公开(公告)号：US20210063255A1

公开(公告)日：2021-03-04

申请号：US17008838

申请日：2020-09-01

Applicant: Hitachi, Ltd.

Inventor： Masanori KITAOKA ,  Hisashi ENDO ,  Hiroshi YOSHIKAWA ,  Toshihiro YAMADA ,  Nobuhiro KAKENO

IPC: G01L1/12 ,  G01R33/032 ,  G01L1/22

Abstract: A stress distribution measurement device includes: a first magnetostrictive sensor and a second magnetostrictive sensor each including an excitation coil that excites AC magnetism in a measurement target using alternating current, and a detection coil to which alternating current is induced due to the AC magnetism flowing in the measurement target; an excitation circuit that applies a first excitation voltage to the excitation coil of the first magnetostrictive sensor and applies a second excitation voltage to the excitation coil of the second magnetostrictive sensor, the second excitation voltage having a phase or a waveform different from the first excitation voltage; and a detection circuit that includes a first detector that performs synchronous detection of current flowing in the detection coil of the first magnetostrictive sensor based on the first excitation voltage and a second detector that performs synchronous detection of current flowing in the detection coil of the second magnetostrictive sensor based on the second excitation voltage.

公开(公告)号：US20150331051A1

公开(公告)日：2015-11-19

申请号：US14707245

申请日：2015-05-08

Applicant: Hitachi, Ltd.

Inventor： Kohji MAKI ,  Shinya YUDA ,  Hiroaki KOJIMA ,  Satoshi KIKUCHI ,  Hisashi ENDO

IPC: G01R31/34 ,  G01M13/04 ,  G01R31/12

CPC classification number: G01R31/343 ,  G01M13/04 ,  G01R31/025 ,  G01R31/12 ,  G01R31/34

Abstract: Provided is a deterioration diagnosis system which diagnoses deterioration of an N-phase rotational machine (N denotes a natural number). The deterioration diagnosis system includes a first current sensor to be attached individually to at least lead wires of (N-1)-phases in a rotational machine, the first current sensor being able to detect a current amplitude arising from a plurality of deterioration causes, and a second current sensor to be attached collectively to the lead wires of all phases in the rotational machine, the second current sensor being able to detect a current amplitude arising from a plurality of deterioration causes.

Abstract translation: 提供了诊断N相旋转机器的劣化的劣化诊断系统（N表示自然数）。 劣化诊断系统包括：第一电流传感器，其分别连接到旋转机器中的（N-1）相的至少导线上，第一电流传感器能够检测由多个劣化原因引起的电流幅度， 以及第二电流传感器，其集体地附接到旋转机器中的所有相的引线，第二电流传感器能够检测由多个劣化原因引起的电流幅度。

公开(公告)号：US20140225606A1

公开(公告)日：2014-08-14

申请号：US14177965

申请日：2014-02-11

Applicant: Hitachi, Ltd.

Inventor： Hisashi ENDO ,  Soshi NARISHIGE ,  Mitsuteru INOUE ,  Hiroyuki TAKAGI

IPC: G01N27/82 ,  G01N27/72

CPC classification number: G01N27/82 ,  G01N21/21 ,  G01N21/8806 ,  G01N27/72 ,  G01R33/032 ,  G01R33/0322

Abstract: Provided are an inspection device and an inspection method capable of achieving improved magnetic field sensitivity by using a magnetic thin film of a small film thickness. A light-emitting unit 1 emits light of a first wavelength for acquiring magnetic field inspection information and a second wavelength for acquiring inspection object surface information. A selection unit 6 selects information from an inspection object 4 and information from a magnetophotonic crystal film 3 acquired by light irradiation performed by an irradiation unit 2. An image generation unit 9 generates image data based on the magnetic field inspection information acquired with the first wavelength and the inspection object surface information acquired with the second wavelength selected by the selection unit. Each of the generated image data is displayed on a display unit 10.

Abstract translation: 提供能够通过使用薄膜厚度的磁性薄膜来实现提高的磁场灵敏度的检查装置和检查方法。 发光单元1发射用于获取磁场检查信息的第一波长的光和用于获取检查对象表面信息的第二波长。 选择单元6从检查对象4中选择信息和通过照射单元2进行的光照射而获得的来自磁光子晶体膜3的信息。图像生成单元9基于以第一波长获取的磁场检查信息来生成图像数据 以及由选择单元选择的用第二波长获取的检查对象面信息。 所生成的图像数据中的每一个显示在显示单元10上。

公开(公告)号：US20130241541A1

公开(公告)日：2013-09-19

申请号：US13787953

申请日：2013-03-07

Applicant: HITACHI, LTD.

Inventor： Hisashi ENDO ,  Akira NISHIMIZU ,  Noriyuki SADAOKA

IPC: G01N27/87

CPC classification number: G01N27/87 ,  G01N27/902 ,  G01R33/385

Abstract: Provided is an eddy current inspection device, an eddy current inspection probe and an eddy current inspection method that make it possible to detect defects existing in deeper parts of test objects. Three or more odd number of excitation coils are arranged at even intervals in a circumferential direction on a postulated circumference. Excitation currents applied to the excitation coils are controlled so that the phase difference between excitation currents applied to adjacent ones of the excitation coils arranged in the circumferential direction on the postulated circumference equals one cycle divided by the number of excitation coils. A magnetic field generated according to an eddy current occurring in the test object due to a magnetic field caused by the application of the excitation currents to the excitation coils is detected by use of a detector arranged on a postulated plane containing the postulated circumference but inside the postulated circumference.

Abstract translation: 提供涡流检查装置，涡流检查探针和涡流检查方法，可以检测测试对象的较深部分中存在的缺陷。 三个或更多个奇数个励磁线圈在假定圆周上沿圆周方向以均匀间隔布置。 控制施加到激励线圈的励磁电流，使得施加到在假想圆周上沿圆周方向布置的相邻激励线圈的激励电流之间的相位差等于一个周期除以激励线圈的数量。 通过使用布置在包含假定圆周的假定平面上的检测器来检测由于通过向激励线圈施加激励电流而引起的由磁场引起的在测试对象中产生的涡流产生的磁场， 假定圆周