An apparatus for measuring an internal dimension of a well-bore

摘要

An apparatus for measuring an internal dimension of a well-bore comprising a tool (101,201,401) adapted to be positioned inside the well-bore. The tool comprises an optical caliper comprising an optical sensor (112,212,312,402,404,412) providing a response correlated to the internal dimension of the well-bore, the optical sensor being coupled to an optical fiber (111,211,311A,311B,411).