CN107270951B - Multiplexing phase shift optical fiber grating sensing system - Google Patents
Multiplexing phase shift optical fiber grating sensing system Download PDFInfo
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- CN107270951B CN107270951B CN201710595801.0A CN201710595801A CN107270951B CN 107270951 B CN107270951 B CN 107270951B CN 201710595801 A CN201710595801 A CN 201710595801A CN 107270951 B CN107270951 B CN 107270951B
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- 230000010363 phase shift Effects 0.000 title claims abstract description 49
- 239000013307 optical fiber Substances 0.000 title description 2
- 239000000835 fiber Substances 0.000 claims abstract description 78
- 230000003287 optical effect Effects 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 4
- 230000035945 sensitivity Effects 0.000 claims description 2
- 238000001228 spectrum Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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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
-
- 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
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
Abstract
The invention relates to a multiplexing phase shift fiber grating sensing system; the method comprises the following steps: enabling the output wavelength of the multi-wavelength narrow linewidth laser to fall on the edge of a phase shift peak of the phase shift fiber bragg grating; light output by the multi-wavelength narrow linewidth laser is divided into two parts after passing through the coupler, and one part of the light enters the sensing phase shift fiber grating group through the No. 1 circulator; the other part enters the reference phase shift fiber grating group through the circulator; the optical signal reflected from the sensing phase shift fiber grating group enters the 1 st array waveguide grating after passing through the 1 st circulator; and the optical signal reflected from the reference phase-shifting fiber grating group enters the 2 nd array waveguide grating after passing through the 2 nd circulator. The 1 st array waveguide grating and the 2 nd array waveguide grating respectively separate optical signals with different wavelengths and input the optical signals with corresponding wavelengths into a balanced receiver; and acquiring and processing signals from the balanced receivers to acquire outside temperature or strain information. The invention has the advantages that: the system is generally only used for detecting weak ultrasonic signals, and the change of the external temperature or strain is not large.
Description
Technical Field
The invention relates to a grating sensing system, in particular to a multiplexing phase-shift fiber grating sensing system.
Background
The invention relates to a multiplexing phase-shifting fiber grating sensing system designed aiming at the multiplexing problem in phase-shifting fiber grating sensing.
When the external temperature or strain changes, the reflection peak of the phase-shifting fiber grating will move. If the wavelength of a narrow linewidth laser is tuned to the edge of the phase shifted fiber grating reflection peak, a change in the ambient temperature or strain will result in a change in the reflected light power. The ambient temperature or strain can be obtained by detecting the change in power of the reflected optical signal. Compared with the traditional fiber grating sensing, the phase-shifting fiber grating has a steeper reflection peak, so that the sensitivity of the phase-shifting fiber grating sensing system is higher.
In many sensing fields, such as fiber optic hydrophones, multi-point measurements are often required, and thus there is a pressing need for multiplexed sensing systems.
Based on the method, the invention provides a multiplexing phase-shift fiber grating sensing system based on a multi-wavelength narrow linewidth laser.
Disclosure of Invention
The invention adopts a multi-wavelength narrow linewidth laser, and the output wavelengths of the laser are respectively positioned on the edges of the transmission peaks of different phase shift fiber gratings. And a plurality of reference phase-shift fiber gratings are adopted at a receiving end. The reference phase-shift fiber gratings are respectively paired with the sensing phase-shift fiber gratings one by one, and the paired phase-shift fiber gratings have the same performance. The reference phase shift fiber grating is used for eliminating frequency noise and intensity noise of the multi-wavelength narrow linewidth laser so as to accurately obtain the power of a reflected light signal of the sensing phase shift fiber grating. In order to extract the power of the reflected optical signal of each phase-shifting fiber grating, an arrayed waveguide grating is adopted. Meanwhile, by designing a light path, the 2 nd arrayed waveguide grating is used for transmitting a reflected light signal of the reference phase-shift fiber grating, and the 1 st arrayed waveguide grating is used for transmitting a reflected light signal of the sensing phase-shift fiber grating. The pair of wavelengths is then input to a balanced receiver.
