Lecture 10: Bolometers - Leiden Observatory

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Detection of Light: Lecture 10 The Bolometer Readout Circuit Johnson noise is NOT the limiting factor for bolometers so we don’t worry about setting high R We can use this circuit to measure the bolometer resistance R. Vbias RL R Vout We assume so that the current through the bolometer is limited by RL RL >> R
R vs T for intrinsic semiconductor Bolometers measure the resistance R via Vout Vbias RL R Vout Detection of Light: Lecture 10 Rd = ...where the number of charge carriers is: So, R depends on the temperature: From previous lectures, we know that: 1 l wd n0 =2 = 1 qn0µn ✓ 2m ⇤ nkT h 2 l wd ◆ 3/2 R = R0T 3/2 e B/T ...where and are constants R0 e (Ec EF )/kT B
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: Temperature Coefficient of Resistan
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 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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