Photometer

Details Photometer Photometer

1976-09-20

1978-09-12

Engle, Samuel W.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

250574, G01N 2100, G01N 2126

Patent

active

041133862

ABSTRACT:
The forward light scattering photometer for analyzing particles dispersed in a fluid includes a cylindrical housing enclosing a pair of axially spaced, spherical-surfaced, bi-convex lenses which provide axial focusing of the lamp image in an intermediate light scattering chamber through which the sample being analyzed is flowed. Such lenses provide axial focusing with no circumferential aberations and only radial aberations. Light traps having radial borders, such as semicircular blank off discs, are located on the upstream or lamp side of each lens to provide an image having sharp radial edges, thereby eliminating the need for high quality lenses adapted to correct for spherical aberations.
The lenses are shielded from contamination by particles from the sample by a stream of purge air introduced into the housing at a location near each lens and tangentially with the housing bore so as to create a stable vortexing flow of the purge air in the vicinity of each lens.

REFERENCES:
patent: 2812686 (1957-11-01), Sinclair
patent: 3231748 (1966-01-01), Haessler
patent: 3361030 (1968-01-01), Goldberg
patent: 3787122 (1974-01-01), Lepper

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