Laser obstacle detection method and sensor

Details Laser obstacle detection method and sensor Laser obstacle detection method and sensor

1997-02-12

1999-10-19

Wachsman, Hal Dodge

Data processing: measuring, calibrating, or testing

Measurement system

Dimensional determination

702 40, 702150, 356 407, 359155, 25055913, 25055939, G01C 300

Patent

active

059704330

ABSTRACT:
A sensor detects the presence or the absence of an obstacle by radiating a laser beam to the outside of a casing through a light projecting mirror and by letting the reflected light from an obstacle enter a light receiving element through a light receiving mirror. A light projecting window with a light projecting mirror positioned and a light receiving window with a light receiving mirror are positioned in the casing with a space therebetween to prevent reflected light from directly entering the light projecting window. The mirrors are attached to a rotation shaft of a motor, or rotation shafts of motors, synchronously rotatable provided between both mirrors. The optical axis of light radiated to the outside of the casing is set to face in a higher direction than horizontal to radiate in a cone-shaped form. By comparing a received light signal from a light receiving circuit to an output signal from a circuit for a previously set threshold, which has a correlation between detected distance and light intensity, a light receiving trigger is output. The distance is calculated when a signal is greater than the threshold. The presence or the absence of an obstacle is determined by the detection of reflected light intensity. This laser obstacle detection method and sensor, which can be used on an automated guided vehicle (AGV), will not misdetect rainfall as an obstacle.

REFERENCES:
patent: 4998259 (1991-03-01), Chandra et al.
patent: 5455669 (1995-10-01), Wetteborn
patent: 5489149 (1996-02-01), Akasu
patent: 5572008 (1996-11-01), Sahai et al.
patent: 5604580 (1997-02-01), Uehara
patent: 5612781 (1997-03-01), Ohtomo et al.
patent: 5689328 (1997-11-01), Katayama
patent: 5745050 (1998-04-01), Nakagawa

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