| 摘要 |
PROBLEM TO BE SOLVED: To prevent cracking and breakage of a ceramic ultrathin ultrasonic oscillator attached to the rear of an ultrasonic propagation short substance, and to measure the accurate melted length of a sidewall. SOLUTION: In an immersion type ultrasonic unit for measuring the thickness of the inner wall of a low melting point molten metal bath, an ultrasonic probe of a long body wherein an ultrasonic oscillator is joined with an adhesive made from resin is arranged on an axis in the direction of an inner-wall thickness measurement, and a water cooling chamber to be connected to cooling water supply/outlet pipes, and surround the ultrasonic oscillator and the rear of a long object for second or higher order reflection propagation of ultrasonic waves is formed, and a holder is provided for holding the long object for second or higher order reflection propagation of ultrasonic waves. Inside or outside the unit, an inclination detector is arranged for detecting the inclination of the axial center of the ultrasonic probe. COPYRIGHT: (C)2005,JPO&NCIPI
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