CN111089680A - Portable fiber bragg grating pressure detection system and method - Google Patents
Portable fiber bragg grating pressure detection system and method Download PDFInfo
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- CN111089680A CN111089680A CN201911248428.7A CN201911248428A CN111089680A CN 111089680 A CN111089680 A CN 111089680A CN 201911248428 A CN201911248428 A CN 201911248428A CN 111089680 A CN111089680 A CN 111089680A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
- G01L11/02—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by optical means
- G01L11/025—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by optical means using a pressure-sensitive optical fibre
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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
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/0092—Pressure sensor associated with other sensors, e.g. for measuring acceleration or temperature
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- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses a portable fiber grating pressure detection system and a method, wherein the system comprises: the fiber grating strain sensor comprises a fiber grating demodulator, a fiber grating strain sensor and a fiber grating temperature sensor; the fiber bragg grating strain sensor is used for measuring the internal pressure of a product to be measured and outputting a pressure measurement signal; the fiber bragg grating temperature sensor is used for measuring the surface temperature of a product to be measured and outputting a temperature measurement signal; and the fiber grating demodulator is used for demodulating the pressure measurement signal and the temperature measurement signal output by the fiber grating strain sensor and the fiber grating temperature sensor to obtain the internal pressure and the surface temperature of the product to be detected. The invention can conveniently and quickly measure the pressure in the product.
Description
Technical Field
The invention belongs to the technical field of optical fiber sensing, and particularly relates to a portable fiber bragg grating pressure detection system and a method.
Background
In the aspect of pressure measurement, a traditional barometer is connected to a port of a gas cylinder and needs to be in direct contact with gas, and leakage points are increased on the structure; the traditional strain gauge needs to be welded (the surface property of the gas cylinder, particularly the welding point, and the compressive strength can be reduced) and is an active device, and the product requirement cannot be met.
Disclosure of Invention
The technical problem of the invention is solved: the defects of the prior art are overcome, and the portable fiber bragg grating pressure detection system and the method can be used for conveniently and rapidly measuring the pressure in a product.
In order to solve the technical problem, the invention discloses a portable fiber grating pressure detection system, which comprises: the fiber grating strain sensor comprises a fiber grating demodulator, a fiber grating strain sensor and a fiber grating temperature sensor;
the fiber bragg grating strain sensor is used for measuring the internal pressure of a product to be measured and outputting a pressure measurement signal;
the fiber bragg grating temperature sensor is used for measuring the surface temperature of a product to be measured and outputting a temperature measurement signal;
and the fiber grating demodulator is used for demodulating the pressure measurement signal and the temperature measurement signal output by the fiber grating strain sensor and the fiber grating temperature sensor to obtain the internal pressure and the surface temperature of the product to be detected.
In the above-mentioned portable fiber grating pressure detection system,
the number of the fiber bragg grating strain sensors is three, and the fiber bragg grating strain sensors are adhered to the surface of a product to be detected by epoxy glue;
the number of the fiber bragg grating temperature sensors is one, and the fiber bragg grating temperature sensors are adhered to the surface of a product to be detected by epoxy glue.
In the portable fiber grating pressure detection system, the fiber grating demodulator is used for acquiring a pressure measurement signal output by the fiber grating strain sensor by adopting a two-out-of-three mode for the three fiber grating strain sensors, and demodulating to obtain the internal pressure of a product to be detected; and correcting the fiber bragg grating temperature sensor according to the internal pressure of the product to be detected obtained through demodulation.
In the above-mentioned portable fiber grating pressure detecting system, the fiber grating demodulator includes: the device comprises a tunable light source, a DSP control module, an A/D acquisition module, a D/A current driving module, an optical fiber coupler, an optical fiber circulator and a photoelectric detector;
the DSP control module, the D/A current driving module, the tunable light source, the optical fiber coupler, the optical fiber circulator, the photoelectric detector and the A/D acquisition module are sequentially connected in an end-to-end manner to form an annular loop;
a fiber optic circulator, comprising: an optical fiber circulator I and an optical fiber circulator II;
a photodetector, comprising: photoelectric detector I and photoelectric detector II.
