CN117686008B - Fiber Bragg grating signal demodulation system and method based on image processing - Google Patents
Fiber Bragg grating signal demodulation system and method based on image processing Download PDFInfo
- Publication number
- CN117686008B CN117686008B CN202410138402.1A CN202410138402A CN117686008B CN 117686008 B CN117686008 B CN 117686008B CN 202410138402 A CN202410138402 A CN 202410138402A CN 117686008 B CN117686008 B CN 117686008B
- Authority
- CN
- China
- Prior art keywords
- image processing
- wavelength
- bragg grating
- change
- fiber
- 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.)
- Active
Links
- 238000012545 processing Methods 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000000835 fiber Substances 0.000 claims abstract description 45
- 230000008859 change Effects 0.000 claims abstract description 44
- 230000003287 optical effect Effects 0.000 claims abstract description 37
- 230000007613 environmental effect Effects 0.000 claims abstract description 31
- 239000013307 optical fiber Substances 0.000 claims description 26
- 230000008569 process Effects 0.000 claims description 6
- 238000012935 Averaging Methods 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 description 10
- 238000005259 measurement Methods 0.000 description 9
- 230000008901 benefit Effects 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 4
- 206010070834 Sensitisation Diseases 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000008313 sensitization Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003708 edge detection Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000012858 packaging process Methods 0.000 description 1
- 238000012536 packaging technology Methods 0.000 description 1
Landscapes
- Optical Transform (AREA)
Abstract
The invention discloses an image processing-based fiber Bragg grating signal demodulation system and method, wherein a broadband light source ASE, a fiber Bragg grating FBG, an optical circulator, a fiber Mach-Zehnder interferometer and a stripe recognition and image processing system are used for demodulating the signals of the fiber Bragg gratings; the invention converts the Bragg wavelength shift of the fiber Bragg grating caused by the change of the environmental condition into the fringe change of the fiber Mach-Zehnder interferometer, and utilizes the obvious wide and narrow difference between the dark fringe and the bright fringe of the interference pattern and the obvious distinguishing characteristic to quickly and accurately automatically identify the change of the fringe spacing, thereby determining the input wavelength (namely the reflection wavelength of the FBG) of the interferometer, which is shifted relative to the initial wavelength, and the real-time reflection wavelength of the FBG corresponds to the influence of the environmental parameter one by one, so as to realize the change of the fringe spacing and demodulate the change of the environmental parameter.
Description
Technical Field
The invention belongs to the field of multi-disciplinary intersection of FBG sensing technology and signal demodulation method thereof, fiber Mach-Zehnder interference technology and digital image processing, and particularly relates to a fiber Bragg grating signal demodulation system and method based on image processing.
Background
The optical fiber sensor has wide application prospect in the fields of ocean science, civil engineering, petrochemical industry, aerospace and the like, and has the advantages of electric insulation, electromagnetic interference resistance, high sensitivity, high temperature resistance, corrosion resistance, passive sensor end, intrinsic safety, long-distance transmission without signal conversion and an amplifier, small volume, light weight and the like. The optical fiber sensing technology comprises phase modulation and wavelength modulation sensors. The interference type sensor of the phase modulation type optical fiber sensor has the characteristics of high precision and the like, the most typical wavelength modulation type is FBG, the FBG not only has wide application in the field of optical fiber communication, but also has wide application in the field of optical fiber sensing, but the performance advantages and disadvantages of the FBG sensor depend on the FBG itself, the packaging technology and the sensitization technology thereof, and have great relation with the signal demodulation method thereof, and researchers are devoted to the research on the signal demodulation method of the FBG sensing technology for a long time.
