CN110736436A - Phase-shift fiber grating sensing sensitivity stabilizing system and method based on wavelength following - Google Patents
Phase-shift fiber grating sensing sensitivity stabilizing system and method based on wavelength following Download PDFInfo
- Publication number
- CN110736436A CN110736436A CN201910820420.7A CN201910820420A CN110736436A CN 110736436 A CN110736436 A CN 110736436A CN 201910820420 A CN201910820420 A CN 201910820420A CN 110736436 A CN110736436 A CN 110736436A
- Authority
- CN
- China
- Prior art keywords
- phase
- fiber grating
- ultra
- optical
- wavelength
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
- G01B11/165—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by means of a grating deformed by the object
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/04—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness by measuring coordinates of points
- G01B21/045—Correction of measurements
Abstract
The invention discloses phase-shift fiber grating sensing sensitivity stabilizing systems and methods based on wavelength following, which comprise a phase-shift fiber grating (1), a photoelectric balance detector (3), a fiber circulator (4), a tunable narrow linewidth laser (5), a data acquisition card (6) and a control system (7), wherein transmitted light and reflected light of the phase-shift fiber grating (1) are simultaneously input into the photoelectric balance detector (3) to carry out differential amplification of a reflection spectrum and a transmission spectrum, light waves output by the tunable narrow linewidth laser (5) enter the phase-shift fiber grating (1), and the control system (7) is respectively communicated with the data acquisition card (6) and the tunable narrow laser (5).
Description
Technical Field
The invention belongs to the field of optical fiber sensing, and particularly relates to a phase shift fiber grating sensing sensitivity stabilizing system and method.
Background
The phase shift fiber grating is used as novel fiber Bragg gratings, is formed by changing the refractive index distribution of a fiber core of the fiber Bragg grating and introducing determined phase shift amount at a specific position on the basis of a common fiber grating, and because the phase shift is introduced into the phase shift fiber grating, ultra-narrow peaks are respectively generated in a reflection spectrum and a transmission spectrum of the phase shift fiber grating, and the line width of the ultra-narrow peaks is extremely narrow, the resolution of the system can be improved by applying the phase shift fiber grating to an optical fiber sensing system of an edge filter method, and high-precision sensing with higher sensitivity than that of a traditional fiber grating sensor is realized.
technical solutions for solving the cross sensitivity between the temperature and the strain of the phase-shifted fiber grating at degree also exist in the prior art, which mainly includes two major categories, category, where a special package structure or a special package material, such as a cantilever package structure, a metal bridge package structure, is used for the phase-shifted fiber grating, when a change in temperature is applied to the package structure, the acting force of the package structure can compensate for the change in the gate region of the phase-shifted fiber grating, or the gate region is packaged by using a material with a negative thermal expansion coefficient, and when the gate region expands or contracts under the influence of temperature, the volume change of the package material and the change in the gate region have opposite trends, so as to offset the change in the gate region, and category, where two ultra-narrow peaks are used for sensing the temperature at the same time, but only ultra-narrow peaks are used for strain sensing, and the spectrum difference of the two ultra-narrow peaks is used for eliminating the interference of the temperature, so that the strain signal interference can be eliminated, and the strain signal cross sensitivity of the above-strain signal package structure can not be effectively detected in the above-mentioned second technical solution, although the strain-induced strain-grating and strain-.
Disclosure of Invention
In order to make up for the defects of the prior art, the invention provides systems and methods for stabilizing the sensing sensitivity of a phase-shift fiber grating based on wavelength following, which are mainly used for overcoming the problem of cross sensitivity of temperature and strain during high-precision sensing of the phase-shift fiber grating.
