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A capillary type fiber grating high-temperature sensor and a manufacturing method thereof

A temperature sensor, fiber grating technology, applied in thermometers, thermometers with physical/chemical changes, instruments, etc., can solve the problems of large metallized packaging structure, low temperature resistance of organic adhesives, and large thermal mismatch. , to achieve the effect of improving long-term stability and reliability, reducing structural size, and expanding operating temperature range

Inactive Publication Date: 2017-08-04
BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the shortcomings of the existing optical fiber grating temperature sensor metallization packaging structure size, high manufacturing difficulty, large thermal mismatch, low temperature resistance and poor reliability of organic adhesives, and propose a capillary type Optical fiber grating high-temperature temperature sensor and manufacturing method thereof, the sensor can realize temperature measurement at (-55-1100)°C

Method used

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  • A capillary type fiber grating high-temperature sensor and a manufacturing method thereof
  • A capillary type fiber grating high-temperature sensor and a manufacturing method thereof
  • A capillary type fiber grating high-temperature sensor and a manufacturing method thereof

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Embodiment 1

[0038] like figure 1 As shown, a capillary fiber grating high-temperature temperature sensor includes: a fiber grating 3 as a temperature measurement sensitive element, a non-metallic capillary 4 as a packaging structure, an optical fiber 1 and a cavity 5, wherein the optical fiber grating 3 is engraved on the optical fiber 1 . The connection relationship is: insert the optical fiber 1 engraved with the fiber grating 3 into the non-metallic capillary 4, and there is a certain distance between the end face 6 of the fiber and the end face 7 of the capillary as the cavity 5, and the size of the cavity 5 is designed to ensure the freedom of the fiber grating 3. Stretches to isolate strain for temperature measurement.

[0039] The manufacturing method of the sensor will be described in detail below by taking a quartz optical fiber, a fiber grating sensitive element carved by an excimer laser, and a quartz glass capillary with double-ended openings as examples.

[0040] A kind of ...

Embodiment 2

[0052] like figure 1 As shown, a capillary fiber grating high-temperature temperature sensor includes: a fiber grating 3 as a temperature measurement sensitive element, a non-metallic capillary 4 as a packaging structure, an optical fiber 1 and a cavity 5, wherein the optical fiber grating 3 is engraved on the optical fiber 1 . The connection relationship is: insert the optical fiber 1 engraved with the fiber grating 3 into the non-metallic capillary 4, and there is a certain distance between the end face 6 of the fiber and the end face 7 of the capillary as the cavity 5, and the size of the cavity 5 is designed to ensure the freedom of the fiber grating 3. Stretches to isolate strain for temperature measurement.

[0053] The fabrication method of the sensor will be described in detail below by taking a quartz optical fiber, a fiber grating sensitive element engraved by a femtosecond laser, and a single-end closed sapphire crystal capillary as examples.

[0054] A kind of ma...

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Abstract

The invention relates to a capillary type fiber grating high-temperature sensor and a manufacturing method thereof applicable to precision measurement of high temperatures such as structural member surface temperatures and air-flow temperatures in the fields of spaceflight, weapons, nuclear industry, etc. The invention belongs to the technical field of optical fiber sensing measurement. The sensor comprises fiber gratings as temperature measurement sensing elements and a non-metallic capillary as a package structure. A method of welding is used to achieve the integrated packaging of an optical fiber and the capillary, thereby reducing the size of a sensor structure, reducing influences by thermal mismatch between the packaging structure and the optical fiber, avoiding easy aging and creep caused by adhesive, avoiding softening and decomposition at high temperatures and improving the sensor operating temperature range as well as the long-term stability and reliability of working in high temperature and other harsh environments. The sensor and the manufacturing method thereof can be applied to precision measurement of high temperatures such as structural member surface temperatures and air-flow temperatures in the fields of aerospace, weapons, nuclear industry, etc.

Description

technical field [0001] The invention relates to a capillary-type optical fiber grating high-temperature temperature sensor and a manufacturing method thereof, which can be used for precision measurement of high-temperature temperatures such as the surface temperature of structural parts and airflow temperature in the fields of aerospace, weaponry, and nuclear industry, and belongs to the optical fiber sensing measurement technology field. [0002] technical background [0003] In applications in extremely harsh environments such as aerospace, weapons, and nuclear industries, it is necessary to measure the temperature of structural parts or airflow stably. , conventional sensors such as thermocouples and pyrometers are often difficult to use in such harsh environments due to the limitation on the structural size of the temperature sensor and the influence of electromagnetic interference, etc. [0004] Fiber Bragg Grating is a sensitive component built in optical fiber. By det...

Claims

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Application Information

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IPC IPC(8): G01K11/32G01K11/3206
CPCG01K11/32
Inventor 陈爽隋广慧武洪波江琴张慧君吴天
Owner BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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