Aiming at the requirement of further intensive research on the signal demodulation method of the prior FBG sensing technology, the Bragg reflection wavelength of the FBG is input into an optical fiber Mach-Zehnder interferometer, and the interferometer is arranged in a stable environment, so that the interference fringe change of the interferometer is only related to the input Bragg reflection wavelength, once the Bragg wavelength of the FBG is influenced by the external environment, the distance between the interference fringes is changed, a changing image of the interference fringes is captured by a camera and is used as an original image to perform corresponding image processing, the accurate interference fringe distance is finally obtained, the offset of the Bragg reflection wavelength caused by the change of external environment parameters can be determined according to the relation between the fringe distance and the input wavelength of the interferometer, the sensing signal demodulation modulated to the FBG is realized, and the very accurate Bragg reflection wavelength offset can be obtained through image processing and nanoscale pattern length measurement.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an optical fiber Bragg grating signal demodulation system and method based on image processing, which convert Bragg wavelength offset of an optical fiber Bragg grating caused by environmental condition change into fringe change of an optical fiber Mach-Zehnder interferometer, and rapidly, accurately and automatically identify the change of fringe spacing size by utilizing the obvious wide-narrow difference and distinguishing obvious characteristics of dark fringes and bright fringes of an interference pattern, thereby determining the input wavelength (namely the reflection wavelength of the FBG) of the interferometer and the offset relative to the initial wavelength, and realizing the one-to-one correspondence of the real-time reflection wavelength of the FBG and the influence of environmental parameters, so as to realize the demodulation of the change of the ambient parameter by the fringe spacing change of the interference fringes.
In order to achieve the above object, the present invention provides the following solutions:
An image processing-based fiber bragg grating signal demodulation system, comprising:
broadband light source ASE, fiber Bragg grating FBG, optical circulator, fiber Mach-Zehnder interferometer and stripe recognition and image processing system;
the broadband light source ASE is used for emitting light signals;
the optical circulator is used for transmitting the optical signal to the fiber bragg grating FBG;
the fiber Bragg grating FBG is used for generating Bragg wavelength based on the optical signal and transmitting the Bragg wavelength meeting the phase matching condition to the fiber Mach-Zehnder interferometer through the optical circulator;
the optical fiber Mach-Zehnder interferometer is used for generating interference fringes based on the Bragg wavelength meeting the phase matching condition;
The fringe identification and image processing system is used for processing the interference fringes to realize the demodulation of the environmental parameter signals modulated onto the fiber Bragg gratings FBG.
Preferably, the optical circulator includes: a first port, a second port, and a third port;
The optical signal emitted by the broadband light source ASE is incident from a first port of the optical circulator, is emitted from a second port and transmitted to the fiber Bragg grating FBG, and the Bragg wavelength meeting the phase matching condition is reflected back to the second port of the optical circulator and then emitted from a third port of the optical circulator and enters the fiber Mach-Zehnder interferometer; wherein the reflected wavelength is shifted by environmental parameters.
Preferably, the process of processing the interference fringes to demodulate the environmental parameter signal modulated onto the fiber bragg grating FBG includes:
Capturing a change image of the interference fringes by a camera, and performing corresponding image processing by taking the change image as an original image to obtain the interference fringe spacing;
and determining the offset of the Bragg reflection wavelength caused by the change of the external environment parameters according to the relation between the interference fringe spacing and the input wavelength of the interferometer, and realizing the demodulation of the environment parameter signals modulated to the fiber Bragg grating FBG.
Preferably, capturing a change image of the interference fringes by a camera, and performing corresponding image processing by using the change image as an original image, wherein the process of obtaining the interference fringe spacing comprises the following steps:
performing image processing identification on the distance between adjacent dark stripes to obtain the distance between the dark stripes;
performing image processing identification on the distance between adjacent bright stripes to obtain the distance between the bright stripes;
And averaging the bright fringe spacing and the dark fringe spacing obtained at the same time to obtain the interference fringe spacing.
Preferably, the relationship between fringe spacing and interferometer input wavelength is:
d=λ/(2ρd), where D is the diameter of the fiber, λ is the interferometer input wavelength, and D is the fringe spacing.
The invention also provides an optical fiber Bragg grating signal demodulation method based on image processing, which comprises the following steps:
Acquiring an optical signal;
generating a bragg wavelength based on the optical signal;
Generating interference fringes based on the bragg wavelength satisfying the phase matching condition;
And processing the interference fringes to realize the demodulation of the environmental parameter signals.
Preferably, the method for processing the interference fringes and realizing the demodulation of the environmental parameter signal comprises the following steps:
Capturing a change image of the interference fringes by a camera, and performing corresponding image processing by taking the change image as an original image to obtain the interference fringe spacing;
And determining the offset of the Bragg reflection wavelength caused by the change of the external environment parameters according to the relation between the interference fringe spacing and the input wavelength of the interferometer, and realizing the demodulation of the environment parameter signals.
