Apparatus and method for measuring refractive index

Details Apparatus and method for measuring refractive index Apparatus and method for measuring refractive index

1983-05-17

1986-02-18

Willis, Davis L.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356361, G01N 2145

Patent

active

045710821

ABSTRACT:
An interference refractometer of the Jamin type includes a beam splitter (14) arranged to split light from a laser source (12) into two partial beams B.sub.M, B.sub.R one of which passes through a test cell (20) adapted to contain a fluid medium. One component (B.sub.R) of the reference partial beam passes through a phase plate which introduces a 90 degree phase shift. The partial beams are detected by photodetectors (38, 44, 46) the outputs of which are coupled to counter circuits (not shown) to provide an output which is independent of changes in the mean level of the optical input signals.

REFERENCES:
patent: 3601490 (1971-08-01), Erickson
patent: 3625616 (1971-12-01), Lee
Namba, "Photoelectric Recording Interferometer for Gas Analysis", Rev. Sci. Instrum., vol. 30, No. 8, pp. 642-645, 8/59.
Hariharan et al., "Three-Beam Interferometer for Diffusion Measurements", J. Sci. Instrum., vol. 39, pp. 165-167, 4/62.

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