Introduction and Historical Context

• Guest video from James Tingley (Atomic Frontier channel)
• BBC documentary style presentation from Australia
• Historical fire detection: lookout trees used since 1930s in Western Australia
• Dave Evans Bicentennial Tree: 65 meters tall, tallest treehouse in world
  • Provides 20 kilometer visibility range in all directions
• Need satellite technology to monitor continent-sized areas

Geostationary Satellite Monitoring

• Japan's Hamari weather satellite in geostationary orbit
  • 36,000 kilometers altitude, directly above equator
  • 24-hour rotation matches Earth's rotation
  • Takes photograph every 10 minutes
• Black Summer fires (June 2019 - May 2020):
  • 18 million hectares burned
  • 34 people killed
  • 4+ billion terrestrial vertebrates perished
• Limitation: smoke visible only after fires too large to control effectively

Low Earth Orbit CubeSat Technology

• Improved resolution by dropping from geostationary to low Earth orbit
• Trade-off: need multiple satellites for continuous coverage
• Cost comparison: traditional weather satellites cost $290 million each
• CubeSats: can launch 4,000 for same price as one weather satellite
• Originally for low-cost research, now industry-ready after 15+ years development
• Curtin University (Western Australia) CubeSat: 4-meter resolution capability

Fire Detection Methods

Visual Detection

• Flames appear red, simple red filter can identify targets
• Problem: many false positives from red non-fire objects
• Solution: fires flicker at characteristic 12 Hz frequency
• Combined red color + 12 Hz flicker = accurate fire detection

Infrared Detection

• Fires produce more infrared than visible light
• Longer wavelength passes through smoke unaffected
• Can detect and track large blazes through smoke
• Limitation: low resolution misses small spot fires
• Spot fires important as precursors to larger blazes

Potassium Emission Detection

• Demonstration with ethanol flames:
  • Pure ethanol: clear, slightly orange-red flame
  • Boric acid: bright green flame (specific electron wavelengths)
  • Potassium chloride: dim purple visible flame
• Trees contain potassium for cell metabolism
• Potassium produces 717 nanometer infrared wavelength during combustion
• 717nm emission only occurs during active combustion
• Bright emission allows detection of sub-pixel fires
• Specific wavelength tuning ensures signal from active blazes

Future of Fire Detection

• Evolution from traditional lookout trees to satellite technology
• Fleet of low-cost satellites with specific wavelength filters
• Capability to detect fires at ignition and track through smoke development
• Lookout trees still valuable for spectacular forest views