Investigation of liquid concentration measurement system by U-shaped fiber optic sensorChinese Full Text

ZHANG Na,FAN Naimei,CHEN Yan,WANG Fengqin (College of Computer and Communication Engineering, Zhengzhou University of Light Industry,Zhengzhou 450002,Henan,China)

Abstract: A U-shaped fiber optic system is designed and made to measure liquid concentration.Since laser light is highly monochromatic and liquid temperature is constant,the concentration of solution hereby is obtained from the measurement of electrical signal at the receiving terminal when optical signal occurs total internal reflection in the U-shaped sensing area.The experimental setup is extremely simple,which includes a laser diode coupled to a single-mode optic fiber,a U-shaped sensor probe,and a receiving terminal of light signal.Results are presented for NaCl and sugar aqueous solutions with high resolution on the order of 0.05%.At the same time,the experimental results are compared using different radius of curvature of U-shaped probe.The device is used to test liquid concentration of transparent and moderately absorbing liquid,and it has some merits,such as small,simply,high stability and inexpensive.The concentration measurements are in very good agreement with theoretical analysis which verifies the correctness and feasibility of the investigation.

Keywords：

optical measurement; liquid concentration; U-shaped fiber sensor; total internal reflection;

DOI：
10.13741/j.cnki.11-1879/o4.2011.04.013
Series：
Subject：
Classification Code：
TP212.14

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Investigation of liquid concentration measurement system by U-shaped fiber optic sensorChinese Full Text

ZHANG Na,FAN Naimei,CHEN Yan,WANG Fengqin (College of Computer and Communication Engineering, Zhengzhou University of Light Industry,Zhengzhou 450002,Henan,China)

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