Sensing optical fiber and optical fiber sensing device

Abstract

The invention provides a sensing optical fiber, and the optical fiber is a hollow anti-resonance optical fiber. The hollow anti-resonance optical fiber comprises a cladding region formed by a miniature capillary tube, a hollow tube, and a fiber core region which is surrounded by the cladding region. The hollow tube is disposed at an outer side of the cladding region in a cup joint manner. The refractive index of the fiber core region is lower than the refractive index of the cladding region. Each pre-selection position in each group of pre-selection positions on the side surface of the hollowtube is provided with a through hole, and all pre-selection positions in each group are arranged in the direction of the central axis of the sensing optical fiber. During the detection of various types of to-be-detected substances, the optical fiber can reduce the number of fusing and cutting times of the sensing optical fiber, reduces the workload of detection, and improves the accuracy of a detection result.

Description

technical field [0001] The invention relates to the technical field of optics and laser optoelectronics, more specifically, to a sensing optical fiber and an optical fiber sensing device. Background technique [0002] At present, with the development and progress of science and technology, optical fiber sensing technology has been widely used. Physical quantities such as temperature, pressure, flow, displacement, vibration, rotation, bending, liquid level, speed, acceleration, sound field, current, voltage, magnetic field and radiation are all sensed with different performances through optical fibers. [0003] Optical fiber sensing technology includes two functions of sensing and transmitting the substance to be measured. Sensing means that the external signal changes the physical characteristic parameters of the light wave transmitted in the optical fiber according to its changing law, such as intensity (power), wavelength, frequency, phase and polarization state, etc., an...

AI Technical Summary

Problems solved by technology

Since the sensing fiber needs to be reconnected every time a substance to be measured is detected, multiple times of fusion splicing and cutting of the sensing fiber will be performed when detecting a variety of substances to be measured, which will lead to Increased workload

At the same time, in the process of multiple fusion splicing and cutting of the sensing fiber, the loss of the sensing fiber interface will increase, resulting in errors in the detection results

Images