Experimental investigation of salinity measurement based on optical-electrical dual-differential methods

Yong Zhao; Bo Zhang; Yanbiao Liao; Shurong Lai

doi:10.1117/12.482024

9 September 2002 Experimental investigation of salinity measurement based on optical-electrical dual-differential methods

Yong Zhao, Bo Zhang, Yanbiao Liao, Shurong Lai

Author Affiliations +

Proceedings Volume 4920, Advanced Sensor Systems and Applications; (2002) https://doi.org/10.1117/12.482024
Event: Photonics Asia, 2002, Shanghai, China

Abstract

Experimental setup of a reflex dual-differential sensor for salinity measurement is developed. The sensor exploits the beam deviation due to optical refraction at the receiving end face of the measurement cell, which is caused by changes in refractive index with different concentration of salt water. With the help of a right-angle reflecting prism and in the presence of a referenced distilled water cell with an inclined optical window, optical differential measurement of incident beam deviations is implement, and the deviation caused by changes in salinity will be detected by a PSD with an electrical differential signal processing technique. Experimental setup and measurement principle are discussed. Salinity measurement based on this method avoids the influences by intensity fluctuation of the incident light and temperature drift. Preliminary experimental results indicate that the estimated salinity measurement resolution can reach 0.02 ‰ depending on the performance of PSD.

Citation Download Citation

Yong Zhao, Bo Zhang, Yanbiao Liao, and Shurong Lai "Experimental investigation of salinity measurement based on optical-electrical dual-differential methods", Proc. SPIE 4920, Advanced Sensor Systems and Applications, (9 September 2002); https://doi.org/10.1117/12.482024

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