Patent ID: 7735373

Claim:
An apparatus for measuring pressure inside a vessel using a magnetostrictive acoustic transducer employing ultrasonic waves, the apparatus comprising: a magnetostrictive exciting/receiving transducer comprising an exciting coil unit wound on a first magnetization yoke disposed on an outer position of a vessel, a receiving coil unit wound on the first magnetization yoke, and a vibration unit disposed on an inner position of the vessel in which the first magnetization yoke is installed; a control unit for supplying a predetermined excitation current signal to the exciting coil unit; and a pressure measuring unit for measuring an internal pressure of the vessel based on an ultrasonic wave signal received by the receiving coil unit and an excitation current signal into the exciting coil unit, wherein the control unit supplies a predetermined excitation current signal to the magnetostrictive exciting/receiving transducer such that a resonance of the ultrasonic waves is induced between the vibration unit and the inner face of the vessel wall.