公开(公告)号：US20230399036A1

公开(公告)日：2023-12-14

申请号：US18137593

申请日：2023-04-21

Applicant: Hitachi, Ltd.

Inventor： Ryuzo KAWABATA ,  Kuniomi OGATA

IPC: B61K9/08 ,  G01N27/82

CPC classification number: B61K9/08 ,  G01N27/82

Abstract: A rail state monitoring apparatus includes: a plurality of detection devices provided on a train that travels on left and right railroad rails forming a track, and a processing device. The train is composed of one or a plurality of vehicles. For each of the plurality of detection devices, the detection device has a magnetic sensor unit group that is one or more magnetic sensor units facing the railroad rail, the magnetic sensor unit detects a peculiar point when the magnetic sensor unit passes over the peculiar point on the railroad rail, and the detection device outputs a signal based on a result of the detection by the magnetic sensor unit group. The plurality of detection devices include detection devices provided symmetrically on right and left sides of the train and/or detection devices provided on front and rear sides of the train. The processing device receives signals output respectively from the plurality of detection devices, and discriminates whether the peculiar point is a rail seam point or a rail fracture point, based on a detection signal based on the signals from the plurality of detection devices.

公开(公告)号：US20210076978A1

公开(公告)日：2021-03-18

申请号：US16988176

申请日：2020-08-07

Applicant: HITACHI, LTD.

Inventor： Akihiko KANDORI ,  Ryuzo KAWABATA ,  Kuniomi OGATA ,  Takako MIZOGUCHI ,  Tsukasa FUNANE

IPC: A61B5/08 ,  A61B5/0408

Abstract: To perform respiratory monitoring and cardiac-output measurement on general patients, an aspect of a biological measurement apparatus includes: at least two electrodes that are attached to a living body; a power supply that causes an AC current to flow between the two electrodes; at least two coils that are placed so as to sandwich a line linking the two electrodes, and detect a magnetic field related to a change in the AC current accompanying a change in impedance of the living body; and a detection circuit that performs addition or subtraction of signals related to the magnetic field detected with the two coils, and outputs the signals as a change in the impedance.