An improved amplifier for atmospheric fine wire resistance thermometry is described. The amplifier uses a low excitation current (50μA). 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 ±5V 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 50m length of screened cable connecting the Reading design of fine wire thermometer to the amplifier produced no measurable temperature change at 12bit resolution.
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Harrison et al. (2006) studied this question.
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