| 摘要 |
A method and apparatus for measuring the relative movement of one end of a cylindrical member relative to the other end employs first and second strain-sensitive, parametric elements, such as optical fibers. The elements are connected to the cylindrical member being monitored along substantially the entire length of the member. An interrogation signal source applies an interrogation source signal to at least an interrogation end of each of the optical fibers and a detector or sensor measures a source signal parameter which is differentially affected by strain created due to selected movement at the one end of the cylindrical member. Circuitry is provided for determining, from its effect upon the signal source, the amount and direction of movement of the end of the cylindrical member relative to a reference standard. In particular, interfermetric measurement criteria are employed for determining the relative movement of the ends of the cylindrical member.
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