Preferably, the method for capturing a change image of interference fringes by a camera and performing corresponding image processing by taking the change image as an original image to obtain the interference fringe spacing comprises the following steps:
performing image processing identification on the distance between adjacent dark stripes to obtain the distance between the dark stripes;
performing image processing identification on the distance between adjacent bright stripes to obtain the distance between the bright stripes;
And averaging the bright fringe spacing and the dark fringe spacing obtained at the same time to obtain the interference fringe spacing.
Preferably, the relationship between fringe spacing and interferometer input wavelength is:
d=λ/(2ρd), where D is the diameter of the fiber, λ is the interferometer input wavelength, and D is the fringe spacing.
Compared with the prior art, the invention has the beneficial effects that:
The interference type optical fiber sensing is one of the sensors with highest measurement precision in the optical fiber sensing technology, and mainly benefits from the treatment of interference fringes; image processing technology has evolved to today, with scale measurements on the order of nanometers. According to the obvious characteristics of obvious width difference and obvious distinction between dark fringes and bright fringes of the interference pattern, the image processing technology and the optical fiber interference technology are effectively fused in the sensing system of the FBG, the micro offset of the Bragg reflection wavelength of the FBG, which is influenced by the environmental parameter, is converted into the interference fringe change of the optical fiber interferometer, meanwhile, the optical fiber interferometer is arranged in a monitoring center with stable parameters, so that the fringe change of the interferometer is only influenced by the input wavelength of the interferometer, as only one variable of the input wavelength is needed, the space between the fringes is changed as long as the interference fringe is changed, the precise measurement of the image processing is utilized to determine how much the input wavelength of the interferometer (the Bragg reflection wavelength of the FBG) is changed, so that the environmental parameter signal modulated on the FBG sensing element is demodulated, and once the external environmental parameter influences the FBG, the environmental parameter signal can be demodulated through precise measurement of the space between the interference fringes by utilizing the system and the demodulation method, which is simple, precise and rapid; in addition, because the accuracy of image processing on interference fringe spacing measurement can be measured by only slightly changing the input wavelength of the interferometer and the fringe spacing at the moment can be measured by the image processing, the demodulation method of the invention can also increase the sensitivity of the Bragg reflection wavelength on the environmental parameters without sensitization of the FBG sensing element, thereby simplifying the sensitization packaging of the FBG sensing element and the packaging process thereof and improving the stability and reliability of the sensor in the long-term use process.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the embodiments are briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a diagram of an FBG sensing and demodulation system in an embodiment of the invention;
FIG. 2 is a schematic diagram of ASE spectrum incident on an FBG and reflection spectrum of the FBG according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a portion of an interference fringe of an interferometer output in an embodiment of the present invention.
Description of the drawings: 1-a first port; 2-a second port; 3-third port.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Example 1
As shown in fig. 1, the present invention provides an optical fiber bragg grating signal demodulation system based on image processing, including:
broadband light source ASE, fiber Bragg grating FBG, optical circulator, fiber Mach-Zehnder interferometer and stripe recognition and image processing system;
The broadband light source ASE is used for emitting light signals;
the optical circulator is used for transmitting the optical signal to the fiber bragg grating FBG;
The fiber Bragg grating FBG is used for generating Bragg wavelength based on the optical signal and transmitting the Bragg wavelength meeting the phase matching condition to the fiber Mach-Zehnder interferometer through the optical circulator;
the optical fiber Mach-Zehnder interferometer is used for generating interference fringes based on the Bragg wavelength meeting the phase matching condition;
the fringe identification and image processing system is used for processing the interference fringes to realize the demodulation of the environmental parameter signals modulated onto the fiber Bragg gratings FBG.
