United States Patent
A logging tool having opposed paired transducers located on opposite sides of the borehole in both the source and the detector and vnethods for its use. One source transducer expands while the opposed transducer contracts and one detector transducer emits a positive electrical signal in response to inward pressure, while the other emits a negative electrical signal in response to inward pressure. The tool thus exploits flexural waves along a borehole and minimizes interference by the faster-traveling compressional waves.
Figures & Tables
Seismic Wave Propagation: Collected Works of J. E. White
This first chapter sets the stage for the later technical development of Dr. Whit’s career in applied seismics. Experiments, f’wst at the Acoustics Laboratory of the Massachusetts Institute of Technology and later at Mobil Oil and Marathon Oil, provided insight into the general problems of impedance measurements, transduction, filtering, and attenuation. These papers also serve as a bridge to show geophysicists how theft own experiments in seismology naturally interface with (indeed, arose out of) the larger world of sound measurements in air and water. These experiments demonstrate the power of geometrically constrained experiments to allow verification of approximate (and in some cases, exact) theories of sound.