Investigation of Hazardous and Noxious Substances (HNS) Spectra Characteristics from In-field Hyperspectral Measurement

Abstract

In this study, we conducted field experiments aimed at acquiring spectra of Hazardous and Noxious Substances (HNS) and examining their variations. Spectral measurements were conducted at an outdoor pool situated in the CEDRE in Brest, France. Hyperspectral cameras equipped with 160 bands covering the range from 400 to 1,000 nm were employed to capture the spectra. To elucidate the spectral characteristics of HNS, we extracted the radiance values of HNS and conducted a quantitative analysis of the spectral patterns. While different behaviors were observed depending on the specific HNS under investigation, overall, the radiance values of HNS spectra at the peak wavelengths exhibited variations in response to wind conditions. For highly volatile HNS such as toluene and xylene, the radiance difference compared to the surrounding seawater increased under the influence of wind, but subsequently decreased beyond a certain wind speed. Conversely, the radiance difference of the condensate decreased as wind speed increased. This demonstrates the utility of quantitative analysis in enhancing our understanding.