Low-Temperature Radiation Pyrometry using a Lead Sulphide Photoconductive Cell


THE use of photo-electric cells in radiation pyrometry has been confined to direct measurement of the cell output in terms of temperature. This limits the accuracy of the method or necessitates the use of only the most stable cells, such as the vacuum emission cell. If, however, we apply the null method which has sometimes been employed in photometric uses of photo-electric cells, where the radiation from the unknown source is compared with that from a standard source by a sufficiently rapid alternative exposure of the cell to the two sources, the stability of the cell is no longer so important. Under these conditions of use, the less-stable cells, such as the gas-filled emission cell and the photoconductive lead sulphide cell, can be used for precise measurement.

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BARBER, C., PYATT, E. Low-Temperature Radiation Pyrometry using a Lead Sulphide Photoconductive Cell. Nature 165, 691–692 (1950). https://doi.org/10.1038/165691a0

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