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:
Apr. 11, 2000
Filed:
Aug. 15, 1997
Kam C Lau, Gaithersburg, MD (US);
Yuan-Qen Liu, Greenbelt, MD (US);
Cam C. Lau, Gaithersburg, MD (US);
Abstract
A 6-axis laser measurement system includes a novel 5-D measurement apparatus and a precision laser roll detector. The 5-D system measures pitch, yaw, X, Y, and Z displacements with a single setup of a laser head and detection housing. The laser roll detector uses a polarizing prism, such as a Glan-Thompson prism, and at least two photodetectors. A linearly polarized laser beam enters the prism, and the beam is split into two polarized components, the intensities of which vary with roll orientation of the detector relative to the polarized laser beam. The outputs of the two photodetectors are connected to the positive and negative inputs, respectively, of a high gain differential amplifier which provides a roll output.