Photometric apparatus

Details Photometric apparatus Photometric apparatus

1981-05-29

1984-12-18

Arnold, Bruce Y.

Optics: measuring and testing

By particle light scattering

With photocell detection

250564, 356226, 356228, G01N 2100, G01J 142

Patent

active

044888120

ABSTRACT:
A photometric analyzer and method are disclosed for analyzing particle containing samples. More particularly, a nephelometric apparatus and method are disclosed for analyzing baceteria samples. In the disclosed embodiment, the bacteria count of a bacteria sample is determined by photometrically comparing the sample to another sample having a known particle or bacteria concentration. Thus, in accordance with the invention, samples having a known bacteria count may be quickly and easily obtained from a "go" "no-go" test. The bacteria samples obtained according to the invention may be used as standardized bacteria concentrations for conducting Kirby-Bauer dilution tests.

REFERENCES:
patent: 2769365 (1956-11-01), Loeschcke et al.
patent: 3185975 (1965-05-01), Kompelien
patent: 3361030 (1968-01-01), Goldberg
patent: 3549893 (1970-12-01), Gibbs
patent: 3873206 (1975-03-01), Wilcock
patent: 3990851 (1976-11-01), Gross et al.
patent: 4027973 (1977-06-01), Kaye
patent: 4037965 (1977-07-01), Weiss
patent: 4072421 (1978-02-01), Coyne et al.
patent: 4077724 (1978-03-01), Briggs
patent: 4176953 (1979-12-01), Bartoov et al.
Schimizu, K. and Ishimaru, A., "Scattering Pattern Analysis of Bacteria", Optical Engineering, vol. 17, No. 2, Mar.-Apr. 1978, pp. 129-134.

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