A New Automatic Two Wavelength Pyrometer Using Zero Method

Koji NEZU, Jitsuo OKADA
1967 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 of
more » ... hotosensors, one for a short wavelength and the other for a long wavelength.
doi:10.9746/sicetr1965.3.149 fatcat:gz3jjchdurdc5bb3uynsw63nki