CN105628065B - A kind of fiber grating signal demodulating equipment and demodulation method - Google Patents
A kind of fiber grating signal demodulating equipment and demodulation method Download PDFInfo
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- 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
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- 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
- G01D5/35338—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 other arrangements than interferometer arrangements
- G01D5/35354—Sensor working in reflection
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- 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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- 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
A kind of fiber grating signal demodulating equipment, including optical fiber fluorescence light source, narrow band filter, image intensifer, edge filter, photoswitch, 1 × N fiber couplers and N number of optical fiber grating sensing module；The output end of the optical fiber fluorescence light source and the input of narrow band filter connect, the output end of narrow band filter and the input of image intensifer connect, the output end of image intensifer and the input of edge filter connect, two output ends of edge filter and two inputs of photoswitch connect, the output end of photoswitch is connected with the input of 1 × N fiber couplers, and N number of output end of 1 × N fiber couplers connects N number of optical fiber grating sensing module respectively.The design significantly reduces demodulating system cost compared with existing Commercial fibers grating demodulation instrument；Using the method amplified after first narrow-band filtering, the energy utilization efficiency of pump laser is improved；Utilize two symmetrical characteristics of output of boundary filter, the measurement accuracy of raising optical fiber grating sensing module.
Description
Technical field
The invention is related to a kind of fiber grating signal demodulating equipment and demodulation method, belongs to fiber optic sensor technology neck
Domain.
Background technology
Fiber-optic grating sensor has in light weight, corrosion-resistant, electromagnetism interference, and chemical stability is high, the big system of grade one of capacity
The advantages of row, and fiber-optic grating sensor is easy to and fiber coupling, forms sensing, the integrated network system of communicating integral,
Therefore by the extensive concern of industry.Fiber grating sensing technology passes through the development of nearly 30 years, and its technology has reached its maturity, and passes
The cost of sensor gradually reduces, and the physical quantity that it is detected extends to flow, acceleration, liquid level also by initial temperature and strain
Etc. a variety of physical quantitys, application field also from industries such as traditional bridge, electric power, extends to each department of national economy.
The mechanism of optical fiber grating sensing is that the change of the temperature of external environment or strain is converted into its reflectance spectrum center
The drift of wavelength.Generally, 1 DEG C of temperature change, wherein heart wavelength shift are only 10 pm or so.Therefore, it is how smart
The change for really detecting its reflectance spectrum centre wavelength is the key of fiber grating sensor system demodulation technology.At present, comparative maturity
Method be to use the Wavelength demodulation method based on frequency-sweeping laser source.By frequency swept laser scanning fiber bragg grating so as to drawing
Go out its reflectance spectrum, and then calculate its centre wavelength.This method technology maturation, demodulation accuracy is high, can integrate a large amount of light simultaneously
Fiber grating sensor.But in numerous actual engineer applieds, its scale is smaller, required fiber-optic grating sensor quantity is often
Only more than ten or tens.And traditional frequency swept laser price is very high, therefore the cost of whole sensor-based system is higher, sternly
The application and development of fiber grating sensing technology are limited again.So how low cost detect fiber grating reflectance spectrum
The drift value of centre wavelength is the developing direction of fiber grating sensing technology.
The content of the invention
For the demand, the present invention proposes a kind of based on the fiber grating of passive edge filter and fluorescence light source letter
Number demodulating equipment, its cost is cheap, and effective compensation light source output power shakes the influence to precision.It can meet numerous
In, the demand of small-scale fiber grating sensing system.
To achieve the above object, the invention is realized by following technological means：
A kind of fiber grating signal demodulating equipment, it is characterised in that：Put including optical fiber fluorescence light source, narrow band filter, light
Big device, edge filter, photoswitch, 1 × N fiber couplers and N number of optical fiber grating sensing module；The optical fiber fluorescence light source
The input of output end and narrow band filter is connected, and the output end of narrow band filter and the input of image intensifer are connected, and light is put
The output end of big device and the input of edge filter connect, two output ends of edge filter and two inputs of photoswitch
End connection, the output end of photoswitch are connected with the input of 1 × N fiber couplers, N number of output end point of 1 × N fiber couplers
N number of optical fiber grating sensing module is not connected.
