Truly Nonintrusive Liquid-Level-Sensing Method Based on Lateral Displacement Effect of Light Rays

Author

Singh, Hiran Kumar ; Meitei, N.C. ; Sarkar, S.T. ; Tiwari, D. ; Bezboruah, Tulshi

Author_Institution

Dept. of Electron. & Commun. Technol., Gauhati Univ., Guwahati, India

Volume

13

Issue

2

fYear

2013

fDate

Feb. 2013

Firstpage

801

Lastpage

806

Abstract

A truly nonintrusive optical sensing method suitable for accurate and precise measurement of liquid level is proposed and demonstrated in this paper. Sensing principle of the proposed method is based on the phenomenon of lateral displacement effect, which is observed when oblique light rays propagate through material media with different thicknesses and refractive indices. Experimental results of this method demonstrate its ability to measure liquid level very precisely up to a resolution of about 40-50 μm. The proposed method has the potential for use in in situ measurement of liquid level and volume. It can also be exploited for measurement of refractive index of liquid.

Keywords

displacement measurement; level measurement; light propagation; optical materials; optical sensors; refractive index measurement; thickness measurement; lateral displacement effect; liquid level measurement; material media; oblique light ray propagation; refractive index measurement; thickness index; truly nonintrusive liquid-level-sensing method; truly nonintrusive optical sensing method; Containers; Liquids; Optical fiber sensors; Optical fibers; Pollution measurement; Sensitivity; Displacement; level; liquid; nonintrusive; optical; transparent; volume;

fLanguage

English

Journal_Title

Sensors Journal, IEEE

Publisher

ieee

ISSN

1530-437X

Type

jour

DOI

10.1109/JSEN.2012.2227594

Filename

6353494