Optical fiber tapering characteristic based system for detecting liquid refractive index in real time

Abstract

The invention discloses an optical fiber tapering characteristic based system for detecting liquid refractive index in real time. The system comprises a laser with a specific wavelength, an optical fiber sensor, a PIN tube, an amplification circuit, a collecting card, a computer, and a sample tank; wherein the optical fiber sensor is installed in the sample tank, the light with a specific wavelength is emitted by the laser and goes through the optical fiber sensor and PIN tube in sequence, then the signal detected by the PIN tube is processed by the amplification circuit and converted into an electrical signal, and the electrical signal is collected by the collecting card and then sent to the computer in the end. The optical fiber sensor is composed of a rectangular plastic plate and single mode fiber; the four angles of the plastic plate are all round angles, the single mode fiber is fixed on two round angles of the plastic plate through epoxy resin, and the contact positions between the plastic plate and the single mode fiber are melted to form a left cone area and a right cone area.

Description

technical field [0001] The invention relates to a liquid detection system, in particular to a system for real-time detection of liquid refraction index based on optical fiber tapered characteristics. Background technique [0002] In some beverage and dairy product factory assembly lines, it is often necessary to monitor the concentration of liquid in real time. However, due to the complex environment and many influencing factors, ordinary sensors cannot achieve the required accuracy and are subject to greater external interference. Moreover, if the factory uses manual monitoring to detect the liquid concentration, a large amount of manpower and material resources will be invested, which is not conducive to the development of the industry. [0003] Liquids with different concentrations correspond to different refractive indices, so as long as the measurement of the refractive index of the liquid is realized, the change of the liquid concentration can be monitored in real ...

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