Optical fibre displacement sensor

Abstract

Abstract The displacement sensor has a doubly refracting optical fibre (2), in which two fixed coupling points (A and B) are provided. A mobile coupling point (M), created by a coupling device whose displacement is to be measured, is displaced along the fibre (2). A source (1) emits a linearly polarised wave (Py) along a neutral axis of the fibre. At each coupling point (A, B, M), a coupled wave train is created (PxA3, PxM3, PxB3). These coupled wave trains have a propagation speed lower than that of the primary wave train (PyB3). A detector makes it possible to locate the relative positions of the coupled wave trains and thus of the mobile coupling point (M) with respect to the fixed coupling points (A and B). …<??>Application to the measurement of displacements. …<IMAGE>…

Inventors

• 👤 Marc Turpin
• 👤 Michèle Brevignon
• 👤 Dominique Rojas

Bibliographic Details