CN110726492A - Fiber grating sensing and monitoring system for measuring temperature and vibration of train bearing - Google Patents
Fiber grating sensing and monitoring system for measuring temperature and vibration of train bearing Download PDFInfo
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- CN110726492A CN110726492A CN201810778154.1A CN201810778154A CN110726492A CN 110726492 A CN110726492 A CN 110726492A CN 201810778154 A CN201810778154 A CN 201810778154A CN 110726492 A CN110726492 A CN 110726492A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
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- General Physics & Mathematics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The invention discloses a fiber bragg grating sensing and monitoring system for measuring the temperature and vibration of a train bearing, and belongs to the technical field of fiber sensing. A fiber grating sensor monitoring system for train bearing temperature and vibration measurement, include the end cover and locate casing on the end cover, the end cover up end is equipped with the recess, be equipped with second fiber grating in the recess for the temperature signal of perception testee takes place the drift, the level is equipped with the diaphragm in the cavity of casing, the both ends of diaphragm with the lateral wall fixed connection of casing, the center department of diaphragm is equipped with first fiber grating for the vibration signal of perception testee takes place the drift, one side of casing is equipped with fiber grating demodulating equipment, is used for right the drift volume demodulates in order to realize the real-time supervision to testee vibration and temperature. The invention has the advantages of simple structure, convenient installation, high temperature sensitivity, good vibration measurement and temperature measurement results and the like.
Description
Technical Field
The invention belongs to the technical field of optical fiber sensing, and particularly relates to an optical fiber grating sensor monitoring system for measuring the temperature and vibration of a train bearing.
Background
The fiber grating is a novel sensing element, overcomes the defects that the traditional electronic sensor is easily subjected to electromagnetic interference, has a complex structure and poor stability, cannot perform distributed measurement and remote long-term real-time monitoring and the like, and has the advantages of small volume, electromagnetic interference resistance, high precision, adaptability to various severe environments and the like, and the fiber grating is widely researched and applied in recent years. The fiber grating sensor can realize direct measurement of physical quantities such as temperature, strain and the like. The wavelength of the fiber grating is sensitive to temperature and strain at the same time, namely the temperature and the strain simultaneously cause the coupling wavelength of the fiber grating to move, so that the temperature and the strain cannot be distinguished by measuring the coupling wavelength movement of the fiber grating. Therefore, the problem of cross sensitivity is solved, and the realization of the differential measurement of temperature and stress is the premise of the practical application of the sensor. The differential measurement of temperature and stress is achieved by determining the stress and temperature change by a certain technique. The basic principle of the technologies is that two or two sections of fiber gratings with different temperature and strain response sensitivity are utilized to form a double grating temperature and strain sensor, and the temperature and the strain are solved by utilizing two linear equations of two binary systems by determining the temperature and the strain response sensitivity coefficients of 2 fiber gratings.
In the working environment where vibration and temperature need to be measured simultaneously, part of the optical fiber sensors are used for measurement, and compared with the fiber grating sensors, the optical fiber sensors are easily affected by optical power fluctuation. In the prior art, chinese patent CN201310233052.9 relates to a quasi-distributed fiber sensor capable of measuring temperature and vibration simultaneously, and although this fiber grating sensor realizes simultaneous measurement of temperature and vibration and has a small size, the structure is difficult to realize, and no external sensitive structure is introduced to increase the strain of the grating, resulting in poor sensitivity, and there is a limitation to be used in a complicated and harsh working environment. Chinese patent CN201510003824.9 discloses a fiber grating two-dimensional vibration sensor with temperature compensation, including crossbeam and perpendicular roof beam, through the first fiber grating that sets up along perpendicular roof beam direction, third fiber grating and the fourth fiber grating of crossbeam direction are followed in the line, the vibration acceleration parameter of two directions that can real-time measurement mutually perpendicular, carry out temperature compensation to first fiber grating through the second fiber grating, adopt T type roof beam as the elastomer to realize vibration measurement, the resonant frequency and the sensitivity of sensor have been improved effectively, however, this patent can not realize simultaneously measuring and monitoring the vibration of testee and the while of temperature.
