Device for detecting objects, particularly such in motion

Details Device for detecting objects, particularly such in motion Device for detecting objects, particularly such in motion

1986-02-18

1987-12-15

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250221, 250341, 49 25, G01J 144

Patent

active

047135450

ABSTRACT:
The invention comprises a pulse transmitter (2,3) for infrared light, the reflected radiation from which is received by photo-diodes (5) converting the light pulses to electric pulses (FIG. 3), which are amplified (9) and applied to a balancing circuit (12), which operates digitally and with a given working or threshold level. Applied pulses give the output of the balancing circuit (12) a low state, which is supplied to a first integration circuit (16) having relatively rapid integration time, and which is in series with a second integration circuit (18). The integration circuits each control an input (21,26) of a comparison circuit (22), which generates an operation signal on its output (27,28) when there is a difference in integration conditions, the slower integration circuit (18) controlling the working or threshold level of the balancing circuit (12).

REFERENCES:
patent: 4068222 (1978-01-01), Treviranus
patent: 4541080 (1985-09-01), Kodaira

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