Uncooled LWIR Thermal Imaging Using Schottky Diodes
Small Business Information
SOLID STATE SCIENTIFIC CORP.
210 Brook Village Road, Suite, 38, Nashua, NH, 03062
Dr. Prabha Tedrow
AbstractSolid State Scientific Corporation (SSSC) has developed the theory of operation for the Thermonic Thermal Detector (TTD) for uncooled infrared sensing of 8 to 14 um radiation based on a schottky diode sensing element. In addition, SSSC has fabricated sample detectors with electrical characteristics that correspond to an NEDT of 6 mK, if integrated with a state of the art microbolometer multiplexer. The predicted NEDT of the TTD is thus 7 times more sensitive than the current state of the art VOx microbolometer. The thermionic thermal detector is a new type of device whose operation is not related to classic photoemissive Schottky diode photon detectors. The TTD operates uncooled with the individual elements thermally isolated (as in a microbolometer), and uses a reverse bias Schottky diode as the sensing element. For a fixed bias voltage and Schottky barrier height, the magnitude of the reverse bias current from the diode is a measure of the diode temperature. Since the reverse bias current is a Schottky diode is exponentially dependent on the temperature of the detector, it has a high temperature coefficient.
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