A Microphotometer Digital Readout System

  • Robert E. Mason


In optical emission spectrography, the measurement of photographic response is usually made with the aid of a line scanning microphotometer. Many of the older nonrecording instruments use an optically projected galvanometer or microammeter scale as a readout device. Another readout system in use is a servo-balancing potentiometer coupled to a mechanical counter. Both these systems are electromechanical in nature and certain component parts are subject to wear, which can show up as a decrease in the slope of the emulsion calibration curve over a period of time.


Operational Amplifier Memory Unit Switch Circuit Readout System Memory Circuit 
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  1. 1.
    Applications Manual for Operational Amplifiers (Philbrick/ Nexus Research, Dedham, Mass., 1969), 2nd ed., p. 88.Google Scholar

Copyright information

© Springer Science+Business Media New York 1974

Authors and Affiliations

  • Robert E. Mason
    • 1
  1. 1.Divison of SCM CorporationCeramics Group, Glidden-DurkeeBaltimoreUSA

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