Optical fiber polymer microcavity pressure sensor and preparation method thereof

Abstract

The invention discloses an optical fiber polymer microcavity pressure sensor and a preparation method. The end face of one end of an optical fiber in the optical fiber polymer microcavity pressure sensor is provided with a recess, a micro air cavity is arranged between the recess and air, heating laser is injected into the end face of the optical fiber provided with the recess from the other end of the optical fiber, and ultraviolet glue is dripped on the end face of the recess. According to the preparation method of the optical fiber polymer microcavity pressure sensor, geometric parameters of the ultraviolet glue on the end face of the optical fiber are changed by heating laser, the thickness of the ultraviolet glue and the length of the micro air cavity can be flexibly controlled, the pressure sensitive characteristic of the sensor is regulated and controlled, the performance and applicability of the sensor are improved, and the requirements of different application occasions on pressure, sound wave and ultrasonic wave detection can be met.

Description

technical field [0001] The invention relates to the technical field of optical fiber pressure sensors, in particular to an optical fiber polymer microcavity pressure sensor and a preparation method. Background technique [0002] Optical fiber pressure sensing uses light as the carrier and optical fiber as the medium to sense and transmit external pressure signals. It has the advantages of small size, light weight, strong electrical insulation, and anti-electromagnetic interference. At the same time, the sensor can withstand extreme conditions such as high temperature, high pressure, strong shock and vibration, and can be used for pressure detection in flammable, explosive, high temperature and high pressure environments. [0003] Optical fiber Fabry-Perot sensor is a new type of sensor. By making two high-reflection film layers in the optical fiber, an F-P cavity with a certain size is formed. When the light beam passes through the F-P cavity, multiple transmission and refle...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the manufacture of the optical fiber Fabry-Perot sensor structure in the prior art involves transferring a membrane with a thickness of micron or even nanometer to the tiny optical fiber end face. It is also difficult to ensure the repeatability of parameters such as film thickness and film thickness. A fiber optic polymer microcavity pressure sensor and its preparation method are provided.

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