CN110411342B - Optical fiber in-place sensor, optical fiber in-place sensing system and in-place detection method - Google Patents
Optical fiber in-place sensor, optical fiber in-place sensing system and in-place detection method Download PDFInfo
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- CN110411342B CN110411342B CN201910701321.7A CN201910701321A CN110411342B CN 110411342 B CN110411342 B CN 110411342B CN 201910701321 A CN201910701321 A CN 201910701321A CN 110411342 B CN110411342 B CN 110411342B
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- 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
Abstract
The invention discloses an optical fiber in-place sensor, wherein a collimator fixed support is arranged in a fixed end shell, a spring sheet shielding groove of the collimator fixed support is positioned between a collimator left section probe mounting hole and a collimator right section probe mounting hole, a fixed end of a magnetic metal spring sheet is fixed on the collimator fixed support, a collimator laser signal shielding end of the collimator fixed support is positioned in the spring sheet shielding groove, a collimator left section probe of an optical fiber collimator is arranged in the collimator left section probe mounting hole, a collimator right section probe of the optical fiber collimator is arranged in the collimator right section mounting hole, and the collimator left section probe and the collimator right section probe can be shielded by a collimator laser signal shielding end of the magnetic metal spring sheet; the sensor moving end is provided with a magnet, and the magnet can suck up the collimator laser signal shielding end of the magnetic metal elastic sheet when the relative position between the sensor moving end and the sensor fixed end is in a in-place state. The invention can be applied to the strong electromagnetic interference environment.
Description
Technical Field
The invention relates to the technical field of optical fiber sensing, in particular to an optical fiber in-place sensor, an optical fiber in-place sensing system and an in-place detection method.
Technical Field
The optical fiber sensing technology has the characteristics of electric insulation, electromagnetic interference resistance, corrosion resistance, strong chemical stability, wide measurement range, long distance and the like. Present in-place detection systems are based on electrical sensors such as capacitive proximity sensors, inductive proximity sensors, etc. Its theory of operation is when the measured object is close to the response region of sensor, converts positional information into the signal of telecommunication, utilizes the cable with signal of telecommunication transmission to control center to drive other equipment work, and be applied to automatic industrial production mostly, but under the application occasion that requires anti-electromagnetic interference, traditional electricity class sensor that targets in place can't reach the requirement.
Disclosure of Invention
The invention aims to solve the technical problems and provides an in-place detection system and method based on optical fiber sensing, wherein the optical fiber sensing technology is used for detecting the movement position of equipment parts and transmitting signals in the running environment of very-low-frequency equipment with high field intensity, large temperature difference and strong vibration, and the following technical problems are mainly solved:
(1) the positioning detection technical problem in a strong electromagnetic environment is solved, in-place signals of equipment during movement are converted into optical signals through an optical fiber proximity switch, and the optical signals are transmitted to a demodulation module through unarmored optical fibers; the problem of optic fibre proximity switch can accurate detection equipment motion position information to respond to rapidly etc is solved.
(2) The problems of accuracy, reliability and stability of the operation of the proximity switch under extreme environments of high field intensity, large temperature difference, strong vibration and the like are solved.
In order to achieve the purpose, the invention designs an optical fiber in-place sensor, which is characterized in that: it comprises a sensor fixed end and a sensor movable end, wherein the sensor fixed end comprises a fixed end shell, an optical fiber collimator, a collimator fixed support and a magnetic metal elastic sheet, the collimator fixed support is arranged in the fixed end shell, a collimator left section mounting hole, a collimator right section mounting hole and a spring plate shielding groove are formed in the collimator fixed support, the spring plate shielding groove is located between the collimator left section probe mounting hole and the collimator right section probe mounting hole, the fixed end of a magnetic metal spring plate is fixed on the collimator fixed support, a collimator laser signal shielding end of the magnetic metal spring plate is located in the spring plate shielding groove, a collimator left section probe of the optical fiber collimator is arranged in the collimator left section probe mounting hole, a collimator right section probe of the optical fiber collimator is arranged in the collimator right section mounting hole, and the collimator left section probe and the collimator right section probe can be shielded by a collimator laser signal shielding end of the magnetic metal spring plate; the sensor moving end is provided with a magnet, and the magnet can suck up the collimator laser signal shielding end of the magnetic metal elastic sheet when the relative position between the sensor moving end and the sensor fixed end is in a in-place state, so that the laser signal between the left section of the collimator probe and the right section of the collimator probe is conducted.
