 |
| Titel |
Stack emission monitoring using non-dispersive infrared spectroscopy with an optimized nonlinear absorption cross interference correction algorithm |
| VerfasserIn |
Y. W. Sun, C. Liu, K. L. Chan, P. H. Xie, W. Q. Liu, Y. Zeng, S. M. Wang, S. H. Huang, J. Chen, Y. P. Wang, F. Q. Si |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1867-1381
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 6, no. 8 ; Nr. 6, no. 8 (2013-08-13), S.1993-2005 |
| Datensatznummer |
250085034
|
| Publikation (Nr.) |
 copernicus.org/amt-6-1993-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| In this paper, we present an optimized analysis algorithm
for non-dispersive infrared (NDIR) to in situ monitor stack emissions. The
proposed algorithm simultaneously compensates for nonlinear absorption and
cross interference among different gases. We present a mathematical
derivation for the measurement error caused by variations in interference
coefficients when nonlinear absorption occurs. The proposed algorithm is
derived from a classical one and uses interference functions to quantify
cross interference. The interference functions vary proportionally with the
nonlinear absorption. Thus, interference coefficients among different gases
can be modeled by the interference functions whether gases are characterized
by linear or nonlinear absorption. In this study, the simultaneous analysis
of two components (CO2 and CO) serves as an example for the validation
of the proposed algorithm. The interference functions in this case can be
obtained by least-squares fitting with third-order polynomials. Experiments
show that the results of cross interference correction are improved
significantly by utilizing the fitted interference functions when nonlinear
absorptions occur. The dynamic measurement ranges of CO2 and CO are
improved by about a factor of 1.8 and 3.5, respectively. A commercial
analyzer with high accuracy was used to validate the CO and CO2
measurements derived from the NDIR analyzer prototype in which the new
algorithm was embedded. The comparison of the two analyzers show that the
prototype works well both within the linear and nonlinear ranges. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|