Title:
SEBUM MEASURING INSTRUMENT
Document Type and Number:
Japanese Patent JPS55104741
Kind Code:
A
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.
Inventors:
JIAN RIYUKU RUBUEKU
JIRUBEERU GURA
JIRUBEERU GURA
Application Number:
JP1211980A
Publication Date:
August 11, 1980
Filing Date:
February 05, 1980
Export Citation:
Assignee:
OREAL
International Classes:
G01N21/27; G01N21/59; (IPC1-7): G01N21/59
Domestic Patent References:
| JPS4991490A | 1974-08-31 | |||
| JPS51136474A | 1976-11-25 |
Foreign References:
| FR236870A |
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