Constant-current light-sensing system

Details Constant-current light-sensing system Constant-current light-sensing system

1990-07-16

1991-10-08

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

307311, H01J 4014

Patent

active

050556690

ABSTRACT:
A constant-current light sensing system employs a constant-current diode in series with the power lead to a photoconductive cell. This diode provides a substantially fixed current through the cell and enables the system to be designed such that it can make maximum use of the linear portions of the cell's output response curve, and maximum use of the range of a potentiometer's settings. The cell used in conjunction with the system is received in a housing that is easily mountable to a wall or ceiling surface by an adhesive material.

REFERENCES:
patent: 3056332 (1962-10-01), Beregowitz
patent: 3421008 (1969-01-01), Shaw
patent: 3665224 (1972-05-01), Kelsey
patent: 4585339 (1986-08-01), Senoo
patent: 4758767 (1988-07-01), Blake
patent: 4841164 (1989-06-01), Basso
Horowitz, Paul and Winifield Hill, The Art of Electronics, Cambridge University Press, 1980, pp. 595-596, 231-232.

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