In the above-mentioned portable fiber grating pressure detection system,
the DSP control module is used for controlling the D/A current driving module to output high-precision current with controllable size;
the tunable light source is used for outputting light beams with specific wavelength and specific intensity under the action of high-precision current;
the optical fiber coupler is used for splitting the light beam with specific wavelength and specific intensity output by the tunable light source to obtain a sub-light beam I and a sub-light beam II;
the optical fiber circulator I is used for receiving the sub-beam I and outputting the sub-beam I reflected by the grating to the photoelectric detector I;
the optical fiber circulator II is used for receiving the sub-beam II and outputting the sub-beam II reflected by the grating to the photoelectric detector II;
the photoelectric detector I is used for converting the received sub-beams I into voltage signals I;
the photoelectric detector II is used for converting the received sub-beam II into a voltage signal II;
the A/D acquisition module is used for acquiring signals of the photoelectric detector I and the photoelectric detector II to obtain a voltage signal I and a voltage signal II and outputting the acquired voltage signal I and the acquired voltage signal II to the DSP control module;
the DSP control module is also used for resolving to obtain the central wavelength of the grating according to the voltage signal I and the voltage signal II; and calculating to obtain the actual value of the internal pressure of the product to be measured according to the calculated central wavelength and calibration parameters of the grating.
In the portable fiber bragg grating pressure detection system, the current precision of the high-precision current can reach 4.88 mua. Circuit board of tunable light source and phase current input pin I of tunable light sourcePHThe current precision of the output of the connected current source is higher than 5 mua, and the output of the current source is connected with a right current input pin I of the tunable light sourceRRAnd a left direction current input pin ILRThe accuracy of the current output by the connected current source is higher than 30 mu a.
In the above-mentioned portable fiber grating pressure detection system,
the wavelength ranges of the specific wavelengths are: 1528.8-1563.9 nm;
the intensity range for a particular intensity is: 10dBm to 13 dBm.
In the above-mentioned portable fiber grating pressure detecting system, the fiber grating demodulator further includes: a communication module;
and the communication module is used for sending the actual value of the internal pressure of the product to be detected output by the DSP control module to the upper computer.
In the above-mentioned portable fiber grating pressure detecting system, the fiber grating demodulator further includes: a temperature control module;
and the temperature control module is used for controlling the temperature of the tunable light source and preventing the light beam output by the tunable light source from drifting.
Correspondingly, the invention also discloses a portable fiber grating pressure detection method, which comprises the following steps:
measuring the internal pressure of a product to be measured through a fiber bragg grating strain sensor, and outputting a pressure measurement signal;
measuring the surface temperature of a product to be measured by a fiber bragg grating temperature sensor, and outputting a temperature measurement signal;
and demodulating the pressure measurement signal and the temperature measurement signal output by the fiber grating strain sensor and the fiber grating temperature sensor through a fiber grating demodulator to obtain the internal pressure and the surface temperature of the product to be detected.
The invention has the following advantages:
the invention discloses a portable fiber grating pressure detection system and a method, wherein a fiber grating is a passive device and is a non-contact sensor, other precise electronic equipment cannot be interfered, welding is not needed, the structural properties of a product cannot be changed, the fiber grating is light in weight and small in size, the layout is flexible, a demodulator can be directly connected with an upper computer for communication, and the pressure in the product can be conveniently and quickly measured.
