Transducer drive and underwater detector system

Abstract

Abstract A NOVEL SYSTEM IS DESCRIBED FOR DRIVING A REACTIVE TRANSDUCER SUCH AS CRYSTAL IN A MANNER WHICH UTILIZES THE FULL CAPABILITY OF THE TRANSDUCER AND ALSO IMPROVES THE OPERATION OF THE SYSTEM RESPONDING TO OUTPUT SIGNALS FROM THE TRANSDUCER. AN OSCILLATOR OPERATING AT THE RESONANT FREQUENCY OF THE TRANSDUCER PROVIDES DRIVING ENERGY VIA A DRIVING CIRCUIT HAVING ESSENTIALLY NONREACTIVE CHARACTERISTICS AT THE OPERATING FREQUENCY, THE DRIVE CIRCUIT BEING DIRECTLY COUPLED TO THE TRANSDUCER FOR PROVIDING COHERENT PULSES OF OPERATING ENERGY THERETO AT THE RESONANT FREQUENCY OF THE TRANSDUCER. IN ONE EXAMPLE A PUSH-PULL TRANSISTOR OUTPUT STAGE IS DISCLOSED AS ISOLATING THE FREQUENCY DETERMINING COMPONENTS OF THE OSCILLATOR FROM THE TRANSDUCER. AN EXTREMELY LOW IMPEDANCE OUTPUT STAGE IS THUS UTILIZED AND SERVES TO DRIVE THE TRANSDUCER EXACTLY AS ITS INHERENT RESONANT FREQUENCY. THE IMPROVED TRANSDUCER DRIVE SYSTEM AND METHOD IS DISCLOSED AS AN IMPORTANT PART OF AN IMPROVED UNDERWATER DETECTION SYSTEM WHEREIN THE RETURN ECHO PICKED UP BY THE TRANSDUCER IS AMPLIFIED BY A HIGH Q, NARROW BAND RECEIVER WHICH IS SIMILARLY TUNED TO THE RESONANT FREQUENCY OF THE TRANSDUCER. CIRCUIT DIAGRAMS AS WELL AS SYSTEM BLOCK DIAGRAMS ARE PROVIDED.

Inventors

• 👤 Bruce H Bettcher

Bibliographic Details