The invention relates to an type phase-shift fiber grating sensing sensitivity stabilizing system based on wavelength following, which comprises a phase-shift fiber grating 1, a photoelectric balance detector 3, a fiber circulator 4, a tunable narrow linewidth laser 5, a data acquisition card 6 and a control system 7, wherein the phase-shift fiber grating 1 is respectively provided with a transmission end 101 and a reflection end 102, the photoelectric balance detector 3 is respectively provided with two optical input interfaces and two 301, 302 and optical output interfaces 303 of the optical input interfaces, the fiber circulator 4 is respectively provided with ports to three 401, 402 and 403, the tunable narrow linewidth laser 5 is respectively provided with an optical input end 501 and an optical output end 502, and the data acquisition card 6 is respectively provided with a signal input end 601 and a signal output end 602, wherein:
any optical input interface of the photoelectric balance detector 3 is connected with the transmission end 101, correspondingly, another optical input interface is connected with the third port 403 of the optical fiber circulator 4, the second port 401 of the optical fiber circulator 4 is always connected with the optical input end 501 of the tunable narrow linewidth laser 5, and the second port 402 of the optical fiber circulator 4 is always connected with the reflection end 102;
the transmitted light and the reflected light of the phase-shift fiber grating 1 are simultaneously input into a photoelectric balance detector 3, the difference amplification of the reflection spectrum and the transmission spectrum is carried out in the photoelectric balance detector 3, the light wave output by the tunable narrow linewidth laser 5 enters the phase-shift fiber grating 1 through the fiber circulator 4, and the control system 7 is respectively communicated with the data acquisition card 6 and the tunable narrow linewidth laser 5.
The photoelectric balance detector 3 performs differential amplification on the received transmitted light and reflected light of the phase-shift fiber bragg grating, so that the alternating current signal output by the photoelectric balance detector 3 is multiplied, the noise signal is attenuated, and the input optical signal is converted into an electric signal and then output.
The method for stabilizing the sensitivity of phase-shift fiber grating sensing based on wavelength following is used for stabilizing the sensitivity of the phase-shift fiber grating sensing, and comprises the following specific processes:
, using a tunable narrow linewidth laser to scan and output wavelength, thereby rapidly positioning the position of the ultra-narrow peak in the spectrum of the phase shift fiber grating, and simultaneously, using a control system to extract the direct current signal output by the photoelectric balance detector;
judging whether the direct current signal is zero by using the control system, if the direct current signal is zero, positioning the position of the ultra-narrow peak in the spectrum of the phase-shifting fiber grating, if the direct current signal is not zero, continuing to execute the step , and when the position of the ultra-narrow peak is positioned, the wavelength of light output by the tunable narrow-linewidth laser is positioned at the position where the ultra-narrow peak transmissivity of the phase-shifting fiber grating is 50%, the sensing sensitivity of the phase-shifting fiber grating is highest, and the direct current signal at the output end of the photoelectric balance detector is closer to zero, the higher the sensing sensitivity of the phase-shifting fiber grating is;
step three: after the position of an ultra-narrow peak in a phase-shift fiber grating spectrum is located, the control system immediately stops the wavelength scanning output of the tunable narrow linewidth laser, and simultaneously starts a control stage of light wave following the ultra-narrow peak drift, and the control stage of the light wave following the ultra-narrow peak drift ensures that the light wavelength output by the tunable narrow linewidth laser is always close to the position of the phase-shift fiber grating ultra-narrow peak with the transmittance of 50 percent, namely ensures that the light wavelength output by the tunable narrow linewidth laser always follows the movement of the phase-shift fiber grating ultra-narrow peak;
step four: in the control stage that the light wave follows the ultra-narrow peak drift, a control system monitors whether the direct current signal is in the threshold range of the direct current signal in real time: if the direct current signal is in the threshold range of the direct current signal, continuing to execute a control stage of the optical wave following the ultra-narrow peak drift, and at the moment, considering that the sensing sensitivity of the phase-shifting fiber bragg grating meets the requirement and not tuning the optical wavelength output by the tunable narrow linewidth laser; otherwise, the control system judges whether the duration time of the direct current signal which is not in the direct current signal threshold range exceeds a time judgment value: if the time judgment value is not exceeded, continuing to execute the control stage of the light wave following the ultra-narrow peak drift; otherwise, the control system tunes the optical wavelength output by the tunable narrow linewidth laser until the direct current signal is in the threshold range of the direct current signal again, the optical wavelength output by the tunable narrow linewidth laser approaches the position of the phase-shift fiber grating with the ultra-narrow peak transmissivity of 50% again, and the drift of the ultra-narrow peak is followed again;
step five: and after the control system tunes the optical wavelength output by the tunable narrow linewidth laser, continuously executing a control stage that the optical wavelength follows the ultra-narrow peak drift.