Drawings
FIG. 1 is a block diagram of a portable fiber grating pressure detection system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a fiber grating demodulator in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example 1
As shown in fig. 1, in this embodiment, the portable fiber grating pressure detecting system includes: the fiber grating strain gauge comprises a fiber grating demodulator 2, a fiber grating strain sensor 3 and a fiber grating temperature sensor 4. The fiber bragg grating strain sensor 3 is used for measuring the internal pressure of a product to be measured and outputting a pressure measurement signal; the fiber bragg grating temperature sensor 4 is used for measuring the surface temperature of a product to be measured and outputting a temperature measuring signal; and the fiber grating demodulator 2 is used for demodulating the pressure measurement signal and the temperature measurement signal output by the fiber grating strain sensor 3 and the fiber grating temperature sensor 4 to obtain the internal pressure and the surface temperature of the product to be detected.
Preferably, the number of the fiber bragg grating strain sensors 3 is three, and the fiber bragg grating strain sensors are adhered to the surface of a product to be detected by epoxy glue; the number of the fiber bragg grating temperature sensors 4 is one, and the fiber bragg grating temperature sensors are adhered to the surface of a product to be detected by epoxy glue. The fiber grating demodulator 2 is specifically used for acquiring pressure measurement signals output by the fiber grating strain sensors by adopting a three-out-of-two mode for the three fiber grating strain sensors, and demodulating the pressure measurement signals to obtain the internal pressure of a product to be measured; and correcting the fiber bragg grating temperature sensor according to the internal pressure of the product to be detected obtained through demodulation.
In a preferred embodiment of the present invention, as shown in fig. 2, the fiber grating demodulator 2 may specifically include: the device comprises a tunable light source 5, a DSP control module 6, an A/D acquisition module 7, a D/A current driving module 8, an optical fiber coupler 11, an optical fiber circulator 12 and a photoelectric detector 13. The DSP control module 6, the D/A current driving module 8, the tunable light source 5, the optical fiber coupler 11, the optical fiber circulator 12, the photoelectric detector 13 and the A/D acquisition module 7 are sequentially connected in an end-to-end manner to form an annular loop. Further, the optical fiber circulator 12 may specifically include: an optical fiber circulator I121 and an optical fiber circulator II 122; the photodetector 13 may specifically include: a photodetector I131 and a photodetector II 132.
Wherein: the DSP control module 6 is used for controlling the D/A current driving module 8 to output high-precision current with controllable size; the tunable light source 5 is used for outputting light beams with specific wavelength and specific intensity under the action of high-precision current; the optical fiber coupler 11 is used for splitting the light beam with the specific wavelength and the specific intensity output by the tunable light source 5 to obtain a sub-light beam I and a sub-light beam II; the optical fiber circulator I121 is used for receiving the sub-beam I and outputting the sub-beam I reflected by the grating to the photoelectric detector I131; the optical fiber circulator II 122 is used for receiving the sub-beam II and outputting the sub-beam II reflected by the grating to the photoelectric detector II 132; the photoelectric detector I131 is used for converting the received sub-beams I into voltage signals I; the photoelectric detector II 132 is used for converting the received sub-beam II into a voltage signal II; the A/D acquisition module 7 is used for acquiring signals of the photoelectric detector I131 and the photoelectric detector II 132 to obtain a voltage signal I and a voltage signal II and outputting the acquired voltage signal I and the acquired voltage signal II to the DSP control module 6; the DSP control module 6 is also used for resolving to obtain the central wavelength of the grating according to the voltage signal I and the voltage signal II; and calculating to obtain the actual value of the internal pressure of the product to be measured according to the calculated central wavelength and calibration parameters of the grating.
Preferably, the current precision of the high-precision current can reach 4.88 mua. Circuit board of tunable light source 5 and phase current input pin I of tunable light source 5PHThe current precision of the output of the connected current source is higher than 5 mu a, and the output of the current source is connected with a right current input pin I of the tunable light source 5RRAnd a left direction current input pin ILRThe accuracy of the current output by the connected current source is higher than 30 mu a.
Preferably, the wavelength ranges of the specific wavelengths are: 1528.8-1563.9 nm; the intensity range for a particular intensity is: 10dBm to 13 dBm.
