Untersuchungen Über Ein Prüfverfahren Für Oberflächenrisse an Zylindrischen Metallischen Prüflingen Mit Hilfe Berührungslos Elektrodynamisch Gesendete
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FUr die zerstorungsfreie PrUfung von St!ben und Rohren mittels Ultraschall-Oberfl chenwellen wird die technische Realisierung eines Dauerschall-PrUfverfahrens untersucht, das fUr den Ein- satz elektrodynamischer Wandler besonders geeignet erscheint. Hierbei wird der im Vergleich zu konventionellen piezoelektri- schen PrUfkopfen vorhandene Nachteil dieser berQhrungslosen Wandler, wegen vergleichsweise schwacher Kopplung ein zu ge- ringes Signal- zu Rauschverh ltnis aufzuweisen, durch eine be- sonders schmalbandige kontinuierliche Betriebsweise zu kompen- sieren versucht. Die vorliegende Untersuchung befaBt sich einerseits mit den theoretischen Grundlagen fUr ein derartiges Verfahren, anderer- seits werden die Losungen, die fUr die auftretenden Probleme hinsichtlich der Fertigung der Antennensysteme, der Erzeugung des benotigten Magnetfeldes, der Realisierung eines hochfre- quenten Drehstromsenders und der Gewinnung der Empfangssignale durch Quadratur-Demodulation erreicht wurden, dargestellt. Die in diesem Zusammenhang gewonnenen Erkenntnisse und Losungen dUrften auch im Hinblick auf andere als das in der vorliegenden Arbeit untersuchte Dauerschallverfahren von Bedeutung sein. - 36 - 4. Literatur [1] HERBERTZ, J.: Grundlagen und Anwendungen eines berUhrungs- losen Verfahrens zur Erzeugung und zum Nachweis von Ultra- schall in Metallen. Forschungsberichte des Laboratoriums fUr Ultraschall, Nr. 3. Verlag J.A. Mayer, Aachen. 1972 [2] VIKTOROV, I.A.: Akust. Zh. 4(1958), 131 [3] POCHHAMMER, L.: J. Math. 18(1876), 324 [4] BANCROFT, D.: Phys. Rev. 59(1941), 588 - 37 - 5. Bildanhang 0 r I 1m Prufl.ng I", INF K ., V V K r----: - Generator Sender w-O --=-- w-O Empf anger w+Q w+Q IHf Fenter IJHr I w-2, ----Stors: rahlung--- w w w+2Q I 0 HF ...lL Ana-g.
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