Optical fluid analyzing apparatus and method

Details Optical fluid analyzing apparatus and method Optical fluid analyzing apparatus and method

1981-09-30

1984-03-13

Rosenberger, R. A.

Optics: measuring and testing

Refraction testing

356361, G01N 2141

Patent

active

044364202

ABSTRACT:
An optical fluid analyzing apparatus is shown comprising transparent means (12,13) of known refractive index (n.sub.1) providing a cell (14) for receiving a fluid sample of unknown refractive index (n.sub.2). A diffraction grating 10 is formed in an inner wall (11) of the cell. A light source (15) is positioned at an incident angle (.theta..sub.0) with a grating to satisfy the Bragg condition. A pair of detectors (16, 17) intercept the 0th order and 1st order diffracted light. Circuitry (18) responds to signals generated by the detectors to provide an output indicative of the refractive index of the sample.

REFERENCES:
patent: 3499712 (1970-03-01), Kottle et al.
patent: 4188123 (1980-02-01), Kleinknecht
Levi, Leo. Applied Optics; A Guide to Optical System Design/vol. 2, Wiley & Sons, New York, copyright 1980, pp. 268-271.
"Diffraction Refractometer" by A. B. Nafarrate, IBM Technical Disclosure Bulletin, vol. 13, No. 1, Jun. 1970.
"Fundamentals of Optics" by F. A. Jenkins et al., McGraw-Hill Book Co., Inc., 1957, Third Edition.

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