会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 8. 发明专利
    • GROUND VIBRATION MEASUREMENT METHOD AND MEASURING SYSTEM
    • JP2001021665A
    • 2001-01-26
    • JP19605499
    • 1999-07-09
    • SEKISUI CHEMICAL CO LTD
    • SATO YOICHI
    • E02D1/02G01H1/00G01V3/28
    • PROBLEM TO BE SOLVED: To make accurately investigable an underground structure by calculating a phase speed from the peak vector of a wave number spectrum that is obtained by phase error correction data at each frequency of a vibration sensor being installed at a plurality of points. SOLUTION: A sensitivity sensor 10 has directivity along a sensitivity axis in the direction of a vibration member 15 being extended from a post 11 of the sensor body 11, and is installed at a plurality of points in a target area. When the vibration of the perpendicular component of Rayleigh waves reach the vibration sensor 10, it is converted to an electrical signal according to the change in magnetic flux from a permanent magnet 12 passing through a coil 16. The phase error of each frequency of the electrical signal being generated due to the change in the Rayleigh waves caused by the arrangement angle of the vibration sensor 10 is obtained and is determined. Then, correction is made by a specific numeric expression based on the phase error, thus obtaining a wavenumber spectrum that only a pure phase difference contributes to. A peak wavenumber vector for maximizing the wavenumber spectrum is obtained and an accurate phase speed at that frequency is calculated by the specific numeric expression.