Hollow photon crystal optical fiber based Fabry-perot interferometer sensor and its production method

Abstract

The invention discloses a hallow photonic crystal fiber based non-intrinsic fiber FP interference sensor composed two ordinary communication single-mode optical fibers 2-2 and a hallow photonic crystal fiber 2-3, the two ends of which are welded with one end of two ordinary communication single-mode optical fibers 2-2, otherwise, one end of one ordinary communication single-mode optical fiber 2-2 is coated with Ti203 film with diameter of 20um-30 um. The invention also discloses the production method of the sensor. The available technical effects of the invention are: (1) the temperature coefficient of EFPI sensor of the invention is small, and capable of working under temperature of 600 deg; (2) when the cavity length of the FP sensor is extended to several centimeter (the cavity length of traditional FP sensor is several hundred microns to millimeter in order), the stripe contrast is high, thereby establishing the foundation in the application of high capacity, quasi-distributed sensing system.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to an extrinsic optical fiber method-pertinental (EFPI) interference sensor based on a hollow-core photonic crystal fiber and a manufacturing method thereof. Background technique [0002] Due to the advantages of simple structure, high resolution, high precision, small size, wide measurement range, and no fear of electromagnetic interference, fiber optic sensors have attracted extensive attention from scholars at home and abroad in recent years, and have been widely used in composite materials, military and civilian large-scale Structural condition monitoring of building structures, aerospace vehicles, aircraft, etc. to enable so-called smart structures. EFPI interference sensor is an important type of fiber optic sensor, it has all the advantages of fiber optic sensors, but in the actual application process, there are some problems that affect its further ...

AI Technical Summary

Problems solved by technology

EFPI interference sensor is an important type of fiber optic sensor, it has all the advantages of fiber optic sensors, but in the actual application process, there are some problems that affect its further wide application: (1). The measurement of traditional EFPI will be affected by temperature changes This will lead to the cross influence between the measured parameters of the sensor, thus affecting the measurement accuracy; (2). The traditional EFPI cavity length cannot be too long, too long cavity length will seriously affect the contrast of interference fringes, which is not conducive to sensing Signal extraction, which will greatly affect the large-scale multiplexing of EFPI

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