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《Optical Technique》 2012-05
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Precised measurement of liquid concentration based on Fresnel-reflection

ZHANG Na,HE Yan,ZHANG Yan,YANG Xuedong(College of Computer and Communication Engineering,Zhengzhou University of Light Industry,Zhengzhou 450002,China)  
A new method to measure liquid concentration based on Fresnel-reflection is presented.The experimental setup is extremely simple,which includes a laser diode,three fiber couplers,and two photodetectors.The light is sent to the diode source pass through three couplers and is reflected by the sensor-liquid interface.The reflected light is then detected by the two photodetectors.The concentration of liquid is obtained from the measured value of relative reflection intensity as a result of relative technique,which can eliminate the influence of light source fluctuation and environment interfere.Results are presented for salt and sucrose solutions,which prove that the concentration measurements are in very good agreement with theoretical analysis.The whole measurement setup can get 99% measurement stability with simple configuration,high precision and easy to operation.
【CateGory Index】: TN29;TP274
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