An optical fiber in-place sensing system based on the sensor comprises a demodulation module, a multi-core optical fiber connector and an optical fiber in-place sensor, wherein the demodulation module comprises a laser light source and a photoelectric detector, a laser signal output end of the laser light source is connected with a left section probe of an optical fiber collimator in the optical fiber in-place sensor through a transmission optical fiber and the multi-core optical fiber connector in sequence, a right section probe of the optical fiber collimator in the optical fiber in-place sensor is connected with an optical signal detection end of the photoelectric detector through the multi-core optical fiber connector and the transmission optical fiber in sequence, and an electric signal output end of the photoelectric detector is used for outputting an electric signal whether the optical fiber is in place or not.
A method for detecting in-place by using the system is characterized by comprising the following steps:
step 1: the fixed end of the sensor is arranged at an in-place detection fixed station, and the movable end of the sensor is arranged on a moving object to be detected;
step 2: the laser signal output by the laser source is transmitted to a left section of a collimator probe of a fiber collimator in the fiber in-place sensor through a transmission fiber and a multi-core fiber connector in sequence, at the moment, the moving end of the sensor on the moving object to be detected is not in a in-place state relative to the fixed end of the sensor, the left section of the collimator probe and the right section of the collimator probe are separated by a collimator laser signal shielding end of a magnetic metal elastic sheet, the laser signal cannot be conducted, and the photoelectric detector cannot receive the returned laser signal;
and step 3: when the moving end of the sensor moves to the in-place state position relative to the fixed end of the sensor, the magnet on the moving end of the sensor absorbs the laser signal shielding end of the collimator with the magnetic metal elastic sheet, at the moment, the laser signal between the left section probe of the collimator and the right section probe of the collimator is conducted, the returned laser signal enters the photoelectric detector through the multi-core optical fiber connector and the transmission optical fiber, and the photoelectric detector is triggered to be in-place.
The in-place detection system of the invention relies on the optical fiber sensing technology to realize the passive detection function of the in-place signal of the remote and multipoint equipment. The device in-place signal is converted into an optical signal through an optical fiber in-place sensor, the optical signal is transmitted to a demodulation module through an optical fiber and a connector, and finally the optical signal is converted into an electric signal through the demodulation module to be output. The in-place state detection system can simultaneously detect 4 paths of state signals of the equipment to be detected. And each path of equipment state signal is detected by an optical fiber in-place sensor. The optical fiber in-place sensor consists of a sensor moving end and a sensor fixing end. Both parts are installed in the device to be tested.
According to the structural design of the equipment to be tested, when the equipment to be tested works, the moving end of the sensor is pushed to move; when the movable end of the sensor is aligned with the fixed end of the sensor, the fixed end of the sensor can be attracted by magnetic force, so that the elastic sheet at the fixed end of the sensor is upwards bounced, the light path between the two optical fiber collimators is conducted, and light emitted by the light source returns to the photoelectric detector of the demodulation module after passing through the collimators. The demodulation module detects whether light returns by using the photoelectric detector to judge the moving position of the device to be detected. Compared with the traditional electric proximity sensor, the in-place sensor can be applied to the strong electromagnetic interference environment, not only can realize long-distance signal transmission by using an optical cable, but also has the transmission speed far higher than that of the electric sensor.
Drawings
FIG. 1 is a schematic diagram of an optical fiber bit detection system according to the present invention;
FIG. 2 is a schematic structural view of the fiber-in-place sensor of the present invention in the in-place state;
FIG. 3 is a schematic structural view of the fiber in-place sensor of the present invention prior to being in place;
FIG. 4 is a schematic diagram of the fixed end structure of the fiber in place sensor of the present invention;
FIG. 5 is a schematic diagram of a fiber collimator according to the present invention;
FIG. 6 is a schematic view of the working distance of the fiber-to-the-place sensor of the present invention.
