CN207487849U - A kind of grating Multifunction Sensor used under extreme low temperature environment - Google Patents
A kind of grating Multifunction Sensor used under extreme low temperature environment Download PDFInfo
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- CN207487849U CN207487849U CN201720865352.2U CN201720865352U CN207487849U CN 207487849 U CN207487849 U CN 207487849U CN 201720865352 U CN201720865352 U CN 201720865352U CN 207487849 U CN207487849 U CN 207487849U
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Abstract
The grating Multifunction Sensor that (77K~4.2K) is used under extreme low temperature environment the utility model discloses one kind, including multiple bragg gratings for being carved with different initial wavelengths, the optical signal of multiple bragg gratings is pooled to output optical fibre by fiber splitter, multiple bragg gratings are located on two-dimensional surface or in three dimensions, for measuring and monitoring multi-direction strain and temperature including plane and cambered surface, the multi-direction strain in space three-dimensional direction and the multi-direction strain of temperature and structure/material internal and temperature.The utility model overcomes under extreme low temperature environment (77K~4.2K) poor mechanical property of Bragg optical-fiber grating sensor, measuring method of complicated multi-direction, more physical quantitys and the deficiencies of can not achieve the strain and temperature survey in space three-dimensional direction in the prior art, realizes in multi-functional advantages such as extreme low temperature environment lower plane and cambered surface, the synchro measure of the multi-direction strain of space three-dimensional direction and structure/material internal and temperature and monitorings.
Description
Technical field
The present invention relates to sensor technical field, specifically a kind of more work(of grating used under extreme low temperature environment
It can sensor.
Background technology
Bragg optical-fiber grating sensor, belongs to one kind of fibre optical sensor, and sensing process is to pass through external physical quantity
Heat transfer agent is obtained, it can be achieved that direct measurement to physical quantitys such as temperature, strains to the modulation of bragg grating wavelength.
In the prior art, Bragg optical-fiber grating sensor carries out single direction, list mainly for by geodesic structure or material
The measurement or monitoring of one physical quantity, use temperature range is mostly in more than 77K, and with structure or the physical quantity of material surface
Based on.In conclusion under extreme low temperature environment (77K~4.2K), in the implementation of the present invention, inventor has found existing
At least there are following defects in technology：
(1) strain in space three-dimensional direction and structure/material internal and the measurement of temperature and monitoring be can not achieve：Extreme
Under low temperature environment (77K~4.2K), current Bragg optical-fiber grating sensor carries out single just for structure/material surface
One direction, the measurement of single one physical amount, it is impossible to realize the strain in space three-dimensional direction and structure/material internal and the measurement of temperature
And monitoring；
(2) mechanical property of (77K~4.2K) bragg grating is bad under extreme low temperature environment：At present with Prague
Strain and temperature sensor based on fiber grating sensing technology, the temperature range used mostly in more than 77K, but
Under extreme low temperature environment (77K~4.2K), since bragg grating sheet is as fragile material, while use extremely low
The poor coating material (or encapsulating material) of (77K~4.2K) mechanical property, can lead to bragg grating under warm environment
There is " multi-peaks phenomenon " or even can damage bragg grating in demodulated signal.
