CN105737753B - A kind of light intensity modulation type signal demodulating system and signal demodulating method - Google Patents
A kind of light intensity modulation type signal demodulating system and signal demodulating method Download PDFInfo
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- CN105737753B CN105737753B CN201610077376.1A CN201610077376A CN105737753B CN 105737753 B CN105737753 B CN 105737753B CN 201610077376 A CN201610077376 A CN 201610077376A CN 105737753 B CN105737753 B CN 105737753B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
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Abstract
A kind of light intensity modulation type signal demodulating system and signal demodulating method disclosed by the invention, belong to light intensity modulation technical field.Driving source is provided using high performance function signal generator as light modulating signal, enters sensor fibre and reference arm optical fiber by fiber coupler, reflected light carries strain and temperature information and reaches photodetector by coupler.Signal accesses oscillograph after amplifying, being filtered to observe phase differential.System structure setting is simple, and high sensitivity, precision is high, is swift in response；This method can be used in needing to obtain the various occasions of real-time strain monitoring data.
Description
Technical field
The invention belongs to light intensity modulation technical field, it is related to a kind of light intensity modulation type signal demodulating system and signal solution
A kind of tune method, and in particular to light intensity modulation type signal demodulating system of the polymer optical fiber strain transducer with temperature-compensating
And signal demodulating method.
Background technique
With the gradually spirit to automation and intelligent development, to sensor of the fields such as modern industry, space technology, military affairs
The requirement of sensitivity, precision, reliability etc. is continuously increased, and optical fiber sensor is because of its high sensitivity, stronger electromagnetism interference energy
Power, good dynamic range, small in size, corrosion-resistant, fast response time, networking, distribution, multiple spot, big region, synchronous detection
The advantages that, by the favor of domestic and international expert and user.The device and glass optical fiber of plastic polymer optical fiber perceptually signal
It is more compared to having the advantages that: (a) polymer optical fiber sensor flexible, smaller Young's modulus, bigger thermo-optical coeffecient and more
Big thermal expansion coefficient is capable of providing higher sensitivity and broader response range；(b) plastic optical fiber transceiver module uses
The feux rouges of 650nm wavelength drops demodulating system cost substantially as electrical/optical or optical electrical switching device, direct voltage output signal
It is low；(c) have better bend performance, core diameter big, numerical aperture is big, with the coupling efficiency of light source and receiver height, end face
Processing is simple, has many advantages, such as easy connection type and simple interface unit.
Currently used fibre optic strain sensor has: Brillouin scattering distribution, grating type optical fiber, mode-interference type, light
Intensity modulation type etc., they have, and high sensitivity, anti-electromagnetic interference capability is strong, dynamic range is big, fast response time, can carry out
The advantages that networking, distribution, multiple spot, big region, synchronous detection, the attention by lot of domestic and foreign researcher.But preceding three classes
Fibre optical sensor needs expensive making apparatus, laser light source, optical coupling device, electrooptical device etc. and manufacture craft
It is relative complex.And existing polymer optical fiber strain transducer precision is not high and do not had temperature compensation function by temperature interference.
Summary of the invention
The purpose of the present invention is to provide a kind of light intensity modulation type signal demodulating system and signal demodulating method, the systems
Structure setting is simple, high sensitivity, and precision is high, is swift in response；This method can be used in needing to obtain real-time strain monitoring data
Various occasions.
The present invention is to be achieved through the following technical solutions:
A kind of light intensity modulation type signal demodulating system, including function signal generator, signal (FBG) demodulator, fiber coupling
Device, data acquisition module and oscillograph；
Function signal generator, signal (FBG) demodulator and fiber coupler are sequentially connected, and what function signal generator provided swashs
It encourages source and issues the light with modulated signal by signal (FBG) demodulator, light is divided into two branches using fiber coupler, first
Branch road is successively arranged the first fiber coupler, the first photodetector and for providing the sensor fibre of optical strain information, the
Two roads are successively arranged the second fiber coupler, the second photodetector and for providing the reference arm light of temperature compensation information
It is fine；First photodetector and the second photodetector are connected with data acquisition module respectively, data acquisition module and oscillograph
It is connected.
