CN106525091A - Fiber grating array sensing demodulation system based on multi-wavelength pulse differential modulation - Google Patents
Fiber grating array sensing demodulation system based on multi-wavelength pulse differential modulation Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35383—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using multiple sensor devices using multiplexing techniques
- G01D5/35387—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using multiple sensor devices using multiplexing techniques using wavelength division multiplexing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/36—Forming the light into pulses
- G01D5/38—Forming the light into pulses by diffraction gratings
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Abstract
The invention discloses a fiber grating array sensing demodulation system based on multi-wavelength pulse differential modulation. The system comprises the components of a multi-wavelength laser source, a photoelectric modulator, a fiber grating sensing link and a demodulation device. The fiber grating sensing link comprises an optical circulator, an optical wavelength division multiplexer, n optical delay lines and a fiber grating array which is composed of n fiber gratings. The system determines the positions of sensing grating units through pulse light returning time, thereby quickly and accurately determining an actual corresponding position of a changed sensing parameter in a relatively large sensing monitoring area. Multi-wavelength modulation technology is utilized for modulating the pulse light on multiple wavelengths as sensing signal light. The system has higher power spectrum density and furthermore has higher signal-to-noise ratio in receiving. Two different adjacent wavelengths are utilized in different sensing branches. Through wavelength multiplexing technology, parallel processing can be performed on reflected light of different sensing branches, thereby improving speed in sensor demodulation.
Description
Technical field
The invention belongs to sensory field of optic fibre, more particularly, to a kind of optical fiber based on multi-Wavelength Pulses differential modulation
Grating array sensing demodulating system.
Background technology
Demodulation of Fiber Grating Sensor is an important field of research of fiber grating sensing technology engineering chemistry database.
Using optical fiber as transmission medium, by the extensive incoming fiber optic grating sensing cell array of various sensing multiplex techniques, so as to reality
Existing Large Copacity, high accuracy, the quasi-distributed fiber grating sensor-based system of long range and network.As fiber-optic grating sensor has
The unique advantage such as small volume, light weight, safe, electromagnetism interference, corrosion-resistant, compares traditional sensor-based system, optical fiber light
Grid sensor-based system is more widely used in engineering structure health monitoring, environmental index monitoring and protecting, power grid security fortune with network
In the special dimensions such as row maintenance, exploration of ocean resources exploitation, national defense safety.At present, fiber grating sensing system and network faces
That sensing and demodulating finite capacity, sensing and demodulating speed are relatively slow and demodulation signal to noise ratio requires the difficult problem such as higher.
The content of the invention
For the defect of prior art, it is an object of the invention to provide a kind of light based on multi-Wavelength Pulses differential modulation
Fine grating array sensing demodulating system, it is intended to solve to solve in traditional Fibre Optical Sensor demodulating system that capacitance-adjustable is little, demodulation speed is slow
And the problem that demodulation required signal-to-noise ratio is high.
The invention provides a kind of optical fiber optical grating array sensing demodulating system based on multi-Wavelength Pulses differential modulation, bag
Include：Multiple wavelength laser light source, electrooptic modulator, optical fiber grating sensing link and demodulating equipment；The input of the electrooptic modulator
End is connected to the output end of multiple wavelength laser light source, and the input of the optical fiber grating sensing link is connected to the electro-optical modulation
The output end of device, the output end of the optical fiber grating sensing link connect the demodulating equipment；The multiple wavelength laser light source is used
In the continuous light of generation multi-wavelength；The electrooptic modulator is for obtaining after time domain carries out intensity modulated to the continuous light of the multi-wavelength
Obtain the modulated pulse trains of certain repetition rate and pulse width；The optical fiber grating sensing link is for modulated pulse trains
Carry out reflex and export transducing signal light, wherein, the modulated pulse trains positioned at different wave length will be by different operating wavelength
Fiber grating reflected, and the modulated pulse trains of phase co-wavelength by identical operation wavelength fiber grating reflect simultaneously,
The different reflection moment will be determined by correspondence fiber grating diverse location；The demodulating equipment is for entering to the transducing signal light
Row demodulation simultaneously obtains heat transfer agent variable quantity and passes sensitivity changes position.
