Patent ID: 6142953
Filing Date: 2000-11-07
Classification: A61B

Abstract:
An inductive transducer comprising:an elastic material for attachment to an object,a first magnetic tape having a first wire winding thereon, the first magnetic tape attached to the elastic material,a second magnetic tape having a second wire winding thereon, the second magnetic tape attached to the elastic material, wherein the first wire winding and the second wire winding are proximate each other and electrically connected, such that the when the elastic material expands and contracts there is relative motion between the first and second wire windings,an insulation plate between the first magnetic tape and the second magnetic tape,a toroidal transformer connected to the first and second wire windings,a signal source for sending a carrier signal to the toroidal transformer, such that when the object expands or contracts the relative movement of the first and second wire windings produces a mutual inductance therein and modulates the carrier signals,a signal detector attached to the toroidal transformer for detecting the modulated signals therefrom such that the modulated signals measure the expansion and contraction of the object.