CN109556756A - Temperature sensor based on multi-wavelength optical fiber laser cursor effect - Google Patents
Temperature sensor based on multi-wavelength optical fiber laser cursor effect Download PDFInfo
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- CN109556756A CN109556756A CN201811609127.8A CN201811609127A CN109556756A CN 109556756 A CN109556756 A CN 109556756A CN 201811609127 A CN201811609127 A CN 201811609127A CN 109556756 A CN109556756 A CN 109556756A
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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 belongs to technical field of optical fiber sensing, more particularly to the temperature sensor based on multi-wavelength optical fiber laser cursor effect, it include: the pump light source set gradually along optical path direction, wavelength division multiplexer, Er-doped fiber, optical fiber FP filter, optical fiber Sagnac filter and spectrometer, the pump light of pump light source output passes through wavelength division multiplexer, wide range laser is exported after Er-doped fiber, wide range laser enters optical fiber FP filter multiwavelength laser, multiwavelength laser is by exporting the multi-wavelength optical fiber laser signal with envelope based on cursor effect in optical fiber Sagnac filter, multi-wavelength optical fiber laser signal input spectrum analyzer is to measure.Temperature sensor of the invention is controlled multi-wavelength output using optical fiber Sagnac filter, FP filter Mixed cascading, compares existing scalar filter multi-wavelength fiber laser sensor, temperature sensitivity is higher using Er-doped fiber as gain media.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, and in particular to the temperature based on multi-wavelength optical fiber laser cursor effect
Sensor.
Background technique
Optical fiber sensing technology is to rise along with the development of optical fiber technology and Fibre Optical Communication Technology the 1970s
A kind of New Sensing Technology；It is using light wave as transducing signal, using optical fiber as transmission medium, perception and the extraneous measured signal of detection,
Sensing mode, sensing principle and signal detection and in terms of all have very big difference with traditional electric sensor.
Optical fiber itself is not charged, small in size, quality is small, flexible, electromagnetism interference, radiation resistance are good, is particularly suitable for inflammable easy
Quick-fried, space be strictly limited and the adverse circumstances such as strong electromagnetic under use.Therefore optical fiber sensing technology once come out just by
Very big attention has obtained research and application in each key areas.
Multi-wavelength optical fiber laser (MWFL) has structure simple, the good compatibility with fibre system, anticorrosive, anti-electromagnetism
The advantages that interference and reaction sensitivity are high.Therefore, MWFL be widely used in modern optical communication, Photoelectric Detection and sensing,
The fields such as the embedded monitoring of structural body, aerospace.In MWFL, comb filtering list of the fibre optic interferometer usually as system
Member such as temperature, pressure, ultrasound, is opened in addition, fibre optic interferometer is also used as sensor to realize the detection to some parameters
Power, refractive index, humidity and gas concentration etc..And sensitivity is to characterize an important indicator of sensor performance, is passed so improving
The sensitivity of sensor has important practical significance.
However, existing multiple-wavelength laser temperature sensor is unfavorable for there are at high cost, structure is complicated, temperature sensitivity is low
The disadvantages of carrying out temperature detection.
Summary of the invention
In view of the above shortcomings of the prior art, the present invention provides the temperature based on multi-wavelength optical fiber laser cursor effect
Spend sensor.
In order to achieve the above object of the invention, the invention adopts the following technical scheme:
Temperature sensor based on multi-wavelength optical fiber laser cursor effect, comprising: the pump set gradually along optical path direction
Pu light source, wavelength division multiplexer, Er-doped fiber, optical fiber FP filter, optical fiber Sagnac filter and spectrometer, pump light source output
Pump light wide range laser is exported after wavelength division multiplexer, Er-doped fiber, wide range laser enters optical fiber FP filter multi-wavelength
Laser, multiwavelength laser is by exporting the multi-wavelength optical-fiber laser with envelope based on cursor effect in optical fiber Sagnac filter
Signal, multi-wavelength optical fiber laser signal input spectrum analyzer is to measure.
Preferably, the optical fiber Sagnac filter include polarization maintaining optical fibre and tool there are four port optical coupling
Device.
Preferably, the input port of the pump light source and wavelength division multiplexer connects, the output of wavelength division multiplexer
Port and one end of Er-doped fiber connect, the input port of the other end connection optical fiber FP filter of Er-doped fiber, optical fiber FP filter
The output port of wave device and the first port of photo-coupler connect, and the third port of photo-coupler and one end of polarization maintaining optical fibre connect
It connects, the other end of polarization maintaining optical fibre and the 4th port of photo-coupler connect, and the second port of photo-coupler is connect with spectrometer.
