An apparatus for sensing strain applied to a region of a hydrocarbon well comprises an optical fiber in communication with the region. The optical fiber is responsive to strain applied to the region and to a light signal transmitted through it, in order to produce a sensing light signal incorporating scattered light. A characteristic of the scattered light is indicative of the strain being applied to the region.
https://app.acclaimip.com/pdf/MeK2RR9j_2WY4rYg-mP_afMTPZKLoQK0OLeubjA/US6555807B2
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