Quasi-distributed optical fiber concentration sensor

Abstract

A quasi-distributed optical fiber concentration sensor, which consists of a broadband ASE light source, an optical fiber coupler, a dielectric film filter type wavelength division multiplexer B1~Bn, an optical fiber sensor head G1~Gn, an array waveguide grating, a photodiode probe, an array photoelectric The diode probes T1-Tn, the transmission optical fiber and the circuit processing unit are jointly connected to form a structure. The sensor can realize distributed concentration measurement, has the ability of real-time online and remote detection, large measurement range, high sensitivity, strong stability and convenient operation.

Description

(1) Technical field [0001] The invention relates to a quasi-distributed optical fiber concentration sensor, in particular to a quasi-distributed optical fiber concentration sensor system based on Fresnel reflection, which belongs to novel optical fiber sensing technology. (2) Background technology [0002] The concentration of the solution is one of the main parameters to characterize the characteristics of the solution. In the fields of biochemistry, environmental protection, medical treatment and food processing, the measurement and control of the concentration of the solution plays a very important role in the modern industrial production process. It is to ensure and improve product quality. important technical means. Therefore, many methods for measuring the concentration of solutions have emerged. Traditional measuring instruments include commercial polarimeters, colorimeters, Abbe refractometers, etc., as well as measurement methods such as broadband absorption spectr...

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Problems solved by technology

Traditional measuring instruments include commercial polarimeters, colorimeters, Abbe refractometers, etc., as well as measurement methods such as broadband absorption spectroscopy, titration, and fluorescence quenching, but most of these methods are limited to the visible light range and are The sampling method cannot be monitored in real time

Subsequently, some new technologies such as photoacoustics, fiber gratings, SPR sensors and Raman spectroscopy have emerged, but these methods are expensive and not easy to operate

Most of the current optical fiber concentration sensing methods are non-selective or the optical fiber has no sensing effect and is only used as a means of light transmission, especially in the continuous detection and control of online solution concentration. It is still in a relatively backward state. And the above methods are all Difficult to achieve distributed real-time measurement

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