Figure 1 - available via license: Creative Commons Attribution 4.0 International
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(a) Visible/NIR spectrum of a wood-burning fire. The black line indicates the wood fire spectrum and shows strong line emission from potassium near 770 nm. The spectra of two common artificial light sources are shown for comparison. The olive curve shows the spectrum from a highpressure sodium lamp. The light blue curve shows the spectrum of a fluorescent lamp. The fire spectrum was measured with an Ocean Optics Flame S-VIS-NIR-ES spectrometer. (b) Wood-burning fire showing flaming.
Source publication
The severity of wildfires is increasing and has driven increases in nighttime fire activity. Enhanced capability to detect the active burning regions of wildfires at night could significantly improve the effectiveness of wildfire management operations. Potassium line emission in the NIR near 770 nm is a signature of active burning. We test the use...
Contexts in source publication
Context 1
... et al. [13] proposed use of line emission from flaming regions for wildfire detection, specifically a doublet of lines from potassium. Figure 1 shows a spectrum of flaming wood. The flame spectrum is dominated by emission from a doublet from potassium (K) at wavelengths of 766.5 nm and 768.9 nm in the near-infrared (NIR). ...
Context 2
... minimizes the wavelength shift across the camera field of view. The filter bands were chosen to enable discrimination between the spectra of fire and artificial light sources as shown in Figure 1. The band passes of our selected filters are shown in Figure 2. The MidOpt BP735 filter was chosen to provide high transmission at the potassium lines while minimizing the transmission at the 809 nm sodium line produced by high-pressure sodium lamps that are used extensively in street and other outdoor lighting. ...
Context 3
... 2. Transmission curves of the filters selected for VIS/NIR imaging. The filter bands were chosen to enable discrimination between the fire spectrum shown in Figure 1 and artificial light sources. ...
Context 4
... aircraft was flown over Iowa City, Iowa, USA, which provided a variety of artificial lights. A wood-burning fire was set in a 0.9 m diameter fire pit as shown in Figure 1. The wood was mainly Ash. ...