The system comprises a demodulation module 1, a laser light source 2, a photoelectric detector 3, an electric signal output end 4, an upper cover 5, an optical fiber in-place sensor 6, a multi-core optical fiber connector 7, a transmission optical fiber 8, a measured moving object 9, a collimator connecting optical fiber 10, a sensor moving end 11, a sensor fixed end 12, a magnet 13, a fixed end shell 14, an optical fiber collimator 15, a collimator left section probe 15.1, a collimator right section probe 15.2, a collimator fixed support 16, a collimator left section mounting hole 16.1, a collimator right section mounting hole 16.2, a spring sheet shielding groove 16.3, a magnetic metal spring sheet 17.1, a fixed end 17.2 and a collimator laser signal shielding end.
Detailed Description
The invention is described in further detail below with reference to the following figures and examples:
the invention relates to an optical fiber in-place sensor, as shown in figures 2-6, which comprises a sensor fixed end 12 and a sensor movable end 11, wherein the sensor fixed end comprises a fixed end shell 14, an optical fiber collimator 15, a collimator fixed support 16 and a magnetic metal elastic sheet 17, the collimator fixed support 16 is arranged in the fixed end shell 14, the collimator fixed support 16 is provided with a collimator left section mounting hole 16.1, a collimator right section mounting hole 16.2 and an elastic sheet shielding groove 16.3, the elastic sheet shielding groove 16.3 is positioned between the collimator left section probe mounting hole 16.1 and the collimator right section probe mounting hole 16.2, the fixed end 17.1 of the magnetic metal elastic sheet 17 is fixed on the collimator fixed support 16, the collimator laser signal shielding end 17.2 of the magnetic metal elastic sheet 17 is positioned in the elastic sheet shielding groove 16.3, the collimator left section probe 15.1 of the optical fiber collimator 15 is arranged in the collimator left section probe mounting hole 16.1, a right section of collimator probe 15.2 of the optical fiber collimator 15 is installed in a right section of collimator installation hole 16.2, and a collimator laser signal shielding end 17.2 of the magnetic metal elastic sheet 17 can shield between the left section of collimator probe 15.1 and the right section of collimator probe 15.2; the sensor moving end 11 is provided with a magnet 13, and the magnet 13 can suck up the collimator laser signal shielding end 17.2 of the magnetic metal elastic sheet 17 when the relative position between the sensor moving end 11 and the sensor fixing end 12 is in a in-place state, so that laser signals between the collimator left section probe 15.1 and the collimator right section probe 15.2 are conducted, and an in-place signal is triggered.
In the technical scheme, the sensor fixing end 12 is arranged at the in-place detection fixing station, and the sensor moving end 11 is arranged on the moving object 9 to be detected. The magnetic metal spring 17 in the fixed end 12 of the sensor is small in size and light in weight, and when attracted by the magnet 13, can generate elastic deformation along the direction of stress. When the attraction force of the magnet 13 exceeds the working range, the magnetic metal elastic sheet 17 will quickly recover the original shape.
In the technical scheme, the left section of the collimator 15.1 and the right section of the collimator 15.2 are coaxially arranged.
In the above technical solution, the sensor fixing end further includes an upper cover 5, and the upper cover 5 is used for sealing the fixing end housing 14.
In the above technical solution, the magnet 13 is a neodymium iron boron magnet, the magnetic metal elastic sheet 17 is high manganese steel, and the size of the magnet 13 is 60x20x10, and the unit is mm; the length of the magnetic metal elastic sheet 17 is 40mm, and the thickness is 0.2 mm; in the configuration shown in FIG. 6; the distance L between the fixed end 12 of the sensor and the movable end 11 of the sensor is 10mm, the distance between the corresponding ends of the fixed end 12 of the sensor and the movable end 11 of the sensor is 30-40 mm from the alignment state, and the fixed end 12 of the sensor and the movable end 11 of the sensor are in the in-place state until the fixed end 12 of the sensor and the movable end 11 of the sensor are in the alignment state, and at the moment, the magnet 13 can attract the magnetic metal elastic sheet 17.
An optical fiber in-place sensing system based on the sensor is shown in fig. 1 and comprises a demodulation module 1, a multi-core optical fiber connector 7 and an optical fiber in-place sensor 6, wherein the demodulation module 1 comprises a laser light source 2 and a photoelectric detector 3, a laser signal output end of the laser light source 2 is connected with a collimator left section probe 15.1 of an optical fiber collimator 15 in the optical fiber in-place sensor 6 sequentially through a transmission optical fiber 8 and the multi-core optical fiber connector 7, a collimator right section probe 15.2 of the optical fiber collimator 15 in the optical fiber in-place sensor 6 is connected with an optical signal detection end of the photoelectric detector 3 sequentially through the multi-core optical fiber connector 7 and the transmission optical fiber 8, and an electrical signal output end 4 of the photoelectric detector 3 is used for outputting an electrical signal whether the optical fiber is in place or not.
