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:
Jul. 02, 1991
Filed:
Sep. 14, 1990
John N Lee, Silver Spring, MD (US);
Ray B Brown, Jr, Upper Marlboro, MD (US);
The United States of America as represented by the Secretary of the Navy, Washington, DC (US);
Abstract
A common-path interferometric acoustic-optic heterodyne spectrum analyzer ving high immunity to ambient vibration uses two, counter-propagating beams, two Bragg cells for beam diffraction, a series of waveplates and a birefringent quartz wedge. Proper light polarization with the waveplates and Bragg cell geometry allows one Bragg cell to diffract primarily the clockwise beam and the other Bragg cell to diffract the counterclockwise beam. The birefringent quartz wedge shifts the diffracted beams to provide a heterodyne signal with a non-zero IF carrier frequency. The analyzer is highly angle compensated and alignment stable when components are disturbed in position or orientation.