Function signal generator is connected with data acquisition module and oscillograph respectively.
The sensor fibre for providing optical strain information includes optical fiber kernel and the outer quilt of optical fiber, and optical fiber kernel is by fibre core
It is formed with surrounding layer；On any one section of the sensor fibre, the both ends of fibre core are cylindrical section, and middle part is biconial coupling
Section.
The reference arm optical fiber for providing temperature compensation information includes optical fiber kernel and the outer quilt of optical fiber, optical fiber kernel by
Fibre core and surrounding layer composition；On any one section of the reference arm optical fiber, the both ends of fibre core are cylindrical section, and middle part is bipyramid
Shape coupling section, the biconial coupling section is by biconial structural area and the package floor structure being coated on outside biconial structural area
At thin both ends are thick among biconial structural area and are arranged symmetrically；Biconial structural area matched with package floor to be formed it is cylindric
Structure, the cylindrical-shaped structure are identical as the cylindrical section radius at fibre core both ends；It is solid by gluing oxidant layer in the cylindrical-shaped structure
It is scheduled in structural substrates.
The least radius in cone area is r0 in the middle part of biconial structural area, and the radius of fibre core is r1, and r0 is the 0.2~0.9 of r1
Times.
The length of biconial coupling section is 10~100mm.
Gluing oxidant layer is also filled in biconial structural area and the gap of package floor cooperation.
The invention also discloses the methods for carrying out signal demodulation based on above-mentioned system, comprising the following steps:
1) function signal generator issues the driving source of light modulating signal, exports sinusoidal signal sin (2 π ft) to drive LED
Light source output electroencephalogram；
2) it is divided into two branches by the optical path of fiber coupler, electroencephalogram respectively enters sensor fibre and reference arm
Optical fiber, after reflection, sensor fibre carry the first photodetector that strain information passes through its branch road；Reference arm optical fiber is then taken
Pass through the second photodetector of its branch road with temperature information；First photodetector output electric signal beSecond photodetector output electric signal be
3) electric signal that step 2) obtains is accessed into after amplifying, being filtered oscillograph again, observes φ1、φ2With it is first
Beginning zero phase difference obtains light intensity modulation type signal and demodulates response results.
Compared with prior art, the invention has the following beneficial technical effects:
Light intensity modulation type signal demodulating system disclosed by the invention, using high performance function signal generator as light modulation
Signal provides driving source, enters sensor fibre and reference arm optical fiber by fiber coupler, into sensor fibre and reference arm light
Fine reflected light carries strain and temperature information respectively and reaches photodetector by fiber coupler.Signal is by amplification, filter
Oscillograph is accessed after wave processing to observe phase differential.System of the invention introduces optical fiber reference arm technology, can achieve to biography
The compensation that sensor temperature responds simultaneously can overcome general polymer fibre optic strain sensor to respond strain simultaneously with temperature
Disadvantage, thus signal demodulating system of the invention can effectively improve accuracy and sensitivity, be swift in response.
Further, the present invention concentrates principle using the stress of conical region, and biconial polymer optical fiber is answered
Become detection, optical fiber after possibly tapered under conditions of same pulling force, due to conical region stress concentrate so that this region
Strain variation it is larger, sensor output strain sensitivity just can accordingly improve.
Method disclosed by the invention based on above system is swift in response, precision height, high sensitivity, can be used in needing
Obtain the various occasions of real-time strain monitoring data.
Detailed description of the invention
Fig. 1 is light intensity modulation type signal demodulating system structural schematic diagram of the invention；
Fig. 2 is sensor of the invention polymer optical fiber section schematic cross-section；
Fig. 3 is the structural schematic diagram of Inventive polymers fibre optic strain sensor；
Fig. 4 is Inventive polymers fibre optic strain sensor biconial regional structure schematic diagram.
