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:
Mar. 02, 2021
Filed:
Oct. 22, 2018
Aiq Dienstleistungen UG (Haftungsbeschränkt), Böblingen, DE;
Gregor Cedilnik, Gäufelden, DE;
AiQ Dienstleistungen UG (haftungsbeschränkt), Böblingen, DE;
Abstract
A distributed acoustic sensing (DAS) system has a coherent light source device that repeatedly sends a coherent interrogating light pattern (CILP) into an optical sensing fiber during a measurement duration that is equal to or greater than a down-up travel time of the optical sensing fiber. The CILP is one of a plurality of patterns composed of coherent carrier light. A detection device detects backscattered light in the optical sensing fiber in response to the CILP and generates a signal indicative of the detected backscattered light. An evaluation device analyses the signal. Each CILP has similar physical properties that render the light patterns indistinguishable by comparing physical properties of the backscattered light responsive to at least two successive interrogating light patterns as detected. The coherent light source device can change the time between successively sent interrogating light patterns after the passing of at least one measurement time duration.