Patent ID: 9109968
Filing Date: 2015-08-18
Classification: E21B,G01L

Abstract:
1. A strain sensor apparatus comprising, two or more strain sensors each of which is capable of measuring strain and each of which is configured such that it can be arranged to cooperate with an elongate tubular structure to be monitored along a length of the elongate tubular structure, so that strain in the elongate tubular structure can be detected by one or more of said strain sensors; one or more position references arranged to extend along the length of the elongate tubular structure along which the two or more strain sensors also extend, wherein the one or more position references are in a predetermined position relative to the two or more strain sensors along said length; and one or more measuring means which comprises a means for measuring angular orientation, wherein the one or more measuring means is configured to cooperate with the one or more position references so that an angular orientation of the one or more position references in a transverse plane through the tubular structure can be determined, wherein the one or more position references are each configured to cooperate with the one or more measuring means.