Wherein, 1 is function signal generator；2 signal (FBG) demodulators；3 be fiber coupler；4-1 is the first photodetection
Device；4-2 is the second photodetector；5 be data acquisition module；6 be oscillograph；7-1 is sensor fibre；7-2 is reference arm light
It is fine；8 be fibre core；9 be the outer quilt of optical fiber；10 be surrounding layer；11 be package floor；12 be structural substrates；13 be gluing oxidant layer.
Specific embodiment
Below with reference to specific embodiment, the present invention is described in further detail, it is described be explanation of the invention and
It is not to limit.
Referring to Fig. 1, light intensity modulation type signal demodulating system disclosed by the invention, including function signal generator 1, signal
(FBG) demodulator 2, fiber coupler 3, data acquisition module 5 and oscillograph 6.
Function signal generator 1, signal (FBG) demodulator 2 and fiber coupler 3 are sequentially connected, and function signal generator 1 provides
Driving source by signal (FBG) demodulator 2 issue have modulated signal light, light is divided into two branch using fiber coupler 3
Road, the first branch are equipped with the first fiber coupler 3-1, the first photodetector 4-1 and for providing the biography of optical strain information
Photosensitive fibre 7-1, second branch are equipped with the second fiber coupler 3-2, the second photodetector 4-2 and for providing temperature-compensating
The reference arm optical fiber 7-2 of information；First photodetector 4-1 and the second photodetector 4-2 respectively with 5 phase of data acquisition module
Even, data acquisition module 5 is connected with oscillograph 6.Function signal generator 1 respectively with 6 phase of data acquisition module 5 and oscillograph
Even.
Required experiment equipment such as data acquisition module 5, oscillograph 6 etc. is high-precision, highly sensitive electrical signal detection sets
Standby experiment equipment, it is ensured that undistorted to sensor output ultra-weak electronic signal in signal processing.
Referring to fig. 2, Fig. 3 and Fig. 4, it is described for provide the sensor fibre of optical strain information to include optical fiber kernel and optical fiber
It is outer by 9, optical fiber kernel is made of fibre core 8 and surrounding layer 10；On any one section of fibre optic strain sensor, the both ends of fibre core 8
For cylindrical section, middle part is biconial coupling section.
The reference arm optical fiber for providing temperature compensation information includes that optical fiber kernel and optical fiber are outer by 9, optical fiber kernel
It is made of fibre core 8 and surrounding layer 10；On any one section of the reference arm optical fiber, the both ends of fibre core 8 are cylindrical section, middle part
For biconial coupling section, the biconial coupling section is by biconial structural area and the encapsulation bottom being coated on outside biconial structural area
Plate 11 is constituted, and thin both ends are thick among biconial structural area and are arranged symmetrically；Biconial structural area matches shape with package floor 11
At cylindrical-shaped structure, the cylindrical-shaped structure is identical as the cylindrical section radius at 8 both ends of fibre core；The cylindrical-shaped structure bottom also
Equipped with structural substrates 12.
The central cone area least radius r of biconial structural area in sensor fibre and reference arm optical fiber0For fiber core half
Diameter r10.2~0.9 times, the central cone area radius r of biconial structural area0Smaller, sensitivity is higher.Above-mentioned biconial structure is gone
Length can be between 10~100mm.
After biconial structural area is introduced into optical fiber, the mode propagated in optical fiber can be made a significant impact, different mode it
Between energy coupling and interference effect can occur to realize the perception to a variety of physical quantitys.Its compact-sized, good mechanical stability, sound
Answer speed fast.The present invention concentrates principle using the stress of conical region, and biconial polymer optical fiber is applied to strain detecting, light
Fibre after possibly tapered under conditions of same pulling force, due to conical region stress concentrate so that this region strain variation
Larger, sensor output strain sensitivity just can accordingly improve.
The method for carrying out signal demodulation based on system disclosed above, the present invention are as follows:
Driving source is provided with high performance function signal generator 1, issuing by signal (FBG) demodulator 2 has modulated signal
Optical path is divided into two by fiber coupler 3 and respectively enters sensor fibre and reference arm optical fiber by light, and reflected light passes through optical fiber coupling
Optical signal is changed into electric signal by photodetector and is stored in data acquisition module 5 by clutch 3, and is shown on oscillograph 6.