In this embodiment, an optical signal emitted by the broadband light source ASE is incident from the first port 1 of the optical circulator and is emitted and transmitted to the FBG through the second port 2, the bragg wavelength meeting the phase matching condition is reflected back to the second port 2 of the optical circulator, then the optical signal is emitted from the third port 3 and enters the optical fiber mach-zehnder interferometer, two output ports of the interferometer are both connected with an interference fringe processing system, and the processing system rapidly and accurately automatically identifies the size of the fringe spacing through image processing after obtaining the interference fringes. After the optical signal emitted by the ASE is incident on the FBG, the incident spectrum and the reflection spectrum of the FBG are shown as shown in figure 2, the incident end of the FBG is provided with a Bragg reflection wavelength signal which is reflected back, the reflection wavelength is influenced by the environmental parameter and can deviate, and further the measurement of the environmental parameter is realized.
In this embodiment, the interferometer-connected fringe processing system is first a camera, the camera captures the fringe output by the optical fiber, then uses the captured fringe photograph as an original picture to perform image filtering, edge detection image processing and analysis, and then identifies and measures the distance between the fringes.
In this embodiment, as shown in fig. 3, part of interference fringes is shown, the interference fringe processing system of one output port performs image processing and identification on the distance between adjacent dark fringes, the interference fringe processing system of the other output port performs image processing and identification on the distance between adjacent bright fringes, and then averages the bright fringe distance and the dark fringe distance output by the two interference fringe processing systems at the same time, so as to reduce accidental errors in the recognition and calculation of the fringe distance caused by the image processing process and other factors, improve the measurement precision of the distance, and finally achieve higher demodulation precision of the FBG wavelength offset. In addition, in order to make the measurement error smaller, when the processing system recognizes and calculates the fringe spacing, image processing is carried out on 5 continuous dark fringes or 5 continuous bright fringes as a group each time, then the spacing of the 5 interference fringes is recognized and calculated, then the spacing of two adjacent dark fringes or bright fringes is obtained, then a plurality of groups of interference fringes are taken for carrying out the same processing to obtain the adjacent fringe spacing of the group, and finally the average value of the adjacent dark fringes or the adjacent bright fringes of the processing system is obtained.
In this embodiment, the optical fiber mach-zehnder interferometer is placed in the monitoring center with stable environmental parameters, so that the interference fringes of the interferometer are only affected by the input wavelength λ, according to the system shown in fig. 1, the input wavelength is the bragg reflection wavelength of the FBG, the fringe spacing d=λ/(2pi D), where D is the diameter of the optical fiber, and when the external environmental parameters affect the FBG, its bragg reflection wavelength will shift toward the short wavelength or the long wavelength, so that once the FBG is affected by the environmental parameters, its bragg reflection wavelength will shift, thereby causing the spacing of the interference fringes to become smaller or larger, and finally solving the parameter variation information of the FBG modulated by the environmental parameters.
Example two
The invention also provides an optical fiber Bragg grating signal demodulation method based on image processing, which comprises the following steps:
Acquiring an optical signal;
generating a bragg wavelength based on the optical signal;
Generating interference fringes based on the bragg wavelength satisfying the phase matching condition;
And processing the interference fringes to realize the demodulation of the environmental parameter signals.
In this embodiment, the method for processing the interference fringes and implementing demodulation of the environmental parameter signal includes:
Capturing a change image of the interference fringes by a camera, and performing corresponding image processing by taking the change image as an original image to obtain the interference fringe spacing;
And determining the offset of the Bragg reflection wavelength caused by the change of the external environment parameters according to the relation between the interference fringe spacing and the input wavelength of the interferometer, and realizing the demodulation of the environment parameter signals.
In this embodiment, a method for capturing a change image of interference fringes by a camera, and performing corresponding image processing by using the change image as an original image to obtain an interference fringe distance includes:
performing image processing identification on the distance between adjacent dark stripes to obtain the distance between the dark stripes;
performing image processing identification on the distance between adjacent bright stripes to obtain the distance between the bright stripes;
And averaging the bright fringe spacing and the dark fringe spacing obtained at the same time to obtain the interference fringe spacing.
In this embodiment, the relationship between the fringe spacing and the input wavelength of the interferometer is:
d=λ/(2ρd), where D is the diameter of the fiber, λ is the interferometer input wavelength, and D is the fringe spacing.
