Constant-current light-sensing system and improved sensor housin

Details Constant-current light-sensing system and improved sensor housin Constant-current light-sensing system and improved sensor housin

1990-06-15

1991-08-13

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Housings

200294, H01J 502

Patent

active

050398539

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: 3584228 (1971-06-01), Kenyon et al.
patent: 4293752 (1981-10-01), Koenig
patent: 4568826 (1986-02-01), Pitel et al.
patent: 4791290 (1988-12-01), Noone et al.

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