Method and apparatus for determining the thermal time constant of fine metal wire segments
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United States of America Patent
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Sep 3, 1991
Grant Date -
N/A
app pub date -
Aug 3, 1990
filing date -
Aug 3, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The thermal time constant of fine metal wire segments, such as those used to initiate explosive reactions, is measured by passing a variable frequency source of current through the wire. The magnitudes of the sine and cosine components of the third harmonic of the voltage developed across the wire are detected and compared to each other to provide a control signal which is applied to the frequency source to change the its frequency in a direction which tends to make those components equal in magnitude. The magnitude of the control signal, when the third harmonic sine and cosine components are equal, is displayed as a function of the thermal time constant of the wire segment.
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