1 excitation source signal of function signal generator can also be read out on oscillograph 6 and be stored in data acquisition module 5.
Function signal generator 1 provides driving source for light modulating signal, it is assumed that it exports sinusoidal signal sin (2 π ft) to drive
Dynamic LED light source exports electroencephalogram, is divided into two branches by the optical path of fiber coupler 3, electroencephalogram respectively enters
Sensor fibre and reference arm optical fiber, after reflection, sensor fibre carry the first photodetection that strain information passes through its branch road
Device 4-1；Reference arm optical fiber then carries the second photodetector 4-2 that temperature information passes through its branch road；First photodetector
4-1 output electric signal beSecond photodetector 4-2 output electric signal beAgain will
The electric signal of acquisition accesses oscillograph 6 after amplifying, being filtered, observationWith initial zero phase difference, light is obtained
Intensity modulation type signal demodulates response results.
In conclusion due to the problem of polymer optical fiber strain transducer responds strain with temperature simultaneously in the prior art
It is difficult to solve by single fibre optical sensor, the present invention starts with from optical fiber reference arm technology and light intensity modulation technology, grinds first
Study carefully the influence of optical fiber thermo-optical coeffecient and thermal expansion coefficient to reference arm optical fiber lightwave transmission characteristics, discloses it and change with ambient temperature
Rule；Secondly, the parameters such as binding analysis optical fiber thermo-optical coeffecient, thermal expansion coefficient, stress optical coefficient are to sensor evanescent waves
The relationship of itself and stress, temperature change is specified in the influence of characteristic；Finally, to reject temperature interference, on this basis regulation experiment
Parameter (waveform and its frequency of modulation light, amplitude etc.), and to influence strain transducer it is sensitive with Temperature cross-over in each ginseng
Number optimizes (lambda1-wavelength, sensor and reference arm fiber lengths, transmission fiber length etc.).For the sensor of high stable
Selection (waveform and its frequency of such as modulation light, amplitude, the incidence of relevant parameter in demodulating system circuit design and hardware realization
Optical wavelength, sensor and reference arm fiber lengths, transmission fiber length etc.) strong reference is provided.
Optical fiber reference arm technology and light intensity modulation technology are applied to polymer optical fiber strain sensing temperature and mended by the present invention
Repay in experimental program, using high-precision function signal generator as modulated optical signal driving source, guarantee multiple waveforms and its
Frequency, amplitude accurately trigger；Use high-precision data acquisition module, it is ensured that signal energy in the processing such as acquisition, amplification, denoising
Enough it is maximally maintained original waveform；Using high-precision oscillograph, guarantee that tiny signal can detect capture.So this reality
Testing building plan has very high sensitivity to the phase-detection of modulation light, and the Optimal Parameters thus to set out be (modulation light
Waveform and its frequency, amplitude etc.) effective reference is provided to the circuit design and hardware realization of the sensor demodulating system of high stable.
On the basis of carrying out theoretical modeling and experiment to sensor and reference arm optical fiber, it is poly- to establish complete light intensity modulation type comprehensively
Object fibre optic strain sensor Design of Temperature Compensation scheme is closed, and to the method that relevant parameter in scheme optimizes.
