Refractive index measurement of absorbing and turbid fluids by reflection near the critical angle

A method is described for measuring the specular optical reflectance R(\#ph\) of the interface between a fluid and a glass prism, the incident and reflected light being in the glass, and the angle of incidence \#ph\ being varied about the critical angle. Transparent, absorbing and some turbid fluids...

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Bibliographic Details
Published in:Measurement science & technology 1995-02, Vol.6 (2), p.214-221
Main Authors: Meeten, G H, North, A N
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Optical instruments, equipment and techniques
Optical methods
sonography
Physics
Refractometers and reflectometers
Rheology
Techniques and apparatus
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Summary:A method is described for measuring the specular optical reflectance R(\#ph\) of the interface between a fluid and a glass prism, the incident and reflected light being in the glass, and the angle of incidence \#ph\ being varied about the critical angle. Transparent, absorbing and some turbid fluids gave R(\#ph\) close to theoretical predictions. Other turbid fluids gave R(\#ph\) data that differed strongly from theoretical expectation. (Original abstract-amended)
ISSN:0957-0233
1361-6501
DOI:10.1088/0957-0233/6/2/014