Completely different from the traditional technical solution idea, the invention has the following specific beneficial effects:
1. the invention adopts the photoelectric balance detector, the transmitted light and the reflected light of the phase-shifting fiber grating are simultaneously input into the photoelectric balance detector, and the difference amplification of the reflection spectrum and the transmission spectrum is carried out, so that the alternating current signal output by the photoelectric balance detector is multiplied, the noise signal is attenuated, and the influence of system noise can be reduced while the sensitivity of the phase-shifting fiber grating is enhanced in step ;
2. the invention has simple and ingenious structure, fully utilizes the direct current signal output by the photoelectric balance detector, enables the direct current signal to become a reference signal for tuning the output wavelength of the tunable narrow linewidth laser, forms closed-loop feedback by the whole sensitivity stabilizing system, has better sensitivity stabilizing effect, and can effectively overcome the problem of cross sensitivity of temperature and strain during high-precision sensing of the phase-shift fiber bragg grating.
Drawings
FIG. 1 is a schematic diagram of a system for stabilizing the sensing sensitivity of a phase-shifting fiber grating based on wavelength following according to the present invention;
FIG. 2 is a schematic diagram illustrating the difference between the transmission spectrum and the reflection spectrum of the phase-shifted fiber grating according to the present invention;
FIG. 3 is a schematic diagram illustrating the principle of stable sensing sensitivity after spectral differentiation of the phase-shifted fiber grating according to the present invention;
FIG. 4 is a flow chart of a method for stabilizing the sensing sensitivity of a phase-shifting fiber grating based on wavelength following according to the present invention;
reference numerals:
1. the optical fiber phase-shifting optical fiber grating comprises a phase-shifting optical fiber grating, 2 parts of a low-noise signal line, 3 parts of a photoelectric balance detector, 4 parts of an optical fiber circulator, 5 parts of a tunable narrow-linewidth laser, 6 parts of a data acquisition card, 7 parts of a control system, 101 parts of a transmission end, 102 parts of a reflection end, 301-303 parts of an optical input interface -two parts, 303 parts of an optical output interface, 401-403 parts of a port -three parts, 501 parts of an optical input end, 502 parts of an optical output end, 601 parts of a signal input end, 602 parts of a signal output end.
Detailed Description
The technical solution of the present invention is described in detail below with reference to the accompanying drawings and examples. .
As shown in FIG. 1, the wavelength-following-based phase-shift fiber grating sensing sensitivity stabilization system of the invention comprises a phase-shift fiber grating 1, a low-noise signal line 2, a photoelectric balance detector 3, a fiber circulator 4, a tunable narrow-line-width laser 5, a data acquisition card 6 and a control system 7, wherein the phase-shift fiber grating 1 is connected with an optical input interface of the photoelectric balance detector 3 through a transmission end 101, the optical input interface is used for receiving transmission light of the phase-shift fiber grating 1, a reflection end 102 of the phase-shift fiber grating 1 is connected with a port II 402 of the fiber circulator 4 through an optical fiber, the fiber circulator 4 can transmit reflection light of the phase-shift fiber grating 1 to a port III 403 through the port II 402, the port III 403 of the fiber circulator 4 is connected with an optical input interface II 302 of the photoelectric balance detector 3 through an optical fiber, the optical input interface II 302 is used for receiving reflection light of the phase-shift fiber grating 1, the photoelectric balance detector 3 can perform differential conversion on transmission spectrum and reflection spectrum of the received phase-shift fiber grating 1, convert an input optical signal into a differential signal, the differential signal enters an output end of the tunable narrow-shift fiber grating 1, the tunable fiber circulator 601, the fiber grating 1, the tunable narrow-line-width control signal acquisition card 11 is connected with the fiber grating communication output end of the fiber circulator 3, and the fiber grating 3, and the fiber circulator 3, and the narrow-tunable narrow-line-width control system 7, and the.
