Apparatus to register the quantity of sebum secreted by a skin

Details Apparatus to register the quantity of sebum secreted by a skin Apparatus to register the quantity of sebum secreted by a skin

1979-04-06

1984-11-06

Rosenberger, R. A.

Optics: measuring and testing

For light transmission or absorption

By comparison

G01J 345

Patent

active

044809212

ABSTRACT:
Method and apparatus to measure the quantity of sebum secreted by the skin, by passing light through the specimen. The light passed through the specimen is modulated at a predetermined frequency, and only light of the same modulated frequency is measured by a receiver. The apparatus includes automatic zero calibration, and several embodiments of stabilized phototransistor circuits.

REFERENCES:
patent: 3013467 (1961-12-01), Minsky
patent: 3711210 (1973-01-01), Krukowski
patent: 3817632 (1974-06-01), Picunko et al.
patent: 3887281 (1975-06-01), Kurita et al.
patent: 3927317 (1975-12-01), Liedholz
patent: 4027981 (1977-06-01), Steinbatz
patent: 4035087 (1977-07-01), Mori et al.

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