(3) method of the synchro measure and monitoring of complicated multi-direction, more physical quantitys：Under extreme low temperature environment (77K~
Under 4.2K), current Bragg optical-fiber grating sensor is to realize the measurement of multi-direction and more physical quantity or prison at " fixed point "
It surveys, generally using following two modes：
One kind is that (only there are one Bragg gratings on an optical fiber with multiple single-point type Bragg optical-fiber grating sensors
Sensor) coordinate/be applied in combination, it is mounted on testee surface at different angles respectively, for measuring strain or temperature, but
This mode significantly increases the quantity of output optical fibre (being used for transmitting on optical signal to optical fibre interrogation instrument), gives experimental implementation band
It is greatly inconvenient to come；
Another way is with quasi-distributed fiber grating sensor, and the sensor of this structure is by multiple Prague
Grating sensor, at interval of a distance, is sequentially arranged on an optical fiber, the sensor of this structure is carrying out along optical fiber
" fixed point " is needed when measuring by its all bragg grating " curving movement " to " fixed point " position, but this way is not
But complicated optical fiber cabling can be led to, and very likely under extreme low temperature environment (77K~4.2K), due to optical fiber
" curving radius " is too small and destroys optical fiber, and great inconvenience is brought to experimental implementation；
In addition, in the case where becoming low temperature environment, current Bragg optical-fiber grating sensor is when carrying out strain measurement or monitoring
It needs to carry out temperature-compensating, this brings great inconvenience for experimental implementation again.
Invention content
The purpose of the present invention is to overcome the above shortcomings and to provide one kind (77K~4.2K) under extreme low temperature environment to make
Grating Multifunction Sensor can not only work, and can realize two dimension under extreme low temperature environment (77K~4.2K)
Multi-direction, multi-angle strain and the measurement of temperature and monitoring on face or in three dimensions.
The object of the present invention is achieved like this：One kind grating that (77K~4.2K) is used under extreme low temperature environment is more
Function sensor, including multiple bragg gratings for being carved with different initial wavelengths, the light of multiple bragg gratings is believed
Number output optical fibre is pooled to by fiber splitter, multiple bragg gratings are located on two-dimensional surface or in three dimensions, more
A bragg grating uses the organic polymer of mechanics better performances under extreme low temperature to carry out coating or on this coating basis
It is upper to be further packaged using other materials, enhance bragg grating (77K~4.2K) under extreme low temperature environment
Mechanical property, enable under extreme low temperature environment (77K~4.2K) normal work.
Further, multiple bragg gratings are located at the sensor that two-dimensional structure is formed on two-dimensional surface, and two-dimensional structure is
Refer to each bragg grating different directions on same two dimensional surface or cambered surface to be distributed, between each bragg grating
Angle adjustable size, the sensor of two-dimensional structure is used to measure and monitor multi-direction strain and the temperature of plane.
Further, multiple bragg gratings are located at the sensor that three-dimensional structure is formed in three dimensions, three-dimensional structure
Refer to that each bragg grating different directions in three dimensions are distributed, the angle between each bragg grating can
Adjusting size, the sensor of three-dimensional structure are used to measure and monitor multi-direction strain and the temperature in space three-dimensional direction.
Further, the sensor of two-dimensional structure is fixed on superconducting magnet coil (or superconductor) surface, for measure and
Hoop strain, axial strain and the temperature of coil surface (or material surface) are monitored, the sensor of three-dimensional structure is fixed on superconduction
On magnet coil (or superconductor), for measuring and monitoring coil (or material) hoop strain, axial strain and radial strain.
The advantage of the invention is that：Under extreme low temperature environment (77K~4.2K), the present invention overcomes cloth in the prior art
The poor mechanical property of glug fiber grating, the complicated synchro measure of multi-direction, more physical quantitys and the method for monitoring and cannot
Realize the deficiency of the strain in space three-dimensional direction and measurement and the monitoring of temperature, realize under extreme low temperature environment (77K~
The multi-direction strain and temperature of plane and cambered surface 4.2K), the multi-direction strain in space three-dimensional direction and temperature and structure/material
The multi-functional advantages such as measurement, monitoring and the data acquisition of multi-direction strain and temperature inside material, and easy to implement, experiment behaviour
Make simple.
Description of the drawings
Fig. 1 is the structural representation of grating Multifunction Sensor two-dimensional structure used under the extreme low temperature environment of the present invention
Figure；
Fig. 2 is the structural representation of grating Multifunction Sensor three-dimensional structure used under the extreme low temperature environment of the present invention
Figure；
Fig. 3 is that the grating Multifunction Sensor used under the extreme low temperature environment of the present invention is mounted on superconducting magnet coil
Structure diagram.
