Fine wire resistance thermometer amplifier for atmospheric measurements

Harrison, R. G.; Rogers, G. W.
November 2006
Review of Scientific Instruments;Nov2006, Vol. 77 Issue 11, p116112
Academic Journal
An improved amplifier for atmospheric fine wire resistance thermometry is described. The amplifier uses a low excitation current (50 μA). This is shown to ensure negligible self-heating of the low mass fine wire resistance sensor, compared with measured nocturnal surface air temperature fluctuations. The system provides sufficient amplification for a ±50 °C span using a ±5 V dynamic range analog-to-digital converter, with a noise level of less than 0.01 °C. A Kelvin four-wire connection cancels the effect of long lead resistances: a 50 m length of screened cable connecting the Reading design of fine wire thermometer to the amplifier produced no measurable temperature change at 12 bit resolution.


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