Lecture 10: Bolometers - Leiden Observatory

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T0 Detection of Light: Lecture 11 Two time constants Heat flowing out of the bolometer through the thermal link gives rise to AND The electrical power changes with an electrical time constant ⌧E = ⌧T = C G C G ↵(T )PI
Detection of Light: Lecture 10 Noise and NEP There is Johnson noise, characterised by the noise voltage VJ = 1/2 R CASE 1: if VJ is added to the bias voltage, the dissipated power P increases and R decreases (because of the negative resistance coefficient) so the voltage across the detector decreases CASE 2: if VJ opposes the bias voltage, the dissipated power P decreases and R increases, so net voltage across the detector still decreases In both cases, the detector response opposes the ohmic voltage change resulting from Johnson noise (negative electrothermal feedback) = 4kT f R (T ) < 0
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 and 18: R vs T for intrinsic semiconductor
Page 19 and 20: Detection of Light: Lecture 10 Appr
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: Two sources of Bolometer Heating T0

Lecture 10: Bolometers - Leiden Observatory

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