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3. Vogt and his colleagues made the sensor by film-screening layers of ceramic and metal on a ceramic substrate, then firing the sensor in an industrial oven at more than 1,000C. The Argonne researchers set out to build a sensor that would detect overheating computer components. Before an overheating component fails, and possibly ignites, epoxy in the circuit boards releases a gas. The Argonne sensor can detect this vapour and cut off power to the circuit.