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Proceedings Paper

Experimental investigation of salinity measurement based on optical-electrical dual-differential methods
Author(s): Yong Zhao; Bo Zhang; Yanbiao Liao; Shurong Lai
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Paper 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.

Paper Details

Date Published: 9 September 2002
PDF: 5 pages
Proc. SPIE 4920, Advanced Sensor Systems and Applications, (9 September 2002); doi: 10.1117/12.482024
Show Author Affiliations
Yong Zhao, Tsinghua Univ. (China)
Bo Zhang, Tsinghua Univ. (China)
Yanbiao Liao, Tsinghua Univ. (China)
Shurong Lai, Tsinghua Univ. (China)

Published in SPIE Proceedings Vol. 4920:
Advanced Sensor Systems and Applications
Yun-Jiang Rao; Julian D. C. Jones; Hiroshi Naruse; Robert I. Chen, Editor(s)

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