Infrared gas-filter correlation instrument for in situ measurement of gaseous pollutant concentrations
Abstract
An ir analyzer employing gas-filter correlation techniques has been designed and constructed to measure the concentrations of CO, NO, SO2, HCl, and HF in the stacks or ducts of stationary pollutant sources. Use of a retroreflector allows the stack to be double passed, and no sample is extracted. For each gas, small interchangeable fixed-position grating polychromators are used as narrow multiband spectral filters with the bands corresponding to locations of selected absorption lines. The approximate useful ranges (in parts per million-meters) over which this analyzer operates are 10-4000 for NO, 10-1500 for CO, 50-40,000 for SO2, 10-2000 for HCl, and 5-200 for HF. The discrimination against other gases and particulates is excellent. The analyzer has been tested in the laboratory and on a variety of pollutant sources.
- Publication:
-
Applied Optics
- Pub Date:
- May 1976
- DOI:
- 10.1364/AO.15.001222
- Bibcode:
- 1976ApOpt..15.1222H
- Keywords:
-
- Air Pollution;
- Bandpass Filters;
- Gas Analysis;
- Gas Composition;
- Infrared Instruments;
- Pollution Monitoring;
- Carbon Monoxide;
- Design Analysis;
- Exhaust Gases;
- Hydrochloric Acid;
- Hydrofluoric Acid;
- Nitrogen Oxides;
- Optical Measuring Instruments;
- Particulates;
- Performance Tests;
- Sulfur Dioxides;
- Instrumentation and Photography;
- POLLUTION;
- REMOTE SENSING;
- INFRARED;
- SPECTROMETERS