Patent ID: 6137621
Filing Date: 2000-10-24
Classification: E21B,G01H

Abstract:
An acoustic logging system having a sonde for arranging in a borehole of a well, including an oil well, the sonde having at least one transmitter for providing at least one transmitter acoustic signal, and having receivers for responding to the at least one transmitter acoustic signal, for providing electrical receiver signals containing information about properties of earth formations in the borehole, the acoustic logging system comprising:one or more transducers arranged in the receiver of the sonde, responsive to the electrical receiver signals, for providing one or more mechanical transducer forces containing information about the electrical receiver signals;a light source for providing an optical signal;an optical fiber, responsive to the one or more mechanical transducer forces, for changing an optical parameter or characteristic of the optical signal depending on the change in length of the optical fiber in the sonde, and providing a transduced optical signal containing information about the one or more mechanical transducer forces from the one or more transducers; anda detection and management unit having a signal processor, responsive to the transduced optical signal, for providing a detection and management unit signal containing information about the properties of the earth formations in the borehole.