Fiber Bragg grating sensor packaging structure and packaging method suitable for high temperature environment

Abstract

The invention relates to a fiber grating sensor package structure suitable for a high-temperature environment. The fiber grating sensor package structure comprises an upper layer package and a lower layer package; the lower layer package is provided with an optical fiber placement portion; two optical fiber fixing through holes which are spaced apart are formed in the lower layer package; the optical fiber placement portion is divided into a first placement portion, a second placement portion, and a third placement portion through the optical fiber fixing through holes; the first placement portion is located between the two optical fiber fixing through holes; the groove depth of the first placement portion is greater than the groove depths of the second placement portion and the third placement portion; the upper layer package includes two adhesive injection portions; the two adhesive injection portions are respectively corresponding to the two optical fiber fixing through holes; and adhesive injection holes are formed in the tops of the adhesive injection portions. The invention also provides a fiber grating sensor packaging method suitable for a high-temperature environment. Whenthe package structure of the invention is installed, a fiber grating sensor is directly bonded to a device to be tested, and therefore, measurement error caused by the problem of strain transmissioncan be avoided; and a two-point type bonding method is adopted, and therefore, the influence of an adhesive on the performance of the fiber grating sensor can be avoided.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a fiber grating sensor packaging structure and packaging method. Background technique [0002] Fiber grating sensors have been widely used in military, aerospace, environmental monitoring and safety detection of civil building structures. In order to meet the requirements of various harsh environments, it is necessary to design a protective packaging structure for the fiber grating. [0003] At present, there are two commonly used packaging methods. One is to glue the fiber grating into the protective part, and then glue the protective part to the test part. When in use, the strain of the test part is transmitted to the fiber grating through the protective part. sensor, but in this process, the problem of strain transmission will make the measurement results inaccurate. The other is to directly bond the fiber grating to the object under test as a whole, but this method is used i...

AI Technical Summary

Problems solved by technology

[0003] At present, there are two commonly used packaging methods. One is to glue the fiber grating into the protective part, and then glue the protective part to the test part. When in use, the strain of the test part is transmitted to the fiber grating through the protective part. sensor, but in this process, the problem of strain transmission will make the measurement results inaccurate. The other is to directly bond the fiber grating to the object under test as a whole, but this method is used in a high temperature (above 1000°C) environment In this case, it is necessary to coat the sensing area (grating) of the fiber grating sensor with an adhesive. The adhesive may expand during use, which will not only affect the performance of the fiber grating sensor, but also The process is more difficult, usually the bonding effect is not good

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