Further, the optical fiber grating sensing link includes：Optical circulator, light wavelength division multiplexing, n optical delay line
With the optical fiber optical grating array being made up of n fiber grating；The input of the optical circulator is used as the optical fiber grating sensing chain
The input on road, the output end of the output end of the optical circulator as the optical fiber grating sensing link；The smooth wavelength-division is multiple
The input/output terminal of the optical circulator is connected to the first input/output terminal of device；The light wavelength division multiplexing has n the
Two input/output terminals, each second input/output terminal pass through an optical delay line and a fiber grating connection；N be more than
Positive integer equal to 2；The optical circulator is for receiving the multi-wavelength light for modulating the transducing signal light for exporting return；It is described
Light wavelength division multiplexing is detected for multi-Wavelength Pulses light according to being grouped two-by-two, to be had respectively entered different sensing branch roads；Institute
Optical delay line is stated for by introducing different time delays so that when the return pulse of different branch occurs in different in demodulation
In the range of quarter, so as to play a part of the different sensing branch roads of Division identification；The optical fiber optical grating array is used to provide quasi-distributed
Heat transfer agent.
Further, there is identical reflection wavelength per fiber grating string all the way in the optical fiber optical grating array, and not
Differ with the reflection wavelength of fiber grating string on sensing branch road.
Further, on different sensing branch roads, the reflection wavelength of fiber grating string is set to the incident sensing branch road
Between two signal light wavelengths.
Further, on different sensing branch roads, the reflection wavelength of fiber grating string is set in the middle of two neighboring wavelength
Place.
Further, during work, modulated pulse trains are incided in light wavelength division multiplexing Jing after circulator, wavelength-division multiplex
Device is distributed two-by-two according to the wavelength of incident light so that enter into have on each branch road in optical fiber optical grating array two it is adjacent
The impulse modulation light of wavelength, and two on every branch road adjacent wavelength pulses modulate light by the light delay through different delay amount
Line, incident light after optical fiber optical grating array reflection again by light wavelength division multiplexing and optical circulator after export transducing signal
Light.
Further, half of the n for the wavelength number of light source.
Further, the demodulating equipment includes：It is connected to the output end of the optical fiber grating sensing link in turn
Photodetector, data collecting card and data processing unit；The photodetector is used to receive the transducing signal light and incite somebody to action
Which is converted to electric signal；The data collecting card is used to gather the electric signal；The data processing unit is for electric signal
The amount of delay of each pulse is obtained after being processed.
By pulsed light time of return determining sensing grating unit position in the present invention such that it is able to cover compared with
Fast and accurately determine the actual correspondence position that sensed parameter changes on a large scale in sensor monitoring region.By adjacent
At the two of wavelength, pulsed light carries out intensity Difference Calculation, can obtain the wavelength shift of the reflecting grating unit.The present invention is adopted
Use multi-wavelength modulation technology, using the pulsed light being modulated on multi-wavelength as transducing signal light, contrast tradition frequently with it is spontaneous
Radiation broad spectrum light source, with higher power spectral density, thus when receiving with higher signal to noise ratio.In addition in different biographies
It is long using two different adjacent waves on sense branch road, different sensing branch road reflected lights can be carried out parallel by wavelength-division multiplex technique
Process, such that it is able to avoid space switch operating mode, improve the speed of sensing and demodulating.As signal to noise ratio increases so that sensing
Distance can extend, then with reference to time-division multiplex technology so that the sensing unit numbers that can access on same branch road can be obtained
To further increasing, so as to increase the solution capacitance-adjustable of whole grating sensing array.
Description of the drawings
Fig. 1 is the optical fiber optical grating array sensing and demodulating system based on multi-Wavelength Pulses differential modulation provided in an embodiment of the present invention
System structural representation.
