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Electronic Phase Null Photometric System of the Series 2000 Infrared Spectrophotometer

  • Charles W. Warren
  • Albert W. Chapple
Conference paper
Part of the Developments in Applied Spectroscopy book series (DAIS, volume 4)

Abstract

A new electronic phase null system has been developed which provides precise measurement of sample-to-reference ratio continuously from fractional to 100% transmittance. The Series 2000 system is based on measurement of the phase angle of algebraically summed sample and reference signals having a 90° phase difference. The system yields high photometric accuracy and reproducibility, even with samples having low infrared transmission. No optical attenuator is used.

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Copyright information

© Chicago Section of the Society for Applied Spectroscopy 1965

Authors and Affiliations

  • Charles W. Warren
    • 1
  • Albert W. Chapple
    • 1
  1. 1.Instruments and Communications, Inc.WiltonUSA

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