A model of metal film resistance bolometers based on the electro-thermal feedback effect
作者： Franz Kohl , Franz Keplinger , Artur Jachimowicz , Johannes Schalko
DOI: 10.1016/J.SNA.2004.03.057
关键词: Time constant 、 Responsivity 、 Thermal runaway 、 Johnson–Nyquist noise 、 Bolometer 、 Phonon noise 、 Electrical resistance and conductance 、 Materials science 、 Condensed matter physics 、 Thermal conductivity 、 Analytical chemistry
摘要: Abstract The detectivity of metal film resistance bolometers is modeled using one main operating parameter, the self-heating Δ T . model comprises electro-thermal coupling effect on sample impedance, responsivity and time constant. simplifications are a linear dependence electrical temperature lumped thermal conductance G heat capacity C Furthermore current controlled operation perfect absorption incident infrared (IR) radiation, η =1, supposed. contributions phonon noise, Johnson noise taken into account. Because their importance consequences dependent fluctuations investigated in detail. Within this frame, yields realistic estimates achievable NEP D ∗ for given bolometer design wide range These properties compared with characteristics obtained exhibiting constant TCR, which corresponding model. Metal found to be immune against runaway due feedback effect. presented simplifies significantly competitive rating diverse designs or competing technologies.
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