Photon energy decreases as wavelength increases. Detection of waves in the infrared, more particularly in the thermal infrared, consequently necessitates semiconductors with a narrow forbidden gap. But by reducing the amplitude of the electronic transition, the probability increases of seeing electrons pass spontaneously into the conduction band under the simple effect of thermal agitation. It results in an increase in the noise power; in the limit, in some cases, the material itself becomes a conductor at ambient temperature. The solution evidently consists of cooling the detector.
KeywordsCooling Power Thermodynamic Cycle Pulse Tube Carnot Cycle Cold Source
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