Thermal Transient Test Apparatus
An apparatus for evaluating the thermal transient behavior of an electroexplosive device is described. The thermal response provides nondestructive testing insight with respect to device design and behavior. Abnormal responses may be indicative of imminent failure and the apparatus provides a rapid evaluation method for quality control.
Correlation between Ignition Time and Thermal Time Constant in 1W-1A HBW EED’s
Correlation between ignition time and thermal time constant is successfully demonstrated for NSItype EED’s. The result can correctly predict all key ignition features of interest including the 1W-1A No-Fire sensitivity, statistical No-Fire/All-Fire limits, acceptance firing test ignition time and system level firing ignition time, as a function of ambient temperature. Accept/reject criteria based on thermal time constant are assessed for lot and unit quality verifications. By application of this testing technique, it appears to be promising to streamline EED testing and sample size from that currently specified by the ECS Standards. Detailed formulation and physical interpretations of the methodology are reported along with possible further improvements. Included also are a history of T 3 test milestones and technique evolution, analysis of signal exponential behavior and possible interpretations of abnormal or erratic signal behaviors. The general approach is applicable to various EED designs in general.
Electrothermal follow display apparatus for electroexplosive device testing
By employing a self-balancing bridge it is possible to ascertain the electrothermal and nonlinear behavior of an electroexplosive device. A sinusoidal current is passed through the device which provides a signal in the form of a unique Lissajous display. This display can be qualitatively evaluated and abnormal units can be readily detected. vi JPL TECHNICAL REPORT 32-1554 Electrothermal Follow Display Apparatus for Electroexplosive Device Testing