An examination of enhanced atmospheric methane detection methods for predicting performance of a novel multiband uncooled radiometer imager

Webber, Cody M.; Kerekes, John P.

To evaluate the potential for a new uncooled infrared radiometer imager to detect enhanced atmospheric levels of methane, three different analysis methods were examined. A single-pixel brightness temperature to noise-equivalent delta temperature (NEdT) comparison study performed using data simulated from MODTRAN6 revealed that a single thermal band centered on the 7.68 inline-formulaµm methane feature leads to a detectable brightness temperature difference exceeding the sensor noise level for a plume of about 17 ppm at ambient atmospheric temperature compared to an ambient plume with no enhanced methane present. Application of a normalized differential methane index method, a novel approach for methane detection, demonstrated how a simple two-band method can be utilized to detect a plume of methane that is 10 ppm above ambient atmospheric concentration and inline-formula−10 K from ambient atmospheric temperature with an inline-formula80 % hit rate and inline-formula17 % false alarm rate. This method was capable of detecting methane with similar levels of success as the third method, a proven multichannel method, matched filter. The matched-filter approach was performed with six spectral channels. Results from these examinations suggest that given a high enough concentration and temperature contrast, a multispectral system with a single band allocated to a methane absorption feature can detect enhanced levels of methane.

Zitieren

Zitierform:

Webber, Cody M. / Kerekes, John P.: An examination of enhanced atmospheric methane detection methods for predicting performance of a novel multiband uncooled radiometer imager. 2020. Copernicus Publications.

Zugriffsstatistik

Gesamt:
Volltextzugriffe:
Metadatenansicht:
12 Monate:
Volltextzugriffe:
Metadatenansicht:

Grafik öffnen

Rechte

Rechteinhaber: Cody M. Webber

Nutzung und Vervielfältigung:

Export