公开(公告)号：US20240167982A1

公开(公告)日：2024-05-23

申请号：US18474985

申请日：2023-09-26

申请人： China Special Equipment Inspection and Research Institute

发明人： Junjiao ZHANG ,  Yongna SHEN ,  Gongtian SHEN ,  Zhiquan WANG ,  Daqing CHEN

IPC分类号： G01N29/30 ,  G01N29/04 ,  G01N29/14

CPC分类号： G01N29/30 ,  G01N29/04 ,  G01N29/14

摘要： An apparatus and method for testing sensitivity consistency of an acoustic emission sensor are provided. The apparatus uses a cylindrical polymethyl methacrylate (PMMA) rod as a test bench. A clamping seat, a clamping block, and a mounting cylinder are mounted on one end of the test bench in cooperation. Under an action of a pressure spring, an end face of a tested sensor keeps pressure-stable coupling contact with an end face of the test bench. A bracket is mounted on another end face of the test bench, and keeps, together with a fixing seat and the clamping seat, the test bench horizontally placed on a desktop. By adjusting a width and an amplitude of a pulse excitation signal of a signal generator, and according to sensitivity distribution and aggregation between tested sensors, a consistency calculation method is used to screen out tested sensors with first, second, and third sensitivity consistency.

公开(公告)号：US20240337553A1

公开(公告)日：2024-10-10

申请号：US18401535

申请日：2023-12-31

申请人： China Special Equipment Inspection and Research Institute

发明人： Yongna SHEN ,  Gongtian SHEN ,  Bin HU ,  Junjiao ZHANG ,  Yufeng OUYANG ,  Mengjun LI

IPC分类号： G01M3/24 ,  F17C13/02 ,  F17C13/12

CPC分类号： G01M3/24 ,  F17C13/02 ,  F17C13/126 ,  F17C2221/033 ,  F17C2250/0465 ,  F17C2250/0486 ,  F17C2260/044

摘要： Disclosed is a method for detecting leakage of a full-capacity liquefied natural gas (LNG) storage tank by acoustic emission. The method includes: detecting an amplitude of system noise by an acoustic sensor, and determining a signal acquisition threshold; acquiring an amplitude of ambient noise; acquiring an amplitude of the acoustic signal excited by the analog sound source at the distance of 0.1 m from the acoustic sensor and an amplitude of the acoustic signal excited by the analog sound source at the distance of x m from the acoustic sensor, and calculating, an attenuation coefficient of an acoustic signal passing through the outer wall of the storage tank; determining a maximum detection range of the acoustic sensor; and continuously moving the acoustic sensor on the outer wall of the storage tank in a step smaller than the maximum detection range, to perform an LNG leakage detection.