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:
Nov. 19, 1985
Filed:
Feb. 08, 1983
Gianni Coppa, Asti, IT;
Giorgio Grego, Turin, IT;
Abstract
A body transparent to laser radiation, such as an optical fiber or a preform thereof in the process of manufacture, is transluminated by a monochromatic beam of a frequency in the THz range split off from a composite laser beam with two closely spaced frequencies produced by the Zeeman effect. Another monochromatic beam of the second laser frequency bypasses the transparent body and is photoelectrically recombined with the first beam to provide an electrical measuring wave at a beat frequency in the MHz range differing in phase from an electrical reference wave of the same beat frequency, similarly derived from the original laser beam, to an extent determined by the refractive index and the thickness of the transluminated body. Two or more phase comparisons are made with different angles of incidence of the transluminating beam and their results are compared for an arithmetic determination of refractive index and thickness.