Optics: measuring and testing – For size of particles – By particle light scattering
Patent
1989-05-22
1990-07-10
Willis, Davis L.
Optics: measuring and testing
For size of particles
By particle light scattering
356339, G01N 1502, G01N 2149
Patent
active
049403265
ABSTRACT:
An optical system for irradiation comprising a light source, a lens, an optical fiber, a rectangular waveguide, an objective lens and a prism and an optical system for receiving light comprising an objective lens, an aperture and an optical fiber are arranged with their optical axes intersecting one another at a point P in a measuring volume. In the optical system for irradiation, the light emitted from the optical fiber and having an intensity distribution expressed by a normal distribution curve is changed to a light having a uniform intensity distribution and a rectangular cross section, which is irradiated through the prism to the point p in the measuring volume. A light scattered at an angle of 90.degree. by a particle flowing through the measuring volume is guided through the optical system for receiving light to a photodetector which converts the scattered light to an electric signal (current) called a scattered light pulse. An arithmetic unit calculates the particle size from the height of this scatterd light pulse and the flow speed from the pulse width.
REFERENCES:
patent: 3476463 (1969-11-01), Kreuzer et al.
patent: 3960449 (1976-06-01), Carleton
patent: 4595291 (1986-06-01), Tatsuno
patent: 4600302 (1986-07-01), Sage, Jr.
Applied Optics, vol. 20, No. 5, P879; M. Quintanilla and A. M. de Frutos, "Holographic Filter that Transforms a Gaussian into a Uniform Beam".
"Determination of Droplet Sizes and Wetness Fraction in Two-Phase Flows Using a Light-Scattering Technique (High Pressure Live Steam of Nuclear Power Plants, Low Pressure Steam Turbines, Cooling Tower Plumes", J. Mech. Eng. Sci.; A. Ederhof; (1976).
Kabushiki Kaisha Toshiba
Koren Matthew W.
Willis Davis L.
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