Electro-optical method and system for in situ measurements of pa

Details Electro-optical method and system for in situ measurements of pa Electro-optical method and system for in situ measurements of pa

1975-03-05

1977-04-12

Corbin, John K.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

250574, G01N 2100

Patent

active

040171868

ABSTRACT:
A system and method provides electro-optical in situ measurements of the mass per unit volume of particulate matter suspended in a fluid medium. A beam of electromagnetic radiation is directed through a portion of the medium and radiation back-scattered from an optically defined volume thereof is detected and utilized to provide an indication of the mass of the particles per unit volume of the medium. The beam is preferably a periodically interrupted beam of substantially monochromatic light having a wavelength of the order of magnitude of the mean diameter of the particles of interest. In one embodiment, the d.c. component of the detection signal is filtered out to eliminate the effect of any background radiation.

REFERENCES:
patent: 3310680 (1967-03-01), Hasegawa
patent: 3524707 (1970-08-01), Hansen, Sr. et al.
patent: 3563661 (1971-02-01), Charlson et al.
patent: 3782824 (1974-01-01), Stoliar

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