Method for regulating and controlling LPFG sensitivity by polymethacrylic acid

Abstract

The invention discloses a method for regulating and controlling LPFG sensitivity by polymethylacrylic acid, which controls the thickness of a polymethylacrylic acid nano film on the surface of LPFG by controlling the concentration, reaction time and reaction temperature of a reaction reagent, thereby accurately regulating and controlling the sensitivity range of LPFG to different refractive indexes and realizing high-sensitivity regulation and control of LPFG to different refractive indexes. Expensive instruments and equipment are not needed, the operation process is simple and convenient, and the method is expected to be widely applied to the field of LPFG biochemical molecule detection.

Description

Technical field

[0001] The present invention relates to the field of long period grating detection, and more particularly to a method involving a polymethyl methacrylic acid to regulate LPFG sensitivity.Background technique

[0002] Long Period Fiber Grating, LPFG is a passive optical sensing device having a sensitive performance of ambient refractive index, has been tried to measure the liquid refractive index, and the long period grating has a high refractive index. Sensitivity. However, the naked long period grating typically has a high sensitivity to the environmental refractive index of 1.4000 to 1.453, and the sensitivity of the ambient medium having a refractive index of 1.4 is very low. Since most of the refractive index of the detected environmental medium is between 1.0-1.4 (such as the aqueous solution refractive index near 1.333), this defect inherentially inherently limits its application in practice.

[0003] In recent years, various membrane modification techniques and various ...

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