Ratiometric transparency meter

Details Ratiometric transparency meter Ratiometric transparency meter

1977-02-17

1978-06-13

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250575, 356206, G01J 132

Patent

active

040950980

ABSTRACT:
In the control and measurement of opacity, turbidity, thickness and other factors affecting the transmission of light a ratiometric method and apparatus for measuring the transparency of a specimen by comparison to a reference specimen, wherein electronic technology is used for controlling the intensity of one light source in relation to another without using any mechanically moving parts. The invention can be applied to the regulation of any two voltage controlled energy sources used in the ratiometric measurement of physical or chemical parameters.

REFERENCES:
patent: 3629589 (1970-03-01), Gleixner et al.
patent: 3652850 (1972-03-01), Briggs
patent: 3698820 (1972-10-01), Hanff et al.

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