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. 20, 1986
Filed:
May. 25, 1972
Raymond A Patten, Oxon Hill, MD (US);
Jerry A Blodgett, Annandale, VA (US);
The United States of America as represented by the Secretary of the Navy, Washington, DC (US);
Abstract
A method for measuring the separation between two spaced light-reflecting rfaces by means of a single laser pulse. The reflected light is divided into two beams which are then projected at the same angle .theta. onto the same area on a photographic film to form interference fringes. The film is developed, placed on a translating platform, and passed through the beam of a CW laser, a portion of the beam being diffracted by the interference fringes recorded on the film. The distance .chi. between the high-intensity points of adjacent interference regions is measured and the separation of the two light reflecting surfaces is calculated from the formula d=.chi. sin .theta..