公开(公告)号：US12007361B2

公开(公告)日：2024-06-11

申请号：US17281485

申请日：2019-10-10

申请人： Indian Institute of Technology Madras (IIT Madras)

发明人： Nishanth Raja ,  Krishnan Balasubramanian

IPC分类号： G01N29/032 ,  G01N29/06 ,  G01N29/24

CPC分类号： G01N29/032 ,  G01N29/0645 ,  G01N29/2462 ,  G01N2291/02818 ,  G01N2291/02836 ,  G01N2291/02881

摘要： The invention discloses methods for simultaneously measuring various properties of a fluid using a waveguide. The method includes transmitting a plurality of wave modes into the fluid using an ultrasonic shear wave transducer from one end of a waveguide. Further, the wave modes are reflected from the other end of the waveguide. The reflected wave modes are processed simultaneously. The time of flight and the amplitude of the received wave modes are determined. Further, one or more properties of the fluid are measured using determined time of flight and amplitude of the received wave modes. The disclosed method is used to accurately measure the properties of fluid such as level, density, viscosity or flow rate in a short period of time.

公开(公告)号：US20230018319A1

公开(公告)日：2023-01-19

申请号：US17779628

申请日：2020-11-06

申请人： Indian Institute of Technology Madras (IIT Madras)

发明人： Krishnan Balasubramanian ,  Siddharth Shankar

IPC分类号： G01N29/24 ,  G01N29/26 ,  G01N29/04

摘要： A staggered magnet array (SMA) based electromagnetic acoustic transducer (EMAT) system and method for controlling the direction of the ultrasonic waves in the electromagnetic acoustic transducer (EMAT) using staggered magnet array (SMA) configurations, is disclosed herein. The EMAT device proposed herein comprises at least one conductive racetrack coil and at least two magnet arrays wherein the magnet array comprises of permanent magnets, where each magnet is oriented according to a specific configuration to produce ultrasonic waves in order to form an ultrasonic beam by shifting the position of the magnet arrays up or down creating a SMA configuration.

公开(公告)号：US12066407B2

公开(公告)日：2024-08-20

申请号：US17605991

申请日：2020-04-13

申请人： INDIAN INSTITUTE OF TECHNOLOGY MADRAS (IIT MADRAS)

发明人： Krishnan Balasubramanian ,  Nived Suresh

IPC分类号： G01N29/24

CPC分类号： G01N29/2412 ,  G01N2291/02854 ,  G01N2291/0422

摘要： This invention provides a method for finding the remnant thickness of a structure. A feature of guided waves known as the cut-off property is used to determine the remnant thickness of structures. Fundamental guided wave modes do not possess cut-off property, but higher order modes do. The cut-off thickness of a particular mode is the minimum thickness required for that mode to travel through the guided medium. The invention uses a wide-bands of frequency and wavelength to generate the modes using appropriate magnets and excitation signal shape to provide a low cost and rapid evaluation of remnant thickness of structure.