The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 28, 1996
Filed:
Sep. 07, 1994
Gregory D Cray, Chanhassen, MN (US);
Terry L VanderWert, Inver Grove Heights, MN (US);
Lumonics Corporation, Eden Prairie, MN (US);
Abstract
A laser beam measurement device comprises a pinhole aperture spaced to one side of a power meter for measuring the power level of the laser beam. The positioning system of the laser system causes the laser beam to move relative to the pinhole aperture in each of the three x, y and z directions of an xyz coordinate system, namely longitudinally, transversely and radially relative to the pinhole aperture, respectively. During each scan, the power meter measures the Gaussian distribution of the power level that occurs when the laser beam passes through the pinhole aperture and moves relative thereto along the scan axis. The coordinate position of the laser beam along each scan axis is identified corresponding to a peak value of the Gaussian distribution, thus deriving a three dimensional reference location corresponding to the point in space at which the focal point of the laser beam is centered on the pinhole aperture.