Wherein, 1 is multiple wavelength laser light source, and 2 is electrooptic modulator, and 3 is optical circulator, and 4 is light wavelength division multiplexing, and 5 are
Optical delay line, 6 is optical fiber optical grating array, and 7 is photodetector, and 8 is data collecting card, and 9 is data processing unit.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, it is below in conjunction with drawings and Examples, right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, and
It is not used in the restriction present invention.
What the present invention was provided can be applied based on the optical fiber optical grating array sensing demodulating system of multi-Wavelength Pulses differential modulation
In fields such as engineering structure health monitoring, environmental index monitoring and protecting, exploration of ocean resources exploitations.The optical fiber light that the present invention is provided
Grid array sensing demodulating system is a kind of Large Copacity, high s/n ratio, quick quasi-distributed optical fiber sensing and demodulating scheme, Neng Gouke
Take solve in traditional Fibre Optical Sensor demodulation scheme capacitance-adjustable is little, demodulation speed is slow and demodulation required signal-to-noise ratio is high deficiency it
Place.
In the present invention, the multi-Wavelength Pulses modulation light of Fibre Optical Sensor demodulation scheme is adjusted from photoelectricity with multiple wavelength laser light source
Device processed is produced jointly.Multiple wavelength laser light source 1 is used to produce the arrowband multi-wavelength light with 0.4nm-2nm wavelength intervals.Photoelectricity
Modulator 2 for by multi-wavelength continuous light modulation into 0.4nm-2nm repetition rates and pulse width light pulse sequence.
Optical fiber grating sensing chain route optical circulator 3, light wavelength division multiplexing 4, optical delay line 5,6 groups of optical fiber optical grating array
Into.The effect of optical circulator 3 is that the multi-wavelength light that will be modulated is delivered to optical fiber grating sensing link, and will be returned from link
Transducing signal light be delivered to demodulating equipment.The effect of light wavelength division multiplexing 4 is, according to being grouped two-by-two, to divide multi-Wavelength Pulses light
Do not enter into different sensing branch roads to be detected.The effect of optical delay line 5 is by introducing different time delays so that in demodulation
In the range of the return pulse of different branch occurs in the different moment, so as to play a part of the different sensing branch roads of Division identification.
Optical fiber optical grating array 6 is primarily as sensing unit, there is provided quasi-distributed heat transfer agent.Per optical fiber all the way in optical fiber optical grating array
Grating string has identical reflection wavelength, and reflectivity is relatively low, such that it is able to reduce the multipath crosstalk effect between grating.No
With fiber grating string on sensing branch road reflection wavelength and differ, the wavelength can be typically designed in the incident sensing branch road
Between two signal light wavelengths.As a preferred embodiment of the present invention, it is the wavelength to be selected in two neighboring wavelength
Between locate, so can ensure that sensing parameter be not changed in the case of, it is adjacent two return pulse intensity differences be divided into 1, so as to more
Normalization must be played a part of well to demarcate.
Demodulating equipment is made up of photodetector 7, data collecting card 8 and data processing unit 9.Photodetector 7 is acted on
It is that the transducing signal light of return is changed into into electric signal.The effect of data collecting card 8 is that the analog electrical signal being converted into is changed into
Digital data signal.The effect of data processing unit 9 is that the digital data signal that will be obtained is analyzed by data algorithm, extracts and passes
The change information of the positional information and sensing parameter of photosensitive grid.
The present invention as transducing signal light, is contrasted traditional broad spectrum light source and is had more using the pulsed light of multi-wavelength modulation
Different sensing branch road reflected lights can be carried out parallel processing, not only can increase sensing unit interstitial content by high signal to noise ratio,
Increase sensing coverage, while also improving the speed of demodulation；Meanwhile, can be determining sensing by pulsed light time of return
Raster unit position such that it is able to sensed ginseng must be quick and precisely determined in large range of sensor monitoring region is covered
The actual correspondence position that amount changes；Intensity Difference Calculation is carried out by pulsed light at the two of adjacent wavelength also in addition, can be with
Obtain the wavelength shift of the reflecting grating unit.
