Optoelectric transducer

Details Optoelectric transducer Optoelectric transducer

1986-03-14

1987-12-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

330 59, 330308, 330 11, H01J 4014

Patent

active

047148284

ABSTRACT:
An optoelectronic transducer is proposed which includes a PIN diode (2) that delivers a current that is proportional to a light signal that is received. The diode is connected to the input of an inverting amplifier (4) that delivers a voltage signal v.sub.s. A negative feedback means of the transfer impedance type (6) is connected across the inverting amplifier. The transducer further includes a stabilizing means (8) for the amplifier gain and a temperature drift compensating means (10) for compensating for the drift in amplifier temperature. The stabilizing means (8) includes a detector (26, 28, 32) for the high peak of the signal v.sub.s, and the temperature drift compensating means (10) includes a filter means (38) for producing the means value v.sub.m of the signal v.sub.s, and a comparator (40) that receives the signals v.sub.s and v.sub.m and delivers a signal that reproduces the interference of the light signal that has been received. The temperature drift compensating (10) also includes a carrier wavedetection (cs) with automatic control (42). This automatic control enables very high speed detection of the carrier wave not only at a high level, but at a low level as well.

REFERENCES:
patent: 4363977 (1982-12-01), Tsuda
patent: 4429218 (1984-01-01), Thomas

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