Hitachi, Ltd.

Hitachi Engineering Services Co., Ltd.

Hitachi-Ge Nuclear Energy, Ltd.

Mitsubishi Hitachi Power Systems, Ltd.

Kojirou Kodaira

Mitsuru Odakura

Kazuhiro Suzuki

Yutaka Suzuki

Tetsuya Matsui

Satoshi Okada

Masahiro Koike

Kenji Kumasaka

Katsumi Isaka

Kenji Tayama

Yuuji Adachi

Noriyuki Sadaoka

Yasushi Nagumo

Hiroshi Kamimura

Ryosuke Kobayashi

Masahiro Tooma

Yosuke Takatori

Yutaka Kometani

Jun Nukaga

Satoshi Takemori

The position detection system includes a pressure sensor that detects the vertical position of an underwater vehicle, a range sensor unit that detects the relative distances of the underwater vehicle from its surrounding structures; a measurement image acquisition unit that acquires a measurement image of the horizontal plane, an image storage unit that stores images, an image selector that selects one of the stored images that corresponds to the horizontal plane in which the relative distances have been detected, a corresponding-area identification unit that identifies the area in the selected image that corresponds to the measurement image by performing map matching, and a horizontal position calculator that identifies, the pixel that corresponds to the position at which the relative distances have been detected and calculates the horizontal position of the underwater vehicle.

System and method for detecting position of underwater vehicle

The pipe inspection method and apparatus can be used to implement rapid, tomographic inspection of a pipe set up at a narrow location. The pipe inspection method includes: a first step for scanning the pipe by translating a radiation source and radiation detector arranged opposedly to the pipe; a second step for the radiation detector to detect radiation that the radiation source has emitted, at given scanning distance intervals; a third step for creating a transmission image of the pipe, based on a radiation dose that the radiation detector has detected; and a fourth step for constructing a tomogram or stereoscopic image of the pipe, based on the transmission image. Thus, it is possible to provide the pipe inspection method and apparatus that can be used to implement rapid, tomographic inspection of the pipe set up at a narrow location.

Method for inspecting pipes, and radiographic non-destructive inspection apparatus

An eddy current testing method for a turbine rotor including a disc, a plurality of turbine blades disposed along the periphery of the disc, and a plurality of pins for joining a blade fork portion formed on each of the plurality of turbine blades to a disc fork portion formed on the disc, the method including inserting a probe having an eddy current testing sensor into a hole formed through the disc fork portion and the blade fork portion by pulling out one of the plurality of pins in a state that the blade fork portion is still inserted into the disc fork portion; and performing eddy current testing for at least part of an internal surface of the hole by using the probe.

Eddy current testing apparatus and eddy current testing method

An ultrasonic testing apparatus for a turbine fork of a turbine blade joined to a turbine disc, comprising:

Ultrasonic testing apparatus for turbine forks and method thereof

The eddy current testing apparatus includes a probe having an eddy current testing sensor including a pair of eddy current testing coils. The apparatus also includes an eddy current testing flaw detector inputting detection signals from the eddy current testing sensor. The diameter of a magnetic core used in each of the pair of eddy current testing coils is within the range of 0.1 mm to 0.5 mm.

Eddy current testing method

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Hitachinaka, Japan

Kojirou Kodaira