Reflection type spiral optical fiber liquid level sensor

Abstract

The invention discloses a reflection type spiral optical fiber liquid level sensor which comprises a sensor fixing seat, a receiving optical fiber, a plurality of incident optical fibers and a concave reflecting mirror. The sensor is characterized in that the incident optical fiber is spiral; the upper part of the sensor fixing seat is a solid body, the lower part of the sensor fixing seat is a hollow body, a receiving optical fiber mounting hole is formed in the center of the solid body along the axial direction, and a plurality of incident optical fiber mounting holes are uniformly formed in the outer side of the receiving optical fiber mounting hole along the circumferential direction; the rear end of the receiving optical fiber and the rear ends of all the incident optical fibers enter the hollow body of the sensor fixing seat through the receiving optical fiber mounting hole and the incident optical fiber mounting holes respectively; and the concave reflecting mirror is arranged in the hollow body of the sensor fixing seat and located on the rear side of the incident optical fibers and the receiving optical fiber, and the liquid level sensor can be widely applied to liquid level on-line distributed measurement of various kinds of liquid.

Description

technical field [0001] The invention relates to a sensor, in particular to a reflective spiral optical fiber liquid level sensor. Background technique [0002] Liquid level sensing has wide demand and important applications in fuel storage, industrial production and other fields. At present, the detection of liquid level is mainly based on sensors developed by electrical, mechanical, ultrasonic, optical fiber and other technologies. Although the measurement results of electrical, mechanical and ultrasonic sensors have high stability, the measurement process will be affected by the liquid level depth and working fluid parameters. At the same time, the sensor has a measurement blind area, which is difficult to apply to flammable, explosive and corrosive liquid levels. detection. The optical fiber sensor has significant advantages such as anti-electromagnetic interference, acid and alkali corrosion resistance, long service life, large measurement range, high resolution, and h...

AI Technical Summary

Problems solved by technology

Although the light-leakage optical fiber liquid level sensor has many advantages, the light-leakage optical fiber liquid level sensor often needs to remove the cladding or part of the fiber core to improve the detection sensitivity of the sensor, which increases the complexity of the sensor preparation process and reduces the optical fiber machinery. Performance and service life; more importantly, when the fiber cladding is removed, the fiber core is directly exposed to the liquid phase, which will cause the substances in the liquid phase to directly adhere to the surface of the fiber core, or even diffuse into the fiber core , causing changes in the optical transmission characteristics of the optical fiber, resulting in poor repeatability, low accuracy, and limited service life of the sensor measurement results

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