Reflective optical instrument for measuring surface reflectance

Details Reflective optical instrument for measuring surface reflectance Reflective optical instrument for measuring surface reflectance

1991-03-20

1992-04-07

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356448, G01N 2186

Patent

active

051031060

ABSTRACT:
An optical instrument for measuring characteristics of a specimen comprising a light source to project a beam onto the surface of a specimen at a selected oblique angle of incidence .beta.. The instrument also contains a photosensor to receive the beam reflected from the specimen at the same angle .beta.. A conductor connected to the photosensor is provided for carrying current to signal conditioning hardware used to compare the current from two or more photosensors or, if present, from different segments of the same photosensor to provide information concerning the specimen. Photosensor means is also positioned facing the specimen on an optical axis located normal to the surface of the specimen and intermediate the incident and reflected beams from the light source to receive a beam reflected from the specimen normal to its surface, i.e., along the optical axis. Signals from the photosensors are fed to the signal conditioning hardware to measure the optical power and to compare signals for measuring characteristics of the surface, e.g., its reflectivity or reflectance and to locate its position and/or orientation with respect to the instrument.

REFERENCES:
patent: 3858983 (1975-01-01), Foster et al.
patent: 4072425 (1978-02-01), Guttman
patent: 4358202 (1982-11-01), Puffer et al.
patent: 4673818 (1987-01-01), Guerra
patent: 4737650 (1988-04-01), West
patent: 4929846 (1990-05-01), Mansour
patent: 4933567 (1990-06-01), Silva

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