AT74657B - Electrical discharge vessel for pure electron discharge. - Google Patents

Electrical discharge vessel for pure electron discharge.

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Publication number
AT74657B
AT74657B AT74657DA AT74657B AT 74657 B AT74657 B AT 74657B AT 74657D A AT74657D A AT 74657DA AT 74657 B AT74657 B AT 74657B
Authority
AT
Austria
Prior art keywords
discharge
pure electron
vessel
electrical
thorium
Prior art date
Application number
Other languages
German (de)
Original Assignee
Aeg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Aeg filed Critical Aeg
Application granted granted Critical
Publication of AT74657B publication Critical patent/AT74657B/en

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Description

  

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   Beweis dafür,   dass die hohe Elektronenaussendung einer Thoriumhaut zuzuschreiben ist, bildet die Tatsache, dass metallisches Thorium selbst bei Freiheit von oberflächlicher Oxydation eine sehr hohe Elektroenenaussendung für eine gegebene Temperatur im Vergleich mit Wolfram auf- 
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 infolge seines niedrigen Schmelzpunktes und seiner leichten Oxydierbarkeit. 



   Bei 2000 bis 2300  K diffundiert das aktive Thorium langsam aus dem Innern des Metalles nach der Oberfläche. Bei steigender Temperatur wird ein Punkt erreicht, in welchem die Ver- 
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 Kathode bei einer Temperatur zwischen   2000 und 22000 K lange   Zeit zu betreiben, ohne ihre hohe Elektronenaussendung zu zerstören, doch   ist der Betrieb bei höherer   Temperatur nicht empfehlenswert. Es kann bereits in dem oben angegebenen Temperaturbereich eine grosse Elektronenaussendung unter gleichzeitiger Ersparnis an Energie für die Erhitzung der Kathode erzielt werden. 



   Entladungsgefä2e mit Kathoden der angegebenen Art können für die verschiedensten Zwecke benutzt werden, z. B. als Gleichrichter oder zur Verstärkung von elektrischen Schwingungen usw. Das Thorium muss in    derKathodenichtvon vomeherein   bei ihrer Herstellung enthalten sein, sondern es kann auch eine zunächst thoriumfreie Kathode dadurch 
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   hinausgpht. Diese Tatsache kann   benutzt   werden, um eine   eine thorierte Kathode   eluthaltpndL-   Entladungsröhre als eine spannungsempfindliche Ausschaltvorrichtung zu verwenden. Unterhalb 
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   Proof that the high electron emission can be ascribed to a thorium skin is the fact that metallic thorium has a very high emission of electrons for a given temperature compared to tungsten, even if it is free from superficial oxidation.
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 due to its low melting point and its easy oxidizability.



   At 2000 to 2300 K the active thorium slowly diffuses from the inside of the metal to the surface. As the temperature rises, a point is reached at which the
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 To operate the cathode at a temperature between 2000 and 22000 K for a long time without destroying its high electron emission, but operation at a higher temperature is not recommended. A large amount of electrons can be emitted in the temperature range specified above, while at the same time saving energy for heating the cathode.



   Discharge vessels with cathodes of the specified type can be used for a wide variety of purposes, e.g. B. as a rectifier or to amplify electrical oscillations, etc. The thorium does not have to be inherently contained in the cathode during its manufacture, but it can also create an initially thorium-free cathode
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   outgpht. This fact can be used to use a thoriated cathode eluthaltpndL discharge tube as a voltage sensitive cutoff device. Below
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AT74657D 1914-07-15 1915-07-08 Electrical discharge vessel for pure electron discharge. AT74657B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US74657XA 1914-07-15 1914-07-15

Publications (1)

Publication Number Publication Date
AT74657B true AT74657B (en) 1918-09-10

Family

ID=21726325

Family Applications (1)

Application Number Title Priority Date Filing Date
AT74657D AT74657B (en) 1914-07-15 1915-07-08 Electrical discharge vessel for pure electron discharge.

Country Status (1)

Country Link
AT (1) AT74657B (en)

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