CN110646115A - FBG temperature monitoring device for prestress extension of quenching heat exchanger - Google Patents
FBG temperature monitoring device for prestress extension of quenching heat exchanger Download PDFInfo
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- CN110646115A CN110646115A CN201910868731.0A CN201910868731A CN110646115A CN 110646115 A CN110646115 A CN 110646115A CN 201910868731 A CN201910868731 A CN 201910868731A CN 110646115 A CN110646115 A CN 110646115A
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- 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
- G01K11/3206—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 at discrete locations in the fibre, e.g. using Bragg scattering
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Abstract
The invention discloses a prestressed extension FBG temperature monitoring device of a quenching heat exchanger, which comprises a temperature fiber grating body and a fiber grating input tube, wherein the fiber grating input tube is arranged at the middle position of the end surface of the left end of the temperature fiber grating body, the fiber grating input tube is connected to the left end surface of the temperature fiber grating body through integral molding, a fiber grating input wire is arranged inside the fiber grating input tube, the right end of the fiber grating input wire is connected to the center of the left end surface of the temperature fiber grating body, the right end of the fiber grating input wire penetrates from the center of the left end surface of the temperature fiber grating body to the inside of the temperature fiber grating body, a traditional electromagnetic sensor needs to be calibrated at certain intervals manually when in use, and the fiber sensor does not need to be calibrated for the second time after leaving the factory, the reusability is strong, and the photoelectricity of the warrior is isolated, so that the warrior is safer to use.
Description
Technical Field
The invention belongs to the related technical field of petrochemical equipment, and particularly relates to a device for monitoring the prestress elongation FBG temperature of a quenching heat exchanger.
Background
When the rapid cooling heat exchanger is prestressed and elongated, the precision of the prestressed elongation can be ensured by the real-time online monitoring of the temperature in the heating process through local heating or flame gun heating, and the function is realized by arranging a traditional temperature sensor by manufacturers at present.
The prior temperature monitoring device technology has the following problems: the sensing sensitivity of the existing sensing technology is not high, the normal work can not be carried out under many special environments such as high voltage, large noise, high temperature, strong corrosiveness and the like, the sensitivity is low, the anti-electromagnetic interference capability is weak, the corrosion resistance, the high temperature and high pressure resistance and the electrical insulation property are general, and the existing sensing technology can not be directly connected with a computer.
Disclosure of Invention
The invention aims to provide a device for monitoring the prestressed elongation FBG temperature of a quenching heat exchanger, which aims to solve the problems that the sensing sensitivity of the prior sensing technology provided by the background technology is not high, the prior sensing technology can not normally work in many special environments such as high voltage, large noise, high temperature, strong corrosiveness and the like, the sensitivity is low, the anti-electromagnetic interference capability is weak, the device is corrosion-resistant, high-temperature and high-pressure resistant, the electrical insulation is common, and the device can not be directly connected with a computer.
In order to achieve the purpose, the invention provides the following technical scheme:
a FBG temperature monitoring device for prestress extension of a quenching heat exchanger comprises a temperature fiber grating body and a fiber grating input tube, wherein the fiber grating input tube is arranged at the middle position of the left end face of the temperature fiber grating body, the fiber grating input tube is connected to the left end face of the temperature fiber grating body through integral forming, a fiber grating input wire is arranged inside the fiber grating input tube, the right end of the fiber grating input wire is connected to the center of the left end face of the temperature fiber grating body, the right end of the fiber grating input wire penetrates from the center of the left end face of the temperature fiber grating body to the inside of the temperature fiber grating body, a fiber grating input plug end is arranged at the left end of the fiber grating input wire, and the left end of the fiber grating input plug end penetrates through the center of the right end face of the fiber grating input plug end and is connected with the left end of the fiber grating input wire, the fiber grating temperature sensor is characterized in that a fiber grating output pipe is arranged at the middle position of the right end face of the temperature fiber grating body, the fiber grating output pipe is connected to the right end face of the temperature fiber grating body through integral molding, a fiber grating output wire is arranged inside the fiber grating output pipe, the left end of the fiber grating output wire is connected to the center of the right end face of the temperature fiber grating body, the left end of the fiber grating output wire penetrates through the temperature fiber grating body from the center of the right end face of the temperature fiber grating body to the inside of the temperature fiber grating body, a fiber grating output plug-in end is arranged at the right end of the fiber grating output wire, the right end of the fiber grating output plug-in end penetrates through the right end of the fiber grating output wire, and fiber grating positioning sleeves are arranged on the transverse cylindrical outer surfaces of the fiber grating input pipe and the fiber, the fiber grating positioning sleeve is sleeved outside the fiber grating input tube and the fiber grating output tube.
