Method and apparatus for light transmission measurement by sendi

Details Method and apparatus for light transmission measurement by sendi Method and apparatus for light transmission measurement by sendi

1987-02-04

1988-12-27

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250227, 356437, G01N 1506, G01N 1507

Patent

active

047942665

ABSTRACT:
Measurement equipment based on the measurement of light transmission are plagued by changing characteristics of protective glass surfaces due to contamination or other factors. In a method, light transmission is measured by sending light from a transmitter (1) and recording the received light intensity at a receiver (2), after which the light intensity is obtained by computation means. Light from light sources (5, 6) travels into protective glasses (3, 4) of the transmitter and the receiver so that the light rays are subjected to total internal reflection within the glasses, after which the intensities of the totally reflected light rays are measured by a detector (7, 8), and the obtained intensity values are used for correcting the intensity attenuation, effected by the protective glasses and their contamination onto the path from the transmitter to the receiver. The apparatus comprises light sources (5, 6) integral with the transmitter (1) and the receiver (2), with the light rays from the light sources adapted to enter the protective glasses in such a manner as to be subjected to a total internal reflection, and detectors (7, 8) for intensity measurement of the totally reflected light rays.

REFERENCES:
patent: 3308709 (1967-03-01), Harrick
patent: 4040749 (1977-08-01), David et al.
patent: 4676638 (1987-06-01), Yasuda

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