Wherein, 1- output optical fibres；2- bragg gratings；3- encapsulating materials；4- fiber splitters.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings, the cloth that the grating Multifunction Sensor in embodiment is included
Glug fiber grating can incessantly there are three, user can increase or decrease the number of bragg grating according to actual demand
Amount, embodiment for convenience's sake, only by taking three bragg gratings as an example.
Embodiment 1
A kind of two-dimensional structure grating Multifunction Sensor used under extreme low temperature environment
As shown in Figure 1, the bragg grating for being carved with different initial wavelengths including three, each bragg fiber light
The organic polymer of grid mechanics better performances under extreme low temperature carries out coating or is further sealed on the basis of this coating
Dress, the optical signal of three bragg gratings is pooled to output optical fibre by fiber splitter, by three Prague light
Fine grating forms two-dimensional structure on two-dimensional surface and integrates, and two-dimensional structure refers to each bragg grating same two
Different directions are distributed on dimensional plane or cambered surface, and the angle between each bragg grating can be according to experiment or the need of engineering
It gives, the sensor of the two-dimensional structure of the present embodiment is used to measure and monitor multi-direction strain and the temperature of plane.
In addition three bragg gratings both can be used all as strain or temperature sensor, can also choose it
In some bragg gratings used as strain transducer, remaining, which is used in mixed way as temperature sensor, (or is used for
Measure temperature or for temperature-compensating), to realize the synchro measure of more physical quantitys and monitoring.
Embodiment 2
A kind of three-dimensional structure grating Multifunction Sensor used under extreme low temperature environment
As shown in Figure 2, the bragg grating for being carved with different initial wavelengths including three, each bragg fiber light
The organic polymer of grid mechanics better performances under extreme low temperature carries out coating or is further sealed on the basis of this coating
Dress, the optical signal of three bragg gratings is pooled to output optical fibre by fiber splitter, by three Prague light
Fine grating forms three-dimensional structure on three-dimensional surface and integrates, and three-dimensional structure refers to each bragg grating in three-dimensional space
Interior different directions are distributed, and the angle between each bragg grating can give according to the needs of experiment or engineering, this
The sensor of the three-dimensional structure of embodiment is used to measure and monitor multi-direction strain and the temperature in space three-dimensional direction.
In addition, the bragg grating of the grating Multifunction Sensor of the present embodiment both can be all as strain or temperature
Sensor uses, and can also choose some of which and be used as strain transducer, remaining makes as temperature sensor mixing
With (or for measure temperature or for temperature-compensating), to realize the synchro measure of more physical quantitys and monitoring.
Embodiment 3
A kind of grating Multifunction Sensor used under extreme low temperature environment under high-intensity magnetic field, ultra-low temperature surroundings (77K~
4.2K) to superconducting magnet strain and the measurement of temperature.
As shown in Figure 3, sensor and three-dimensional structure of the sensor in superconducting magnet including two-dimensional structure are arranged on
Sensing, wherein the angle between the three of the sensor of two-dimensional structure bragg grating is 45 degree, and is located at same cambered surface,
The cambered surface and the cambered surface of superconducting magnet coil are coincide, and one of bragg grating is made vertically to set, for surveying
The axial strain of amount and monitoring coil surface, a bragg grating is circumferentially set, for measuring and monitoring coil table
The hoop strain in face, another bragg grating are used to measure and monitor the temperature of coil surface；In addition three-dimensional structure
Orthogonal setting two-by-two between three bragg gratings of sensor, makes one of bragg grating along superconduction
It is diametrically disposed on magnet coil, for measuring and monitoring the radial strain on coil, a bragg grating edge
Superconducting magnet coil upper outer surface vertical direction is distributed, for measuring and monitoring the axial strain on coil, the last one Bradley
Lattice fiber grating is arranged circumferentially along superconducting magnet coil, for measuring and monitoring the hoop strain on coil；Finally by defeated
Go out optical fiber by the optical signal transmission of two grating Multifunction Sensors to optical fiber analytical engine, complete the acquisition of data.
