Lecture 10: Bolometers - Leiden Observatory

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Temperature kept low for good resistivity properties Bolometers suffer from the same fundamental noise mechanisms as photoconductors Detection of Light: Lecture 10 PLUS the noise arising from thermal fluctuations Keep temperature of the bolometer very low T
Detection of Light: Lecture 10 Approximations for the temperature coefficient of resistance The electrical resistance for hopping can be described by: ( /T )✏ R = R0e ...where ⇡ 1/2 and is a characteristic temperature ⇡ 4 10K The temperature coefficient of resistance is defined as: (T )= 1 R dR dT = 1 R0e ( /T )1/2 d dT (R0e ( /T )1/2 ) ⇡ 1 2 (T )= 1 R Substituting the hopping resistance into the above equation we get: ALTERNATIVELY T> R = R0 For one gets empirically that However, in both cases the point is that: ✓ T T0 = f(T ) ◆ A and so ✓ T 3 dR dT ◆ 1/2 (T ) ⇡ A T ...with A = 4
Page 1 and 2: Detection of Light: Lecture 10 Dete
Page 3 and 4: Three Basic Types of Detectors •
Page 5 and 6: A milestone in the history of bolom
Page 7 and 8: Detection of Light: Lecture 10 Stat
Page 9 and 10: Basic Operation of a Bolometer T0 W
Page 11 and 12: Steady State Operation of a Bolomet
Page 13 and 14: Bolometer Thermal Time constant The
Page 15 and 16: Temperature Coefficient of Resistan
Page 17: R vs T for intrinsic semiconductor
Page 21 and 22: Detection of Light: Lecture 10 Elec
Page 23 and 24: etermining responsivity at V0 The r
Page 25 and 26: Detector responsivity from electric
Page 27 and 28: Two sources of Bolometer Heating T0
Page 29 and 30: Detection of Light: Lecture 10 Nois

Lecture 10: Bolometers - Leiden Observatory

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