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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 47, Iss. 4 — Apr. 1, 1957
  • pp: 306–306

Console Comparator Microphotometer Featuring High Screen Intensity and a Null-Ratio Measurement System

HAROLD B. BEAL, RICHARD K. BREHM, and RICHARD F. JARRELL  »View Author Affiliations


JOSA, Vol. 47, Issue 4, pp. 306-306 (1957)
http://dx.doi.org/10.1364/JOSA.47.000306


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Abstract

A Coparator Microphotometer of new design is described. An optical system has been developed in which all of the available light flux is used for both viewing the spectrum and measuring the transmission of selected spectral lines. Besides high viewing screen intensity and great sensitivity, a unique electronic system is employed. The advantages of this null-ratio system include: reduced drift and noise, independence of individual vacuum tube characteristics, and freedom from the logarithmic damping responce characteristic of galvanometers and meters.

Citation
HAROLD B. BEAL, RICHARD K. BREHM, and RICHARD F. JARRELL, "Console Comparator Microphotometer Featuring High Screen Intensity and a Null-Ratio Measurement System," J. Opt. Soc. Am. 47, 306-306 (1957)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-47-4-306


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