Finally it should be noted that：Obviously, above-described embodiment is only intended to clearly illustrate the application example, and simultaneously
The non-restriction to embodiment.For those of ordinary skill in the art, it can also do on the basis of the above description
Go out other various forms of variations or variation.There is no necessity and possibility to exhaust all the enbodiments.And thus drawn
Among the obvious changes or variations that Shen goes out are still in the protection domain of the application type.
Claims (8)
1. a kind of grating Multifunction Sensor used under extreme low temperature environment, which is characterized in that be carved with difference including multiple
The bragg grating of initial wavelength, the optical signals of multiple bragg gratings are pooled to defeated by fiber splitter
Go out optical fiber, multiple bragg gratings are located on two-dimensional surface or in three dimensions；Multiple bragg gratings
For the fiber grating after the fiber grating of organic polymer coating or encapsulation.
2. a kind of grating Multifunction Sensor used under extreme low temperature environment according to claim 1, feature exist
In the organic polymer is organic polymer.
3. a kind of grating Multifunction Sensor used under extreme low temperature environment according to claim 1, feature exist
In multiple bragg gratings are located at the sensor that two-dimensional structure is formed on two-dimensional surface, and the two-dimensional structure refers to respectively
A bragg grating different directions on same two dimensional surface or cambered surface are distributed, between each bragg grating
Angle adjustable size.
4. a kind of grating Multifunction Sensor used under extreme low temperature environment according to claim 3, feature exist
In the sensor of the two-dimensional structure is used to measure and monitor multi-direction strain and the temperature of plane or cambered surface.
5. a kind of grating Multifunction Sensor used under extreme low temperature environment according to claim 1, feature exist
In multiple bragg gratings are located at the sensor that three-dimensional structure is formed in three dimensions, and the three-dimensional structure refers to
Each bragg grating different directions in three dimensions are distributed, and the angle between each bragg grating can
Adjusting size.
6. a kind of grating Multifunction Sensor used under extreme low temperature environment according to claim 5, feature exist
In the sensor of the three-dimensional structure is used to measure and monitor multi-direction strain and the temperature in space three-dimensional direction.
7. according to a kind of grating Multifunction Sensor used under extreme low temperature environment of 3 or 5 any one of them of claim,
It is characterized in that, the sensor of the two-dimensional structure is fixed on superconducting magnet coil or superconductor surface, for measuring and supervising
Hoop strain, axial strain and the temperature of test coil or material surface, the sensor of the three-dimensional structure are fixed on superconducting magnet
On coil or superconductor, for measuring and monitoring coil or material hoop strain, axial strain and radial strain.
8. a kind of grating Multifunction Sensor used under extreme low temperature environment according to claim 7, feature exist
In the grating Multifunction Sensor use temperature range is 77K~4.2K.
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| CN201720865352.2U CN207487849U (en) | 2017-07-17 | 2017-07-17 | A kind of grating Multifunction Sensor used under extreme low temperature environment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107356351A (en) * | 2017-07-17 | 2017-11-17 | 兰州大学 | A kind of grating flower Multifunction Sensor used under extreme low temperature environment |
| CN111537120A (en) * | 2020-06-03 | 2020-08-14 | 华北电力大学 | Fiber grating sensor for monitoring internal pressure of power transformer |
-
2017
- 2017-07-17 CN CN201720865352.2U patent/CN207487849U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107356351A (en) * | 2017-07-17 | 2017-11-17 | 兰州大学 | A kind of grating flower Multifunction Sensor used under extreme low temperature environment |
| CN111537120A (en) * | 2020-06-03 | 2020-08-14 | 华北电力大学 | Fiber grating sensor for monitoring internal pressure of power transformer |
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