Abstract
METHODS used for obviating the effects of variation of sensitivity over the photocathode of a multiplier photocell (of the ring-dynode type) generally involve loss of sensitivity1. This loss may be avoided by the use of a rotatable mirror, so as always to direct the measured light to the same cathode region2, or of a scalloped grating which diffuses the cathode illumination3. From the work to be described it is concluded that the required smoothing of cathode response can also be obtained very simply by exploiting the diffraction at a sufficiently small hole placed before the photo-cathode.
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References
Saunderson, Caldecourt and Peterson, J. Opt. Soc. Amer., 35, 681 (1945).
Naish, J. M., J. Sci. Instr., 28, 138 (1951).
Baker, L. R., J. Sci. Instr., 32, 418 (1955).
Kessler and Wolfe, J. Opt. Soc. Amer., 37, 133 (1947).
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NAISH, J. Photometry with Multiplier Photocells. Nature 179, 269–270 (1957). https://doi.org/10.1038/179269a0
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DOI: https://doi.org/10.1038/179269a0
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