Reflective intensity modulation (RIM) optical fiber sensor unequally spaced misalignment type compensation structure

Abstract

The invention provides a reflective intensity modulation (RIM) optical fiber sensor unequally spaced misalignment type compensation structure, which comprises a sending optical fiber and two layers ofreceiving optical fiber groups. The structure of the invention is characterized in that the sending optical fiber and receiving optical fibers of each layer of receiving optical fiber group are arranged at an equal distance and not in the same plane; the end face of the sending optical fiber forms a misalignment quantity with the end face of the first layer of the receiving optical fiber group; the sending optical fiber and the first layer of the receiving optical fiber group constitute a reference light path; the end face of the first layer of receiving optical fiber group and the second layer of receiving optical fiber group form a misalignment quantity at the end face, and the sending optical fiber and the second layer of receiving optical fiber group constitute a measurement light path; and the sending optical fiber transmits a light source to a measured surface, and the light source is received by the two layers of receiving optical fiber groups after being reflected and is transmitted to a photoelectric detector which converts the light source into an electrical signal to be output. The optical fiber sensor compensation structure of the invention is an unequally spaced misalignment type and, combined with a two-circle coaxial probe structure, can effectively improve the linearity, sensitivity and range of measurement and eliminate measurement dead zones.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a reflection type intensity modulation type optical fiber sensor with unequal distance dislocation compensating structure. Background technique [0002] Optical fiber sensor is a new type of sensor developed rapidly in the 1970s. In recent decades, with the continuous development of fiber optic technology, fiber optic sensor technology has matured in a variety of non-contact measurement systems. Reflective intensity modulation (RIM) fiber optic sensors are widely used in Surface topography measurement. [0003] Since the RIM fiber optic sensor measures the topography of the measured surface through the change of light intensity, it must be affected by the fluctuation of the power of the light source. In addition, the reflectivity of the reflective surface is different, and the transmission loss of the optical fiber will cause a certain error to the mea...

AI Technical Summary

Problems solved by technology

In addition, the reflectivity of the reflective surface is different, and the optical fiber transmission loss will cause a certain error to the measurement system; therefore, to improve the measurement accuracy of the system, it is necessary to adopt intensity compensation technology to eliminate the interference of environmental factors

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