Preferably, the polarization maintaining optical fibre is panda type polarization-preserving fiber, claps a length of 3.8mm, length 6.6m, is worked
Range is 1530~1580nm.
Preferably, the working range of the optical fiber FP filter and photo-coupler is 1530~1580nm.
Preferably, the optical fiber FP filter is divided into 0.78nm between freely composing at 1530nm.
Preferably, four ports of the photo-coupler are the port of splitting ratio 50%.
Preferably, the gain ranging of the Er-doped fiber is 1530~1570nm.
Preferably, the pump light source is 980nm pump light source.
Preferably, the cursor effect uses FP filter and optical fiber sagnac filter output wavelength to make respectively
For sliding and fixed part vernier graduation；Overlapping between two scales is for measuring；The interference overlap of peaks of two filters
Peak value is presented at wavelength, all peak values form spectrum envelope, and the free spectrum zone of envelope meets:
FSRenvelope=FSR1FSR2/|FSR1-FSR2|
Wherein, FSR1、FSR2、FSRenvelopeRespectively represent Sagnac filter, FP filter and envelope freely composes model
It encloses；When temperature drift occurs for Sagnac filter output spectra, temperature sensitivity amplifies M times by cursor effect, amplification factor M are as follows: M
=FSR1/|FSR1-FSR2|。
Compared with prior art, the present invention beneficial effect is:
The present invention is based on the temperature sensors of multi-wavelength optical fiber laser cursor effect, are situated between using Er-doped fiber as gain
Matter controls multi-wavelength output using optical fiber Sagnac filter, FP filter Mixed cascading, more compared to existing scalar filter
Long wavelength fiber laser sensor, temperature sensitivity is higher, can achieve 10.35nm/ DEG C；Structure is simple, it is at low cost, be easy to
Fibre system is integrated, temperature sensitivity is high, the stability of laser output is good.
Detailed description of the invention
Fig. 1 is the structural representation of the temperature sensor based on multi-wavelength optical fiber laser cursor effect of the embodiment of the present invention
Figure；
Fig. 2 is the temperature sensor based on multi-wavelength optical fiber laser cursor effect of the embodiment of the present invention at 23 DEG C and 24
DEG C output light spectrogram.
Specific embodiment
Below by specific embodiment the technical scheme of the present invention will be further described explanation.
As shown in Figure 1, the temperature sensor based on multi-wavelength optical fiber laser cursor effect of the embodiment of the present invention, including
There are four the photo-couplers 5 of port, bear for 980nm pump light source 1, wavelength division multiplexer 2, Er-doped fiber 3, optical fiber FP filter 4, tool
Cat type polarization maintaining optical fibre 26 and spectrometer 7；Wherein, Er-doped fiber 3 is used as gain media, and gain ranging is 1530nm to 1570nm；
Wavelength division multiplexer 2, optical fiber FP filter 4, photo-coupler 5 working range be 1530nm to 1580nm, optical fiber FP filter 4
Free spectral limit is 0.78nm at 1530nm；Four ports of photo-coupler 5 are the port of splitting ratio 50%, second end
Mouth h is as laser output mouth；The a length of 3.8mm of the bat of panda protecting polarized light fiber 6, length 6.6m, working range be 1530nm extremely
1580nm。
Specific connection structure are as follows: 980nm pump light source 1 is connect with the 980nm wavelength input port a of wavelength division multiplexer 2,
The output port b of wavelength division multiplexer 2 is connect with one end of Er-doped fiber 3, and the other end of Er-doped fiber 3 connects optical fiber FP filter
4 input port, the output port of optical fiber FP filter 4 are connect with the first port d of photo-coupler 5, the third of photo-coupler 5
Port e is connect with one end of panda type polarization-preserving fiber 6, the other end of panda type polarization-preserving fiber 6 and the 4th port of photo-coupler 5
The second port h of f connection, photo-coupler 5 is connect with spectrometer 7, obtains 10.35nm/ DEG C of multi-wavelength temperature spirit from spectrometer 7
Sensitivity.The embodiment of the present invention is using optical fiber FP filter and the optical fiber Sagnac being made of polarization maintaining optical fibre and four port couplers filter
The output waveform of wave device cascade structure co- controlling optical fiber laser, to obtain the multi-wavelength with envelope based on cursor effect
Optical-fiber laser signal；The temperature spirit of single filter output wavelength is replaced using the temperature sensitivity of filter cascaded-output envelope
Sensitivity.
