Linear analog light-level monitoring system having short leads t

Details Linear analog light-level monitoring system having short leads t Linear analog light-level monitoring system having short leads t

1988-04-22

1990-04-24

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

315158, H01J 4014

Patent

active

RE0332054

ABSTRACT:
A system for monitoring the level of light at a distant location from a central location. A light sensor at the location to be monitored is comprised essentially of a photodiode and an operational amplifier and produces a high-level, analog output signal on an output signal line, the signal being linearly proportional to the level of light at the location. A control unit at a central location is electrically coupled to the sensor and comprises a power supply for providing electrical power to the sensor and a calibration device connected to the output signal line for providing a feedback signal to the sensor. The calibration device may be adjusted so that the output signal at the control unit bears a selected ratio to the light detected. A control unit having a single and power supply may be coupled to a plurality of sensors.

REFERENCES:
patent: 4009387 (1977-02-01), Nuver
patent: 4236101 (1980-11-01), Luchao
patent: 4349863 (1982-09-01), Petersen
Energy Saver for Industrial Lighting, Arline et al., NASA Tech. Briefs, Fall, 1979, p. 407.
Linear Applications Handbook: National Semiconductor; National Semiconductor Corporation, Santa Clara, Calif., 1980; pp. AN211-1 through AN211-14 (See inventor's declaration for re-issue application, paragraph 10, pp. 6-7.).
Widlar, Robert J., "Working with High Impedance Op Amps," National Semiconductor Application Note 241, pp. 580-585.
"IC Op Amp Beats FETs on Input Current," EEE, Dec. 1969; pp. AN29-1 to AN29-20.
Stout, David, Handbook of Operational Amplifiers Circuit Design; 1976, McGraw-Hill Book Company, pp. 3-18 to 3-27 and Appendix III.

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