Further：
Described optical fiber fluorescence light source includes the first pump laser, the first Er-doped fiber, the first wavelength division multiplexer, first
Isolator；The first described wavelength division multiplexer is connected with the first pump laser, the first Er-doped fiber and the first isolator respectively,
Fluorescence is sent out by the output end of the first isolator.
Described image intensifer includes the second pump laser, the second Er-doped fiber, the second wavelength division multiplexer, the second isolation
Device；The second described wavelength division multiplexer connects with the output end of the second pump laser and the input of the second Er-doped fiber respectively
Connect, the output end of the second Er-doped fiber is connected with the input of the second isolator, and the optical signal after amplification passes through the second isolator
Output end be sequentially output to edge filter, photoswitch and 1 × N fiber couplers.
Described optical fiber grating sensing module includes 1 × 2 fiber coupler, fiber-optic grating sensor and Photoelectric Detection；Institute
1 × 2 fiber coupler stated is connected with fiber-optic grating sensor and Photoelectric Detection respectively, and 1 × 2 fiber coupler receives 1 × N light
The optical signal of fine coupler.
A kind of fiber grating signal demodulating method, it is characterised in that：Comprise the following steps：1）Produce narrow band light；2）Symmetrically
Edge characteristics spectrum acquisition；3）Calculate wavelength shift.
Described step 1）Including：
11）Optical fiber fluorescence light source sends broadband optical signal, and narrow band light is produced after narrow band filter；
12）Narrow band light carries out power amplification by image intensifer.
Described step 2）Including：
21）Step 12）Caused narrow band light inputs edge filter；
22）Edge filter exports symmetrical edge characteristics optical signal, and two ways of optical signals is sent into 1 by photoswitch timesharing ×
N fiber couplers, it is divided into N parts.
Described step 3）Including：
31）By step 22）The timesharing of the spectroscopic signal such as N sent inputs N number of optical fiber grating sensing module；
32）Calculate the changed power of fiber grating reflected light；
33）Change the drift value for calculating wavelength according to fiber grating reflected optical power.
The beneficial effect of the invention is：The present invention devises a kind of fluorescence light source with edge spectral characteristic and is used for
The demodulation of fiber-optic grating sensor reflectance spectrum, compared with existing Commercial fibers grating demodulation instrument, significantly reduce demodulating system
Cost；Using the method amplified after first narrow-band filtering, the energy utilization efficiency of pump laser is improved；Utilize boundary filter
Two symmetrical characteristics of output, improve the measurement accuracy of optical fiber grating sensing module.
Brief description of the drawings
Fig. 1 is that the invention forms structural representation, Fig. 2 optical fiber fluorescences light source composition structural representation；Fig. 3 is put for light
Big device composition structural representation；Fig. 4 is that optical fiber grating sensing module forms structural representation；Fig. 5 is fluorescence light source output spectrum
Figure；Fig. 6 narrow band filters export the spectrogram of optical signal；The spectrogram of two output optical signals of Fig. 7 edge filters.
Embodiment
Below in conjunction with Figure of description, the invention is further described.
As shown in Figure 1, fiber grating signal demodulating equipment of the invention includes optical fiber fluorescence light source and optical fiber fluorescence light
The narrow band filter of source output terminal mouth connection, the image intensifer, defeated with image intensifer being connected with the output port of narrow band filter
The edge filter of exit port connection, the photoswitch being connected with edge filter output port, it is connected with photoswitch output port
1 × N fiber couplers and N number of optical fiber grating sensing module for being connected with N number of output port of 1 × N fiber couplers.
As shown in Fig. 2 optical fiber fluorescence light source includes the first wavelength division multiplexer, an input with the first wavelength division multiplexer/
First Er-doped fiber of output port connection, the first pump laser being connected with an input port of the first wavelength division multiplexer
The first isolator being connected with an output port with the first wavelength division multiplexer.
