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:
Feb. 14, 1989
Filed:
Sep. 23, 1987
John M Miller, Huntington Station, NY (US);
Richard O Barton, Levittown, NY (US);
Michael T Bergin, Bayside, NY (US);
Grumman Aerospace Corporation, Bethpage, NY (US);
Abstract
Apparatus for measuring the displacement of a member relative to a reference plane has a transmitter and a receiver spaced therefrom at a predetermined distance. A reference energy beam coaxially passes through a light diffraction grating having a ruled surface. The grating passes a zero order part of the beam through undeviated and diffracts a multiplicity of beams of first, second, third, and higher order, at constant angles with the zero order part, the angles varying with the frequency of the ruled surface of the grating. A coaxial sleeve movably mounts the light diffraction grating to provide a roll zero reference. The zero order part of the beam provides the zero reference for pitch and yaw and the first order beams provides zero reference for roll. The lines of the ruled surface of the grating have a frequency matching the predetermined distance. The receiver has a container movably mounted to provide a roll zero reference, a pitch and yaw displacement indicator in the container and a roll indicator in the container.