Null balance radiometric apparatus

Details Null balance radiometric apparatus Null balance radiometric apparatus

1974-12-06

1976-01-13

Stolwein, Walter

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250205, 250578, 356152, 307311, G01J 120

Patent

active

039327442

ABSTRACT:
In the radiometric apparatus disclosed herein, radiant energy from a target is chopped before reaching a detector element. The same detector element receives radiation from a light-emitting diode which is periodically energized in synchronism with the chopping, the level of the energization of the light-emitting diode being varied as a function of a feedback signal obtained by synchronously demodulating the detector signal. In this manner, the a.c. component of the detector signal is driven to a null balance, the level of energization of the light-emitting diode at balance being indicative of the level of radiation received from the target.

REFERENCES:
patent: 3354773 (1967-11-01), Shreve
patent: 3638025 (1972-01-01), Dishington et al.
patent: 3711210 (1973-01-01), Krukowski
patent: 3723744 (1973-03-01), Lim et al.
patent: 3772514 (1973-11-01), Sunderland

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