Particle evaluator

Details Particle evaluator Particle evaluator

1975-12-22

1978-06-20

Clark, Conrad J.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

356181, 250574, 350 95, G01N 2100, G01N 2118, G02B 2134

Patent

active

040957756

ABSTRACT:
The invention is employed for evaluating particles, such as droplets of aerosol sprays suspended in a gaseous medium. A stream of the particles to be analyzed is flowed into a narrow sample zone across the optical axis of a beam of light. Scattered radiation from the particles is focused on the image plane in which a photosensitive surface is located. Images of particles formed there are reproduced on a fluorescent or phosphorescent display screen of a cathode ray tube. A scale on the screen is employed for measuring the dimensions of the particles. The confinement of the stream of the mixture to about the depth of focus of the objective lens of the camera reduces effects of out-of-focus particles and permits evaluation of individual particles.

REFERENCES:
patent: 3609043 (1971-09-01), Simmons et al.
patent: 3614231 (1971-10-01), Sharn
patent: 3646352 (1972-02-01), Bol et al.
patent: 3720470 (1973-03-01), Berkham

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