As embodiments of the present invention, the transmission end 101 of the phase-shifted fiber grating 1 may be connected to the second optical input interface 302 of the photo balance detector 3 through an optical fiber, and at the same time, the third port 403 of the fiber row circulator 4 is connected to the second optical input interface 301 of the photo balance detector 3 through an optical fiber, and if the photo balance detector 3 subtracts a signal corresponding to the transmission spectrum of the phase-shifted fiber grating 1 from a signal corresponding to the reflection spectrum of the phase-shifted fiber grating 1, when the transmission end of the phase-shifted fiber grating 1 is connected to the second optical input interface 301 of the photo balance detector 3 through an optical fiber, and the third port 403 of the fiber row circulator 4 is connected to the second optical input interface 302 of the photo balance detector 3 through an optical fiber, the photo balance detector 3 subtracts a signal corresponding to the reflection spectrum of the phase-shifted fiber grating 1 from a signal corresponding to the transmission spectrum of the phase-shifted fiber grating 1.
Both the transmission spectrum and the reflection spectrum of the phase-shifted fiber grating 1 have ultra-narrow peaks.
The phase shift amount of the phase shift fiber grating 1 is pi, and the phase shift point is located at the center of the grating region.
The photoelectric balance detector 3 can automatically differentiate the transmission spectrum and the reflection spectrum of the phase-shifting fiber grating 1.
As shown in fig. 2 to 4, methods for stabilizing sensitivity of phase-shift fiber grating sensing based on wavelength following are used for stabilizing sensitivity of phase-shift fiber grating sensing, and the method is implemented as follows:
, the tunable narrow linewidth laser 5 scans and outputs the wavelength, so as to rapidly locate the position of the ultra-narrow peak in the spectrum of the phase-shift fiber grating 1, and the control system 7 extracts the direct current signal output by the photoelectric balance detector 3;
the control system 7 judges whether the direct current signal is zero, if the direct current signal is zero, the position of the ultra-narrow peak in the spectrum of the phase-shifting fiber grating 1 is positioned, if the direct current signal is not zero, the step is continuously executed, when the position of the ultra-narrow peak is positioned, the wavelength of the light output by the tunable narrow-linewidth laser 5 is at the position where the ultra-narrow peak transmissivity of the phase-shifting fiber grating 1 is 50%, the sensing sensitivity of the phase-shifting fiber grating 1 is highest, and the closer the direct current signal of the output end 303 of the photoelectric balance detector 3 is to zero, the higher the sensing sensitivity of the phase-shifting fiber grating 1 is;
step three: after the position of the ultra-narrow peak in the spectrum of the phase-shift fiber grating 1 is located, the control system 7 immediately stops the wavelength scanning output of the tunable narrow linewidth laser 5, and simultaneously the control system 7 starts the control stage of the light wave following the ultra-narrow peak drift, and the control stage of the light wave following the ultra-narrow peak drift ensures that the light wavelength output by the tunable narrow linewidth laser 5 is always close to the position where the ultra-narrow peak transmissivity of the phase-shift fiber grating 1 is 50%, namely ensures that the light wavelength output by the tunable narrow linewidth laser 5 always follows the movement of the ultra-narrow peak of the phase-shift fiber grating 1;
in the control stage of the optical wave following ultra-narrow peak drift, the control system 7 directly monitors whether the direct current signal is in the threshold range of the direct current signal, if the direct current signal is in the threshold range of the direct current signal, the control stage of the optical wave following ultra-narrow peak drift is continuously executed, at this time, the sensing sensitivity of the phase-shifting fiber grating 1 can be considered to meet the requirement, the optical wavelength output by the tunable narrow-linewidth laser 5 is not required to be tuned, otherwise, the control system 7 judges whether the duration time of the direct current signal which is not in the threshold range of the direct current signal exceeds the time judgment value, if the duration time does not exceed the time judgment value, the control stage of the optical wave following ultra-narrow peak drift is continuously executed, otherwise, the control system 7 tunes the optical wavelength output by the tunable narrow-linewidth laser 5 until the direct current signal is in the threshold range of the direct current signal again, namely, the optical wavelength output by the narrow-tunable linewidth laser 5 approaches the position of the ultra-narrow peak transmittance of the phase-shifting fiber grating 1;
step five: and after the control system 7 tunes the optical wavelength output by the tunable narrow linewidth laser 5, continuing to execute a control stage of the optical wave following the ultra-narrow peak drift.
