Photoelectric compressed analog signal strength indicator

Details Photoelectric compressed analog signal strength indicator Photoelectric compressed analog signal strength indicator

1988-01-12

1989-07-25

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214L, H01J 4014

Patent

active

048516600

ABSTRACT:
A compressed analog signal strength indicator that produces a light signal proportional in intensity to the relative alignment of an associated photoelectric transmitter and photoelectric receiver pair is disclosed. A sensor (10) detects a light signal (18) received from the associated photoelectric transmitter and produces an electrical signal. A nonlinear circuit (12) compresses the electrical signal and supplies an output to a peak hold circuit (13), which controls the current flow to an indicator (14). A threshold detection loop, which includes: a demodulator (15); an integrator (16); and, a comparator (17), senses the amplified signal of sensor (10) and produces a noticeable step increase in the brightness of the indicator (14) when the light signal (18) is first detected by the sensor (10).

REFERENCES:
patent: 3892493 (1975-07-01), Pallingen et al.
patent: 3895876 (1975-07-01), Mori
patent: 3914701 (1975-10-01), Burdick
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patent: 4096382 (1978-06-01), Numata et al.
patent: 4178512 (1979-12-01), Frungel et al.
patent: 4356393 (1982-10-01), Fayfield
patent: 4528501 (1985-07-01), Dorrough et al.
patent: 4648135 (1987-03-01), Labrum et al.
patent: 4674870 (1987-06-01), Cain et al.

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