The basic principle of the temperature sensor based on multi-wavelength optical fiber laser cursor effect of the embodiment of the present invention are as follows:
The pump light that 980nm pump light source 1 exports enters Er-doped fiber 3 along wavelength division multiplexer after wavelength division multiplexer 2 and generates self-excitation
Radiation exports wide range laser, and wide range laser enters in optical fiber FP filter 4, generates the multi-wavelength that 0.78nm is divided between freely composing
Laser, first port d of the multiwavelength laser Jing Guo four port couplers 5 enter by 5 structure of panda type polarization-preserving fiber 6 and photo-coupler
At optical fiber Sagnac filter in, be divided into 0.88nm between freely composing, based on cursor effect output envelope freely compose be 5.57nm
Multi-wavelength optical fiber laser signal, finally enter spectroanalysis instrument (model AQ6370B) 7 to be observed and measured.
Cursor effect uses FP filter and optical fiber sagnac filter output wavelength as sliding and fixed part respectively
Vernier graduation.Overlapping between two graduation marks is for measuring.Peak value is presented at the wavelength of the interference overlap of peaks of two filters,
And the height of each of these peak values will be determined by lap.When the peak value of two interferometers is in phase co-wavelength, always
The top of output occurs.All peak values form spectrum envelope, and the free spectrum zone (FSR) of envelope is given by:
FSRenvelope=FSR1FSR2/|FSR1-FSR2|
Wherein, FSR1、FSR2、FSRenvelopeRespectively represent Sagnac filter, FP filter and envelope freely composes model
It encloses；When temperature drift occurs for Sagnac filter output spectra, temperature sensitivity amplifies M times by cursor effect, amplification factor M are as follows: M
=FSR1/|FSR1-FSR2|。
The present invention opens pump light source and adjusts the output power of pump light source, controls laser output power；Selection is closed
The optical fiber FP filter of suitable filtering characteristic, selects appropriate length Er-doped fiber and panda type polarization-preserving fiber, in the effect of pump light
Lower generation self-excitation radiation, in optical fiber FP filter and panda protecting polarized light fiber, there are four the light that the photo-coupler 5 of port is constituted with tool
Under fine Sagnac filter effect, output envelope is generated.
The sensing process of the temperature sensor based on multi-wavelength optical fiber laser cursor effect of the embodiment of the present invention:
1, according to the output envelope range of the multi-wavelength optical fiber laser of required acquisition, mixing for corresponding gain ranging is selected
Erbium optical fiber, and Er-doped fiber length is determined according to line loss.
2, the ring of light of the output wavelength range for the multi-wavelength optical fiber laser that the covering of selection operating wavelength range needs to obtain
Row device and photo-coupler.
3, optical fiber FP filter is chosen according to required acquisition temperature sensitivity and freely composes interval, and select appropriate length bear
Cat polarization maintaining optical fibre.
4, pump light source is opened, pump light source output power is adjusted, multiple-wavelength laser, which is realized, stablizes multi-wavelength output packet
Network.
5, same spectroanalysis instrument of crossing measures the frequency displacement under output envelope different temperatures, carries out temperature sensing.
One trough of the output envelope of the temperature sensor of multi-wavelength optical fiber laser cursor effect is carried out continuous
Tracking, available output envelope vary with temperature situation, as shown in Fig. 2, changing to 24 DEG C from 23 DEG C in temperature, envelope occurs
The red shift of 10.35nm, it can obtain temperature sensitivity and be 10.35nm/ DEG C imitating based on multi-wavelength optical fiber laser vernier
The temperature sensor answered；Its temperature measurement range and temperature sensitivity are controlled by filtering device and gain media, with various light
The continuous development of electrical part, it will obtain higher temperature sensitivity, and its application also will more extensively.
The preferred embodiment of the present invention and principle are described in detail above, to those skilled in the art
Speech, the thought provided according to the present invention will change in specific embodiment, and these changes also should be regarded as the present invention
Protection scope.
Claims (10)
1. the temperature sensor based on multi-wavelength optical fiber laser cursor effect characterized by comprising successively along optical path direction
Pump light source, wavelength division multiplexer, Er-doped fiber, optical fiber FP filter, optical fiber Sagnac filter and the spectrometer of setting, pumping
The pump light of light source output exports wide range laser after wavelength division multiplexer, Er-doped fiber, and wide range laser enters optical fiber FP filtering
Device multiwavelength laser, multiwavelength laser is by exporting the multi-wavelength with envelope based on cursor effect in optical fiber Sagnac filter
Optical-fiber laser signal, multi-wavelength optical fiber laser signal input spectrum analyzer is to measure.
