Method and apparatus for determining the position and diameter o

Details Method and apparatus for determining the position and diameter o Method and apparatus for determining the position and diameter o

1990-10-04

1992-06-02

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

2502061, 2502086, 21912178, G01J 120

Patent

active

051189224

ABSTRACT:
The present invention is a process and apparatus for determining the position and diameter of the focal point of a laser beam, specifically for use in material processing with a heavy-duty laser beam. In a process for determining the position and diameter of the focal point of a laser beam, specifically a heavy-duty laser beam, a rotationally symmetric reflector which reproduces a laser beam on a focal line is introduced in the path of rays of a focused laser beam. Reflected on the reflector, the laser beam is captured by way of at least one sensor which is fixedly coordinated with the reflector in the focal line, while the focal plane, the lateral position of the focal point and the diameter of the focal point are then determined by way of measured values captured in the sensor, with the sensor being shifted relative to the focusing optics of the laser beam or relative to the reflector. The output intensity of the laser is reduced to a point where the laser can be safely and unequivocally measured with the aid of sensors.

REFERENCES:
patent: 3423593 (1969-01-01), Chinnock
patent: 3956636 (1976-05-01), Williams
patent: 4711998 (1987-12-01), Malek
patent: 4836669 (1989-06-01), Teach
patent: 4847479 (1989-07-01), Clark et al.
patent: 4893025 (1990-01-01), Lee
patent: 5008510 (1991-04-01), Koseki

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