Infrared calibration sources (emitters) have been built using a "reverse bolometer" approach. A NiCr thin film is deposited on a thin sapphire chip, forming a robust, resistive heater with high emissivity. The heater is suspended within a metal ring using nylon fibers, and electrically connected with low thermal conductivity wires. They provide a wide range of greybody output (nominally 10K to 300K) with minimal power dissipation to the cold bath. Under typical operating conditions, a 40K equivalent blackbody output can be obtained with 1 to 2 mW electrical input power. The devices will be used for in-flight array calibration in the Multiband Imaging Photometer for SIRTF (MIPS) and the SPIRE instrument for the Herschel mission.
Far-IR Calibration Sources for Cryogenic Focal Planes / Beeman, Jeffrey W.; Collins, Patrick; Hargrave, Peter; Pisano, Giampaolo; Haller, Eugene E.. - (2002). (Intervento presentato al convegno Far-IR, Sub-MM & MM Detector Technology Workshop tenutosi a Monterey, CA (USA)).
Far-IR Calibration Sources for Cryogenic Focal Planes
Giampaolo Pisano;
2002
Abstract
Infrared calibration sources (emitters) have been built using a "reverse bolometer" approach. A NiCr thin film is deposited on a thin sapphire chip, forming a robust, resistive heater with high emissivity. The heater is suspended within a metal ring using nylon fibers, and electrically connected with low thermal conductivity wires. They provide a wide range of greybody output (nominally 10K to 300K) with minimal power dissipation to the cold bath. Under typical operating conditions, a 40K equivalent blackbody output can be obtained with 1 to 2 mW electrical input power. The devices will be used for in-flight array calibration in the Multiband Imaging Photometer for SIRTF (MIPS) and the SPIRE instrument for the Herschel mission.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
