Protection from extraneous light for light guided vehicle

Details Protection from extraneous light for light guided vehicle Protection from extraneous light for light guided vehicle

1988-03-07

1989-10-24

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250561, 180169, H01J 4014

Patent

active

048764442

ABSTRACT:
An automated guided vehicle uses a scanning laser unit having a laser transmitter and receiver to transmit laser signals and receive them reflected back from a series of targets. The reflected signals are used to guide the vehicle along a desired path. The laser unit includes a photodetector mounted near the laser receiver such that any extraneous light, such as sunlight, that strikes the laser receiver will also strike the photodetector. The photodetector converts the extraneous light into an electrical signal proportional to the amount of such light. The photodetector signal is compared to a threshold value which generally is slightly below an amount of extraneous light sufficient to confuse the laser unit. If the threshold value is exceeded, the photodetector signal is used to stop the vehicle or take other appropriate action.

REFERENCES:
patent: 3529214 (1970-09-01), Corn
patent: 3665224 (1972-05-01), Kelsey
patent: 4629941 (1986-12-01), Ellis et al.
patent: 4645975 (1987-02-01), Meitzler et al.

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