Preferably, the temperature fiber grating body comprises a protection layer, a cladding, a fiber core and a temperature fiber bragg grating, the right end of the fiber grating input wire is connected to the left end of the fiber core, the right end of the fiber core is connected to the left end of the fiber grating output wire, the cladding is arranged on the outer side of the transverse cylindrical outer surface of the fiber core, the cladding is sleeved on the fiber core, the temperature fiber bragg grating is arranged on the outer side of the transverse cylindrical outer surface of the fiber core between the fiber core and the cladding, the temperature fiber bragg grating is sleeved on the outer side of the fiber core, the protection layer is arranged on the outer side of the transverse cylindrical outer surface of the cladding, and the protection layer is sleeved on the cladding.
Preferably, the left end and the right end of the fiber core are required to be connected to the core bodies inside the fiber grating input wire and the fiber grating output wire in a seamless mode, and the material specifications of the core bodies inside the fiber grating input wire and the fiber grating output wire are consistent.
Preferably, the fiber grating positioning sleeve comprises a positioning bolt, a positioning sleeve, a protective soft cushion layer and a fixing bottom plate, the positioning sleeve is arranged on the outer surfaces of the transverse cylinders of the fiber grating input tube and the fiber grating output tube, the inner wall of the positioning sleeve is connected with the protective soft cushion layer through viscose, the protective soft cushion layer is attached to the outer surfaces of the fiber grating input tube and the fiber grating output tube, the bottom side of the positioning sleeve is fixedly connected with the fixing bottom plate through welding, the positioning bolt is inserted into the front side and the rear side of the fixing bottom plate at the top end of the positioning sleeve in a penetrating mode, and the positioning bolt can bolt and fix the fixing bottom plate under the action of force.
Preferably, the lengths of the fiber grating input wire and the fiber grating output wire are not fixed values, and the lengths of the fiber grating input wire and the fiber grating output wire can be increased or decreased according to actual use requirements.
Preferably, the inner walls of the fiber grating input tube and the fiber grating output tube are in fit with the outer walls of the fiber grating input wire and the fiber grating output wire, and the shape of the fiber grating input tube and the shape of the fiber grating output tube cannot be changed under the action of force within a limit range.
Preferably, the fiber grating positioning sleeves are provided with two groups, the size and the specification of the fiber grating positioning sleeves are consistent, the inner wall of the fiber grating positioning sleeve must be closely attached to the outer walls of the fiber grating input tube and the fiber grating output tube, and the fiber grating input tube and the fiber grating output tube cannot move left and right relative to the fiber grating positioning sleeve.
Preferably, the specification and material of the fiber grating input plugging end and the fiber grating output plugging end are consistent, and the fiber grating input plugging end and the fiber grating output plugging end need to be plugged into a temperature instrument to measure the temperature.
Compared with the prior art, the invention provides an FBG temperature monitoring device for the prestress elongation of a quenching heat exchanger, which has the following beneficial effects:
1. the fiber grating sensor is small in size, light in weight, capable of being designed into encapsulation of various modes, various in installation position, for example, designed into a slender type, capable of being installed in a narrow gap for fixing, strong in electromagnetic interference resistance, and more suitable for the severe occasions of electromagnetic environments compared with traditional electromagnetic sensors.
