In situ chlorophyl absorption meter

Details In situ chlorophyl absorption meter In situ chlorophyl absorption meter

1994-08-03

1995-06-13

Warden, Robert J.

Optics: measuring and testing

By shade or color

Fluid color transmission examination

356419, 356440, 250573, 250576, 7317033, G01N 2185, G01N 1506, G01N 100

Patent

active

054248400

ABSTRACT:
An absorption meter determines concentration of chlorophyll a and pheophytin in liquids. Particularly, an immersible absorption meter has a light source, a reflective flow tube, a signal detector, and means for determining the difference between the absorption coefficients at a first wavelength and a second wavelength. The light source may further include a plurality of filters and a selector that selects the filters. The concentration of substances in liquids is determined by measuring the absorption of light at a first wavelength and at a second wavelength, determining the difference between the absorption coefficients for the first and second wavelengths, and converting this data into concentrations.

REFERENCES:
patent: 3773424 (1973-11-01), Selgin
patent: 3861809 (1975-01-01), Hall, Jr.
patent: 3910701 (1975-10-01), Henderson et al.
patent: 4043668 (1977-08-01), Goetz et al.
patent: 4072424 (1978-02-01), McMullan
patent: 4432649 (1984-02-01), Krause
patent: 4673819 (1987-06-01), Rose
patent: 4708475 (1987-11-01), Watson
patent: 4804849 (1989-02-01), Booth et al.
patent: 4986665 (1991-01-01), Yamanishi et al.

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