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. 05, 1991
Filed:
Jul. 14, 1989
Applicant:
Inventor:
Kevin B McDonald, Bend, OR (US);
Assignee:
Tektronix, Inc., Beaverton, OR (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N / ; G01N / ;
U.S. Cl.
CPC ...
356 731 ;
Abstract
An automatic trigger mask for an optical time domain reflectometer inhibits high optical level pulses in a received optical signal from saturating an optical detector in a receiver. A portion of the received optical signal is compared with a threshold signal derived from the output of the receiver. If the portion of the received optical signal exceeds the threshold signal, then a control signal is generated to open an optical switch in the optical path to the receiver so that the high optical level pulses are inhibited from reaching the optical detector.