Laser beam delivery path and target proximity sensor

Details Laser beam delivery path and target proximity sensor Laser beam delivery path and target proximity sensor

1993-11-15

1995-01-17

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

606 12, 250561, G01J 132

Patent

active

053827856

ABSTRACT:
A laser diode operating system utilizes the photodiode mounted in the housing of the laser diode, and monitors the photodiode signal to check for a clear laser beam delivery path and a target proximate to the output of the beam path. Upon initial power-up of the system, a brief laser pulse is emitted, and laser light reflected retrograde in the delivery path is received by the photodiode. If the photodiode signal exceeds a first threshold level, due to occlusion of the delivery path, further operation of the system is prevented until the delivery path is cleared. During operator use, the photodiode signal is compared with a second threshold level, and operation is interrupted if the signal fails to exceed the second threshold level. During interruption of operation mode, the laser diode is pulsed briefly and reiteratively to ascertain if a target object is proximate to the laser diode output. If the reflected light level indicates that a target object is proximate, the system will restore continuous operating mode while continuing to monitor the photodiode current.

REFERENCES:
patent: 4692924 (1987-09-01), Koizumi et al.
patent: 5200604 (1993-04-01), Rudko et al.
patent: 5285058 (1994-02-01), Goodwin

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