Method and apparatus for determining the thermal time constant o

Details Method and apparatus for determining the thermal time constant o Method and apparatus for determining the thermal time constant o

1990-08-03

1991-09-03

Levy, Stuart S.

Thermal measuring and testing

Determination of inherent thermal property

374 44, 324105, 324 711, 7320414, 364481, 364487, G01N 2520

Patent

active

050447661

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.

REFERENCES:
patent: 4630938 (1986-12-01), Piorkowska-Palczewska et al.
patent: 4728887 (1988-03-01), Davis
patent: 4888987 (1989-12-01), Zhang

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