Thermal measuring and testing – Temperature measurement – By electrical or magnetic heat sensor
Patent
1980-12-09
1982-09-14
Woodiel, Donald O.
Thermal measuring and testing
Temperature measurement
By electrical or magnetic heat sensor
73 492, 324 71R, G01K 700
Patent
active
043492827
ABSTRACT:
A transducer has a chamber containing a substance having a monitorable physical and/or chemical property, for example electrical conductivity, which property changes in correspondence with a change in an external influence, for example, temperature. In one embodiment, the chamber is of elongate form and changes in said monitorable property in any part of the substance along the length of the chamber are monitored by a detection means. In a further embodiment the substance is arranged to undergo an abrupt change in the said property thereof, for example, due to a phase change in the said substance, in response to a predetermined change in the external influence, and detection means is provided to detect such abrupt change.
REFERENCES:
patent: 2996917 (1961-08-01), Christoph
patent: 3332280 (1967-07-01), Fish et al.
patent: 3765243 (1973-10-01), Pickett et al.
patent: 3864976 (1975-02-01), Parker
patent: 3914688 (1975-10-01), Lev
patent: 3974317 (1976-08-01), Sharpless
Spill-Fire Alarm Systems Ltd.
Woodiel Donald O.
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