Disclosure of Invention
Aiming at the defects or the improvement requirements of the prior art, the invention provides a fiber grating sensing and monitoring system for measuring the temperature and the vibration of a train bearing, which aims to connect an end cover with an object to be measured, respectively sense the vibration and the temperature signal of the object to be measured through a first fiber grating arranged in the shell and a second fiber grating arranged in the center of the end cover, lead the central wavelengths of the first fiber grating and the second fiber grating to drift through the signal, test the drift amount, and demodulate the drift amount through a fiber grating demodulating device and a data processing device to realize the real-time and accurate monitoring of the vibration and the temperature of the object to be measured.
In order to solve the problems in the prior art, the following technical scheme is adopted.
A fiber grating sensing monitoring system for train bearing temperature and vibration measurement, include the end cover and locate casing on the end cover, its characterized in that: the utility model discloses a temperature measuring device for measuring the temperature of an object to be measured, including end cover, diaphragm, drift volume, first fiber grating, second fiber grating, optical fiber grating, end cover up end is equipped with the recess, be equipped with second fiber grating in the recess for the temperature signal of perception measured object and the drift takes place, the level is equipped with the diaphragm in the cavity of casing, the both ends of diaphragm with the lateral wall fixed connection of casing, the center department of diaphragm is equipped with first fiber grating for the vibration signal of perception measured object and the drift takes place, the outside of casing is equipped with fiber grating demodulating equipment, is used for right the drift volume demodulates in order to realize the real-time supervision to measured object vibration and temperature, second fiber grating is connected with the initiating terminal of optic fibre, optic fibre connects gradually second fiber grating first fiber grating with.
Furthermore, one end of the second fiber grating is adhered to the groove of the end cover through epoxy adhesive, and the other end of the second fiber grating is in a free state.
Further, the first fiber grating and the membrane are bonded through epoxy adhesive.
And the data processing device is connected with the fiber grating sensor through the fiber grating demodulation device.
Furthermore, the top of the shell is provided with an optical fiber outlet hole, and the optical fiber is led out through the optical fiber outlet hole.
Furthermore, an armored protective tube is arranged on the optical fiber outlet hole and used for protecting the optical fiber.
Further, the data processing device is directly embedded hardware and/or a software module executed by a processor.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
(1) the fiber grating sensing and monitoring system for measuring the temperature and the vibration of the train bearing is connected with an object to be measured through the end cover, the vibration and the temperature signals of the object to be measured are sensed through the first fiber grating arranged in the shell and the second fiber grating arranged in the center of the end cover respectively, the signals enable the center wavelengths of the first fiber grating and the second fiber grating to drift, the drift amount is tested, and the drift amount is demodulated through the fiber grating demodulating device and the data processing device, so that the vibration and the temperature of the object to be measured can be accurately monitored in real time.
(2) According to the fiber grating sensing and monitoring system for measuring the temperature and the vibration of the train bearing, the diaphragm is horizontally arranged in the cavity of the shell, the two ends of the diaphragm are fixedly connected with the side wall of the shell, the first fiber grating is arranged at the center of the diaphragm, and the diaphragm can vibrate along with a measured object to generate positive and negative alternative strain quantities and is sensed by the first fiber grating, so that the vibration of the monitored object is accurately monitored in real time.
(3) According to the fiber bragg grating sensing and monitoring system for measuring the temperature and the vibration of the train bearing, the groove is formed in the middle of the end cover, the second fiber bragg grating is arranged in the groove, one end of the second fiber bragg grating is adhered to the groove of the end cover through the epoxy adhesive, the other end of the second fiber bragg grating is in a free state, and the second fiber bragg grating senses the temperature of the end cover so as to achieve real-time and accurate monitoring of the surface temperature of a monitored object.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only schematic structural diagrams of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic diagram of a fiber grating sensing and monitoring system for measuring the temperature and vibration of a train bearing according to the invention.