2. the temperature sensor according to claim 1 based on multi-wavelength optical fiber laser cursor effect, which is characterized in that
The optical fiber Sagnac filter include polarization maintaining optical fibre and tool there are four port photo-coupler.
3. the temperature sensor according to claim 2 based on multi-wavelength optical fiber laser cursor effect, which is characterized in that
The connection of the input port of the pump light source and wavelength division multiplexer, the output port of wavelength division multiplexer and one end of Er-doped fiber connect
It connects, the input port of the other end connection optical fiber FP filter of Er-doped fiber, the output port and optical coupling of optical fiber FP filter
The first port of device connects, and the third port of photo-coupler and one end of polarization maintaining optical fibre connect, the other end and light of polarization maintaining optical fibre
4th port of coupler connects, and the second port of photo-coupler is connect with spectrometer.
4. the temperature sensor according to claim 3 based on multi-wavelength optical fiber laser cursor effect, which is characterized in that
The polarization maintaining optical fibre is panda type polarization-preserving fiber, claps a length of 3.8mm, length 6.6m, and working range is 1530~1580nm.
5. the temperature sensor according to claim 2 based on multi-wavelength optical fiber laser cursor effect, which is characterized in that
The working range of the optical fiber FP filter and photo-coupler is 1530~1580nm.
6. the temperature sensor according to claim 5 based on multi-wavelength optical fiber laser cursor effect, which is characterized in that
The optical fiber FP filter is divided into 0.78nm between freely composing at 1530nm.
7. the temperature sensor according to claim 3 based on multi-wavelength optical fiber laser cursor effect, which is characterized in that
Four ports of the photo-coupler are the port of splitting ratio 50%.
8. the temperature sensor according to claim 1 based on multi-wavelength optical fiber laser cursor effect, which is characterized in that
The gain ranging of the Er-doped fiber is 1530~1570nm.
9. the temperature sensor according to claim 1 based on multi-wavelength optical fiber laser cursor effect, which is characterized in that
The pump light source is 980nm pump light source.
10. -9 described in any item temperature sensors based on multi-wavelength optical fiber laser cursor effect according to claim 1,
It is characterized in that, the cursor effect uses FP filter and optical fiber sagnac filter output wavelength as sliding respectively and fixes
Part vernier graduation；Overlapping between two scales is for measuring；Peak is presented at the wavelength of the interference overlap of peaks of two filters
Value, all peak values form spectrum envelope, and the free spectrum zone of envelope meets:
FSRenvelope=FSR1FSR2/|FSR1-FSR2|
Wherein, FSR1、FSR2、FSRenvelopeRespectively represent the free spectral limit of Sagnac filter, FP filter and envelope；When
Temperature drift occurs for Sagnac filter output spectra, and temperature sensitivity amplifies M times by cursor effect, amplification factor M are as follows: M=
FSR1/|FSR1-FSR2|。
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| CN201811609127.8A CN109556756B (en) | 2018-12-27 | 2018-12-27 | Temperature sensor based on vernier effect of multi-wavelength fiber laser |
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Cited By (3)
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| CN112161723A (en) * | 2020-09-04 | 2021-01-01 | 苏州易奥秘光电科技有限公司 | Temperature sensor based on vernier effect of optical resonant cavity and control method thereof |
| CN112816096A (en) * | 2021-03-08 | 2021-05-18 | 杭州电子科技大学 | Cascade interferometer optical fiber temperature sensor based on vernier effect |
| CN113029218A (en) * | 2021-03-11 | 2021-06-25 | 西北大学 | Vernier effect optical fiber interference sensor demodulation device and method based on silicon-based micro-ring |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112161723A (en) * | 2020-09-04 | 2021-01-01 | 苏州易奥秘光电科技有限公司 | Temperature sensor based on vernier effect of optical resonant cavity and control method thereof |
| CN112816096A (en) * | 2021-03-08 | 2021-05-18 | 杭州电子科技大学 | Cascade interferometer optical fiber temperature sensor based on vernier effect |
| CN113029218A (en) * | 2021-03-11 | 2021-06-25 | 西北大学 | Vernier effect optical fiber interference sensor demodulation device and method based on silicon-based micro-ring |
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