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Über Die Ausbreitung Von Ultraschall in Luft by Harald Kickert

Über Die Ausbreitung Von Ultraschall in Luft

by Harald Kickert
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Book cover type: Paperback
  • ISBN13: 9783663037705
  • Binding: Paperback
  • Subject: N/A
  • Publisher: Vs Verlag Fur Sozialwissenschaften
  • Publisher Imprint: Vs Verlag Fur Sozialwissenschaften
  • Publication Date:
  • Pages: 77
  • Original Price: USD 49.99
  • Language: German
  • Edition: 1957
  • Item Weight: 214 grams
  • BISAC Subject(s): General

Die aufgenommenen Richtcharakteristiken der GALTON-Pfeife zeigten, da man den Generator praktisch als Kugelstrahler betrachten konnte. Daraufhin wurden die Möglichkeiten einer Schallbündelung mittels parabo- lischem und sphärischem Reflektor untersucht. Hierbei erwies sich der parabolische dem sphärischen Reflektor in Bezug auf Richtwirkung und Verstärkung als überlegen. Bei Verwendung von zwei gleichartigen Reflek- toren (einer für den Sender, der andere für den Empfänger) erhielt man eine Gesamtverstärkung, die praktisch das Produkt der Einzelverstär- kungen darstellte. Obwohl sich mit der beschriebenen Anordnung relativ hohe Verstärkungen erzielen lassen, dürfte die Anwendung im Freien (z.B. für die Nachrich- tenübertragung) wegen der hohen Störanfälligkeit nicht in Frage kommen. Die verwendete Versuchsanordnung gibt aber eine Möglichkeit, mit ver- hältnismä ig kleinem Aufwand Bündelungs-, Ausbreitungs- und Absorptions- messungen durchzuführen. Die GALTON-Pfeife erscheint wegen ihrer leich- ten Frequenzvariation hierfür besonders geeignet. c. Der H ART MAN N - Gen e rat 0 r (Nach einer Studienarbeit aus unserem Labor. u. dem Inst. f. Wärmetechnik u. Verbrennungsmotoren von G. WINTERFELD) I. Prinzip des HARTMANN-Generators Die Wirkungsweise des Generators ist in der Literatur ausführlich be- schrieben. Es wird daher nur soweit als erforderlich auf das Prinzip eingegangen.

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