Plastic optical fiber refractive index sensor on basis of micropore structure and preparation method and application thereof

Abstract

The invention relates to a plastic optical fiber refractive index sensor on the basis of a micropore structure. The plastic optical fiber refractive index sensor comprises a plastic optical fiber used as a substrate and the micropore structure processed on the lateral surface of the plastic optical fiber; the axial direction of a micropore perpendicularly and transversely penetrates through the axial direction of the plastic optical fiber; a light source for providing an optical signal is arranged at one end of the plastic optical fiber; a power meter is arranged at the other end of the plastic optical fiber so as to detect power loss after the light source is spread by the plastic optical fiber. The plastic optical fiber adopted by the plastic optical fiber refractive index sensor is a low-loss optical waveguide and transmission loss in the optical waveguide is ignored under a certain length, and thus, loss of the optical fiber is only related to loss of a sensing head, namely loss of the micropore structure part. According to the invention, a machining method is utilized to make the micropore sensing structure on the lateral surface of the optical fiber; the plastic optical fiber refractive index sensor has the advantages of simple process, high productivity, low cost and the like; and excellent temperature stability enables the structure to have important application in detection of a refractive index.

Description

technical field [0001] The invention relates to a plastic optical fiber refractive index sensor based on a micropore structure, a preparation method and application thereof, and belongs to the technical field of sensors. Background technique [0002] Optical fiber sensors have the characteristics of high sensitivity, anti-electromagnetic interference, anti-chemical corrosion, small size and fast response. Compared with traditional silica optical fibers, plastic optical fibers have the advantages of large core diameter, high toughness, low price, simple production, easy maintenance, and high reliability. Therefore, the plastic optical fiber (POF) sensor is a kind of sensor widely studied at home and abroad. Among them, the refractive index sensor based on plastic optical fiber has extremely important applications in many fields such as environmental monitoring, clinical testing, and food testing. However, the current research on optical fiber at home and abroad mainly has t...

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Problems solved by technology

[0003] 1) Most of the optical fiber refractive index sensors reported at home and abroad are based on special optical fibers or interferometer structures, which have problems such as high price, sensitivity to refractive index temperature addition, and poor stability;

[0004] 2) There are many studies on plastic optical fiber, but less research on its application in the field of refractive index sensing

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