Preferably, the fiber grating demodulator 2 may further include: a temperature control module 10. The temperature control module 10 is configured to control a temperature of the tunable light source 5, and prevent a light beam output by the tunable light source 5 from drifting.
In a preferred embodiment of the present invention, the fiber grating demodulator 2 may further include: and a communication module 9. The communication module 9 is used for sending the actual value of the internal pressure of the product to be detected output by the DSP control module 6 to the upper computer 14.
Therefore, the portable fiber bragg grating pressure detection system at least has the following advantages: the fiber grating sensor is a non-contact sensor, so that a leakage point cannot be formed, and the reliability is reduced; the fiber grating sensor can be glued without welding, welding spots do not exist, and products cannot be damaged; the fiber grating has light weight, small volume and flexible layout, and can be used in a complex structure; the system can use a plurality of sensors on the same product, thereby improving the reliability; the system has high analysis speed and can realize high-frequency detection.
Example 2
On the basis of the above embodiment, the present invention also discloses a portable fiber grating pressure detection method, which comprises: measuring the internal pressure of a product to be measured through a fiber bragg grating strain sensor, and outputting a pressure measurement signal; measuring the surface temperature of a product to be measured by a fiber bragg grating temperature sensor, and outputting a temperature measurement signal; and demodulating the pressure measurement signal and the temperature measurement signal output by the fiber grating strain sensor and the fiber grating temperature sensor through a fiber grating demodulator to obtain the internal pressure and the surface temperature of the product to be detected.
Preferably, during specific operation, three fiber grating strain sensors and one fiber grating temperature sensor can be adhered to a proper position on the surface of a product by using epoxy glue and cured for not less than 24 hours; then, inflating and deflating the product, selecting more than 10 pressure points at equal intervals, and recording the temperature, the pressure and the central wavelength of the grating when the preset pressure is reached; repeating the step for multiple times to obtain fitting models and parameters of temperature, pressure and central wavelength; and finally, a fiber grating demodulator is used for selecting three strain gratings from two, and the pressure value is obtained by eliminating the influence caused by the temperature through the temperature grating.
For the method embodiment, since it corresponds to the system embodiment, the description is relatively simple, and for the relevant points, reference may be made to the description of the system embodiment section.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.
Those skilled in the art will appreciate that the invention may be practiced without these specific details.
Claims (10)
1. A portable fiber grating pressure detection system, comprising: the fiber grating strain gauge comprises a fiber grating demodulator (2), a fiber grating strain sensor (3) and a fiber grating temperature sensor (4);
the fiber bragg grating strain sensor (3) is used for measuring the internal pressure of a product to be measured and outputting a pressure measurement signal;
the fiber bragg grating temperature sensor (4) is used for measuring the surface temperature of a product to be measured and outputting a temperature measuring signal;
and the fiber grating demodulator (2) is used for demodulating the pressure measurement signal and the temperature measurement signal output by the fiber grating strain sensor (3) and the fiber grating temperature sensor (4) to obtain the internal pressure and the surface temperature of the product to be detected.
2. The portable fiber grating pressure detection system of claim 1,
the number of the fiber bragg grating strain sensors (3) is three, and the fiber bragg grating strain sensors are adhered to the surface of a product to be detected by epoxy glue;
the number of the fiber bragg grating temperature sensors (4) is one, and the fiber bragg grating temperature sensors are adhered to the surface of a product to be detected by epoxy glue.
3. The portable fiber grating pressure detection system according to claim 2, wherein the fiber grating demodulator (2) is configured to obtain a pressure measurement signal output by the fiber grating strain sensor by selecting two out of three for three fiber grating strain sensors, and demodulate the pressure measurement signal to obtain an internal pressure of a product to be detected; and correcting the fiber bragg grating temperature sensor according to the internal pressure of the product to be detected obtained through demodulation.