The demodulation method of the present invention is realizing quasi-distributed biography using the time delay and intensity of multi-wavelength modulation light pulse
Sense demodulation.General principle is explained as follows：The optical signal that multiple wavelength laser light source is produced has multiple arrowbands of certain wavelength interval
Optical wavelength.Which obtains the pulsed light sequence of the certain repetition rate on different wave length and pulse width after electrooptic modulator modulation
Row.By light wavelength division multiplexing by multi-Wavelength Pulses light according to being grouped two-by-two, have respectively entered different sensing branch roads and detected.Its
The middle flashlights for entering different sensing branch roads by by the optical delay line of different length, so as to introduce specific delay volume, so as to
The return signal of different sensing branch roads is distinguished when detection is received.Optical fiber optical grating array is primarily as sensing unit, there is provided accurate
Distributed sensing information.Flashlight Jing light wavelength division multiplexings and the light again for carrying heat transfer agent is reflected through optical fiber optical grating array
After circulator, enter into photodetector and complete opto-electronic conversion.The analog electrical signal for obtaining is changed into by data collecting card then
Digital data signal, completes corresponding data algorithm analysis by data processing unit, therefrom extracts the position letter of sensing grating
The change information of breath and sensing parameter.
In the demodulation scheme, the demodulated signal of each sensing branch road is made up of the pulse train of two adjacent wavelength.It is different
Wavelength used by the demodulation of branch road is simultaneously differed, such that it is able to solve the cross-interference issue of demodulated signal between different branch so that different
Branch road is demodulated simultaneously and is possibly realized.For the different gratings of same sensing branch road, by the number similar to time-domain reflectomer
According to process, from returning time delay of the pulsion phase for the incident reference moment judging the positional information of different gratings, the position numerical value
On the speed that light is propagated in a fiber is multiplied by by the half of the amount of delay obtained by；And grating itself changes band due to environment parameter
The wave length shift information come then can be obtained by the intensity differential variation for being located at adjacent pulse at two different wave lengths respectively.
In general, on single branch road, the reflection wavelength of grating operation is respectively positioned between two neighboring incident wavelength；N bars
Road, half of the n for the wavelength number of light source.Based on the demodulation principle, it should be pointed out that the wavelength number of multi wave length illuminating source,
The power level and optical grating reflection rate size of pulse train will determine the capacity of the sensor-based system.Multi-wavelength number will determine institute
The sensing number of branches that can be accessed；And under optical grating reflection rate permanence condition, pulse strength is stronger, then can access on single spur track
Raster count is more；Equally when optical grating reflection rate is less, under identical incident pulse intensity, the grating that can access on single spur track
Number is more.The capacity of whole sensor-based system is multiplied by the most raster counts can access on single spur track by system sensing number of branches
Determined.And adjacent incident two wavelength interval will determine sensitivity and the grating wavelength drift dynamic range of demodulation；The wavelength
Interval selects narrower, it will improve demodulation sensitivity, but dynamic range can diminish；The wavelength interval selects wider in the same manner, then
Dynamic range can become big, and demodulation sensitivity can be reduced.Therefore the selection of the wavelength interval is needed in demodulation sensitivity and dynamic
Balance is found between scope.
It is an advantage of the invention that proposing a kind of Large Copacity modulated based on multi wave length illuminating source, high s/n ratio, quick first
Quasi-distributed optical fiber sensing and demodulating scheme.The program passes through wavelength-division multiplex and time division multiplex largely to grating sensing system
System carries out dilatation；While by two pulse power intensity on the adjacent wavelength of detection and carrying out difference processing so as to extract light lattice wave
Long drift information so that parallel demodulation is possibly realized sensing multichannel simultaneously, it will significant increase Demodulation Systems speed.In addition, adopting
The function of high s/n ratio is had concurrently with multi wave length illuminating source, the reliability and coverage of sensor-based system can be lifted.