Claims (4)
1. a kind of light intensity modulation type signal demodulating system, which is characterized in that demodulated including function signal generator (1), signal
Instrument (2), fiber coupler (3), data acquisition module (5) and oscillograph (6)；
Function signal generator (1), signal (FBG) demodulator (2) and fiber coupler (3) are sequentially connected, function signal generator (1)
The driving source of offer issues the light with modulated signal by signal (FBG) demodulator (2), is divided into two using fiber coupler (3)
Branch is successively arranged the first fiber coupler (3-1), the first photodetector (4-1) in the first branch and answers for providing light
Become the sensor fibre (7-1) of information, is successively arranged the second fiber coupler (3-2), the second photodetector (4- in second branch
2) and for providing the reference arm optical fiber (7-2) of temperature compensation information；First photodetector (4-1) and the second photodetector
(4-2) is connected with data acquisition module (5) respectively, and data acquisition module (5) is connected with oscillograph (6)；Function signal generator
(1) it is connected respectively with data acquisition module (5) and oscillograph (6)；The sensor fibre for providing optical strain information includes
Optical fiber kernel and optical fiber are outer by (9), and optical fiber kernel is made of fibre core (8) and surrounding layer (10)；In any one of the sensor fibre
Duan Shang, the both ends of fibre core (8) are cylindrical section, and middle part is biconial coupling section；Area is bored most in the middle part of biconial structural area
Minor radius is r0, and the radius of fibre core (8) is r1, and r0 is 0.2~0.9 times of r1.
2. light intensity modulation type signal demodulating system according to claim 1, which is characterized in that biconial coupling section
Length is 10~100mm.
3. light intensity modulation type signal demodulating system according to claim 1, which is characterized in that biconial structural area and envelope
Gluing oxidant layer (13) are also filled in the gap of dress bottom plate (11) cooperation.
4. the method for carrying out signal demodulation based on system described in any one of claims 1 to 3, which is characterized in that including
Following steps:
1) function signal generator (1) issues the driving source of light modulating signal, exports sinusoidal signal sin (2 π ft) to drive LED
Light source output electroencephalogram；
2) it is divided into two branches by the optical path of fiber coupler (3), electroencephalogram respectively enters sensor fibre (7-1) and ginseng
Arm optical fiber (7-2) is examined, after reflection, sensor fibre carries the first photodetector (4-1) that strain information passes through its branch road；
Reference arm optical fiber then carries the second photodetector (4-2) that temperature information passes through its branch road；First photodetector (4-1)
The electric signal of output isSecond photodetector (4-2) output electric signal be
3) electric signal that step 2) obtains is accessed into after amplifying, being filtered oscillograph (6) again, observedWith it is initial
Zero phase difference obtains light intensity modulation type signal and demodulates response results.
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| CN105738007A (en) * | 2016-02-03 | 2016-07-06 | 西安交通大学 | Biconical polymer optical fiber probe and preparation method thereof and temperature sensor |
| CN108036728A (en) * | 2017-12-14 | 2018-05-15 | 大连理工大学 | A kind of phase difference solution mode fiber optics displacement measuring method and instrument |
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| CN1699943A (en) * | 2005-05-27 | 2005-11-23 | 上海大学 | Hipyramid type optical fiber fade down wave temperature sensor and method for manufacturing its bipyramid optical fiber probe |
| CN101701859A (en) * | 2009-11-18 | 2010-05-05 | 华北电力大学 | Fiber grating monitoring system for power transmission line |
| CN103940361A (en) * | 2014-04-30 | 2014-07-23 | 中国科学院半导体研究所 | Fiber bragg grating low-frequency strain sensing demodulation system |
| CN104218992A (en) * | 2014-09-15 | 2014-12-17 | 中国科学院半导体研究所 | Homodyne detection type coherent light transmission system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101680782B (en) * | 2008-02-29 | 2012-09-12 | 株式会社藤仓 | Physical quantity measuring device of optical frequency range reflection measuring type, and temperature and strain measuring method using the device, and method for determining position of sensor |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1699943A (en) * | 2005-05-27 | 2005-11-23 | 上海大学 | Hipyramid type optical fiber fade down wave temperature sensor and method for manufacturing its bipyramid optical fiber probe |
| CN101701859A (en) * | 2009-11-18 | 2010-05-05 | 华北电力大学 | Fiber grating monitoring system for power transmission line |
| CN103940361A (en) * | 2014-04-30 | 2014-07-23 | 中国科学院半导体研究所 | Fiber bragg grating low-frequency strain sensing demodulation system |
| CN104218992A (en) * | 2014-09-15 | 2014-12-17 | 中国科学院半导体研究所 | Homodyne detection type coherent light transmission system |
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