Temperature threshold detectors

Induced nuclear reactions: processes – systems – and elements – Testing – sensing – measuring – or detecting a fission reactor... – Temperature or pressure measurement

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374176, 374184, G21C 1700, G01K 738

Patent

active

045767815

ABSTRACT:
A threshold temperature is detected by providing a sensor (12) comprising a magnet (13) inside a ferromagnetic shield (14) which has a lower Curie point than that of the magnet. Below threshold the sensor is magnetically characterless. Above threshold the sensor displays a magnetic character which is detected at a solid-state magnetometer (16). In one application the sensor is located in a breeder fuel sub-assembly (20) at the breeder/fuel region (22) of a fast-fission nuclear reactor and the magnetometer is located in a fuel sub-assembly (21). In another application the sensor is located inside a sealed containment vessel and the magnetometer is located outside the vessel.

REFERENCES:
patent: 2460773 (1949-02-01), Stimson
patent: 2615973 (1952-10-01), Heath
patent: 3087886 (1963-04-01), Robinson
patent: 3564401 (1971-02-01), Coon
patent: 3950993 (1976-04-01), Sidor
patent: 3976540 (1976-08-01), Sowa
patent: 4304632 (1981-12-01), Bhate et al.
patent: 4371272 (1983-02-01), Iwasaki
patent: 4405558 (1983-09-01), Mangus et al.

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