High-sensitivity pressure-sensing photonic crystal fiber and pressure sensor thereof

Abstract

The invention discloses a high-sensitivity pressure-sensing photonic crystal fiber and a pressure sensor thereof. The photonic crystal fiber comprises a strip-shaped quartz body. An elliptical throughhole which is axially strip-shaped and radially elliptical is arranged at the center in the quartz body. The elliptical through hole is filled with polycarbonate to form an elliptical core region. Two symmetrical long-axis through holes and two symmetrical short-axis through holes are arranged in the outer periphery of the elliptical core region respectively. A number of small through holes are arranged on the outer circumference of a region enclosed by the long-axis through holes and the short-axis through holes. Four large through holes are arranged on the outer circumference of a region enclosed by a number of small through holes. Large through holes, small through holes, long-axis through holes and short-axis through holes are sequentially reduced in diameter. According to the invention, the organic material polycarbonate is filled into the elliptical through hole in the quartz body of the optical fiber to form the elliptical core region, so as to destroy the symmetry design of acladding structure; and the advantages of high birefringence, high pressure sensing sensitivity, high precision, high stability, small size and easy integration and processing are realized.

Description

technical field [0001] The invention relates to an optical fiber communication technology, in particular to an optical fiber sensing technology, in particular to a high-sensitivity pressure sensing photonic crystal optical fiber and a pressure sensor thereof. Background technique [0002] As a pressure measurement technology, pressure sensing mainly includes electrical and optical fiber sensors. Electrical sensors can demodulate the relationship between pressure and electrical signals by converting pressure signals into voltage or current signals. Due to its small structure, high sensitivity and long life, fiber optic sensors are used to replace electrical sensors in harsh environments such as strong electromagnetic interference, high knocking and flammability. [0003] With the development of optical fiber communication technology, optical fiber sensing technology has become a hot research direction and is developing rapidly. When light is transmitted in the optical fiber,...

AI Technical Summary

Problems solved by technology

[0006] Because the traditional optical fiber has a solid core structure, and the Young's modulus of the quartz material is very large, the deformation of the optical fiber is very small under the action of pressure, resulting in the problem of small deformation of the pressure sensor and low pressure sensitivity; in addition, the main component of the traditional optical fiber is two Silicon oxide, which is a brittle and fragile material, has poor bending resistance, poor toughness, large bending loss, and poor temperature stability, and it is difficult to improve the sensing performance by improving the optical fiber structure

Images