The invention converts the Bragg wavelength shift of the fiber Bragg grating caused by the change of the environmental condition into the fringe change of the fiber Mach-Zehnder interferometer, and utilizes the obvious color difference between the dark fringe and the bright fringe of the interference pattern and the obvious distinguishing characteristic to quickly and accurately automatically identify the change of the fringe spacing, thereby determining the input wavelength (namely the reflection wavelength of the FBG) of the interferometer, which is shifted relative to the initial wavelength, and the real-time reflection wavelength of the FBG corresponds to the influence of the environmental parameter one by one, so as to realize the change of the fringe spacing and demodulate the change of the environmental parameter.
The above embodiments are merely illustrative of the preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, but various modifications and improvements made by those skilled in the art to which the present invention pertains are made without departing from the spirit of the present invention, and all modifications and improvements fall within the scope of the present invention as defined in the appended claims.
Claims (5)
1. An image processing-based fiber bragg grating signal demodulation system, comprising:
broadband light source ASE, fiber Bragg grating FBG, optical circulator, fiber Mach-Zehnder interferometer and stripe recognition and image processing system;
the broadband light source ASE is used for emitting light signals;
the optical circulator is used for transmitting the optical signal to the fiber bragg grating FBG;
the fiber Bragg grating FBG is used for generating Bragg wavelength based on the optical signal and transmitting the Bragg wavelength meeting the phase matching condition to the fiber Mach-Zehnder interferometer through the optical circulator;
the optical fiber Mach-Zehnder interferometer is used for generating interference fringes based on the Bragg wavelength meeting the phase matching condition;
The fringe identification and image processing system is used for processing the interference fringes to realize the demodulation of the environmental parameter signals modulated onto the fiber Bragg gratings FBG;
the interference fringes are processed, and the process of demodulating the environment parameter signals modulated on the fiber Bragg grating FBG comprises the following steps:
Capturing a change image of the interference fringes by a camera, and performing corresponding image processing by taking the change image as an original image to obtain the interference fringe spacing;
According to the relation between the interference fringe spacing and the input wavelength of the interferometer, determining the offset of the Bragg reflection wavelength caused by the change of external environment parameters, and realizing the demodulation of the environment parameter signals modulated to the fiber Bragg grating FBG;
the relationship between fringe spacing and interferometer input wavelength is:
d=λ/(2ρd), where D is the diameter of the fiber, λ is the interferometer input wavelength, and D is the fringe spacing.
2. The image processing based fiber bragg grating signal demodulation system of claim 1 wherein said optical circulator comprises: a first port, a second port, and a third port;
The optical signal emitted by the broadband light source ASE is incident from a first port of the optical circulator, is emitted from a second port and transmitted to the fiber Bragg grating FBG, and the Bragg wavelength meeting the phase matching condition is reflected back to the second port of the optical circulator and then emitted from a third port of the optical circulator and enters the fiber Mach-Zehnder interferometer; wherein the reflected wavelength is shifted by environmental parameters.
3. The image processing-based fiber bragg grating signal demodulation system according to claim 1, wherein the process of capturing a change image of interference fringes by a camera and performing corresponding image processing with the change image as an original image to obtain an interference fringe pitch comprises:
performing image processing identification on the distance between adjacent dark stripes to obtain the distance between the dark stripes;
performing image processing identification on the distance between adjacent bright stripes to obtain the distance between the bright stripes;
And averaging the bright fringe spacing and the dark fringe spacing obtained at the same time to obtain the interference fringe spacing.
4. The optical fiber Bragg grating signal demodulation method based on image processing is characterized by comprising the following steps of:
Acquiring an optical signal;
generating a bragg wavelength based on the optical signal;
Generating interference fringes based on the bragg wavelength satisfying the phase matching condition;
Processing the interference fringes to realize the demodulation of environmental parameter signals;
the interference fringes are processed, and the method for demodulating the environmental parameter signals comprises the following steps:
Capturing a change image of the interference fringes by a camera, and performing corresponding image processing by taking the change image as an original image to obtain the interference fringe spacing;
according to the relation between the interference fringe spacing and the input wavelength of the interferometer, determining the offset of the Bragg reflection wavelength caused by the change of the external environment parameters, and realizing the demodulation of the environment parameter signals;
the relationship between fringe spacing and interferometer input wavelength is:
d=λ/(2ρd), where D is the diameter of the fiber, λ is the interferometer input wavelength, and D is the fringe spacing.