In all the figures, the same reference numerals denote the same features, in particular: 1. an end cap; 1-1, a first threaded hole; 2. a housing; 2-1, an optical fiber outlet hole; 2-2, a second threaded hole; 3. a membrane; 4. a first fiber grating; 5. an optical fiber; 6. A second fiber grating; 7. a fiber grating demodulating device; 8. a data processing apparatus.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in figure 1, the fiber bragg grating sensing and monitoring system for measuring the temperature and the vibration of the train bearing comprises an end cover 1 and a shell 2, wherein the shell 2 is a cavity shell matched with the end cover 1. The end cover 1 is fixedly connected with the shell 2.
Preferably, the bottom of the end cap 1 is provided with a first threaded hole 1-1 for connecting with the monitored object. The bottom of the shell 2 is provided with a second threaded hole 2-2, and the end cover 1 is connected with the shell 2 through the threaded hole by adopting a bolt.
As shown in fig. 1, a groove is formed in the middle of the upper surface of the end cover 1, a second fiber grating 6 is arranged in the groove, one end of the second fiber grating 6 is adhered to the groove of the end cover 1 through an epoxy adhesive, the other end of the second fiber grating is in a free state, and the second fiber grating 6 senses the temperature of the end cover 1 to realize real-time monitoring of the surface temperature of the monitored object. When the external environment temperature changes, the end cover conducts the temperature, and the second fiber bragg grating 6 senses the temperature change.
Preferably, the configuration of the recess is cylindrical.
As shown in fig. 1, a diaphragm 3 is horizontally disposed in the cavity of the housing 2, and the diaphragm 3 is fixedly connected to the housing 2. The center of the diaphragm 3 is provided with the first fiber bragg grating 4, and the grid area of the first fiber bragg grating 4 is completely pasted and packaged on the diaphragm 3 and used for sensing positive and negative alternative strain generated by the vibration of the diaphragm 3, so that the vibration of a monitored object is monitored in real time.
Preferably, the first fiber grating 4 and the diaphragm 3 are bonded by epoxy adhesive.
As shown in fig. 1, the upper portion of the housing 2 is further provided with an optical fiber outlet 2-2, and the optical fiber outlet 2-2 penetrates through the housing 2. The starting end of the optical fiber 5 is connected with the second fiber grating 6 and then passes through the first fiber grating 4, and the tail fiber of the optical fiber 5 is led out through the optical fiber outlet hole 2-2 and connected with the fiber grating demodulating device 7. The fiber grating demodulating device 7 is connected with the data processing device 8 through a sensor, and demodulates the wavelength drift amount of the first fiber grating 4 and the second fiber grating 6 into specific numerical values of vibration signals and temperature signals, and the specific numerical values are displayed through the data processing device 8, so that vibration detection and temperature detection are realized.
Preferably, an armored protective tube is further disposed in the optical fiber outlet hole 2-1, and is used for protecting the optical fiber 5 when the optical fiber 5 is led out through the optical fiber outlet hole 2-1 of the housing 2. Further, the armor protection tube may be connected to the housing 2 by means of a thread, a bolt, an interference fit, welding, or the like.
Preferably, the data processing device 8 described in this embodiment may be directly embedded hardware, a software module executed by a processor, or a combination of the two, and the software module may be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium in the art.
Preferably, the storage medium is connectable to the data processing device 8 such that the data processing device 8 can read information from the storage medium and write information to the storage medium. Also, the storage medium may be integral to the data processing apparatus.
The invention relates to a fiber grating sensor monitoring system for measuring the temperature and vibration of a train bearing, which has the working principle that: when the external environment temperature of the monitored object changes, the temperature of the end cover also changes, the second fiber grating 6 senses the temperature change, so that the central wavelength of the second fiber grating 6 drifts, the signal is transmitted to the fiber grating demodulation device 7 and the data processing device 8 through the optical fiber 5, and the external environment temperature change is demodulated through the drift amount. When the monitored object vibrates, the shell 2 can vibrate along with the monitored object, the diaphragm 3 can vibrate along with the shell 2, at the moment, the diaphragm 3 can generate positive and negative alternate strain, the first fiber bragg grating 4 pasted on the diaphragm 3 senses the strain, further, the central wavelength of the first fiber bragg grating 4 drifts, the signal is transmitted to the fiber bragg grating demodulating device 7 and the data processing device 8 through the optical fiber 5, and the vibration frequency is demodulated through the drift amount. The vibration and the temperature of the detected structure can be monitored in real time through the change of the central wavelength of the first fiber grating 4 and the second fiber grating 6.
