VERSATILE GAS FILTER CORRELATION SPECTROMETER

A versatile infrared analyzer employing gas-filter correlation techniques has been designed and constructed to measure concentrations of pollutant gases from a variety of sources. The spectral bandpass is determined by an adjustable grating assembly. By interchanging cell windows, radiant energy sources, gratings, interference filters, and detectors, nearly any desired spectral bandpass between 0.3 micrometers and 11 micrometers can be obtained. Spectral curves of transmittance can also be scanned. A multiple-pass sample cell provides sample paths between approximately 4 m and 40 m. Shorter sample cells can also be employed. An H2O monitor measures the concentration of H2O in the multiple-pass sample cell and automatically accounts for interference by H2O in the measurement of other gas concentrations. Tests have been performed on the measurement of formaldehyde, vinyl chloride and ammonia. The minimum detectable concentration of formaldehyde in automotive exhaust is approximately 0.05 ppm.

• Corporate Authors:

  Aeronutronic Ford Corporation

  Aeronutronic Division
  Newport Beach, CA  United States 

  Environmental Sciences Research Laboratory

  Research Triangle Pk, NC  United States  27711
• Authors:
  • Burch, D E
  • Gates, F J
  • Gryvnak, D A
  • Pembrook, J D
• Publication Date: 1975

Media Info

• Pagination: 75 p.

Subject/Index Terms

• TRT Terms: Ammonia; Automobiles; Chemical concentration; Correlation analysis; Design; Exhaust gases; Field tests; Filters; Formaldehyde; Gas analysis; Infrared analysis; Infrared spectroscopy; Measuring instruments; Monitoring; Performance evaluations; Sensitivity; Spectrometers; Spectrum analysis; Spectrum analyzers; Water
• Uncontrolled Terms: Design criteria; Monitors; Vinyl chloride
• Subject Areas: Data and Information Technology; Design; Highways; Safety and Human Factors;

Filing Info

• Accession Number: 00136475
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: U-6201 Final Rpt., EPA/600/2-75/024
• Contract Numbers: EPA-68-02-1227
• Files: TRIS
• Created Date: Jul 13 1976 12:00AM