Traditional optical fiber optical grating array demodulation mode due to adopting broad spectrum light source more so that different sensing branch road incident lights
Cannot be distinguished by, it usually needs space optical path switching is carried out by the way of photoswitch to realize to different sensing branch roads.And this
Invent and light source is sensed using multi-wavelength, and in Wavelength Assignment use different two adjacent in strict accordance with different sensing branch roads
The mode of incident wavelength is carrying out the process of heat transfer agent, so that the concurrent working simultaneously of each bar branch road is possibly realized.
As shown in figure 1, multi-Wavelength Pulses modulation light is provided by multiple wavelength laser light source 1 and electrooptic modulator 2 in this example.Its
In, multiple wavelength laser light source 1 produces the continuous light of multi-wavelength；The continuous light of multi-wavelength produced by electrooptic modulator 2 pairs enters in time domain
Row intensity modulated, obtains the modulated pulse trains of certain repetition rate and pulse width.The output multi-Wavelength Pulses modulate light light
Incide Jing after circulator 3 in light wavelength division multiplexing 4.Wavelength division multiplexer 4 is distributed two-by-two according to the wavelength of incident light so that
Entering into has the impulse modulation light of two adjacent wavelength on each branch road in optical fiber optical grating array 6.And on every branch road
Two adjacent wavelength pulses modulate light by the optical delay line 5 through different delay amount.Incident light is through the light as sensing unit
Again by light wavelength division multiplexing 4 and optical circulator 3 after the reflection of fine grating array 6, electricity is received and converted to by photodetector 7
Signal.Data signal is converted into through data collecting card 8 again afterwards, calculating is analyzed in data processing unit 9.
Data processing unit 9 mainly stores the time and intensity information for receiving pulse, and it is initial to compare electrooptic modulator 2
Triggering moment processes the amount of delay for obtaining each pulse to calculate.Its concrete handling process is as follows：Compareed in different branch first
The different delayed time amount introduced by fiber delay line 5, determines the heat transfer agent for processing according to the time delay of different trains of pulse
Actually from any bar branch road.Secondly, in same set train of pulse, the time delay according to residing for two adjacent trains of pulse is entering one
Step determines the heat transfer agent for processing comes from which sensing unit of same branch road actually.Finally according to two adjacent arteries and veins
Intensity differential variation between punching string, and then can be according to the physics of sensed parameter extracting the wavelength shift of the sensing unit
Variation characteristic obtains the variable quantity of sensed parameter to analyze.
The present invention as transducing signal light, is contrasted traditional broad spectrum light source and is had more using the pulsed light of multi-wavelength modulation
Different sensing branch road reflected lights can be carried out parallel processing, not only can increase sensing unit interstitial content by high signal to noise ratio,
Increase sensing coverage, while also improving the speed of demodulation.Can be determining sensing grating by pulsed light time of return
Unit position.And pulsed light carries out intensity Difference Calculation at two by adjacent wavelength, the reflecting grating list can be obtained
The wavelength shift of unit.
It should be noted last that, above specific embodiment only to illustrate technical scheme and unrestricted,
Although being described in detail to the present invention with reference to preferred embodiment, it will be understood by those within the art that, can be right
Technical scheme is modified or equivalent, and without deviating from the spirit and scope of technical solution of the present invention, which is equal
Should cover in the middle of scope of the presently claimed invention.