In the embodiments of the present invention, both the threshold range and the time determination value of the dc signal in step four can be adjusted.
When the system works, firstly the control system 7 makes the tunable narrow-linewidth laser 5 perform wavelength scanning output, and simultaneously extracts a direct current signal, the control system 7 and a user judge the extracted direct current signal together, when the direct current signal is zero, the position of an ultra-narrow peak in the spectrum of the phase-shifting fiber bragg grating 1 is positioned at this moment, then the control system 7 stops the tunable narrow-linewidth laser 5 from performing wavelength scanning output, and simultaneously immediately starts a control stage of the optical wave following the ultra-narrow peak to drift, then the control system 7 judges whether the direct current signal is positioned between the upper limit and the lower limit of a direct current signal threshold, if the direct current signal is positioned between the upper limit and the lower limit of the direct current signal threshold, the control stage of the optical wave following the ultra-narrow peak to drift is continuously performed, otherwise, the control system 7 judges whether the duration time of the direct current signal which is not positioned in the range of the direct, if the duration time does not exceed the time judgment value, continuing to perform a control stage of the optical wave following the ultra-narrow peak drift, otherwise, tuning the optical wavelength output by the tunable narrow linewidth laser 5 by the control system 7, then judging whether the direct current signal is in the threshold range of the direct current signal again by the control system 7, and repeating the content of judging whether the direct current signal is in the threshold range of the direct current signal, so that the optical wavelength output by the tunable narrow linewidth laser 5 follows the movement of the ultra-narrow peak of the phase-shift optical fiber grating 1, thereby always keeping the high sensitivity of the phase-shift optical fiber grating 1 during sensing, and achieving the purpose of overcoming the cross sensitivity of the temperature and strain during the high-precision sensing of the phase-shift optical fiber grating 1.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
- The system is characterized by comprising a phase-shifted fiber grating (1), a photoelectric balance detector (3), a fiber circulator (4), a tunable narrow linewidth laser (5), a data acquisition card (6) and a control system (7), wherein the phase-shifted fiber grating (1) is respectively provided with a transmission end (101) and a reflection end (102), the photoelectric balance detector (3) is respectively provided with two optical input interfaces and two optical input interfaces (301) (302) and optical output interfaces (303), the fiber circulator (4) is respectively provided with ports to three (401) (402) (403), the tunable narrow linewidth laser (5) is respectively provided with an optical input end (501) and an optical output end (502), and the data acquisition card (6) is respectively provided with a signal input end (601) and a signal output end (602), wherein:any optical input interface of the photoelectric balance detector (3) is connected with the transmission end (101), correspondingly, another optical input interface is connected with the third port (403) of the optical fiber circulator (4), the (401) of the optical fiber circulator (4) is connected with the optical input end (501) of the tunable narrow linewidth laser (5), the second port (402) of the optical fiber circulator (4) is connected with the reflection end (102), the optical output interface (303) of the photoelectric balance detector (3) is connected with the signal input end (601) of the data acquisition card (6), the signal output end (602) of the data acquisition card (6) is connected with the control system (7), and the optical output end (502) of the tunable narrow linewidth laser (5) is connected with the control system (7);the transmission light and the reflection light of the phase-shift fiber grating (1) are simultaneously input into a photoelectric balance detector (3), the difference amplification of the reflection spectrum and the transmission spectrum is carried out in the photoelectric balance detector (3), the light wave output by the tunable narrow linewidth laser (5) enters the phase-shift fiber grating (1) through the fiber circulator (4), and the control system (7) is respectively communicated with the data acquisition card (6) and the tunable narrow linewidth laser (5).
