A fiber optic microbending sensor based on dual-core optical fiber

Abstract

The object of the present invention is to provide a kind of optical fiber micro-bending sensor based on dual-core optical fiber, comprising light source, single-mode fiber coupler, dual-core optical fiber, first optical power meter, second optical power meter, the light emitted by the light source passes through single-mode The fiber coupler is divided into two bundles. The two output ends of the single-mode fiber coupler are respectively connected to the two cores of the input end of the dual-core fiber. The two conducting single-mode fibers are transmitted to the first optical power meter and the second optical power meter, and the first optical power meter and the second optical power meter input the detected signals to the angle calculation circuit to obtain the bending angle of the two fiber cores. The invention reduces the distance between the two fiber cores and improves the coupling capability of the two fiber cores, thereby increasing the precision and sensitivity of the fiber microbending sensor.

Description

technical field [0001] The invention relates to a sensor, in particular to a sensor for measuring micro-bending angles. Background technique [0002] When light is transmitted in the optical fiber, the phase and amplitude of the light wave will change due to external temperature, pressure, vibration and other factors. The optical fiber sensor is a sensor that uses this basic principle to detect changes in physical quantities. Since the optical path of the optical fiber is closed, the optical fiber sensor is more suitable for measurement in harsh environments such as high temperature and high pressure, flammable, explosive, and corrosive conditions. Therefore, fiber optic sensors are widely used in aerospace, oil exploration, automatic control and other fields. [0003] The fiber optic microbend sensor is one of the devices that measures the tiny bending of objects. Environmental parameters such as pressure, velocity, strain, flow, etc. are measured by bending the optical f...

AI Technical Summary

Problems solved by technology

However, the optical fiber microbend angle sensor based on light intensity changes has low accuracy and sensitivity, especially in the case of small angles, the loss of transmitted light intensity changes less, and accompanied by light source power fluctuations, which greatly affects the microbend Angle measurement results

Images