As shown in figure 3, image intensifer include the second wavelength division multiplexer, be connected with the second wavelength division multiplexer input second
Pump laser, the second Er-doped fiber being connected with the second wavelength division multiplexer output end, be connected with the second Er-doped fiber second
Isolator.Another input port of second wavelength division multiplexer and the output port of narrow band filter connect.
As shown in figure 1, the amplification arrowband fluorescence signal of the second isolator output passes through edge filter, symmetrical side is exported
Along the arrowband fluorescence signal of characteristic, after 1 × N fiber couplers are sent into photoswitch timesharing, it is divided into the impartial N deciles of power.
As shown in figure 4, input of the optical fiber grating sensing module including 1 × 2 fiber coupler and 1 × 2 fiber coupler/
The fiber-optic grating sensor of output port connection, the Photoelectric Detection being connected with another output port of 1 × 2 fiber coupler, 1
Another input port of × 2 fiber couplers is connected with an output port of 1 × N fiber couplers.
A kind of fiber grating signal demodulating method, comprises the following steps：
1）The narrow band light that first pump laser is sent is sent into the first Er-doped fiber, narrow band light letter through the first wavelength division multiplexer
The broadband fluorescence signal of backscattering is produced number in the first Er-doped fiber, is answered successively through the first wavelength-division backwards to broadband fluorescence signal
Exported with the output port of device and the first isolator.Output signal spectrum is as shown in Figure 5.
2）The broadband fluorescence signal of first isolator output is changed into arrowband fluorescence signal after narrow band filter, and through narrow
The output port output of band filter.The light that the arrowband fluorescence signal and the second pump laser of narrow band filter output are sent is believed
Number it is output to through the second wavelength division multiplexer in the second Er-doped fiber, the power of arrowband fluorescence signal is put in the second Er-doped fiber
Greatly, and by the output port of the second isolator export.Arrowband fluorescence signal spectrum after amplification is as shown in fig. 6, arrowband fluorescence
Signal spectrum is consistent with the free transmission range of narrow band filter, and spectral power is amplified by image intensifer.
3）The amplification arrowband fluorescence signal of second isolator output exports the spectrum of symmetric signal after edge filter 4
As shown in Figure 7.The signal is divided into the impartial N deciles of power, and pass through after 1 × N fiber couplers are sent into photoswitch timesharing
The output port output of 1 × N fiber couplers.The output optical signal of 1 × N fiber couplers is sent into light after 1 × 2 coupler
Fiber grating sensor.Fiber-optic grating sensor reflecting part optical signal, reflected light are sent into Photoelectric Detection after 1 × 2 coupler,
Optical signal is switched into the directly proportional electric signal of power therewith.
4）When the physical quantity of fiber-optic grating sensor monitoring changes, fiber-optic grating sensor reflection center wavelength of light
It will drift about.Because spectrum as shown in Figure 7 has the characteristic of approximately linear, the drift of fiber grating reflectance spectrum centre wavelength
Shifting will cause its reflected optical power to change, therefore obtain the power of reflected light by Photoelectric Detection, you can calculate its center
The offset of wavelength, meanwhile, the optical signal of photoswitch timesharing output is symmetrical, utilizes the difference divided by two-way light of two ways of optical signals
Signal sum, the error that optical fiber shake etc. is brought can be eliminated, improve measurement accuracy, the final extraneous physics for obtaining amendment error
The changing value of amount.
The general principle, main features and advantages of the invention have been shown and described above.The technical staff of the industry
It should be appreciated that the design is not restricted to the described embodiments, simply explanation the design described in above-described embodiment and specification
Principle, on the premise of the design spirit and scope are not departed from, the invention also has various changes and modifications, these change
Change and improve and both fall within the range of claimed the design.Scope is claimed by appended claims in the invention
And its equivalent thereof.
Claims (6)
- A kind of 1. fiber grating signal demodulating equipment, it is characterised in that：Including optical fiber fluorescence light source, narrow band filter, light amplification Device, edge filter, photoswitch, 1 × N fiber couplers and N number of optical fiber grating sensing module；The optical fiber fluorescence light source it is defeated Go out end to be connected with the input of narrow band filter, the output end of narrow band filter and the input of image intensifer connect, light amplification The output end of device and the input of edge filter connect, two output ends of edge filter and two inputs of photoswitch Connection, the output end of photoswitch are connected with the input of 1 × N fiber couplers, N number of output end difference of 1 × N fiber couplers Connect N number of optical fiber grating sensing module.