- 2. The kind of system for stabilizing sensing sensitivity of fiber grating based on phase shift of wavelength following as claimed in claim 1, wherein the photo balance detector (3) performs differential amplification on the received transmitted light and reflected light of the phase shift fiber grating, so that the ac signal output from the photo balance detector (3) is multiplied and the noise signal is attenuated, and the input optical signal is converted into an electrical signal and then output.
- 3. The kind of wavelength-following-based phase-shifting fiber grating sensing sensitivity stabilizing system as claimed in claim 1, wherein the spectrum of transmitted light and the spectrum of reflected light of the phase-shifting fiber grating 1 each have only ultra-narrow peaks.
- 4. The kind of system for stabilizing the sensing sensitivity of fiber grating based on wavelength following, wherein the phase shift amount of the phase shift fiber grating 1 is pi, and the phase shift point is located at the center of the grating region.
- 5, a method for stabilizing the sensitivity of phase shift fiber grating sensing based on wavelength following, which is used for stabilizing the sensitivity of phase shift fiber grating sensing, and is characterized in that the method comprises the following specific processes:, using a tunable narrow linewidth laser to scan and output wavelength, thereby rapidly positioning the position of the ultra-narrow peak in the spectrum of the phase shift fiber grating, and simultaneously, using a control system to extract the direct current signal output by the photoelectric balance detector;judging whether the direct current signal is zero by using the control system, if the direct current signal is zero, positioning the position of the ultra-narrow peak in the spectrum of the phase-shifting fiber grating, if the direct current signal is not zero, continuing to execute the step , and when the position of the ultra-narrow peak is positioned, the wavelength of light output by the tunable narrow-linewidth laser is positioned at the position where the ultra-narrow peak transmissivity of the phase-shifting fiber grating is 50%, the sensing sensitivity of the phase-shifting fiber grating is highest, and the direct current signal at the output end of the photoelectric balance detector is closer to zero, the higher the sensing sensitivity of the phase-shifting fiber grating is;step three: after the position of an ultra-narrow peak in a phase-shift fiber grating spectrum is located, the control system immediately stops the wavelength scanning output of the tunable narrow linewidth laser, and simultaneously starts a control stage of light wave following the ultra-narrow peak drift, and the control stage of the light wave following the ultra-narrow peak drift ensures that the light wavelength output by the tunable narrow linewidth laser is always close to the position of the phase-shift fiber grating ultra-narrow peak with the transmittance of 50 percent, namely ensures that the light wavelength output by the tunable narrow linewidth laser always follows the movement of the phase-shift fiber grating ultra-narrow peak;step four: in the control stage that the light wave follows the ultra-narrow peak drift, a control system monitors whether the direct current signal is in the threshold range of the direct current signal in real time: if the direct current signal is in the threshold range of the direct current signal, continuing to execute a control stage of the optical wave following the ultra-narrow peak drift, and at the moment, considering that the sensing sensitivity of the phase-shifting fiber bragg grating meets the requirement and not tuning the optical wavelength output by the tunable narrow linewidth laser; otherwise, the control system judges whether the duration time of the direct current signal which is not in the direct current signal threshold range exceeds a time judgment value: if the time judgment value is not exceeded, continuing to execute the control stage of the light wave following the ultra-narrow peak drift; otherwise, the control system tunes the optical wavelength output by the tunable narrow linewidth laser until the direct current signal is in the threshold range of the direct current signal again, the optical wavelength output by the tunable narrow linewidth laser approaches the position of the phase-shift fiber grating with the ultra-narrow peak transmissivity of 50% again, and the drift of the ultra-narrow peak is followed again;step five: and after the control system tunes the optical wavelength output by the tunable narrow linewidth laser, continuously executing a control stage that the optical wavelength follows the ultra-narrow peak drift.
