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Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 22,
  • Issue 5,
  • pp. 578-581
  • (1968)

High Photometric Accuracy in an Optical Null, Double-Beam Infrared Spectrophotometer

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Abstract

To date, optical null infrared spectrophotometers have been capable of double-beam photometric accuracies of no better than 0.5% to 1.0%. When operated in the double-beam mode, optical null instruments measure the transmittance of a sample by optically attenuating the reference beam until its energy equals that of the sample beam. This operation is usually performed automatically by a servosystem which constantly repositions an optical attenuator (comb) in the reference beam to obtain a null balance condition. A pen servosystem then follows the comb movement from a linear potentiometer geared to the comb.

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