Progress towards a determination of the indium freezing point by Johnson noise thermometry

被引：0
|
作者：
White, DR [1 ]
Mason, RS [1 ]
Saunders, P [1 ]
机构：
[1] Measurement Stand Lab New Zealand, Lower Hutt, New Zealand
来源：
TEMPMEKO 2001: 8TH INTERNATIONAL SYMPOSIUM ON TEMPERATURE AND THERMAL MEASUREMENT IN INDUSTRY AND SCIENCE, VOL 1 & 2, PROCEEDINGS | 2002年
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D O I：
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中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
The Johnson noise thermometer at MSL is a switching digital-correlator with the reference resistor maintained at the triple point of water. Critical blocks of the electronics system including the preamplifiers, band-pass filters and analog-to-digital converters are powered by batteries, maintained in a radio-frequency screened cabinet and isolated by fibre-optic interfaces. The final signal processing stages are carried out in real-time in the frequency domain using a personal computer. Frequency domain processing has the advantage of digital selection of the bandwidth, sensitive tests for electromagnetic interference, and compact storage of all measurements. A summary uncertainty analysis shows that an accuracy (1sigma) of 0.001% should be achievable. Progress towards the determination of the indium freezing point is reported.
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页码：129 / 134
页数：6
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