Electroacoustic transducer apparatus

Claim 1

AN ELECTROACOUSTIC TRANSDUCER APPARATUS FOR DEVELOPING IMPULSE OF ACOUSTIC ENERGY IN EARTH FORMATIONS IN THE VICINITY OF A BORE CONTAINING FLUID, COMPRISING ELONGATED ACOUSTIC TRANSDUCER MEANS FOR PRODUCING AND PROPAGATING ACOUSTIC IMPULSES LONGITUDINALLY OF THE BORE, ELECTRICAL DELAY CIRCUIT MEANS INCLUDING INDUCTANCE AND CAPACITANCE COUPLED TO SAID TRANSDUCER MEANS TO INCORPORATE SAID TRANSDUCER MEANS INTO SAID DELAY CIRCUIT, WHEREBY THE CHARACTERISTICS OF THE LATTER ARE DEPENDENT IN PART UPON THE TRANSDUCER MEANS, MEANS FOR APPLYING A PULSE OF ELECTRICAL ENERGY TO SAID DELAY CIRCUIT TO DEVELOP A TRAVELING ACOUSTIC PULSE IN SAID ACOUSTIC TRANSDUCER MEANS AND DIRECTED LONGITUDINALLY OF THE BORE, SAID ACOUSTIC PULSE BEING CONTINUALLY REINFORCED IN MAGNITUDE BY SAID TRAVELING ELECTRICAL PULSE, AND MEANS ACOUSTICALLY COUPLED TO ONE END OF SAID ACOUSTIC TRANSDUCER MEANS FOR COUPLING SAID ACOUSTIC PULSE WITH THE FLUID IN THE BORE, SAID COULING MEANS DEFINING A TRANSMISSION PATH FOR CHANGING THE DIRECTION OF PROPAGATION OF SAID ACOUSTIC PULSE.