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High-temperature-resistant and high-pressure-resistant optical fiber strain sensor

A technology of optical fiber strain and high temperature resistance, applied in instruments, optical devices, measuring devices, etc., can solve the problem that the strain sensor cannot work stably for a long time, and achieve strong anti-electromagnetic interference ability, small size, and high measurement accuracy Effect

Active Publication Date: 2021-12-17
NUCLEAR POWER INSTITUTE OF CHINA
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Problems solved by technology

[0003] In order to solve the technical problem that the existing strain sensor cannot work stably for a long time, such as the monitoring of key nuclear power equipment, the present invention provides a high temperature and high pressure optical fiber strain sensor

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Embodiment

[0045] This embodiment provides a high temperature and high pressure resistant optical fiber strain sensor. The optical fiber sensing technology is a high-precision measurement technology; the optical fiber itself has the advantages of fast transmission speed, strong anti-electromagnetic interference ability, corrosion resistance, high temperature resistance and high safety. Therefore, it has been widely used in aerospace, energy, construction and other industrial and military fields. The fiber optic Fab sensor is a typical representative of the fiber optic sensor. With the development of various high-precision processing and assembly technologies, various types of fiber optic Fab sensors have emerged. The fiber-optic F-P sensor can be used to construct the F-P cavity in different forms. The shape of the sensor is flexible and can be used in many different measurement environments. At the same time, the fiber-optic F-P sensor has a simple structure, is not easily affected by th...

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Abstract

The invention discloses a high-temperature-resistant and high-pressure-resistant optical fiber strain sensor which comprises a sensitization substrate, a first high-temperature-resistant metal optical fiber, a second high-temperature-resistant metal optical fiber, a high-temperature-resistant capillary tube, a first pressing sheet and a second pressing sheet. The sensitization substrate is thinned, so that the strain sensitivity of the sensitization substrate is improved; the sensitization substrate is used for supporting the first high-temperature-resistant metal optical fiber, the second high-temperature-resistant metal optical fiber and the high-temperature-resistant capillary tube; the first high-temperature-resistant metal optical fiber and the second high-temperature-resistant metal optical fiber respectively penetrate into the high-temperature-resistant capillary tube from openings in the two ends of the high-temperature-resistant capillary tube to form an optical Fabry-Perot cavity; the first pressing sheet is fixed on the first high-temperature-resistant metal optical fiber, and the second pressing sheet is fixed on the second high-temperature-resistant metal optical fiber. The sensor is small in size, can work for a long time under the conditions of high temperature and high pressure, and has the advantages of strong anti-electromagnetic interference capability, high measurement precision and the like.

Description

technical field [0001] The invention belongs to the technical field of high temperature strain sensors, in particular to a high temperature and high pressure resistant optical fiber strain sensor. Background technique [0002] Strain is an important physical quantity that can reflect the mechanical properties of structures and materials. Its internal strength characteristics can be deduced from the stress distribution of structures and materials, and finally the actual loads borne by various components can be obtained. Therefore, strain measurement is very suitable for the characteristics of materials, the strength of structures, the stress of machinery, and industrial non-destructive testing. The most used traditional strain measurement techniques, methods and theoretical models are very mature and can achieve accurate strain measurement in many environments. Since both metal strain gauges and semiconductor strain gauges are electrical measurement methods, the circuit stru...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16
CPCG01B11/16
Inventor 徐昱根杨恒张晓玲孙磊李朋洲
Owner NUCLEAR POWER INSTITUTE OF CHINA
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