Table of Contents 62 Articles in Issue: 2010-05-01 | |
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Exhibitors (10) | |
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Title / Author(s) / Keywords
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Publication |
 Free for all NDT Events: Conference Program & Proceedings Software from NDT.net NDT.net 114, Bad Breisig, Germany NEWS
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|  1st Call for Papers: Online Workshop Simulation in NDT 2010 NDT.net 114, Bad Breisig, Germany NEWS
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|  AGR re-inforces business in the UAE Technology Design Ltd 44, Winsford, United Kingdom NEWS
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|  Olympus Introduces New Long Scopes for IPLEX LX And IPLEX LT Industrial Videoscopes Olympus Scientific Solutions Americas (OSSA) 230, Waltham, MA, USA NEWS
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|  Midas NDT News - March / April 2010 Midas NDT Systems Ltd. 13, Ross-on-Wye, United Kingdom NEWS
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|  TecScan Systems introduces a new C-Scan imaging software for bond testing: TecView<sup>TM</sup> BT TecScan Systems 25, Boucherville, Quebec, Canada NEWS
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|  Young company X-RAY WorX from Garbsen/Germany aims at the global market for high resolution microfocus X-ray tubes X-RAY WorX GmbH 17, Garbsen, Germany NEWS
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|  Das junge Unternehmen X-RAY WorX aus Garbsen will den Weltmarkt für hoch auflösende Mikrofokus-Röntgenröhren erobern X-RAY WorX GmbH 17, Garbsen, Germany NEWS DE
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|  CANDU Owners Group and Canadian Institute for NDE announce Plenary Speakers and Preliminary Program for the 3rd. International CANDU In Service Inspection and NDT in Canada 2010 Conference Canadian Institute for NDE (CINDE) 27, Hamilton, ON, Canada NEWS
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|  Nondestructive Test Equipment - New Market Report Published companiesandmarkets.com, London, United Kingdom NEWS
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|  Imperium, Inc. Signs Strategic Distribution Agreement With Test Equipment Distributors, LLC Imperium Inc 18, Beltsville, MD, USA NEWS
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|  Terahertz Systems: Technology and Emerging Markets Thintri, Inc., New York, NY, USA NEWS
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|  PNNL?s Posakony honored with AAES 2009 John Fritz Medal Pacific Northwest National Laboratory (PNNL) 26, Richland, WA, USA NEWS
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|  Proceq Launches Pundit Lab Ultrasonic Concrete Test Equipment Proceq S.A. 20, Schwerzenbach, Switzerland NEWS
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|  Mistras Creates one of the Largest Gantry Scanning Systems to Date MISTRAS Products & Systems 72, Princeton Junction, NJ, USA NEWS
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|  Spring 2010 - PAC AE News MISTRAS Products & Systems 72, Princeton Junction, NJ, USA NEWS
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|  In-situ stress measurement in concrete - a component for the geolocation of the destruction with earthquakes IBJ Technology 2, Markkleeberg, Germany NEWS
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|  Congratulation to DOPPLER moved to new added office Doppler Electronic Technologies Co., Ltd 2, Guangzhou, China NEWS
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|  Applus RTD commits itself further to North America with another acquisition Applus RTD 77, Rotterdam, Netherlands NEWS
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| Major Advancements in Very Low Frequency Ultrasound M. Bhardwaj 9 Ultran Group 11, State College, PA, USA Ultrasonic Testing (UT), air-coupled, dry-coupling, non-contact ultrasound, piezo-composite, low-frequency, aerospace, civil engineering, marine, nuclear, composite, concrete, materials characterization
Close
A number of ultrasonic testing applications, such as for very thick & attenuative composites, concrete,
lumber, construction, refractories, certain produce and processed foods, and similar materials have
been chronically limited by the availability of suitable transducers. Typically, such materials require
Very Low Frequencies (VLF), i.e., from ~50 kHz to ~200 kHz. Conventional transducers based upon
monolithic piezoelectric materials or even Polymer Matrix Piezoelectric (PMP) composites in this
frequency range are: excessively resonating, extremely noisy, low sensitivity, low signal-to-noise ratios,
very expensive. As a result VLF ultrasound has not advanced substantially.
? At Ultran we have been actively engaged in testing complex materials for a long time with a special
focus on transducers development. This effort ultimately culminated in the development of Gas Matrix
Piezoelectric (GMP?) composite (US and international patents) -- characterized by very unusual, but
highly desirable features and properties. For example, GMP?s thickness coupling constant is equal to
its longitudinal coupling constant and its radial coupling is practically zero. These characteristics make
GMP? the highest efficiency and broadband transducer material.
? Furthermore, the manufacturability of GMP? allows us to make extremely large single element devices
as well as multi-element transducers. GMP?-based contact and non-contact transducers have been
perfected from less than 50 kHz to 350 kHz frequencies.
? These transducers have helped to realize many difficult ultrasound applications, and have also opened
other possibilities . In this presentation we provide significant characteristics of GMP? transducers as
well as a number of complex applications for testing highly attenuative and thick materials.
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