The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 07, 1981
Filed:
Jul. 26, 1979
Hajime Yamamoto, Hitachi, JP;
Shigehiro Shimoyashiki, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An electrically conductive metal is arranged within a passage for sodium having leaked, and the temperature change of the electrically conductive metal attributed to the heat of vaporization of which the sodium mist deprives the electrically conductive metal upon contact with the latter and subsequent vaporization is detected. The temperature change of the electrically conductive metal is detected in the form of a change in the current or voltage conducting property, and current corresponding to the temperature change is fed back to the electrically conductive metal. The change of the conducting property is taken out as a pulse signal, and a value proportional to the weight of a sodium mist particle is detected from the magnitude of the signal. Further, a value proportional to the weight of the whole mist is detected by the pulse height analysis. The leakage of the sodium is decided by comparing the value of the weight of the whole mist with a predetermined value. The sodium leakage may well be decided by comparing the number of the pulse signals with another predetermined value.