2. The wave crest multiplexing technology can enable a plurality of sensor signals to be transmitted from the same optical fiber, the occupation of a signal transmission line is greatly reduced, the transmission loss of optical signals in the optical fiber is extremely low, the distance between the sensor and a terminal can be greatly increased, the sensor has zero drift, the traditional electromagnetic sensor needs to be manually re-calibrated at a certain interval when in use, the optical fiber sensor does not need to be secondarily calibrated after leaving a factory, the reusability is strong, and the warrior photoelectricity is isolated and is safer in use.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention without limiting the invention in which:
FIG. 1 is a schematic view of the overall structure of a pre-stressed elongated FBG temperature monitoring device for a quenching heat exchanger according to the present invention;
FIG. 2 is a schematic structural diagram of an optical grating body in a pre-stressed elongated FBG temperature monitoring device for a quench heat exchanger according to the present invention;
FIG. 3 is a schematic diagram of the internal cross-sectional structure of a fiber grating in a pre-stressed elongated FBG temperature monitoring device for a quench heat exchanger according to the present invention;
FIG. 4 is a schematic side view of a positioning sleeve of a pre-stressed elongated FBG temperature monitoring device of a quenching heat exchanger according to the present invention;
in the figure: 1. the fiber bragg grating inputs the inserting end; 2. inputting a wire rod by the fiber bragg grating; 3. a fiber grating input tube; 4. a temperature fiber grating body; 5. a fiber grating positioning sleeve; 6. a fiber grating output tube; 7. fiber grating output wires; 8. an optical fiber grating output plug-in end; 41. a protective layer; 42. a cladding layer; 43. a fiber core; 43. a temperature fiber bragg grating; 51. positioning the bolt; 52. positioning the sleeve; 53. a protective cushion layer; 54. and fixing the bottom plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, the present invention provides a technical solution of a prestressed elongation FBG temperature monitoring device for a quench heat exchanger:
a FBG temperature monitoring device for prestress extension of a quenching heat exchanger comprises a temperature fiber grating body 4 and a fiber grating input tube 3, wherein the fiber grating input tube 3 is arranged at the middle position of the end face of the left end face of the temperature fiber grating body 4, the fiber grating input tube 3 is connected to the left end face of the temperature fiber grating body 4 through integral molding, a fiber grating input wire 2 is arranged inside the fiber grating input tube 3, the right end of the fiber grating input wire 2 is connected to the center of the left end face of the temperature fiber grating body 4, the right end of the fiber grating input wire 2 penetrates from the center of the left end face of the temperature fiber grating body 4 to the inside of the temperature fiber grating body 4, a fiber grating insertion end 1 is arranged at the left end of the fiber grating input wire 2, the left end of the fiber grating input insertion end 1 penetrates through the left end of the fiber grating input wire 2, the right end face of the temperature fiber grating body 4 is provided with a fiber grating output pipe 6 at the middle position of the end face, the fiber grating output pipe 6 is connected with the right end face of the temperature fiber grating body 4 through integral molding, a fiber grating output wire 7 is arranged inside the fiber grating output pipe 6, the left end of the fiber grating output wire 7 is connected with the center of the right end face of the temperature fiber grating body 4, the left end of the fiber grating output wire 7 penetrates from the center of the right end face of the temperature fiber grating body 4 to the inside of the temperature fiber grating body 4, the right end of the fiber grating output wire 7 is provided with a fiber grating output plug-in end 8, the right end of the fiber grating output plug-in end 8 penetrates through the center of the left end face and is connected with the right end of the fiber grating output wire 7, and the specification materials of the fiber grating input plug-in end 1, the fiber bragg grating input plugging end 1 and the fiber bragg grating output plugging end 8 need to be plugged into a temperature meter to measure the temperature.
The utility model provides a FBG temperature monitoring device of rapid cooling heat exchanger prestressing force extension, length including fiber grating input wire 2 and fiber grating output wire 7 is not the fixed value, the length of fiber grating input wire 2 and fiber grating output wire 7 can be prolonged or reduce according to the in-service use demand, the inner wall of fiber grating input tube 3 and fiber grating output tube 6 is the setting of laminating mutually with the outer wall of fiber grating input wire 2 and fiber grating output wire 7, the change of shape can not appear under the effect of power in the limit scope in fiber grating input tube 3 and fiber grating output tube 6.