5. The method for demodulating an optical fiber bragg grating signal based on image processing according to claim 4, wherein capturing a change image of interference fringes by a camera, and performing corresponding image processing with the change image as an original image, the method for obtaining an interference fringe pitch comprises:
performing image processing identification on the distance between adjacent dark stripes to obtain the distance between the dark stripes;
performing image processing identification on the distance between adjacent bright stripes to obtain the distance between the bright stripes;
And averaging the bright fringe spacing and the dark fringe spacing obtained at the same time to obtain the interference fringe spacing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410138402.1A CN117686008B (en) | 2024-02-01 | 2024-02-01 | Fiber Bragg grating signal demodulation system and method based on image processing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410138402.1A CN117686008B (en) | 2024-02-01 | 2024-02-01 | Fiber Bragg grating signal demodulation system and method based on image processing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117686008A CN117686008A (en) | 2024-03-12 |
| CN117686008B true CN117686008B (en) | 2024-04-26 |
Family
ID=90126855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410138402.1A Active CN117686008B (en) | 2024-02-01 | 2024-02-01 | Fiber Bragg grating signal demodulation system and method based on image processing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117686008B (en) |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000186912A (en) * | 1998-12-22 | 2000-07-04 | Seiko Giken:Kk | Method and device for measuring minute displacements |
| CN103148957A (en) * | 2013-03-04 | 2013-06-12 | 杭州电子科技大学 | Twin-core photonic crystal fiber-based interferometric temperature sensing method and device |
| CN104833314A (en) * | 2015-06-03 | 2015-08-12 | 中国科学技术大学 | High-resolution optical fiber strain sensor and measuring method |
| CN105806468A (en) * | 2016-05-06 | 2016-07-27 | 华中科技大学 | Fiber bragg grating vibration sensor and detection device thereof |
| CN106052866A (en) * | 2016-05-11 | 2016-10-26 | 中南民族大学 | Biophoton spectrum detection system and method |
| CN106197323A (en) * | 2016-06-27 | 2016-12-07 | 长春理工大学 | Inner circle cone angle laser-interfering measurement device and method |
| CN106840221A (en) * | 2017-01-06 | 2017-06-13 | 武汉理工大学 | Fiber grating demodulation device and method based on dispersion Mach Zehnder interferometry |
| CN108387251A (en) * | 2018-01-22 | 2018-08-10 | 大连理工大学 | A kind of fiber Bragg grating (FBG) demodulator device and method |
| CN209056145U (en) * | 2018-03-13 | 2019-07-02 | 南京信息工程大学 | A kind of system measuring grating constant |
| CN110967107A (en) * | 2019-12-03 | 2020-04-07 | 北京北方车辆集团有限公司 | Interference type fiber Bragg grating acoustic emission signal sensing system |
| CN112763458A (en) * | 2020-12-24 | 2021-05-07 | 汕头大学 | Optical fiber humidity detection device based on Mach-Zehnder interference |
| CN113155165A (en) * | 2021-05-14 | 2021-07-23 | 武汉理工大学 | Interference type demodulation system and method for large-capacity fiber grating sensor network |
| CN114089475A (en) * | 2022-01-11 | 2022-02-25 | 之江实验室 | Quasi-distributed fiber Bragg grating demodulation chip and bearing equipment |
| CN116222435A (en) * | 2023-03-13 | 2023-06-06 | 合肥工业大学 | Device and method for measuring precise angular displacement by vortex rotation and plane wave interference |
-
2024
- 2024-02-01 CN CN202410138402.1A patent/CN117686008B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000186912A (en) * | 1998-12-22 | 2000-07-04 | Seiko Giken:Kk | Method and device for measuring minute displacements |
| CN103148957A (en) * | 2013-03-04 | 2013-06-12 | 杭州电子科技大学 | Twin-core photonic crystal fiber-based interferometric temperature sensing method and device |
| CN104833314A (en) * | 2015-06-03 | 2015-08-12 | 中国科学技术大学 | High-resolution optical fiber strain sensor and measuring method |
| CN105806468A (en) * | 2016-05-06 | 2016-07-27 | 华中科技大学 | Fiber bragg grating vibration sensor and detection device thereof |
| CN106052866A (en) * | 2016-05-11 | 2016-10-26 | 中南民族大学 | Biophoton spectrum detection system and method |
