A method for measuring the complex refractive index of a turbid medium

Zhi-Cheng Jian; Jiun-You Lin; Po-Jen Hsieh; Huei-Wen Chen; Der-Chin Su

doi:10.1117/12.612482

13 June 2005 A method for measuring the complex refractive index of a turbid medium

Zhi-Cheng Jian, Jiun-You Lin, Po-Jen Hsieh, Huei-Wen Chen, Der-Chin Su

Proceedings Volume 5856, Optical Measurement Systems for Industrial Inspection IV; (2005) https://doi.org/10.1117/12.612482
Event: Optical Metrology, 2005, Munich, Germany

Abstract

Based on the heterodyne interferometry and Fresnel equations, an alternative method for measuring the complex refractive index of a turbid medium. A light beam is incident on the boundary between a right-angle prism and a turbid medium. The phase difference between s- and p- polarizations of the reflected light occurs. The phase difference depends on then incident angle and the complex refractive index of a turbid medium; their relation can be derived from Fresnel equations. The phase difference can be measured accurately with the heterodyne interferometry. Because there are two unknown parameters to be estimated, at least the phase differences under two different conditions should be measured. Then, these measured data are substituted into the derived relation, and a set simultaneous equation is obtained. If the simultaneous equation is solved, the complex refractive index can be estimated. Because the reflected light from the boundary is measured, the scattering noises coming from the turbidity of the tested medium can be greatly reduced. In addition, this method has some merits such as simple optical setup, high sensitivity, high stability, and suitability for a little amount of the tested medium in its native state (without dilution).

Citation Download Citation

Zhi-Cheng Jian, Jiun-You Lin, Po-Jen Hsieh, Huei-Wen Chen, and Der-Chin Su "A method for measuring the complex refractive index of a turbid medium", Proc. SPIE 5856, Optical Measurement Systems for Industrial Inspection IV, (13 June 2005); https://doi.org/10.1117/12.612482

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KEYWORDS

Refractive index

Heterodyning

Prisms

Light sources

Amplifiers

Interferometry

Polarization

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