Mitsubishi Denki Kabushiki Kaisha

Nippon Telegraph and Telephone Public Corporation

Japan Atomic Energy Research Institute

Hiroji Tanaka

Toshimasa Tomoda

Kishio Arita

Hideshi Yamagishi

Takashi Kozakai

Susumu Mitani

Yoshitaka Koide

Yoshio Habuka

Naoki Wakayama

Haruzi Sato

Yoshikazu Sudo

Hideo Sakai

In an ultrasonic inspecting apparatus, propagation time is measured between a transmitting point of an ultrasonic wave from outer circumference of a subject material and a receiving point of the ultrasonic wave at another point on the outer circumference spaced apart from the transmitting point by a predetermined angle, and a predetermined sequence of operations is performed with the measured propagation times and the known constants, thereby internal information concerning the material, including location and shape of a defect existing therein, is provided.

Ultrasonic inspecting apparatus

An ionization chamber comprises a plurality of cylindrical electrodes which are coaxially arranged, and a casing which holds the cylindrical electrodes in it under the condition allowing the axial shifting of the edges of the cylindrical electrodes but preventing the radial shifting of the cylindrical electrodes whereby the slight relative deviation of parts for the ionization chamber can be minimized during use at high temperature or during a severe thermal cycle.

Ionization chamber having coaxially arranged cylindrical electrodes

Growing community of inventors

Amagasaki, Japan

Hiroji Tanaka