The utility model provides a FBG temperature monitoring devices of rapid cooling heat exchanger prestressing force extension, include a FBG temperature monitoring devices of rapid cooling heat exchanger prestressing force extension, horizontal cylindricality surface department including fiber grating input tube 3 and fiber grating output tube 6 is provided with fiber grating position sleeve 5, fiber grating position sleeve 5 is provided with two sets ofly altogether, the size of fiber grating position sleeve 5, the specification and dimension is unanimous, the inner wall of fiber grating position sleeve 5 must be the setting of closely laminating mutually with the outer wall of fiber grating input tube 3 and fiber grating output tube 6, fiber grating input tube 3 and fiber grating output tube 6 can not remove about for fiber grating position sleeve 5.
A prestressed elongated FBG temperature monitoring device of a quenching heat exchanger comprises a fiber bragg grating locating sleeve 5 which is sleeved outside a fiber bragg grating input pipe 3 and a fiber bragg grating output pipe 6, the fiber bragg grating locating sleeve 5 comprises a locating bolt 51 and a locating sleeve 52, the fiber grating output tube 6 and the fiber grating input tube 3 are fixedly connected with the fixing bottom plate 54 through welding, the top end of the fixing bottom plate 54 is provided with a positioning bolt 51 in a penetrating and inserting mode at the front side and the rear side of the positioning sleeve 52, and the positioning bolt 51 can bolt and fix the fixing bottom plate 54 under the action of force.
A FBG temperature monitoring device for prestress elongation of a quenching heat exchanger comprises a temperature fiber bragg grating body 4, a protective layer 41, a cladding 42, a fiber core 43 and a temperature fiber bragg grating 44, wherein the right end of a fiber bragg grating input wire 2 is connected with the left end of the fiber core 43, the right end of the fiber core 43 is connected with the left end of a fiber bragg grating output wire 7, the cladding 42 is arranged on the outer side position of the transverse cylindrical outer surface of the fiber core 43, the fiber core 42 is sleeved with the fiber core 43, the temperature fiber bragg grating 44 is arranged on the outer side of the transverse cylindrical outer surface of the fiber core 43 between the fiber core 43 and the cladding 42, the temperature fiber bragg grating 44 is sleeved on the outer side of the fiber core 43, the protective layer 41 is arranged on the outer side position of the transverse cylindrical outer surface of the cladding 42, the protective layer 41 is sleeved with the cladding 42, the left end and the right, the core material specifications of the fiber grating input wire 2 and the fiber grating output wire 7 are consistent.
The working principle and the using process of the invention are as follows: after the fiber grating temperature monitoring device is installed, in the using process, two ends of a temperature fiber grating body 4 consisting of a protective layer 41, a cladding 42, a fiber core 43 and a temperature fiber Bragg grating 44 are connected with a fiber grating input wire 2 and a fiber grating output wire 7 in a lossless mode, after the connection, two ends of the temperature fiber grating body 4, a fiber grating input pipe 3 and a fiber grating output pipe 6 which are positioned at the outer sides of the fiber grating input wire 2 and the fiber grating output wire 7 are fixed through a fiber grating positioning sleeve 5 consisting of a positioning bolt 51, a positioning sleeve 52, a protective soft cushion layer 53 and a fixed bottom plate 54, after the fixation, a fiber grating input inserting end 1 and a fiber grating output inserting end 8 are inserted into specific equipment, corresponding monitoring operation can be carried out, and during the monitoring operation, the monitoring operation is carried out through a specific formula (lambda)B＝2neffA) is calculated, (where lambda)BIs the reflected wavelength, neffIs the effective refractive index of the fiber grating, and Λ is the grating period), the period and the effective refractive index of the fiber grating can be changed by stretching and compressing the fiber grating, or the temperature can be changed, so as to achieve the purpose of changing the reflection wavelength of the fiber grating, the central wavelength of the fiber grating has a linear relation with the strain and the temperature, and the fiber grating can be made into strain,Various sensors for temperature, pressure, acceleration, etc. are used for monitoring.