Selecting the Pitch of a Double Crystal Transducer in Ultrasonic Testing of Products Made of Complex Structured Materials with a Nonplanar Surface.

Autor:	Kartashev, V. G., Kachanov, V. K., Sokolov, I. V., Fadin, A. S., Timofeev, D. V.
Předmět:	ULTRASONIC transducers COMMERCIAL product testing ULTRASONIC testing SURFACES (Technology) TRANSDUCERS CROSS correlation SPATIOTEMPORAL processes SIGNAL processing
Zdroj:	Russian Journal of Nondestructive Testing; Dec2019, Vol. 55 Issue 12, p887-897, 11p
Abstrakt:	It is noted that the ultrasonic testing of products made of complex structured materials is based, as a rule, on spatiotemporal signal processing, using ultrasonic antenna arrays to extract useful echo signal from pattern noise. If the product has a nonplanar surface, one should use a synthesized aperture antenna, which is a double crystal transducer (DC PET) moved along the product surface in steps of d. The dependence of the cross-correlation of pattern-noise instances on the distance between two DC PET positions was established and used to determine the optimum (maximizing the signal–to–pattern-noise ratio) DC PET movement step d, depending on transducer's aperture size. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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