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Thermopile radiometer signal conditioning for surface atmospheric radiation measurements

Harrison, R. G. ORCID: and Knight, J. R. (2006) Thermopile radiometer signal conditioning for surface atmospheric radiation measurements. Review Of Scientific Instruments, 77 (11). p. 116105.

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A highly stable microvolt amplifier for use with atmospheric broadband thermopile radiometers is described. The amplifier has a nominal gain of 500, for bipolar input signals in the range +/- 10 mV from a floating source. The noise level at the input is less than 5 mu V (at 100 k Omega input impedance), permitting instantaneous diffuse solar radiation measurements to 0.5 W m(-2) resolution with 12 bit analog to digital conversion. The temperature stability of gain is better than 5 ppm/degrees C (-4 to 20 degrees C). Averaged over a decade of use, the long term drift of the amplifier gain is less than similar to 0.02%/yr. As well as radiometers measuring solar and terrestrial radiations, the amplifier has also been successfully used with low level signals from thermocouples and ground heat flux plates.

Item Type:Article
Divisions:Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
ID Code:5121
Uncontrolled Keywords:PYRANOMETER
Additional Information:116105

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