Optics: measuring and testing – For size of particles – By particle light scattering
Patent
1983-06-20
1985-09-10
Willis, Davis L.
Optics: measuring and testing
For size of particles
By particle light scattering
356 285, 356343, G01N 1502
Patent
active
045402833
ABSTRACT:
An apparatus and method for determining the size and velocity of particles, droplets, bubbles, or the like employing laser light scattering is disclosed. A laser generation means is provided for generating a pair of coherent laser beams. These beams are directed along an axis and are caused to cross the axis at an angle to establish a sample volume. A collection means for sensing the scattering caused by particles, droplets, bubbles or the like within the sample volume is provided. The collected scattered signals are directed onto photo-detectors which are coupled to a signal phase determining means for determining the phase of the scattered signals as the particle, droplet, bubble or the like passes through the sample volume. Sizing means are coupled to the signal phase determining means for determining the size of the particle, droplet, bubble or the like from phase changes and the scattered signal. The velocity of the particle, droplet, bubble or the like is determined using well known laser Doppler anemometry techniques. In addition, the present invention discloses a method to determine the direction of motion of a particle, droplet, bubble or the like passing through the sample volume.
REFERENCES:
patent: 4329054 (1982-05-01), Bachalo
patent: 4387993 (1983-06-01), Adrian
Farmer, "Measurement of Particle Size, Number Density, and Velocity Using a Laser Interferometer", Applied Optics, vol. 11, No. 11, pp. 2603-2612, 11/72.
Holz et al., "Tracking Bacterial Movements Using a One-Dimensional Fringe System", Optics Letters, vol. 2, No. 5, pp. 109-111, 5/78.
Bachalo, "Method for Measuring the Size and Velocity of Spheres by Dual-Beam Light-Scatter Interferometry", Applied Optics, vol. 19, No. 3, pp. 363-367, 2/80.
Blatt Jeffrey J.
Koren Matthew W.
Willis Davis L.
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