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a FBG temperature monitoring devices of rapid cooling heat exchanger prestressing force extension, includes temperature fiber grating body (4) and fiber grating input tube (3), its characterized in that: the fiber bragg grating temperature sensor is characterized in that a fiber bragg grating input pipe (3) is arranged at the position, located in the middle of the end face, of the left end face of the temperature fiber bragg grating body (4), the fiber bragg grating input pipe (3) is connected to the left end face of the temperature fiber bragg grating body (4) through integral forming, a fiber bragg grating input wire (2) is arranged inside the fiber bragg grating input pipe (3), the right end of the fiber bragg grating input wire (2) is connected to the center of the left end face of the temperature fiber bragg grating body (4), the right end of the fiber bragg grating input wire (2) penetrates into the temperature fiber bragg grating body (4) from the center of the left end face of the temperature fiber bragg grating body (4), a fiber bragg grating input plug-in end (1) is arranged at the left end of the fiber bragg grating input wire (2), and the left end of the fiber bragg grating input plug-in end (1) penetrates through and is connected with the left end of the fiber, the fiber bragg grating temperature sensor is characterized in that a fiber bragg grating output pipe (6) is arranged at the position, located in the middle of the end face, of the right end face of the temperature fiber bragg grating body (4), the fiber bragg grating output pipe (6) is connected to the right end face of the temperature fiber bragg grating body (4) in an integrated forming mode, a fiber bragg grating output wire (7) is arranged inside the fiber bragg grating output pipe (6), the left end of the fiber bragg grating output wire (7) is connected to the center of the right end face of the temperature fiber bragg grating body (4), the left end of the fiber bragg grating output wire (7) penetrates into the temperature fiber bragg grating body (4) from the center of the right end face of the temperature fiber bragg grating body (4), a fiber bragg grating output plug-in end (8) is arranged at the right end of the fiber bragg grating output wire (7), and the right end of the fiber bragg grating output wire (7) penetrates through the center, the fiber grating positioning device is characterized in that fiber grating positioning sleeves (5) are arranged on the transverse cylindrical outer surfaces of the fiber grating input tube (3) and the fiber grating output tube (6), and the fiber grating positioning sleeves (5) are sleeved on the outer sides of the fiber grating input tube (3) and the fiber grating output tube (6).
2. A quenching heat exchanger prestressed elongation FBG temperature monitoring device as claimed in claim 1, characterized in that: the temperature fiber bragg grating body (4) comprises a protective layer (41), a cladding (42), a fiber core (43) and a temperature fiber bragg grating (44), the right end of the fiber bragg grating input wire (2) is connected with the left end of the fiber core (43), the right end of the fiber core (43) is connected with the left end of the fiber bragg grating output wire (7), the cladding (42) is arranged at the position, located at the outer side, of the transverse cylindrical outer surface of the fiber core (43), the cladding (42) is sleeved with the fiber core (43), the temperature fiber bragg grating (44) is arranged between the fiber core (43) and the cladding (42) and located at the position, located at the outer side, of the transverse cylindrical outer surface of the fiber core (43), the protective layer (41) is arranged at the position, of the transverse cylindrical outer surface of the fiber bragg grating (42), the protective layer (41) is sleeved with the cladding (42).
3. A quenching heat exchanger prestressed elongation FBG temperature monitoring device as claimed in claim 2, characterized in that: the left end and the right end of the fiber core (43) are required to be connected to the cores inside the fiber grating input wire (2) and the fiber grating output wire (7) in a seamless mode, and the material specifications of the cores inside the fiber grating input wire (2) and the fiber grating output wire (7) are consistent.
4. A quenching heat exchanger prestressed elongation FBG temperature monitoring device as claimed in claim 1, characterized in that: the fiber bragg grating locating sleeve (5) comprises a locating bolt (51), a locating sleeve (52), a protective cushion layer (53) and a fixed bottom plate (54), the transverse cylindrical outer surfaces of the fiber bragg grating input tube (3) and the fiber bragg grating output tube (6) are provided with positioning sleeves (52), the inner wall of the positioning sleeve (52) is connected with a protective cushion layer (53) through adhesive, the protective soft cushion layer (53) is arranged in a way of being attached to the cylindrical outer surfaces of the fiber bragg grating input tube (3) and the fiber bragg grating output tube (6), the bottom side of the positioning sleeve (52) is fixedly connected with a fixed bottom plate (54) through welding, positioning bolts (51) are inserted through the top end of the fixed bottom plate (54) at the front side and the rear side of the positioning sleeve (52), the positioning bolt (51) can bolt and fix the fixed bottom plate (54) under the action of force.
