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Transactions of the Society of Instrument and Control Engineers
An automatic two wavelength pyrometer without a drift was achieved by using zero method The application of zero method permits the use of photosensors whose stability in spectral responses is rather poor. A feedback system including two variables was newly developed for this instrument. In order to detect the differences between object and reference lights at two wavelengths, the instrument is equipped with a rotating mirror which guides object and reference radiations alternately to a pair ofdoi:10.9746/sicetr1965.3.149 fatcat:gz3jjchdurdc5bb3uynsw63nki