In order to realize the purpose, the invention adopts the following steps to build a multiplex phase-shift fiber grating sensing system; a multiplexed phase shifted fiber grating sensing system; the method is characterized by comprising the following steps:
(1) the output wavelength of the multi-wavelength narrow linewidth laser falls on the edge of the phase shift peak of the phase shift fiber grating, as shown in fig. 3;
(2) light output by the multi-wavelength narrow linewidth laser is divided into two parts after passing through the coupler, and one part of the light enters the sensing phase shift fiber grating group through the No. 1 circulator; the other part enters the reference phase shift fiber grating group through the 2 nd circulator;
(3) the optical signal reflected from the sensing phase shift fiber grating group enters the 1 st array waveguide grating after passing through the 1 st circulator; and the optical signal reflected from the reference phase-shifting fiber grating group enters the 2 nd array waveguide grating after passing through the 2 nd circulator.
(4) The 1 st array waveguide grating and the 2 nd array waveguide grating respectively separate optical signals with different wavelengths and input the optical signals with corresponding wavelengths into a balanced receiver;
(5) and acquiring and processing signals from the balanced receivers to acquire outside temperature or strain information.
The invention has the advantages that: the system is generally only used for detecting weak ultrasonic signals, and the change of the external temperature or strain is not large. However, if the external temperature or strain changes greatly and causes the reflection peak of the sensing phase-shifted fiber grating to move greatly, the output wavelength of the multi-wavelength narrow linewidth laser may not fall on the reflection peak of the sensing phase-shifted fiber grating, thereby causing the system to fail. Feedback is added to adjust the output wavelength of the narrow linewidth laser and the reflection spectrum of the reference phase-shifted fiber grating.
Drawings
FIG. 1 is a block diagram of a multiplexed phase-shifted fiber grating sensing system.
FIG. 2 shows the reflection spectrum of a sensing phase-shifted fiber grating (the reflection spectrum of a reference phase-shifted fiber grating is identical to that of a sensing phase-shifted fiber grating), and the concave part in the middle of the reflection spectrum is the phase-shifted peak of the phase-shifted fiber grating.
Fig. 3 is a relationship between the output wavelength of a narrow linewidth laser and the reflection spectrum of a phase-shifted fiber grating set. As can be seen from fig. 3, in operation, the multi-wavelength optical signals output by the narrow linewidth laser are respectively located at the edges of the phase shift peaks of the sensing phase shift fiber grating group.
Detailed Description
An embodiment is shown in figure 1. The wavelength of an output optical signal of the multi-wavelength narrow linewidth laser is tuned to the phase shift peak edge of the sensing phase shift fiber grating group, and the reference phase shift fiber grating group and the sensing phase shift fiber grating group are identical. The output optical signal of the multi-wavelength narrow linewidth laser is divided into two parts after passing through the coupler. Part of light enters the sensing phase shift fiber grating group after passing through the 1 st circulator, and an optical signal reflected by the sensing phase shift fiber grating group enters the 1 st arrayed waveguide grating through the 1 st circulator; and the other part of light enters the reference phase-shifting fiber grating group after passing through the 2 nd circulator, and the optical signal reflected by the reference phase-shifting fiber grating group enters the 2 nd array waveguide grating through the 2 nd circulator. The light with the same wavelength from the 1 st array waveguide grating and the 2 nd array waveguide grating enters the same balance receiver, finally enters the multichannel data acquisition equipment for acquisition and processing, and the temperature or the strain of the sensing phase shift fiber grating is inverted.
A multiplexed phase-shifted fiber grating sensing system. It is characterized in that
1. The sensing phase-shifting fiber grating group and the reference phase-shifting fiber grating group are adopted, and the performance of any phase-shifting fiber grating in the sensing phase-shifting fiber grating group is completely consistent with that of one phase-shifting fiber grating in the reference phase-shifting fiber grating group.
