National Institute of Advanced Industrial Science and Technology

Yazaki Corporation

Nobuhisa Kaneko

Yoshitaka Ito

Atsushi Yamamoto

Takaya Kondo

Yasutaka Amagai

Jun Toyoizumi

Hiroyuki Fujiki

Yasuhiro Fukuyama

Megumi Akoshima

A deterioration degree diagnosis device includes a measurement unit and a diagnosis unit. The measurement unit measures an impedance related to a contact resistance of an electrical connection portion by measuring an AC voltage between metal members and an AC current flowing between the metal members in a state where an AC signal of a predetermined frequency is applied to an electric circuit that connects two metal members in contact via the electrical connection portion. The diagnosis unit diagnoses a deterioration degree of the electrical connection portion based on a reactance component value in the impedance measured by the measurement unit.

Deterioration degree diagnosis device and deterioration degree diagnosis method for electrical connection portion

Thermophysical property measurement apparatus and method that can obtain accurate absolute thermoelectric power and thermal conductivity are provided easily and conveniently. A thermophysical property measurement apparatusis provided which includes a DC-AC voltage generatorwhich selectively applies AC or DC voltages of different polarities to a metal sampleto which temperature gradient is provided by connecting the metal samplebetween metal blocks of temperatures Tand T; a thermocouplewhich measures a temperature change at the center of the metal samplewhen the AC voltage is applied thereto by the DC-AC voltage generatorand a temperature change at the center of the metal samplewhen the DC voltages of the different polarities are applied; and an operation devicewhich calculates absolute thermoelectric power and thermal conductivity of the metal sampleusing the two temperature changes measured by the thermocouple

Thermophysical property measurement method and thermophysical property measurement apparatus

Growing community of inventors

Tsukuba, Japan

Nobuhisa Kaneko