Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1982-09-07
1986-02-18
Willis, Davis L.
Optics: measuring and testing
By particle light scattering
With photocell detection
73 644, 356338, 356344, G01B 902
Patent
active
045710813
ABSTRACT:
A light scattering interfacial tension spectrometer has a laser source of light directed, as an incident beam I.sub.i, through a focusing lens and a diffraction grating. The grating divides the incident beam I.sub.i into a main beam I.sub.m, undiffracted light, and a higher order, diffracted light, reference beam I.sub.r. The beam I.sub.r is passed through an attenuator and a diffraction focusing lens to a region under test, such as a liquid surface. The main beam I.sub.m, from the grating is transmitted through the common diffraction focusing lens to the test region where it is reflected. The reference beam I.sub.r is reflected from the test surface together with scattered light I.sub.s, and directed through an aperture to a photomultipler tube. The output of the photomultiplier is coupled to a pulse amplifier-discriminator and a photon correlator. For a liquid surface under test the output of the spectrometer provides a measure of the surface tension and the viscosity of the liquid.
REFERENCES:
patent: 3090229 (1963-05-01), Chisholm
Josefowicz et al., "Homodyne Electrophoretic Light Scattering . . . " Applied Optics, vol. 14, No. 3, pp. 740-742.
Hood et al., "Laser Heterodyne Apparatus for Measurement . . . " J. Appl. Phys., vol. 47, No. 6, pp. 2433-2442, 6/76.
Byrne et al., "Photon Correlation Spectroscopy of Liquid Interfaces" . . . J. Phys. D., vol. 2, pp. 1133-1144, 1979.
Coulter Electronics of New England, Inc.
Kehoe Andrew F.
Koren Matthew W.
Willis Davis L.
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