Record Display for the EPA National Library Catalog


Main Title Final report passive IR SO2 sensor,
Author Lepper, James M.
CORP Author Dalmo Victor Co., Belmont, Calif.
Publisher Dalmo Victor
Year Published 1967
Report Number R-3253-4589; PH-86-66-155
Stock Number PB-187 390
OCLC Number 16521727
Subjects Remote sensing ; Air--Pollution--Measurement ; Gases--Analysis
Additional Subjects ( Air pollution ; Sensors) ; ( Waste gases ; Gas analysis) ; ( Infrared spectroscopy ; Gas analysis) ; ( Radiometers ; Infrared equipment) ; Smokes ; Bolometers ; Passive ; Quantitative analysis ; Sulfur compounds ; Dioxides ; Sulfur dioxide
Library Call Number Additional Info Location Last
ERAM  TD890.L42 Region 9 Library/San Francisco,CA 04/05/1991
NTIS  PB-187 390 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 1 v. (various pagings) illus. 28 cm.
A remote operating Passive Infrared SO2 Sensor was developed. A system of quantitative measurement for field operation was created with simplicity of operation and minimum of interference as objectives. The complexities of the radiative process limit accuracies relative to laboratory measurements, but were overcome to the degree that meaningful and practical measurements are made in the field without further calculation. While there are limits to the environmental compensation and rejection, no other existing means approaches these limits to the degree of this Passive Infrared SO2 Sensor. The instrument is a four color radiometer with an orthogonalized ratio computer which computes the ratio of SO2 radiation at 8.7 microns to the CO2 radiation at 9.4 microns. The spectral overlap for each of four signals is stored in the sensor's computer. The mixed signals (four component vectors) from the four signal channels are separated (orthogonalized) by summing appropriate amounts of each channel (vector coordinate transformation). Two of the separated signals (perpendicular vectors) go to a phase detector which generates a function of the two components as the arctangent (the vector sum angle) of the component ratio. The ratio function is separated from the arctangent function by the non-linear scale of the panel meter. (Author)
"Reproduced by National Technical Information Service, Springfield, Va." PB-187390.