The fiber grating sensing monitoring system of the embodiment can be used for detecting vibration information and temperature information at the same time, and is applicable to wider working environment. In addition, the structure is simple, so that the installation and maintenance are convenient.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A fiber grating sensing monitoring system for train bearing temperature and vibration measurement, include end cover (1) and locate casing (2) on end cover (1), its characterized in that: the upper end surface of the end cover (1) is provided with a groove, a second fiber bragg grating (6) is arranged in the groove, used for sensing the temperature signal of the measured object and generating drift, a diaphragm (3) is horizontally arranged in the cavity of the shell (2), two ends of the diaphragm (3) are fixedly connected with the side wall of the shell (2), a first fiber bragg grating (4) is arranged at the center of the diaphragm (3), used for sensing the vibration signal of the measured object and generating drift, the outer side of the shell (2) is provided with a fiber grating demodulation device (7), used for demodulating the drift amount to realize real-time monitoring of the vibration and temperature of the measured object, the second fiber grating (6) is connected with the starting end of the optical fiber (5), and the optical fiber (5) is sequentially connected with the second fiber grating (6), the first fiber grating (4) and the fiber grating demodulation device (7).
2. The fiber grating sensing and monitoring system for train bearing temperature and vibration measurement according to claim 1, wherein: one end of the second fiber bragg grating (6) is adhered to the groove of the end cover (1) through epoxy adhesive, and the other end of the second fiber bragg grating is in a free state.
3. The fiber grating sensing and monitoring system for train bearing temperature and vibration measurement according to claim 1, wherein: the first fiber grating (4) is bonded with the diaphragm (3) through epoxy adhesive.
4. The fiber grating sensing and monitoring system for train bearing temperature and vibration measurement according to claim 1, wherein: the fiber bragg grating sensor further comprises a data processing device (8), and the data processing device (8) is connected with the fiber bragg grating sensor through the fiber bragg grating demodulating device (7).
5. The fiber grating sensing and monitoring system for train bearing temperature and vibration measurement according to claim 1, wherein: an optical fiber outlet hole (2-2) is formed in the top of the shell (2), and the optical fiber (5) is led out through the optical fiber outlet hole (2-2).
6. The fiber grating sensing and monitoring system for train bearing temperature and vibration measurement according to claim 5, wherein: and an armored protective pipe is arranged on the optical fiber outlet hole (2-2) and used for protecting the optical fiber (5).
7. The fiber grating sensing and monitoring system for train bearing temperature and vibration measurement according to any one of claims 1-5, wherein: the data processing device (8) is directly embedded hardware and/or a software module executed by a processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810778154.1A CN110726492A (en) | 2018-07-16 | 2018-07-16 | Fiber grating sensing and monitoring system for measuring temperature and vibration of train bearing |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810778154.1A CN110726492A (en) | 2018-07-16 | 2018-07-16 | Fiber grating sensing and monitoring system for measuring temperature and vibration of train bearing |
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| CN110726492A true CN110726492A (en) | 2020-01-24 |
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| CN201810778154.1A Pending CN110726492A (en) | 2018-07-16 | 2018-07-16 | Fiber grating sensing and monitoring system for measuring temperature and vibration of train bearing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116818025A (en) * | 2023-08-31 | 2023-09-29 | 武汉理工大学 | Step metal coating fiber bragg grating high-temperature vibration composite sensor and monitoring method |
-
2018
- 2018-07-16 CN CN201810778154.1A patent/CN110726492A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116818025A (en) * | 2023-08-31 | 2023-09-29 | 武汉理工大学 | Step metal coating fiber bragg grating high-temperature vibration composite sensor and monitoring method |
| CN116818025B (en) * | 2023-08-31 | 2023-11-24 | 武汉理工大学 | Step metal coating fiber bragg grating high-temperature vibration composite sensor and monitoring method |
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