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Applied Spectroscopy

Applied Spectroscopy

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  • Vol. 22, Iss. 5 — Sep. 1, 1968
  • pp: 578–581

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

K. E. Stine and R. A. Weagant

Applied Spectroscopy, Vol. 22, Issue 5, pp. 578-581 (1968)


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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.

Citation
K. E. Stine and R. A. Weagant, "High Photometric Accuracy in an Optical Null, Double-Beam Infrared Spectrophotometer," Appl. Spectrosc. 22, 578-581 (1968)
http://www.opticsinfobase.org/as/abstract.cfm?URI=as-22-5-578

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