Temperature and humidity in-situ detection sensor and humidity sensor preparation method

By designing a temperature and humidity in-situ detection sensor for a humidity sensor containing a PVA film and a composite KGM hydrogel film and a temperature sensor with an optical fiber Bragg grating, the problem of low detection accuracy caused by external environmental humidity interference in the prior art is solved, and accurate online detection of stone cultural relics is achieved.

CN119756467AActive Publication Date: 2025-04-04CHONGQING UNIV OF TECH +1
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Patent Information

Application Number
CN202411861028.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-17
Publication Date
2025-04-04
Estimated Expiration
2044-12-17

AI Technical Summary

Technical Problem

When the binary parameters of the body temperature and humidity of stone cultural relics are detected online in situ in the semi-dry environment, existing fiber optic sensors are easily disturbed by external environmental humidity, resulting in low detection accuracy.

Method used

A temperature and humidity in-situ detection sensor is designed, adopting a protective layer structure, with a built-in humidity sensor and a temperature sensor. The humidity sensor consists of a polyvinyl alcohol (PVA) film and a composite konjac glucomannan (KGM) hydrogel film. The temperature sensor achieves temperature compensation through an optical fiber Bragg grating.

Benefits of technology

Accurate online in-situ detection of the humidity and temperature of the stone cultural relics, avoiding interference from changes in external environment humidity, and having the characteristics of heat resistance, good flexibility and effective isolation of air humidity.

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Abstract

The temperature and humidity in-situ detection sensor comprises a protective layer, an extending groove is formed in the middle of the protective layer, a hydrophobic isolating membrane is fixed to the face, provided with the groove, of the protective layer, adhesives are arranged on the portions, on the two sides of the hydrophobic isolating membrane, of the surface of the protective layer respectively, and a humidity sensor and a temperature sensor are arranged in the groove side by side in parallel; the humidity sensor comprises a first fiber Bragg grating, the first fiber Bragg grating comprises a first fiber core, the first fiber core is provided with a first grating area, the periphery of the grating area is coated with a first cladding, and the periphery of the first cladding is sequentially attached with a PVA film and a composite KGM hydrogel film from inside to outside; the temperature sensor comprises a second fiber Bragg grating, the second fiber Bragg grating comprises a second fiber core, the second fiber core is provided with a second grating area, and the periphery of the second grating area is coated with a second cladding. The temperature and humidity in-situ detection sensor can accurately detect the temperature and humidity information of the stone cultural relic body, and the measurement result is not affected by the external environment such as the environment humidity.
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