Minitype F-P reflective index sensor of full optical fiber ring-type reflecting surface structure

Abstract

The invention discloses a minitype F-P reflective index sensor of a full optical fiber ring-type reflecting surface structure, which comprises a general mono-mode optical fiber, a large-core diameter hollow-core optical fiber and an optical fiber with a through hole at the center which are welded and fixed in succession; the large-core diameter hollow-core optical fiber and the optical fiber with the through hole at the center are communicated; the contact surface of the optical fiber with the through hole at the center and the large-core diameter hollow-core optical fiber forms the ring-shaped reflecting surface; the invention has the beneficial technical effects that the invention provides the novel reflective index sensor which is simple to manufacture, small in volume and high in measurement accuracy, and has wide application range and strong capability of resisting disturbance.

Description

technical field [0001] The invention relates to an optical sensing technology, in particular to a miniature F-P refraction index sensor with an all-optical ring reflective surface structure and a manufacturing method thereof. Background technique [0002] Refractive index has important uses in chemical industry, medicine, food, petroleum, coal mine and other industrial sectors. The basic principle is that different substances mixed in different proportions have different refractive indexes. Therefore, in industry, measuring the refractive index of mixtures (mainly liquids and gases) can obtain the concentration of each component, that is, the amount of content. For example, the concentration of sugar in syrup in the sugar industry; the concentration of various reaction substances in the chemical reaction tank, such as some toxic gases, carbon monoxide, sulfur dioxide, etc.; the detection of gas concentration in the coal mine industry, etc. [0003] Typical measurement metho...

AI Technical Summary

Problems solved by technology

The refractometer based on long-period fiber grating has high sensitivity, but because the long-period fiber grating is greatly affected by its own bending, its reliability is greatly reduced

The optical fiber gas sensor based on the evanescent wave field can effectively monitor the leakage of gas and liquefied petroleum gas in mines, but the bare optical fiber used in it is easily polluted, which is a difficult problem to be solved

The refractometer based on the end surface of the Fappa cavity measures the refractive index of the measured object through the change of the contrast of the Fappa cavity. Compared with the traditional refractive index sensor, its biggest advantage is that it is small in size, but the contrast of the Fappa cavity is easily affected. The influence of the light source, and the accuracy is average

Images