Method and apparatus for measuring the frequency of radiation

Details Method and apparatus for measuring the frequency of radiation Method and apparatus for measuring the frequency of radiation

1979-11-19

1981-12-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356402, 356416, G01J 350

Patent

active

043084567

ABSTRACT:
A method and apparatus for measuring the frequency of radiation is described comprising a pair of filters (2,3) or a beam splitter (30) responsive to radiation from a source of radiation (4) for providing a first output having a magnitude which increases and a second output having a magnitude which decreases with an increase in the frequency of said radiation, a divider (11) for providing a ratio of the magnitudes of said first and second outputs and a comparator (14) and memory (17) responsive to the ratio from said divider (11) for providing an output corresponding to the frequency of said radiation.

REFERENCES:
patent: 4057146 (1977-11-01), Castaneda et al.
patent: 4057352 (1977-11-01), Babb

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