Accession Number:

ADA276982

Title:

Remote Infrared Vapor Detection of Volatile Organic Compounds

Descriptive Note:

Final rept. Oct 1991-Sep 1993

Corporate Author:

EDGEWOOD RESEARCH DEVELOPMENT AND ENGINEERING CENTER ABERDEEN PROVING GROUND MD

Report Date:

1993-09-01

Pagination or Media Count:

41.0

Abstract:

In many open-air monitoring applications of Fourier transform spectrometry FTS, the lack of a valid background reference spectrum limits the ability to perform quantitative measurements. Suppression of the broad band detector envelope overcomes this limitation. Interferogram processing provides a means of suppressing the broad band background, while maintaining the target spectral signatures of interest. A combination of interferogram segment selection, digital filtering, and pattern discrimination techniques achieve the background suppression of the variable broad band detector envelope. The spectral band position, width, and strength of the target vapor determine the parameters that are used for background suppression. Interferogram segment selection depends primarily on spectral band width. Digital filter design requires inputs of spectral band position and width. The pattern discrimination techniques compensate for variation in the spectral band contour with signal strength. The FTS in the laboratory and open-air trials demonstrate the utility of the background suppression approach in environmental monitoring of volatile organic compounds. Fourier transform spectrometry, Digital filtering, Multilinear discriminants.

Subject Categories:

  • Organic Chemistry
  • Physical Chemistry
  • Optics
  • Air Pollution and Control

Distribution Statement:

APPROVED FOR PUBLIC RELEASE