New type liquid refractometer based on multiple total-internal reflections in heterodyne interferometry

Author

Shinn-Fwu Wang ; Cheng-Lung Hsu ; Chih-Ju Lin ; Chun-Wei Huang ; Chin-Hsiang Hsieh

Author_Institution

Dept. of Electron. Eng., Ching Yun Univ., Jhongli, Taiwan

fYear

2009

fDate

5-7 May 2009

Firstpage

707

Lastpage

710

Abstract

A new type liquid refractometer based on multiple total-internal reflections in heterodyne interferometry is proposed. The sensing unit of the new-type liquid refractometer is an elongated prism, i.e., a parallelogram prism. With the new-type refractometer, we can achieve the refractive index for the tested medium only by measuring the variation in phase difference between s-and p-polarization states at the total-internal reflection effect. Its resolution can 1 × 10^-6 refractive index unit (RIU). The new-type liquid refractometer has some merits, e.g., a simple optical setup, high resolution, high sensitivity, rapid measurement, and high stability.

Keywords

light interferometry; light polarisation; light reflection; optical prisms; optical sensors; refractive index measurement; refractometers; elongated prism; heterodyne interferometry; liquid refractometer; multiple total-internal reflection; parallelogram prism; refractive index; sensing unit; Optical interferometry; Optical mixing; Optical reflection; Optical refraction; Optical sensors; Optical variables control; Phase measurement; Refractive index; Stability; Testing; Heterodyne Interferometry (HI); Multiple Total-Internal Reflections (MTIRs);

fLanguage

English

Publisher

ieee

Conference_Titel

Instrumentation and Measurement Technology Conference, 2009. I2MTC '09. IEEE

Conference_Location

Singapore

ISSN

1091-5281

Print_ISBN

978-1-4244-3352-0

Type

conf

DOI

10.1109/IMTC.2009.5168541

Filename

5168541