Complex impedance measurements of calorimeters and bolometers: correction for stray impedances.
Impedance measurements provide a useful probe of the physics of bolometers and calorimeters. We describe a method for measuring the complex impedance of these devices. In previous work, stray impedances and readout electronics of the measurement apparatus have resulted in artifacts in the impedance data. The technique allows experimenters to find an independent Thevenin or Norton equivalent circuit for each frequency. This method allows experimenters to easily isolate the device impedance from the effects of parasitic impedances and frequency dependent gains in amplifiers.
Lindeman
Mark A
MA
University of Wisconsin, Madison, WI 53706, USA.
Barger
Kathleen A
KA
Brandl
Donald E
DE
Crowder
S Gwynne
SG
Rocks
Lindsay
L
McCammon
Dan
D