Technique for simultaneous particle size and velocity measuremen

Details Technique for simultaneous particle size and velocity measuremen Technique for simultaneous particle size and velocity measuremen

1978-06-29

1981-02-17

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356335, G01N 1506

Patent

active

042517338

ABSTRACT:
Two beams of electromagnetic radiation with symmetric radial intensity distributions are directed through space. A particle sampling volume is defined by those portions of the two beams within the field of view of one or more radiation sensitive detectors. The detectors respond to scattered radiation or fluorescence from particles passing through the beams in the sampling volume. The detector output for a single particle indicates two signal pulses corresponding to those times when the particle was in one of the beams. The speed of the particle in the plane perpendicular to the beams is determined from the transit time or width of the signal pulses, and the angle of the particle traverse in that plane determined from the time-of-flight between the signal pulses. The speed and angle thereby determine two velocity components in the perpendicular plane. Then the exact particle trajectory is specified by the angle and one point on the trajectory which is determined from relative magnitudes of the signal pulses. This allows calculation of the radiation intensity incident on the particle throughout the trajectory from known radiation beam properties. A device then responds to the signal pulses to indicate the size or other physical properities of the particle without the ambiguity present if the incident radiation intensity is unknown.

REFERENCES:
patent: 4071298 (1978-01-01), Falconer
patent: 4095775 (1978-06-01), Hotham
patent: 4110043 (1978-08-01), Eisert

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