to launch signal, and measure variations in temperature and cause the relative delay in transit time of two wavelength channels, thus calculate temperature
Degree.
Its work process is: under the signal processing control with control module, by direct intensity modulation, be simultaneously emitted by
The pulsed optical signals of two wavelength of 1531nm and 1551nm, is closed ripple by first wavelength division multiplexer of two wavelength and injects G.652 single
Mode fiber transmits, optical signal (the i.e. first optical signal λ1With the second optical signal λ2) arrive second wavelength-division multiplex by Transmission Fibers 2
Device, is demultiplexing as wavelength 1531nm optical signal and wavelength 1551nm optical signal, wavelength 1531nm optical signal and wavelength 1551nm light
Signal is respectively by reference optical fiber and sensor fibre 3, then is closed ripple by three wavelength division multiplexers, passes through Transmission Fibers 2, transmit after closing ripple
To Optical Receivers；Optical Receivers receives wavelength 1531nm optical signal and wavelength 1551nm optical signal, and by wavelength 1531nm
Optical signal and wavelength 1551nm optical signal are transferred to signal processing and control module after being converted into the signal of telecommunication again；Signal processing and control
Molding block is measured the relative delay in transit time of two wavelength channels, and is calculated temperature according to relative delay.
The arrangement of temperature sensor of present invention composition is simple, low cost, improve relative delay in transit time of optical signal
Efficiency, thus improve the computational efficiency of sensing temperature, application easy to spread.
Claims (7)
1. a wavelength-division multiplex dual-wavelength optical-fiber delay temperature sensor, it is characterised in that: include dual wavelength light transmitter module, ripple
Division multiplexer, Optical Receivers, signal processing and control module, Transmission Fibers and sensor fibre；
Described wavelength division multiplexer (1) includes first wavelength division multiplexer, second wavelength division multiplexer and the 3rd wavelength division multiplexer；
Described signal processing is with under the control of control module, and dual wavelength light transmitter module is simultaneously emitted by the first optical signal λ1With second
Optical signal λ2, the first optical signal λ1With the second optical signal λ2Wavelength differ, the first optical signal λ1With the second optical signal λ2Through
After one wavelength division multiplexer multiplexing inject Transmission Fibers (2), by Transmission Fibers (2) arrive second wavelength division multiplexer, second
Wavelength division multiplexer demultiplexes the first optical signal λ1With the second optical signal λ2, the first optical signal λ after demultiplexing1With the second optical signal
λ2Arrive the 3rd wavelength division multiplexer by reference optical fiber and sensor fibre (3) respectively and close ripple, passed by Transmission Fibers after closing ripple
Deliver to Optical Receivers；Optical Receivers receives the first optical signal λ1With the second optical signal λ2, and by the first optical signal λ1With second
Optical signal λ2Signal processing and control module it is transferred to again after being converted into the signal of telecommunication；Signal processing measures two ripples with control module
The relative delay in transit time of long signal, and it is calculated temperature according to relative delay.
A kind of wavelength-division multiplex dual-wavelength optical-fiber delay temperature sensor the most according to claim 1, it is characterised in that: described
Dual wavelength light transmitter module uses two semiconductor lasers or solid state laser, is adjusted by direct intensity modulation or indirect intensity
System, launches continuous sine wave or pulsed light wave signal simultaneously.
A kind of wavelength-division multiplex dual-wavelength optical-fiber delay temperature sensor the most according to claim 1, it is characterised in that: described
Wavelength division multiplexer (1) uses interference light filtering film wavelength division multiplexer, arrayed waveguide grating multiplexer, or passes through optical element
Build wavelength division multiplexer.
A kind of wavelength-division multiplex dual-wavelength optical-fiber delay temperature sensor the most according to claim 1, it is characterised in that: described
Optical Receivers uses PIN or APD photodetector, the first optical signal λ that detection is sent to by Transmission Fibers1With the second optical signal
λ2, and by the first optical signal λ1With the second optical signal λ2It is converted into after the signal of telecommunication amplifies and exports, send to signal processing and control mould
Block.
A kind of wavelength-division multiplex dual-wavelength optical-fiber delay temperature sensor the most according to claim 1, it is characterised in that: described
Transmission Fibers (2) is quartz (SiO2) multimode fibre or single-mode fiber, or plastic optical fiber.
A kind of wavelength-division multiplex dual-wavelength optical-fiber delay temperature sensor the most according to claim 1, it is characterised in that described
Sensor fibre (3) is quartz (SiO2) multimode fibre or single-mode fiber.
A kind of wavelength-division multiplex dual-wavelength optical-fiber delay temperature sensor the most according to claim 1, it is characterised in that: described
Signal processing and control module can use high-precision analog and digital circuit to produce and control to launch signal, and measurement receives
The first optical signal λ1With the second optical signal λ2The relative delay in transit time, thus calculate temperature.
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Cited By (3)
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| CN109612600A (en) * | 2019-01-31 | 2019-04-12 | 珠海艾文科技有限公司 | Optical fiber sensing probe and optical fiber sensing system based on Curie temperature jump |
| CN110672137A (en) * | 2019-10-18 | 2020-01-10 | 北京交通大学 | Interference type optical fiber vibration sensing system based on wavelength division multiplexing and microwave photon technology |
| CN113359369A (en) * | 2021-05-11 | 2021-09-07 | 上海交通大学 | High-frequency anti-aliasing band-pass adjustable optical analog-to-digital conversion device |
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|---|---|---|---|---|
| CN109612600A (en) * | 2019-01-31 | 2019-04-12 | 珠海艾文科技有限公司 | Optical fiber sensing probe and optical fiber sensing system based on Curie temperature jump |
| CN110672137A (en) * | 2019-10-18 | 2020-01-10 | 北京交通大学 | Interference type optical fiber vibration sensing system based on wavelength division multiplexing and microwave photon technology |
| CN113359369A (en) * | 2021-05-11 | 2021-09-07 | 上海交通大学 | High-frequency anti-aliasing band-pass adjustable optical analog-to-digital conversion device |
| CN113359369B (en) * | 2021-05-11 | 2023-11-14 | 上海交通大学 | High-frequency anti-aliasing band-pass adjustable light analog-to-digital conversion device |
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