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. 10, 1976
Filed:
Jul. 11, 1974
Harvey Lee Kasdan, Van Nuys, CA (US);
Recognition Systems, Inc., Van Nuys, CA (US);
Abstract
Rather than counting nulls in the diffraction pattern generated by a very narrow line or gap in order to measure its width, the diffraction pattern is optically detected and converted to an analog electrical signal constituting a function of the detected intensities in the diffraction pattern. This function is then converted to a digital form, stored, and then passed to a computer electrically computing the Fourier transform to provide an autocorrelation wave form. This wave form is then plotted in an orthogonal X-Y coordinate system and the break point or extension of a linear segment of the autocorrelation curve relative to the X-axis used to provide a precise measurement of the given width.