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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 36, Iss. 11 — Nov. 1, 1946
  • pp: 676–678

A New Light Balancing Circuit for the Non-Recording Densitometer

R. O’B. CARPENTER  »View Author Affiliations

JOSA, Vol. 36, Issue 11, pp. 676-678 (1946)

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A description is given of the application of the electron-multiplier photo-tube and the light-chopping method to the design of a densitometer. The techniques discussed are generally applicable to the measurement of very low light intensities.

R. O’B. CARPENTER, "A New Light Balancing Circuit for the Non-Recording Densitometer," J. Opt. Soc. Am. 36, 676-678 (1946)

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  1. H. Rosenberg, Zeits. f. Instrumentenkunde 45, 313 (1925).
  2. W. S. Baird, "A new non-recording densitometer," J. Opt. Soc. Am. 31, 179–180 (Feb. 1941).
  3. G. M. B. Dobson, Proc. Roy. Soc. 104, 248 (1923).
  4. G. R. Harrison, in Chapter IX of W. E. Forsythe's Measurement of Radiant Energy (McGraw-Hill Book Company, Inc., New York, 1937), p. 291.
  5. A. C. Hardy, "A recording photoelectric color analyzer," J. Opt. Soc. Am. 18, 96 (1929).
  6. For properties of these tubes see manufacturer's data and G. H. Dieke, "The use of multiplier phototubes in spectrographic analysis," OPRD-WPB, Report No. W-193, May 1, 1945.
  7. H. H. Scott, "A new type of selective circuit and some applications," Proc. I.R.E. 26, 226 (Feb., 1938).

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