2. Two groups of arrayed waveguide gratings are adopted to output optical signals with different wavelengths reflected by a reference phase-shift fiber grating group and a sensing phase-shift fiber grating group from different ports, and then the optical signals with the same wavelength output by the two arrayed waveguide gratings are input into the same balanced receiver.
3. The multi-wavelength narrow linewidth laser is adopted, and multi-wavelength optical signals output by the multi-wavelength narrow linewidth laser are respectively positioned at the edges of phase shift peaks of the phase shift fiber gratings.
Claims (1)
1. A multiplexed phase-shifted fiber grating sensing system: the method is characterized by comprising the following steps:
(1) the output wavelength of the multi-wavelength narrow linewidth laser falls on the edge of a phase shift peak of the phase shift fiber grating, and compared with the traditional fiber grating sensing, the phase shift fiber grating has a steeper reflection peak; therefore, compared with a fiber grating sensing system, the sensitivity is higher;
(2) light output by the multi-wavelength narrow linewidth laser is divided into two parts through the coupler, and one part of the light enters the sensing phase shift fiber grating group through the No. 1 circulator; the other part enters the reference phase shift fiber grating group through the 2 nd circulator; the performance of any phase-shifting fiber grating in the sensing phase-shifting fiber grating group is completely consistent with that of one phase-shifting fiber grating in the reference phase-shifting fiber grating group; the reference phase-shift fiber grating is used for eliminating frequency noise and intensity noise of the multi-wavelength narrow linewidth laser so as to accurately obtain the power of a reflected light signal of the sensor phase-shift fiber grating;
(3) the optical signal reflected from the sensing phase shift fiber grating group enters the 1 st array waveguide grating after passing through the 1 st circulator; the optical signal reflected from the reference phase shift fiber grating group enters the 2 nd array waveguide grating after passing through the 2 nd circulator;
(4) the 1 st array waveguide grating and the 2 nd array waveguide grating respectively separate optical signals with different wavelengths and input the optical signals with corresponding wavelengths into a balanced receiver; two groups of arrayed waveguide gratings are adopted to output optical signals with different wavelengths reflected by a reference phase-shift fiber grating group and a sensing phase-shift fiber grating group from different ports, and then the optical signals with the same wavelength output by the two arrayed waveguide gratings are input into the same balanced receiver;
(5) and acquiring and processing signals from the balanced receivers to acquire outside temperature or strain information.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102589586A (en) * | 2012-01-17 | 2012-07-18 | 北京奥飞搏世技术服务有限公司 | Synchronous multi-channel fiber grating sensing and demodulating system |
| CN103095373A (en) * | 2013-01-31 | 2013-05-08 | 华中科技大学 | Self-correlation optical fiber communication system based on mode division multiplexing |
| CN105352446A (en) * | 2015-11-30 | 2016-02-24 | 上海交通大学 | Sub-nano strain level multi-point multiplexing fiber grating quasi static strain sensor system |
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| US7277617B2 (en) * | 2003-05-07 | 2007-10-02 | Intel Corporation | Optical pulse compressor based on integrated planar lightwave circuit: method, device, and systems |
| JP2010102294A (en) * | 2008-09-26 | 2010-05-06 | Taizo Nosaka | Diffraction grating for receiving differential phase shift modulation light, and light receiving device using the same |
| CN201476800U (en) * | 2009-05-08 | 2010-05-19 | 刘信 | High-speed multi-channel fiber grating sensor demodulating system based on AWG |
| CN103196473B (en) * | 2013-03-26 | 2015-10-28 | 天津大学 | Multi-channel high-accuracy fiber grating sensing demodulation device and demodulation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102589586A (en) * | 2012-01-17 | 2012-07-18 | 北京奥飞搏世技术服务有限公司 | Synchronous multi-channel fiber grating sensing and demodulating system |
| CN103095373A (en) * | 2013-01-31 | 2013-05-08 | 华中科技大学 | Self-correlation optical fiber communication system based on mode division multiplexing |
| CN105352446A (en) * | 2015-11-30 | 2016-02-24 | 上海交通大学 | Sub-nano strain level multi-point multiplexing fiber grating quasi static strain sensor system |
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