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. 02, 1999
Filed:
May. 28, 1998
Applicant:
Inventor:
Tohru Mori, Tokyo, JP;
Assignee:
Ando Electric Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
356 731 ; 385100 ;
Abstract
A distance correction method and the controller for a reflectometer is disclosed which is able to perform accurate correction of the distances measured by reflectometer. In the distance correction method for the reflectometer which measures the Fresnel reflection or Raleigh back-scattering light of an optical fiber or an optical waveguide, the distance correction D.sub.wg1 -D.sub.wgn is performed according to the respective group refraction ratios which are the parameters of the optical fiber or the optical waveguides longitudinally connected with having different known group refraction ratios.