Abstract

A filter photometer for the continuous determination of a single component of a gaseous mixture is described. The instrument incorporates a combination of band pass and long wavelength pass filters of the interference type, designed to transmit in the near infrared. The analyzer has been calibrated to determine hydrocarbons in automotive exhaust by means of absorbance measurements at 3.43 microns.

© 1956 Optical Society of America

Infrared Transmission of Synthetic Atmospheres.* I. Instrumentation

J. N. Howard, D. E. Burch, and Dudley Williams
J. Opt. Soc. Am. 46(3) 186-190 (1956)

Recording Night Sky Photometer of High Spectral Purity

R. B. Dunn and E. R. Manring
J. Opt. Soc. Am. 46(8) 572-577 (1956)

New Variable Thickness Infrared Cell and the Infrared Spectra of HF, DF, H₂O, and D₂O†

Richard M. Adams and J. J. Katz
J. Opt. Soc. Am. 46(10) 895-898 (1956)

Interferometric Frequency Calibration of Infrared Spectrometers

Svend Brodersen
J. Opt. Soc. Am. 46(4) 255-258 (1956)

Infrared Transmission of Synthetic Atmospheres.* IV. Application of Theoretical Band Models

J. N. Howard, D. E. Burch, and Dudley Williams
J. Opt. Soc. Am. 46(5) 334-338 (1956)