5. A quenching heat exchanger prestressed elongation FBG temperature monitoring device as claimed in claim 1, characterized in that: the lengths of the fiber grating input wire (2) and the fiber grating output wire (7) are not fixed values, and the lengths of the fiber grating input wire (2) and the fiber grating output wire (7) can be prolonged or reduced according to actual use requirements.
6. A quenching heat exchanger prestressed elongation FBG temperature monitoring device as claimed in claim 1, characterized in that: the fiber grating output device is characterized in that the inner walls of the fiber grating input tube (3) and the fiber grating output tube (6) are attached to the outer walls of the fiber grating input wire (2) and the fiber grating output wire (7), and the shape of the fiber grating input tube (3) and the fiber grating output tube (6) cannot be changed under the action of force within a limit range.
7. A quenching heat exchanger prestressed elongation FBG temperature monitoring device as claimed in claim 1, characterized in that: the fiber grating positioning sleeve (5) is provided with two groups, the size and the specification of the fiber grating positioning sleeve (5) are consistent, the inner wall of the fiber grating positioning sleeve (5) must be tightly attached to the outer walls of the fiber grating input tube (3) and the fiber grating output tube (6), and the fiber grating input tube (3) and the fiber grating output tube (6) cannot move left and right relative to the fiber grating positioning sleeve (5).
8. A quenching heat exchanger prestressed elongation FBG temperature monitoring device as claimed in claim 1, characterized in that: the specification and material of the fiber bragg grating input plugging end (1) and the fiber bragg grating output plugging end (8) are consistent, and the fiber bragg grating input plugging end (1) and the fiber bragg grating output plugging end (8) need to be plugged into a temperature instrument to measure the temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910868731.0A CN110646115A (en) | 2019-09-16 | 2019-09-16 | FBG temperature monitoring device for prestress extension of quenching heat exchanger |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910868731.0A CN110646115A (en) | 2019-09-16 | 2019-09-16 | FBG temperature monitoring device for prestress extension of quenching heat exchanger |
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| CN207439571U (en) * | 2017-11-06 | 2018-06-01 | 武汉长进激光技术有限公司 | A kind of temperature sensor for including long-period gratings |
| CN108151909A (en) * | 2017-12-26 | 2018-06-12 | 北京信息科技大学 | A kind of superelevation temperature sensor based on FBG |
| CN207689039U (en) * | 2018-01-09 | 2018-08-03 | 天津盛世华彩科技有限公司 | For distribution optical fiber sensor during mass concrete casting and constructing |
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- 2019-09-16 CN CN201910868731.0A patent/CN110646115A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1715848A (en) * | 2005-07-22 | 2006-01-04 | 北京嘉润森盛光纤传感科技有限公司 | Optical iber grating temperature sensor |
| RU2522679C2 (en) * | 2009-09-30 | 2014-07-20 | Фастен Груп Компани,Лтд. | System of "smart" cable for bridge using built-in sensors with fibre diffraction gratings |
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| CN106248231A (en) * | 2016-09-21 | 2016-12-21 | 成都创慧科达科技有限公司 | A kind of high-temperature resistant optical fiber grating sensor |
| CN207439571U (en) * | 2017-11-06 | 2018-06-01 | 武汉长进激光技术有限公司 | A kind of temperature sensor for including long-period gratings |
| CN108151909A (en) * | 2017-12-26 | 2018-06-12 | 北京信息科技大学 | A kind of superelevation temperature sensor based on FBG |
| CN207689039U (en) * | 2018-01-09 | 2018-08-03 | 天津盛世华彩科技有限公司 | For distribution optical fiber sensor during mass concrete casting and constructing |
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Application publication date: 20200103 |