Next Article in Journal
Imaging of the Finger Vein and Blood Flow for Anti-Spoofing Authentication Using a Laser and a MEMS Scanner
Next Article in Special Issue
Vehicle Counting and Moving Direction Identification Based on Small-Aperture Microphone Array
Previous Article in Journal
State Estimation Using Dependent Evidence Fusion: Application to Acoustic Resonance-Based Liquid Level Measurement
Previous Article in Special Issue
Power MOSFET Linearizer of a High-Voltage Power Amplifier for High-Frequency Pulse-Echo Instrumentation
Article Menu
Issue 4 (April) cover image

Export Article

Open AccessArticle
Sensors 2017, 17(4), 926; doi:10.3390/s17040926

Experimental Demonstration and Circuitry for a Very Compact Coil-Only Pulse Echo EMAT

Institute of Measuring and Sensor Technology, University of Applied Sciences Ruhr-West, 45479 Muelheim, Germany
Academic Editors: Xiaoning Jiang and Chao Zhang
Received: 14 January 2017 / Revised: 7 April 2017 / Accepted: 18 April 2017 / Published: 22 April 2017
(This article belongs to the Special Issue Acoustic Sensing and Ultrasonic Drug Delivery)
View Full-Text   |   Download PDF [2615 KB, uploaded 22 April 2017]   |  

Abstract

This experimental study demonstrates for the first time a solid-state circuitry and design for a simple compact copper coil (without an additional bulky permanent magnet or bulky electromagnet) as a contactless electromagnetic acoustic transducer (EMAT) for pulse echo operation at MHz frequencies. A pulsed ultrasound emission into a metallic test object is electromagnetically excited by an intense MHz burst at up to 500 A through the 0.15 mm filaments of the transducer. Immediately thereafter, a smoother and quasi “DC-like” current of 100 A is applied for about 1 ms and allows an echo detection. The ultrasonic pulse echo operation for a simple, compact, non-contacting copper coil is new. Application scenarios for compact transducer techniques include very narrow and hostile environments, in which, e.g., quickly moving metal parts must be tested with only one, non-contacting ultrasound shot. The small transducer coil can be operated remotely with a cable connection, separate from the much bulkier supply circuitry. Several options for more technical and fundamental progress are discussed. View Full-Text
Keywords: EMAT; pulse power; contactless ultrasound transduction; Lorentz forces; ultrasound echo recording EMAT; pulse power; contactless ultrasound transduction; Lorentz forces; ultrasound echo recording
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Rueter, D. Experimental Demonstration and Circuitry for a Very Compact Coil-Only Pulse Echo EMAT. Sensors 2017, 17, 926.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top