4. The portable fiber grating pressure detection system of claim 1, wherein the fiber grating demodulator (2) comprises: the system comprises a tunable light source (5), a DSP control module (6), an A/D acquisition module (7), a D/A current driving module (8), an optical fiber coupler (11), an optical fiber circulator (12) and a photoelectric detector (13);
the Digital Signal Processor (DSP) control module (6), the D/A current driving module (8), the tunable light source (5), the optical fiber coupler (11), the optical fiber circulator (12), the photoelectric detector (13) and the A/D acquisition module (7) are sequentially connected in an end-to-end manner to form an annular loop;
a fiber optic circulator (12) comprising: an optical fiber circulator I (121) and an optical fiber circulator II (122);
photodetector (13) comprising: a photodetector I (131) and a photodetector II (132).
5. The portable fiber grating pressure detection system of claim 4,
the DSP control module (6) is used for controlling the D/A current driving module (8) to output high-precision current with controllable magnitude;
the tunable light source (5) is used for outputting a light beam with a specific wavelength and specific intensity under the action of high-precision current;
the optical fiber coupler (11) is used for splitting the light beam with specific wavelength and specific intensity output by the tunable light source (5) to obtain a sub-light beam I and a sub-light beam II;
the optical fiber circulator I (121) is used for receiving the sub-beam I and outputting the sub-beam I reflected by the grating to the photoelectric detector I (131);
the optical fiber circulator II (122) is used for receiving the sub-beam II and outputting the sub-beam II reflected by the grating to the photoelectric detector II (132);
the photoelectric detector I (131) is used for converting the received sub-beams I into voltage signals I;
the photoelectric detector II (132) is used for converting the received sub-beam II into a voltage signal II;
the A/D acquisition module (7) is used for acquiring signals of the photoelectric detector I (131) and the photoelectric detector II (132) to obtain a voltage signal I and a voltage signal II and outputting the acquired voltage signal I and the acquired voltage signal II to the DSP control module (6);
the DSP control module (6) is also used for resolving to obtain the central wavelength of the grating according to the voltage signal I and the voltage signal II; and calculating to obtain the actual value of the internal pressure of the product to be measured according to the calculated central wavelength and calibration parameters of the grating.
6. Portable optical fiber according to claim 5The grating pressure detection system is characterized in that the current precision of the high-precision current can reach 4.88 mua. Circuit board of tunable light source (5) and phase current input pin I of tunable light source (5)PHThe current precision of the output of the connected current source is higher than 5 mu a, and the output of the current source is connected with a right current input pin I of the tunable light source (5)RRAnd a left direction current input pin ILRThe accuracy of the current output by the connected current source is higher than 30 mu a.
7. The portable fiber grating pressure detection system of claim 5,
the wavelength ranges of the specific wavelengths are: 1528.8-1563.9 nm;
the intensity range for a particular intensity is: 10dBm to 13 dBm.
8. The portable fiber grating pressure detection system of claim 5, wherein the fiber grating demodulator (2) further comprises: a communication module (9);
and the communication module (9) is used for sending the actual value of the internal pressure of the product to be detected output by the DSP control module (6) to the upper computer (14).
9. The portable fiber grating pressure detection system of claim 5, wherein the fiber grating demodulator (2) further comprises: a temperature control module (10);
and the temperature control module (10) is used for controlling the temperature of the tunable light source (5) and preventing the light beam output by the tunable light source (5) from drifting.