| CN106197323A (en) * | 2016-06-27 | 2016-12-07 | 长春理工大学 | Inner circle cone angle laser-interfering measurement device and method |
| CN106840221A (en) * | 2017-01-06 | 2017-06-13 | 武汉理工大学 | Fiber grating demodulation device and method based on dispersion Mach Zehnder interferometry |
| CN108387251A (en) * | 2018-01-22 | 2018-08-10 | 大连理工大学 | A kind of fiber Bragg grating (FBG) demodulator device and method |
| CN209056145U (en) * | 2018-03-13 | 2019-07-02 | 南京信息工程大学 | A kind of system measuring grating constant |
| CN110967107A (en) * | 2019-12-03 | 2020-04-07 | 北京北方车辆集团有限公司 | Interference type fiber Bragg grating acoustic emission signal sensing system |
| CN112763458A (en) * | 2020-12-24 | 2021-05-07 | 汕头大学 | Optical fiber humidity detection device based on Mach-Zehnder interference |
| CN113155165A (en) * | 2021-05-14 | 2021-07-23 | 武汉理工大学 | Interference type demodulation system and method for large-capacity fiber grating sensor network |
| CN114089475A (en) * | 2022-01-11 | 2022-02-25 | 之江实验室 | Quasi-distributed fiber Bragg grating demodulation chip and bearing equipment |
| CN116222435A (en) * | 2023-03-13 | 2023-06-06 | 合肥工业大学 | Device and method for measuring precise angular displacement by vortex rotation and plane wave interference |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117686008A (en) | 2024-03-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108534811B (en) | Cavity length demodulation algorithm of short-cavity optical fiber Fabry-Perot sensor | |
| CN108562237B (en) | Device and method for performing spectrum calibration in optical frequency domain reflection sensing system by adopting HCN (hydrogen cyanide) air chamber | |
| CN104215368A (en) | F-P cavity optical fiber pressure sensing device and demodulation method thereof | |
| CN111006786B (en) | Double-path high-precision temperature demodulation method based on distributed optical fiber Raman sensing system | |
| CN110823262A (en) | High-sensitivity fiber grating sensing method and system based on light quantum technology | |
| CN108917974A (en) | Silicon optical chip temperature measuring device and method based on OFDR | |
| CN201903351U (en) | Demodulation device for dynamic change of fiber bragg grating | |
| CN117686008B (en) | Fiber Bragg grating signal demodulation system and method based on image processing | |
| CN107314823B (en) | The Method for Phase Difference Measurement and device of interferometric optical fiber sensor | |
| CN108426594B (en) | Fiber grating reflection spectrum demodulation system of correlation algorithm | |
| CN116839758A (en) | Optical fiber sensing demodulation system with high signal-to-noise ratio and high precision and implementation method thereof | |
| CN115931022B (en) | Demodulation system of optical fiber Fabry-Perot sensor | |
| CN108204827A (en) | A kind of phase-shifted fiber grating demodulating system | |
| CN108896091B (en) | A kind of scaling method and system of fiber Bragg grating (FBG) demodulator | |
| CN204101218U (en) | A kind of F-P cavity fiber pressure sensing device | |
| CN113916271B (en) | Optical sensor addressing chip, module, measuring system and measuring method | |
| CN113325574B (en) | Double-light-source cavity length matching demodulation method of optical fiber Fabry-Perot sensor | |
| CN111521206B (en) | Wavelength demodulation method for fiber grating edge superposition filtering | |
| CN115267253A (en) | Flow velocity measuring method based on unbalanced mach zehnder interferometer and fiber grating | |
| CN210376136U (en) | PH sensor based on micro-nano optical fiber and end surface reflection | |
| CN110044401A (en) | A kind of signal demodulating method and system of fibre optical sensor | |
| CN113790743B (en) | Wavelength demodulation algorithm for fiber grating sensing system | |
| CN219935149U (en) | Optical fiber sensing demodulation system based on phase-locked loop | |
| CN111288896B (en) | Displacement detection system based on asymmetric interference structure and detection method thereof | |
| CN111637906B (en) | Fiber grating demodulation device and method based on self-differencing coherence |
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 |