Infinite level setting device for a distance measuring device

Details Infinite level setting device for a distance measuring device Infinite level setting device for a distance measuring device

1987-07-09

1988-09-27

Adams, Russell E.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 4, 354403, G01C 300, G03B 300

Patent

active

047737514

ABSTRACT:
A distance measuring device for measuring a distance to an object has an LED for projecting a pulse light to the object, photoelectric cells for receiving a reflected pulse light from the object in addition to an ambient light and producing a pulse signal representing the reflected pulse light and a noise signal representing the ambient light, a circuit for generating a level signal which increases as the ambient light becomes brighter, thereby locating the noise signal below the level signal, a comparator for comparing the level signal with the reflected light signal and producing, when the reflected light signal is below the level signal, an infinite signal indicating that the object is located at an infinite distance.

REFERENCES:
patent: 4429967 (1984-02-01), Tokuda et al.
patent: 4502724 (1985-03-01), Suzuki et al.
patent: 4529304 (1985-07-01), Ogawa et al.

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