Thermal measuring and testing – Calorimetry – Total radiant energy or power measurement
Patent
1994-07-27
1997-06-03
Gutierrez, Diego F. F.
Thermal measuring and testing
Calorimetry
Total radiant energy or power measurement
374142, 374 45, G01K 1700, G01K 1300
Patent
active
056347189
ABSTRACT:
A detector of X-ray and the like in which very good resolution of energy can be obtained. The device is based on two basic components. The first is the x-ray absorber in which an x-ray interacts with a film and converts its energy into heat. Because the absorber is operated at cryogenic temperatures, approximately the range of 0.01 Kelvin to 1 Kelvin, its heat capacity is small and causes a measurable temperature rise. The second component of the invention is a base layer of normal metal which absorbs the heat generated by the x-ray. The third component of the invention is the method to detect the temperature rise. This thermometer is based on a normal metal-insulator-superconductor tunnel junction, where part of the base layer is the normal metal. When the tunnel junction is electrically biased at a voltage slightly below the gap voltage of the superconductor, the electrical current that flows through the junction is sensitively dependent on the temperature of the normal metal.
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Castles Steve
Martinis John
Nahum Michael
Gutierrez Diego F. F.
The United States of America as represented by the Secretary of
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