KABEL FOR ANVENDNING VID PAVISANDE AV TEMPERATURVARIATION OVER ELLER UNDER ETT FORUTBESTEMT VERDE JEMTE SETT ATT FRAMSTELLA SADAN KABEL

摘要

A method and apparatus for detecting a temperature variation above or below a predetermined value by providing in the area where the temperature variation is to be detected an electrical circuit comprising at least two parallel conductors. The conductors are insulated from each other by a dielectric material and have positioned between them a quantity of a magnetically soft ferromagnetic material having a Curie point approximately equivalent to the predetermined temperature. By transmitting a pulse along said circuit and measuring the time interval before a reflection of the said pulse is detected, the location of a temperature variation can be detected.