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Ein Phasengetasteter Hochfrequenzgleichrichter Für Modulierte Rauschspannungen Und Seine Anwendung in Einem Radioastronomischen Mehrkanalempfänger by Luzian Velden

Ein Phasengetasteter Hochfrequenzgleichrichter Für Modulierte Rauschspannungen Und Seine Anwendung in Einem Radioastronomischen Mehrkanalempfänger

by Luzian Velden
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Book cover type: Paperback
  • ISBN13: 9783663061540
  • Binding: Paperback
  • Subject: N/A
  • Publisher: Vs Verlag Fur Sozialwissenschaften
  • Publisher Imprint: Vs Verlag Fur Sozialwissenschaften
  • Publication Date:
  • Pages: 62
  • Original Price: EUR 51.39
  • Language: German
  • Edition: 1964
  • Item Weight: 118 grams
  • BISAC Subject(s): General

Bei der Arbeit auf dem Gebiet der Mikrowellenspektroskopie ist es im allge- meinen notwendig, das Signal einen Verstärker durchlaufen zu lassen, um dann die Me grö e nach der Gleichrichtung auf einem Anzeigeinstrument sichtbar machen zu können. Die Verstärker zeigen bei hohen Verstärkungen die unange- nehme Eigenschaft, das verstärkte Signal mit einem Rauschen, welches von statistischen Vorgängen im Me system herrührt, zu überlagern. Am Ausgang des Gleichrichters macht sich dieser Eigenrauschpegel als eine Gleichspannung be- merkbar, die auch bei nicht vorhandenem Eingangssignal auftritt. Eine Kompen- sation dieser Spannung durch eine feste Gleichspannung ist nur dann von Nutzen, wenn ihre Schwankungen kleiner als das zu messende Ausgangssignal sind. Anderenfalls überwiegen die Schwankungen des Anzeigeinstrumentes, die auf Eigenrauschschwankungen zurückzuführen sind, die durch das Signal hervor- gerufenen Ausschläge und begrenzen somit das Auflösungsvermögen. Ist jedoch die Signalfrequenz oder die Signalfolgefrequenz bekannt, so ist durch die phasenempfindlichen und phasengeschalteten Gleichrichter eine Möglichkeit gegeben, ein Differenzme verfahren anzuwenden. Schwankungen des Störpegels beeinflussen das Ausgangssignal nicht mehr, Verstärkungsschwankungen gehen nicht mehr proportional zu Signal plus Störpegel, sondern nur noch proportional zum Signal auf die Messung ein. Das Ziel der Untersuchungen war, einen phasenempfindlichen Gleichrichter zu finden, der die Konstanzanforderungen eines radioastronomischen HI-Linien- empfängers erfüllt und durch einen geringen elektronischen Aufwand seine An- wendung in einem Mehrkanalempfänger erlaubt. Die prinzipiell mögliche Verbesserung des Temperaturauflösungsvermögens durch ein anderes Demodulationsverfahren als das bisher verwendete sollte aus- genutzt werden. Weiterhin war es notwendig, die Störanfälligkeit der früheren Schaltung gegen niederfrequente Signaleinstreuung in der neuen Schaltung zu beseitigen.

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