In the above technical scheme, the laser signal output by the laser light source 2 is divided into four paths and enters the multi-core optical fiber connector 7 through the transmission optical fiber 8, the four paths of laser in the multi-core optical fiber connector 7 are the laser signal sent by the light source 2, the other four paths of laser are the four paths of laser signal returned after the laser signal passes through the optical fiber in-place sensor 6, the received four paths of laser respectively enter the four paths of photoelectric detectors 3 through the multi-core optical fiber connector 7 and the transmission optical fiber 8, and the multi-core optical fiber connector 7 can be used for realizing the transmission of the remote and stable optical signal.
In the technical scheme, the light intensity range of the output laser of the laser light source 2 is 8-9 dBm (the output power range of a common laser), after the output laser is averagely divided into four paths through a branching unit, the light intensity range of each path of laser signal is 2-3 dBm, the light intensity of each path of returned signal detected by the photoelectric detector 3 is-5-4 dBm, because the collimator 15 has light loss in the optical coupling process, the light loss obtained through the test is in the range of 5-6 dB, meanwhile, the light output by the laser light source 2 has insertion loss in the transmission process through the multi-core optical fiber connector 7, the numerical value is within 1-2 dB, and the light intensity of the returned light signal is-5-4 dBm after the returned light signal enters the photoelectric detector 3.
In the above technical solution, the optical fiber collimator 15 is used for converting the transmitted light in the optical fiber into collimated light within a certain working distance, and coupling the collimated light into the optical fiber collimator 15 at the other end. The collimator fixing support is used for aligning the two optical fiber collimators 15, so that the transmission loss of light is reduced, and the transmission of the optical fiber collimators 15 is not influenced in a vibration environment. The magnetic metal spring piece 17 is used for controlling the on-off of the transmitted light in the optical fiber collimator 15. When the mobile device in the device to be measured does not reach the designated position, the metal elastic sheet 17 in the fixed end 12 of the sensor just covers the middle of the working distance of the two optical fiber collimators 15, and the transmission of light is blocked. When the moving device in the device under test reaches the designated position, the metal elastic sheet 17 in the fixed end 12 of the sensor is attracted by the magnet 13 in the moving end 11 of the sensor and bounces upwards, and the light path in the fiber collimator 15 is conducted. The photodetector 3 in the demodulation module 1 detects the optical pulse signal, and then converts the optical pulse signal into an electrical signal for output. The optical fiber collimators 15 are respectively provided with a collimator connecting optical fiber 10 to realize the leading-in and leading-out of high signals of the optical fiber collimators 15.
A method for detecting in-place by using the system is characterized by comprising the following steps:
step 1: the fixed end 12 of the sensor is arranged at the in-place detection fixing station, and the movable end 11 of the sensor is arranged on the moving object 9 to be detected;
step 2: the laser signal output by the laser source 2 is transmitted to a left section of a collimator probe 15.1 of an optical fiber collimator 15 in an optical fiber in-place sensor 6 sequentially through a transmission optical fiber 8 and a multi-core optical fiber connector 7, at the moment, a sensor moving end 11 on a moving object 9 to be detected is not in a in-place state relative to a sensor fixed end 12, the left section of the collimator probe 15.1 and a right section of the collimator probe 15.2 are separated by a collimator laser signal shielding end 17.2 of a magnetic metal elastic sheet 17, the laser signal cannot be conducted, and the photoelectric detector 3 cannot receive the returned laser signal;
and step 3: when the sensor moving end 11 moves to the in-place state position relative to the sensor fixing end 12, the magnet 13 on the sensor moving end 11 absorbs the collimator laser signal shielding end 17.2 of the magnetic metal elastic sheet 17, at the moment, the laser signal between the collimator left section probe 15.1 and the collimator right section probe 15.2 is conducted, the returned laser signal enters the photoelectric detector 3 through the multi-core optical fiber connector 7 and the transmission optical fiber 8, and the photoelectric detector 3 is triggered to be in-place electric signals.