Claims (8)
1. a kind of optical fiber optical grating array sensing demodulating system based on multi-Wavelength Pulses differential modulation, it is characterised in that include：It is many
Wavelength laser source (1), electrooptic modulator (2), optical fiber grating sensing link and demodulating equipment；
The input of the electrooptic modulator (2) is connected to the output end of multiple wavelength laser light source (1), the optical fiber grating sensing
The input of link is connected to the output end of the electrooptic modulator (2), the output end connection of the optical fiber grating sensing link
The demodulating equipment；
The multiple wavelength laser light source (1) is for producing the continuous light of multi-wavelength；
The electrooptic modulator (2) necessarily repeat frequency for obtaining after time domain carries out intensity modulated to the continuous light of the multi-wavelength
The modulated pulse trains of rate and pulse width；
The optical fiber grating sensing link for carrying out reflex to modulated pulse trains and exporting transducing signal light, wherein,
Modulated pulse trains positioned at different wave length will be reflected by the fiber grating of different operating wavelength, and the modulation arteries and veins of phase co-wavelength
Rush sequence reflect in the fiber grating by identical operation wavelength while, the different reflection moment will be by correspondence fiber grating diverse location
Determined；
The demodulating equipment for the transducing signal light is demodulated and is obtained heat transfer agent variable quantity and sensing quantitative change
Change position.
2. optical fiber optical grating array sensing demodulating system as claimed in claim 1, it is characterised in that the optical fiber grating sensing chain
Road includes：Optical circulator (3), light wavelength division multiplexing (4), n optical delay line and the fiber grating battle array being made up of n fiber grating
Row (6)；
Input of the input of the optical circulator (3) as the optical fiber grating sensing link, the optical circulator (3)
Output end of the output end as the optical fiber grating sensing link；
First input/output terminal of the light wavelength division multiplexing (4) is connected to the input/output terminal of the optical circulator (3)；It is described
Light wavelength division multiplexing (4) with n the second input/output terminals, each second input/output terminal by an optical delay line and
One fiber grating connection；N is the positive integer more than or equal to 2；
The optical circulator (3) is for receiving the multi-wavelength light for modulating the transducing signal light for exporting return；
The light wavelength division multiplexing (4) senses branch roads for multi-Wavelength Pulses light according to being grouped two-by-two, to be had respectively entered difference
Detected；
The optical delay line is used for by introducing different time delays so that the return pulse of different branch in demodulation is occurred in not
In the range of the same moment, so as to play a part of the different sensing branch roads of Division identification；
The optical fiber optical grating array is used to provide quasi-distributed heat transfer agent.
3. optical fiber optical grating array sensing demodulating system as claimed in claim 2, it is characterised in that in the optical fiber optical grating array
There is the reflection wavelength of fiber grating string on identical reflection wavelength, and different sensing branch roads not phase per fiber grating string all the way
Together.
4. optical fiber optical grating array sensing demodulating system as claimed in claim 3, it is characterised in that optical fiber on different sensing branch roads
The reflection wavelength of grating string is set between two signal light wavelengths of the incident sensing branch road.
5. optical fiber optical grating array sensing demodulating system as claimed in claim 4, it is characterised in that optical fiber on different sensing branch roads
The reflection wavelength of grating string is set to two neighboring wavelength middle.
6. optical fiber optical grating array sensing demodulating system as claimed in claim 2, it is characterised in that during work, modulates pulse sequence
Row are incided in light wavelength division multiplexing (4) Jing after circulator (3), and wavelength division multiplexer (4) is carried out two-by-two according to the wavelength of incident light
Distribution so that entering into has the impulse modulation light of two adjacent wavelength on each branch road in optical fiber optical grating array (6), and per bar
Two adjacent wavelength pulses on branch road modulate light by the optical delay line (5) through different delay amount, and incident light is through optical fiber light
Transducing signal light is exported afterwards again by light wavelength division multiplexing (4) and optical circulator (3) after grid array (6) reflection.
7. optical fiber optical grating array sensing demodulating system as claimed in claim 2, it is characterised in that wavelength of the n for light source
The half of number.
8. the optical fiber optical grating array sensing demodulating system as described in any one of claim 1-6, it is characterised in that the demodulation dress
Put including：Be connected in turn the photodetector (7) of the output end of the optical fiber grating sensing link, data collecting card (8) and
Data processing unit (9)；
The photodetector (7) is for receiving the transducing signal light and be converted into electric signal；
The data collecting card (8) is for gathering the electric signal；
The data processing unit (9) is for obtaining the amount of delay of each pulse after processing to electric signal.
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