Industrial Consultancy & Sponsored Research (IC&SR) , IIT Madras
Staggered Magnet Array (SMA) Based Electromagnetic Acoustic Transducer (EMAT)
Categories for this Invention
Technology: Staggered magnet array (SMA) based electromagnetic acoustic transducer (EMAT);
Industry & Application: Nondestructive testing & Medical imaging, Automotive, Pipeline, Aerospace, others;
Market: The global Electromagnetic Acoustic Transducer(EMAT) market size is expected to grow at a CAGR of 7.5% from 2024 to 2030.
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Problem Statement
- In the present era, the design of EMATs enable users to generate specific wave modes & the ultrasound is produced immediately below the surface of the inspected specimen having various issues.
- There is a need for an improved staggered magnet array (SMA) based electromagnetic acoustic transducer (EMAT) system for controlling the direction of ultrasonic wave depending on the industrial application & also, a need exists for a SMA based EMAT system & method for controlling the direction of the ultrasonic waves in the EMAT using SMA configurations. Present invention provides the solution in efficient manner.
Technology
- Claimed patent describes a staggered magnet array (SMA) based electromagnetic acoustic transducer (EMAT) system. The system comprises:
- at least one conductive racetrack coil; &
- at least two magnet arrays comprises of permanent magnets, where each magnet is oriented according to a specific hybrid configuration having at least one of periodic permanent magnet (PPM) & linear Halbach array magnet (HBA) configuration to produce different ultrasonic waves in order to form an different ultrasonic beam by mechanical movement for shifting the position of at least one magnet in the magnet arrays of PPM & HBA configuration in up or down direction to creating a SMA configuration at fixed frequency, shown in Fig. 1.
- Further, a multiple magnet arrays EMAT for beam forming comprises: 2 array EMAT configuration, 3 array EMAT configuration, 4 array EMAT configuration, 5 array EMAT configuration & multi-array EMAT configuration. (Refer Fig.2)
Key Features / Value Proposition
Enhanced Performance:
- The proposed system provides the SMA based EMAT allows for the dynamic or static focusing or defocusing of ultrasonic beams and thereby enhance the results or data obtained in the industrial application.
Handy by the Operator:
- Proposed system allows the operator to steer the beam at different angles using a single transducer.
Universal Economical Solution:
- The SMA based EMAT prototype can have small footprint, low cost, and offer a universal solution for producing static or dynamic beam forming through simple mechanical movement of the magnets.
Other Important Features:
- The magnetic configurations in the SMA based EMAT system can be dynamically manipulated through the mechanical movement of the magnet arrays, thereby manipulating the ultrasonic beams from the EMAT.
Experimental Setup Details:
- The setup contains both PPM and Halbach array, the chosen EMAT frequency was 118 kHz, which was the midpoint frequency between 80 kHz and 156 kHz. (Shown in Figure)
Questions about this Technology?
Contact For Licensing
sm-marketing@imail.iitm.ac.in
ipoffice2@iitm.ac.in
Research Lab
Prof. Krishnan Balasubramanian
Department of Mechanical Engineering
Intellectual Property
- IITM IDF Ref. 1925; IN Patent No. 512822
- PCT Application No. PCT/IN2020/050936
- US Publication No. US-2023-0018319-A1
Technology Readiness Level
TRL-4
Technology validated in Lab