Details not described in this specification are within the skill of the art that are well known to those skilled in the art.
Claims (4)
1. An in-place detection method using an optical fiber in-place sensing system based on an optical fiber in-place sensor is characterized in that: the optical fiber in-place sensor comprises a sensor fixed end (12) and a sensor moving end (11), wherein the sensor fixed end comprises a fixed end shell (14), an optical fiber collimator (15), a collimator fixed support (16) and a magnetic metal elastic sheet (17), the collimator fixed support (16) is installed in the fixed end shell (14), a collimator left section installation hole (16.1), a collimator right section installation hole (16.2) and an elastic sheet shielding groove (16.3) are formed in the collimator fixed support (16), the elastic sheet shielding groove (16.3) is positioned between a collimator left section probe installation hole (16.1) and a collimator right section probe installation hole (16.2), a fixed end (17.1) of the magnetic metal elastic sheet (17) is fixed on the collimator fixed support (16), a collimator laser signal shielding end (17.2) of the magnetic metal elastic sheet (17) is positioned in the elastic sheet shielding groove (16.3), a left collimator section probe (15.1) of the optical fiber collimator (15) is installed in a left collimator section probe installation hole (16.1), a right collimator section probe (15.2) of the optical fiber collimator (15) is installed in a right collimator section installation hole (16.2), and a collimator laser signal shielding end (17.2) of a magnetic metal elastic sheet (17) can shield between the left collimator section probe (15.1) and the right collimator section probe (15.2); the sensor moving end (11) is provided with a magnet (13), and the magnet (13) can suck up a collimator laser signal shielding end (17.2) of the magnetic metal elastic sheet (17) when the relative position between the sensor moving end (11) and the sensor fixing end (12) is in a in-place state, so that laser signals between the left section probe (15.1) of the collimator and the right section probe (15.2) of the collimator are conducted;
the optical fiber in-place sensing system comprises a demodulation module (1), a multi-core optical fiber connector (7) and an optical fiber in-place sensor (6), wherein the demodulation module (1) comprises a laser light source (2) and a photoelectric detector (3), the laser signal output end of the laser light source (2) is connected with a left section probe (15.1) of a collimator of an optical fiber collimator (15) in the optical fiber in-place sensor (6) sequentially through a transmission optical fiber (8) and the multi-core optical fiber connector (7), a right section probe (15.2) of the collimator of the optical fiber collimator (15) in the optical fiber in-place sensor (6) is connected with the optical signal detection end of the photoelectric detector (3) sequentially through the multi-core optical fiber connector (7) and the transmission optical fiber (8), and the electric signal output end (4) of the photoelectric detector (3) is used for outputting an electric signal whether the optical signal is in place or not;
laser signals output by a laser light source (2) are divided into four paths and enter a multi-core optical fiber connector (7) through a transmission optical fiber (8), four paths of laser in the multi-core optical fiber connector (7) are laser signals sent by the light source (2), the other four paths of laser are four paths of laser signals returned after the laser signals pass through an optical fiber in-place sensor (6), and the received four paths of laser enter a four-path optical detector (3) through the multi-core optical fiber connector (7) and the transmission optical fiber (8) respectively;
the light intensity range of the output laser of the laser light source (2) is 8-9 dBm, after the output laser is divided into four paths, the light intensity range of each path of laser signal is 2-3 dBm, and the light intensity of each path of returned signal detected by the photoelectric detector (3) is-5-4 dBm;
the corresponding ends of the fixed end (12) and the movable end (11) of the sensor are 30-40 mm away from the alignment state until the fixed end (12) and the movable end (11) of the sensor are in the in-place state, and the magnet (13) can attract the magnetic metal elastic sheet (17);
the left section of the collimator probe (15.1) and the right section of the collimator probe (15.2) are coaxially arranged;