- 6. The method for stabilizing the sensing sensitivity of the phase-shifting fiber grating based on wavelength tracking as claimed in claim 1, wherein the spectrum of the transmitted light and the spectrum of the reflected light of the phase-shifting fiber grating each have only ultra-narrow peaks.
- 7. The method for stabilizing the sensing sensitivity of kinds of phase-shifting fiber gratings based on wavelength following, as claimed in claim 1, wherein the phase-shifting amount of the phase-shifting fiber grating is pi, and the phase-shifting point is located at the center of the grating region.
- 8. The method for stabilizing the sensing sensitivity of phase-shift fiber gratings based on wavelength tracking as claimed in claim 1, wherein in the fourth step, both the threshold range and the time determination value of the DC signal can be adjusted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910820420.7A CN110736436B (en) | 2019-09-01 | 2019-09-01 | Phase-shift fiber grating sensing sensitivity stabilizing method based on wavelength following |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910820420.7A CN110736436B (en) | 2019-09-01 | 2019-09-01 | Phase-shift fiber grating sensing sensitivity stabilizing method based on wavelength following |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110736436A true CN110736436A (en) | 2020-01-31 |
| CN110736436B CN110736436B (en) | 2021-07-06 |
Family
ID=69267403
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910820420.7A Active CN110736436B (en) | 2019-09-01 | 2019-09-01 | Phase-shift fiber grating sensing sensitivity stabilizing method based on wavelength following |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110736436B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115655771A (en) * | 2022-12-27 | 2023-01-31 | 武汉理工大学 | Phase-shift fiber grating sensitization rotating mechanical equipment fault monitoring system and method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007194541A (en) * | 2006-01-23 | 2007-08-02 | Univ Of Yamanashi | Method and apparatus for generating optical pulse signal or electric pulse signal having required waveform |
| US20120194892A1 (en) * | 2011-01-31 | 2012-08-02 | I Shou University | Light extracting device and light extracting method |
| CN102829806A (en) * | 2012-08-23 | 2012-12-19 | 中国科学院半导体研究所 | Optical fiber sensing system based on phase-shifted optical fiber grating |
| CN102931568A (en) * | 2012-11-14 | 2013-02-13 | 浙江大学 | Photoelectricity oscillator based on narrow-band double-peak phase shift fiber bragg grating and method thereof |
| CN103259175A (en) * | 2013-05-04 | 2013-08-21 | 北京航空航天大学 | Tunable narrow-linewidth fiber laser based on interval tunable phase shift fiber gratings |
| CN107181161A (en) * | 2017-07-20 | 2017-09-19 | 南昌航空大学 | A kind of multi-wavelength narrow linewidth ring cavity optical laser system based on phase-shifted fiber grating |
| CN108871419A (en) * | 2018-04-20 | 2018-11-23 | 南京航空航天大学 | More physical quantity optical fiber sensing systems, the control of its feedback loop and its detection method |
| CN108981762A (en) * | 2018-06-19 | 2018-12-11 | 广东工业大学 | Thermostabilization sensing demodulating system and method are carried out using the double phase-shifted fiber gratings in narrowband |
-
2019
- 2019-09-01 CN CN201910820420.7A patent/CN110736436B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007194541A (en) * | 2006-01-23 | 2007-08-02 | Univ Of Yamanashi | Method and apparatus for generating optical pulse signal or electric pulse signal having required waveform |
| US20120194892A1 (en) * | 2011-01-31 | 2012-08-02 | I Shou University | Light extracting device and light extracting method |
| CN102829806A (en) * | 2012-08-23 | 2012-12-19 | 中国科学院半导体研究所 | Optical fiber sensing system based on phase-shifted optical fiber grating |
| CN102931568A (en) * | 2012-11-14 | 2013-02-13 | 浙江大学 | Photoelectricity oscillator based on narrow-band double-peak phase shift fiber bragg grating and method thereof |
