High temperature and broadband immersion ultrasonic probes

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DOIResolve DOI: http://doi.org/10.1109/JSEN.2006.874026
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Journal titleIEEE Sensors Journal
Pages580587; # of pages: 8
SubjectHigh-temperature ultrasonic transducer (HTUT); immersion probe; sol-gel-spray technique; thick film; ultrasonic imaging
AbstractImmersion ultrasonic probes for measurements and imaging at high temperature are presented. The probes consist of sol–gel-sprayed thick films as piezoelectric ultrasonic transducers (UTs) directly deposited onto steel buffer rods. They operate in pulse-echo mode at temperatures up to 500°C. The operating ultrasonic frequency is between 5 MHz and 20 MHz, controlled by the film thickness. The ultrasonic thickness measurement of a steel plate with the probe fully immersed in molten zinc at 450°C was demonstrated using ultrasonic plane waves. For imaging purposes, the probing end of the steel buffer rod was machined into a semispherical concave shape to form an ultrasonic lens and achieve high spatial resolution with focused ultrasound in liquids. Ultrasonic surface and subsurface imaging using a mechanical raster scan of the focused probe in silicone oil at 200°C was also carried out. The importance of the signal-to-noise ratio (SNR) in the pulse-echo measurement is discussed.
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AffiliationNational Research Council Canada (NRC-CNRC); NRC Industrial Materials Institute
Peer reviewedYes
NRC number46954
NPARC number15861566
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Record identifier14a21372-5427-4cd5-b0f2-1933b15e2605
Record created2010-07-23
Record modified2016-05-09
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