10. A portable fiber grating pressure detection method is characterized by comprising the following steps:
measuring the internal pressure of a product to be measured through a fiber bragg grating strain sensor, and outputting a pressure measurement signal;
measuring the surface temperature of a product to be measured by a fiber bragg grating temperature sensor, and outputting a temperature measurement signal;
and demodulating the pressure measurement signal and the temperature measurement signal output by the fiber grating strain sensor and the fiber grating temperature sensor through a fiber grating demodulator to obtain the internal pressure and the surface temperature of the product to be detected.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111649869A (en) * | 2020-06-23 | 2020-09-11 | 西安航天计量测试研究所 | Non-contact pressure measuring method and system based on strain and temperature sensors |
| CN111678636A (en) * | 2020-06-09 | 2020-09-18 | 西安航天动力研究所 | Non-contact pressure intensity measuring device and method |
| CN113639892A (en) * | 2021-08-13 | 2021-11-12 | 山东省科学院激光研究所 | Fiber grating temperature sensor and quasi-distributed temperature measurement system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04276535A (en) * | 1991-03-02 | 1992-10-01 | Fujikura Ltd | Otdr apparatus |
| CN2775629Y (en) * | 2005-03-18 | 2006-04-26 | 南阳二机石油装备(集团)有限公司 | Optic fiber grating sensing stress detector |
| CN101476900A (en) * | 2009-01-19 | 2009-07-08 | 冷劲松 | Time division multiplexing optical fiber sensing method and apparatus |
| CN101603866A (en) * | 2009-07-16 | 2009-12-16 | 上海华魏光纤传感技术有限公司 | Distributed optical fiber stress temperature sensing device and method for sensing thereof |
| CN103245369A (en) * | 2013-03-22 | 2013-08-14 | 黎敏 | Novel fiber bragg grating demodulation method and system thereof based on multi-longitudinal mode F-P laser device |
| CN103644991A (en) * | 2013-12-27 | 2014-03-19 | 哈尔滨理工大学 | Dual-FBG (fiber bragg grating) stress sensor based on DFB (Distributed Feed Back) laser demodulation and stress measuring method |
| CN209027704U (en) * | 2018-11-07 | 2019-06-25 | 中国舰船研究设计中心 | Steel construction stress monitoring system based on optical fiber sensing technology |
-
2019
- 2019-12-09 CN CN201911248428.7A patent/CN111089680A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04276535A (en) * | 1991-03-02 | 1992-10-01 | Fujikura Ltd | Otdr apparatus |
| CN2775629Y (en) * | 2005-03-18 | 2006-04-26 | 南阳二机石油装备(集团)有限公司 | Optic fiber grating sensing stress detector |
| CN101476900A (en) * | 2009-01-19 | 2009-07-08 | 冷劲松 | Time division multiplexing optical fiber sensing method and apparatus |
| CN101603866A (en) * | 2009-07-16 | 2009-12-16 | 上海华魏光纤传感技术有限公司 | Distributed optical fiber stress temperature sensing device and method for sensing thereof |
| CN103245369A (en) * | 2013-03-22 | 2013-08-14 | 黎敏 | Novel fiber bragg grating demodulation method and system thereof based on multi-longitudinal mode F-P laser device |
| CN103644991A (en) * | 2013-12-27 | 2014-03-19 | 哈尔滨理工大学 | Dual-FBG (fiber bragg grating) stress sensor based on DFB (Distributed Feed Back) laser demodulation and stress measuring method |
| CN209027704U (en) * | 2018-11-07 | 2019-06-25 | 中国舰船研究设计中心 | Steel construction stress monitoring system based on optical fiber sensing technology |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111678636A (en) * | 2020-06-09 | 2020-09-18 | 西安航天动力研究所 | Non-contact pressure intensity measuring device and method |
| CN111649869A (en) * | 2020-06-23 | 2020-09-11 | 西安航天计量测试研究所 | Non-contact pressure measuring method and system based on strain and temperature sensors |
| CN111649869B (en) * | 2020-06-23 | 2021-10-15 | 西安航天计量测试研究所 | Non-contact pressure measuring method and system based on strain and temperature sensors |
| CN113639892A (en) * | 2021-08-13 | 2021-11-12 | 山东省科学院激光研究所 | Fiber grating temperature sensor and quasi-distributed temperature measurement system |
| CN113639892B (en) * | 2021-08-13 | 2024-02-02 | 山东省科学院激光研究所 | Fiber bragg grating temperature sensor and quasi-distributed temperature measurement system |
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