| CN103259175A (en) * | 2013-05-04 | 2013-08-21 | 北京航空航天大学 | Tunable narrow-linewidth fiber laser based on interval tunable phase shift fiber gratings |
| CN107181161A (en) * | 2017-07-20 | 2017-09-19 | 南昌航空大学 | A kind of multi-wavelength narrow linewidth ring cavity optical laser system based on phase-shifted fiber grating |
| CN108871419A (en) * | 2018-04-20 | 2018-11-23 | 南京航空航天大学 | More physical quantity optical fiber sensing systems, the control of its feedback loop and its detection method |
| CN108981762A (en) * | 2018-06-19 | 2018-12-11 | 广东工业大学 | Thermostabilization sensing demodulating system and method are carried out using the double phase-shifted fiber gratings in narrowband |
Non-Patent Citations (1)
| Title |
|---|
| 朱翔等: "双波长相移光纤光栅的光谱特性及传感应用", 《光子学报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115655771A (en) * | 2022-12-27 | 2023-01-31 | 武汉理工大学 | Phase-shift fiber grating sensitization rotating mechanical equipment fault monitoring system and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110736436B (en) | 2021-07-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Painchaud et al. | Performance of balanced detection in a coherent receiver | |
| CN106687762B (en) | Double excitation frequency scans interferometer measuration system and method | |
| EP1635488B1 (en) | Optical transmission system using in-line amplifiers | |
| CN109186643B (en) | Accurate sensing system and sensing method based on reflection function resonant filter | |
| JP2008530904A (en) | High bit rate optical communication over multimode fiber | |
| CN109104247B (en) | Broadband signal phase-stabilizing transmission system based on microwave photon link | |
| CN105758434B (en) | Sensing demodulation method based on linear array InGaAs scanning FBG reflectance spectrums | |
| Li et al. | Homodyne laser Doppler vibrometer on silicon-on-insulator with integrated 90 degree optical hybrids | |
| CN111486938A (en) | Interference type optical fiber vibration sensing detection system and method based on self-adaptive filtering | |
| CN102854360A (en) | Stability control device for transmission spectrums of optical fiber current transducer | |
| CN107727365A (en) | A kind of system that optical waveguide loss is measured using reflectance spectrum fineness | |
| CN110346874A (en) | Based on the automatic wavelength locker from homodyne detection | |
| CN107409000B (en) | A kind of coherent receiver, the method and system of coherent source offset estimation and compensation | |
| CN110736436A (en) | Phase-shift fiber grating sensing sensitivity stabilizing system and method based on wavelength following | |
| Khan et al. | Chromatic dispersion monitoring for multiple modulation formats and data rates using sideband optical filtering and asynchronous amplitude sampling technique | |
| CN104848879B (en) | Fiber Bragg grating sensor signal demodulating method based on linear work grating matching method | |
| Wunderlich et al. | Integration of SiON waveguides and photodiodes on silicon substrates | |
| Bourdon et al. | Ultralow loss ring resonators using 3.5% index-contrast Ge-doped silica waveguides | |
| CN111521283A (en) | Laser wavelength and power monitoring device and method | |
| CN206146438U (en) | Fiber grating data demodulalation system | |
| Marpaung et al. | Design and realization of an integrated optical frequency modulation discriminator for a high performance microwave photonic link | |
| CN113673677A (en) | Method, equipment and medium for realizing nonlinear activation function RELU | |
| Braun | Design of single layer antireflection coatings for InP/In 0.53 Ga 0.47 As/InP photodetectors for the 1200–1600-nm wavelength range | |
| CN108337046B (en) | FTTx terminal line tester | |
| CN206989975U (en) | A kind of embedded segmentation scanning fiber bragg grating sensing demodulating system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |