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

Abstract

The invention discloses an extrinsic optical fiber method-Purther interference sensor based on a hollow-core photonic crystal fiber. The sensor consists of two ordinary communication single-mode fibers (2-2) and a hollow-core photonic crystal fiber (2-2). 3) Forming, both ends of the hollow-core photonic crystal fiber (2-3) are respectively fused and connected to one end of two ordinary communication single-mode fibers (2-2), and in addition, in one of the ordinary communication single-mode fibers (2- 2) The end face of the welded end is coated with a Ti2O3 film with a diameter of about 20μm-30μm. The invention also discloses a manufacturing method of the sensor. The beneficial technical effects of the present invention are: (1) the temperature coefficient of the EFPI sensor provided by the present invention is relatively small, and can work normally at a temperature as high as 600° C.; At centimeters (the cavity length of the traditional Fa-Per sensor is in the order of hundreds of micrometers to millimeters), the fringe contrast is still relatively high, which lays the foundation for the application in large-capacity, quasi-distributed sensing systems.

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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