Article ID Journal Published Year Pages File Type
10409926 Sensors and Actuators A: Physical 2005 6 Pages PDF
Abstract
We report on a thermal device consisting of 14 thin film Au-Pd thermocouples designed to measure the transient temperature response of a sample (a thin 50 μm thick steel foil) submitted to a single discharge. Junctions as small as 4 μm2 were patterned using standard photolithography. The distance between the junctions (i.e. the local resolution of the device) is 20 μm. Using standard electron discharge machining (EDM) equipment, the temperature response due to a single discharge was measured. The maximum measured temperature was 280 °C for a thermocouple located on the backside of the steel foil at 61 μm from the center of the discharge. Large temperature gradients of 2.5 × 106 °C/m and quench rates of 5 × 105 °C/s have been measured. Analysis of the thermovoltage noise pattern allowed precise determination of the beginning and duration of the discharge. Preliminary results of the numerical calculations are given.
Related Topics
Physical Sciences and Engineering Chemistry Electrochemistry
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