Lecture 10: Bolometers - Leiden Observatory

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Measuring Electrical Responsivity The detector properties G and (T ) are not always known and you need to determine them by measurement You measure the “load curve” of I-V by adjusting the load resistor RL Vbias RL R Vout Detection of Light: Lecture 10 Note that the local slope is different from “the resistance” R because of the non-linearity of the load curve. Slope of the load curve is: Z = dV dI Nominal operating point The Load Curve
etermining responsivity at V0 The resistance at the point V0 is: Z = R The local slope is: If you now rewrite Z as follows..... Z = dV dI Detection of Light: Lecture 10 d(log P ) d(log R) H +1 H 1 = R d(log V ) d(log I) = 1 I 2 R0 = V0/I0 (dI/dV )0 =1/Z0 = R dP dR so H = Z + R Z R d(log P ) d(log R) +1 d(log P ) d(log R) 1 ...we can now find an expression for d(log P)/d (log R): = 1 I 2 G = P T dP dT dT dR = (T )= 1 R G (T )I 2 R dR dT = G (T )P = H P = V ⇥ I = I 2 R Z and R can be measured, so we can get H, then back to determine G and a(T)
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: Detection of Light: Lecture 10 Elec
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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