- A kind of 2. fiber grating signal demodulating equipment as claimed in claim 1, it is characterised in that：Described optical fiber fluorescence light source Including the first pump laser, the first Er-doped fiber, the first wavelength division multiplexer, the first isolator；The first described wavelength-division multiplex Device is connected with the first pump laser, the first Er-doped fiber and the first isolator respectively, the output that fluorescence passes through the first isolator Send out at end.
- A kind of 3. fiber grating signal demodulating equipment as claimed in claim 1, it is characterised in that：Described image intensifer includes Second pump laser, the second Er-doped fiber, the second wavelength division multiplexer, the second isolator；The second described wavelength division multiplexer point It is not connected with the output end of the second pump laser and the input of the second Er-doped fiber, the output end of the second Er-doped fiber and the The input connection of two isolators, the optical signal after amplification are sequentially output to edge filter demodulation by the output end of the second isolator Device, photoswitch and 1 × N fiber couplers.
- A kind of 4. fiber grating signal demodulating equipment as claimed in claim 1, it is characterised in that：Described optical fiber grating sensing Module includes 1 × 2 fiber coupler, fiber-optic grating sensor and Photoelectric Detection；1 × 2 described fiber coupler respectively with light Fiber grating sensor connects with Photoelectric Detection, and 1 × 2 fiber coupler receives the optical signal of 1 × N fiber couplers.
- A kind of 5. fiber grating signal demodulating method, it is characterised in that：A kind of fiber grating letter as claimed in claim 1 is provided Number demodulating equipment, the described method comprises the following steps：1）Produce narrow band light；2）The acquisition of symmetrical edge characteristics spectrum；3）Meter Calculate wavelength shift；Described step 1）Including：11）Optical fiber fluorescence light source sends broadband optical signal, and narrow band light is produced after narrow band filter；12）Narrow band light carries out power amplification by image intensifer；Described step 2）Including：21）Step 12）Caused narrow band light inputs edge filter；22）Edge filter exports symmetrical edge characteristics optical signal, and two ways of optical signals is sent into 1 × N light by photoswitch timesharing Fine coupler, it is divided into N parts.
- A kind of 6. fiber grating signal demodulating method as claimed in claim 5, it is characterised in that：Described step 3）Including：31）By step 22）The timesharing of the spectroscopic signal such as N sent inputs N number of optical fiber grating sensing module；32）Calculate the changed power of fiber grating reflected light；33）Change the drift value for calculating wavelength according to fiber grating reflected optical power.
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| CN109959944B (en) * | 2019-03-29 | 2023-06-16 | 中国科学技术大学 | Wind lidar based on wide-spectrum light source |
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| DE19754910C2 (en) * | 1997-12-10 | 1999-12-02 | Geoforschungszentrum Potsdam | Wavelength detection on fiber Bragg grating sensors |
| CN100478658C (en) * | 2004-09-21 | 2009-04-15 | 武汉理工大学 | Double edge filter wave length demodulator and its demodulating method |
| DE102009014478B4 (en) * | 2009-03-23 | 2013-07-18 | fos4X GmbH | Device for converting an optical input signal into an electrical output signal and method for producing the device |
| CN103245422A (en) * | 2013-05-14 | 2013-08-14 | 东南大学 | Sensing demodulation system of multi-point distributed optical fiber bragg grating |
| CN103398808B (en) * | 2013-07-25 | 2015-05-13 | 哈尔滨理工大学 | Sensing method of double-sideband filter demodulation-based dual fiber grating tension sensor |
| CN104154935B (en) * | 2014-08-14 | 2016-08-24 | 哈尔滨理工大学 | Raising method based on linear filter FBG demodulating system sensitivity |
| CN104198789B (en) * | 2014-09-11 | 2015-08-05 | 国家电网公司 | A kind of optical fiber current mutual inductor based on magnetostrictive effect |
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