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, 1991
Filed:
Mar. 27, 1990
Applicant:
Inventor:
Zhuo-Jun Lu, Pierrefonds, CA;
Assignee:
Canadian Marconi Co., Montreal, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01B / ;
U.S. Cl.
CPC ...
356349 ; 356345 ; 356358 ;
Abstract
The interferometer is fed by a laser whose wavelength is modulated. The frequency of the optical fringes generated by modulating the wavelength of the laser are measured. Preferably, the measurement of the frequency is carried out by counting pulses. A system for carrying out the method includes a pulse counter circuit.