the optical fiber collimator (15) is used for converting transmission light in an optical fiber into quasi light within a certain working distance, the quasi light is coupled into the optical fiber collimator (15) at the other end, the collimator fixing support is used for aligning the two optical fiber collimators (15), the transmission loss of the light is reduced, and the transmission of the optical fiber collimator (15) is not influenced under the vibration environment, the magnetic metal elastic sheet (17) is used for controlling the on-off of the transmission light in the optical fiber collimator (15), when a mobile device in equipment to be tested does not reach a specified position, the metal elastic sheet (17) in the sensor fixing end (12) is just shielded between the working distances of the two optical fiber collimators (15) to block the transmission of the light, when the mobile device in the equipment to be tested reaches the specified position, the metal elastic sheet (17) in the sensor fixing end (12) is upwards bounced due to the attraction of the magnet (13) in the sensor moving end (11), at the moment, the light path in the optical fiber collimator (15) is conducted, the photoelectric detector (3) in the demodulation module (1) detects the optical pulse signal and further converts the optical pulse signal into an electric signal to be output, and the optical fiber collimators (15) are provided with collimator connecting optical fibers (10) to realize the leading-in and leading-out of the optical fiber collimator (15) signal;
the in-place detection method comprises the following steps:
step 1: the fixed end (12) of the sensor is arranged at the in-place detection fixed station, and the movable end (11) of the sensor is arranged on the moving object (9) to be detected;
step 2: laser signals output by the laser light source (2) are transmitted to a collimator left section probe (15.1) of an optical fiber collimator (15) in an optical fiber in-place sensor (6) sequentially through a transmission optical fiber (8) and a multi-core optical fiber connector (7), at the moment, a sensor moving end (11) on a detected moving object (9) is not in a in-place state relative to a sensor fixing end (12), the collimator left section probe (15.1) and a collimator right section probe (15.2) are separated by a collimator laser signal blocking end (17.2) of a magnetic metal elastic sheet (17), the laser signals cannot be conducted, and a photoelectric detector (3) cannot receive returned laser signals;
and step 3: when the sensor moving end (11) moves to the in-place state position relative to the sensor fixing end (12), the magnet (13) on the sensor moving end (11) sucks up the collimator laser signal shielding end (17.2) of the magnetic metal elastic sheet (17), at the moment, a laser signal between the collimator left section probe (15.1) and the collimator right section probe (15.2) is conducted, and the returned laser signal enters the photoelectric detector (3) through the multi-core optical fiber connector (7) and the transmission optical fiber (8), so that the photoelectric detector (3) triggers an in-place signal.
2. The in-place detection method according to claim 1, characterized in that: the sensor fixing end (12) is arranged at the in-place detection fixing station, and the sensor moving end (11) is arranged on the moving object (9) to be detected.
3. The in-place detection method according to claim 1, characterized in that: the sensor fixed end further comprises an upper cover (5), and the upper cover (5) is used for sealing the fixed end shell (14).
4. The in-place detection method according to claim 1, characterized in that: the magnet (13) is a neodymium iron boron magnet, and the magnetic metal elastic sheet (17) is made of high manganese steel.
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| JPS55111905A (en) * | 1979-02-21 | 1980-08-29 | Fujitsu Ltd | Photo switch |
| JPS57192902A (en) * | 1981-05-25 | 1982-11-27 | Kobishi Denki Kk | Optical switch |
| FR2618914B1 (en) * | 1987-07-31 | 1991-12-06 | Alain Souloumiac | IMPROVEMENTS TO OPTOMAGNETIC SWITCHES |
| JPS6459208A (en) * | 1987-08-31 | 1989-03-06 | Yamatake Honeywell Co Ltd | Optical switch |
| WO2002070987A1 (en) * | 2001-03-01 | 2002-09-12 | Corning Incorporated | System and method of aligning two optical axis towards each other |
| CN2479487Y (en) * | 2001-05-22 | 2002-02-27 | 武汉理工大学 | Magnetic coupled fibre-optical liquid level alarm |
| CN107179558A (en) * | 2016-03-10 | 2017-09-19 | 中兴通讯股份有限公司 | A kind of monitoring device, system and method |
| CN107589491B (en) * | 2016-07-08 | 2019-10-11 | 上海大学 | Buoyancy-type fiber switch |
| CN106289166A (en) * | 2016-07-18 | 2017-01-04 | 武汉理工大学 | A kind of optical fiber obliquity sensor and wavelength-division multiplex method thereof |
| CN206683687U (en) * | 2017-04-19 | 2017-11-28 | 武汉理工大学 | The Gear Root condition monitoring system of Fabry-perot optical fiber chamber and grating multiplied sensor |
| CN208765668U (en) * | 2018-09-30 | 2019-04-19 | 南京南瑞继保电气有限公司 | A kind of fiber position detection system |
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