New type of liquid refractometer

Su, Der Chin; Lee, Ju Yi; Chiu, Ming Horng

doi:10.1117/1.601818

Cited by 17 publications

(2 citation statements)

References 4 publications

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“…Many approaches have been developed to perform refractive index measurements, including critical angle measurements like the Abbé refractometer, phase detection in total-internal reflection (TIR) [1][2][3][4], phase shift interferometry (PSI) [5], and resonant angle or phase detection in surface plasmon resonance (SPR) [6], among others. Among these methods, the best resolution can be achieved with the SPR method, which reaches 10 -7 (RIU: refractive index unit) or less.…”

Section: Introductionmentioning

confidence: 99%

Full-Field Refractive Index Variation Measurement Based on Phase Shift Interferometry and SPR Phase Detection

Lin

Chiu

2017

AMM

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We propose a new approach for determining the distribution of full-field refractive index based on the angle deviation method (ADM) with a surface plasmon resonance (SPR) sensor in phase detection. The inhomogeneous distribution of refractive index causes the variant deviation angles in the test light. SPR sensor is a sensitive angular sensor especially for phase detection. For the full–field phase measurement, we should use the four-step phase shift interferometry (PSI) to measure the phase shift profile of the test light after reflected from the SPR sensor. Thus the phase shift is caused by the variation of the refractive index. The approach can plot the full-field refractive index distribution in a short time and its resolution can be better than 2.2×10-8 (RIU).

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Section: Introductionmentioning

confidence: 99%

Full-Field Refractive Index Variation Measurement Based on Phase Shift Interferometry and SPR Phase Detection

Lin

Chiu

2017

AMM

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“…The proposed method determines a specific V number using the phase method with a simplified optical system for easier operation. Since 1997, Chiu et al 29 and Su et al 30 have proposed a phase method based on commonpath heterodyne interferometry for measuring the refractive indices of liquids or prisms. We used this approach with three-wavelength sources to measure the chromatic dispersion and determine the type of prism material in this paper.…”

Section: Introductionmentioning

confidence: 99%

Phase geographical map for determining the material type of a right-angle prism

Chiu

Lai

Wang³

et al. 2006

Appl. Opt.

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A phase geographical map for determining a right-angle prism is presented. The proposed method is based on total-internal-reflection effects and chromatic dispersion. Under the total-internal-reflection condition, the phase difference between the S and P polarizations, as a function of the wavelength and refractive index, can be extracted and measured using heterodyne interferometry. Various wavelengths correspond to various refractive index values. The proposed map is convenient in ensuring the prism material using a specific V number. The method has the following merits: high stability, ease of operation, and rapid measurement.

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A method for measuring two‐dimensional refractive index distribution by using Fresnel equations and phase‐shifting interferometry

Hsieh

Jian

Chen

et al. 2008

Phys. Status Solidi (c)

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Based on Fresnel equations and the phase‐shifting interferometry, an alternative method for measuring the two‐dimensional refractive index distribution of a material is presented. A linearly polarized light passes through a quarter wave‐plate and is incident on the tested material. The reflected light propagates through an analyzer, and then the interference signal can be obtained. The special equations to estimate the phase of the interferometric signal can be derived by using Fresnel equations. Next, the associated two‐dimensional phase distribution is measured by the four‐step phase‐shifting interferometry. Then, the measured data are substituted into the special equations derived previously, and the two‐dimensional refractive index distribution of the tested material can be obtained. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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New type of liquid refractometer

Cited by 17 publications

References 4 publications

Full-Field Refractive Index Variation Measurement Based on Phase Shift Interferometry and SPR Phase Detection

Full-Field Refractive Index Variation Measurement Based on Phase Shift Interferometry and SPR Phase Detection

Phase geographical map for determining the material type of a right-angle prism

A method for measuring two‐dimensional refractive index distribution by using Fresnel equations and phase‐shifting interferometry

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