Abstract
A pyrometer is described which is simple and easy to construct, yet fulfils the requirements of a standards laboratory which wishes to perform radiation thermometry to very high accuracy. A test of its performance is described in which it was used to measure the ratio of the spectral radiances at 650 nm of black bodies at the melting points of silver and gold. Taking the gold-point temperature to be 1064.43 °C, this measurement gave a result of (961.961 ± 0.017) °C (99% confidence level) as the value of the silver-point temperature.
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