Multispectral Mid-Infrared Camera System for Accurate Stand-Off Temperature and Column Density Measurements on Flames.
Sensors (Basel)
; 21(24)2021 Dec 16.
Article
en En
| MEDLINE
| ID: mdl-34960488
ABSTRACT
Accurate measurement of temperature in flames is a challenging problem that has been successfully addressed by hyperspectral imaging. This technique is able to provide maps of not only temperature T (K) but also of column density Q (ppm·m) of the main chemical species. Industrial applications, however, require cheaper instrumentation and faster and simpler data analysis. In this work, the feasibility and performance of multispectral imaging for the retrieval of T and QCO2 in flames are studied. Both the hyperspectral and multispectral measurement methods are described and applied to a standard flame, with known T and QCO2, and to an ordinary Bunsen flame. Hyperspectral results, based on emission spectra with 0.5 cm-1 resolution, were found in previous works to be highly accurate, and are thus considered as the ground truth to compare with multispectral measurements of a mid-IR camera (3 to 5 µm) with a six interference filter wheel. Maps of T and Q obtained by both methods show that, for regions with T â³1300 K, the average of relative errors in multispectral measurements is â¼5% for T (and can be reduced to â¼2.5% with a correction based on a linear regression) and â¼20% for Q. Results obtained with four filters are very similar; results with two filters are also similar for T but worse for Q.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Idioma:
En
Revista:
Sensors (Basel)
Año:
2021
Tipo del documento:
Article
País de afiliación:
España