Optics: measuring and testing – For size of particles – By particle light scattering
Patent
1983-10-12
1986-06-17
Rosenberger, R. A.
Optics: measuring and testing
For size of particles
By particle light scattering
356343, G01N 1502
Patent
active
045952914
ABSTRACT:
A particle diameter measuring device for measuring the particle diameter distribution of a number of particles to be measured, wherein a laser beam guided through a radiating optical fiber is re-formed by collimator lenses into parallel beams having an adequate diameter and is then irradiated onto the particles to be measured; a plurality of optical fibers are arranged along a circle whose center is a point P located in the particles, the receiving end of any of the optical fibers being directed toward point P. The optical fibers receiving the scattered light are arranged close to one another in the range of small scattering angles, while they are roughly arranged in the range of large scattering angles. A transmitted light enters into that optical fiber which is so arranged as to coincide with the laser beam incident direction, the intensity of this transmitted light being detected by a photodetector. Light scattered at various angles, which angles are formed with reference to the laser beam incident direction, is received by the other optical fibers, their intensities being detected by the other photo-detectors. The transmission factor t=Iout/Iin in calculated from the intensity of the transmitted light. The particle diameter distribution n(D) is calculated in the form of relative values, using the angular distribution I(.theta.) of the scattered light intensity. The particle diameter distribution N(D) is calculated in the form of absolute values, using t, n(D) and light pass length L. On the while, particle diameter distribution N(D) or n(D) can be measured with high accuracy, independently of the diameter of the particles. Since it is easy to measure the scattered light intensities in a range of scattering angles from 0.degree. to 30.degree., the particle diameter distribution of particles, the diameter thereof are smaller than 0.1 .mu.m, can be obtained.
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AIAA Paper No. 76-69, A Laser Diagnostic Technique for the Measurement of Droplet and Particle Size Distribution, 1976.
The 1st International Conference on Liquid Atomization and Spray Systems, A Light Scattering Technique for Determining Droplet Size Distributions in Two-Phase Liquid-Dominated Nozzle Jets, Alger et al., (1978).
Rosenberger R. A.
Tokyo Shibaura Denki Kabushiki Kaisha
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