Flame detectors detect which pair of wavelengths?

Flame detectors detect which pair of wavelengths?

• A. Ultra-violet / infrared
• B. Visible / ultraviolet
• C. Infrared / microwave
• D. X-ray / ultraviolet

Answer: (A)

Flame detectors rely on sensing the radiation that flames emit. Flames produce strong ultraviolet energy from excited chemical species and also radiate in the infrared due to their heat. Detecting both ultraviolet and infrared light gives a fast and reliable signal of a flame across different fuels and conditions, and it helps distinguish flame signatures from ordinary lighting or background noise. The other wavelength options aren’t as practical for fire detection: visible light is easily overwhelmed by sunlight, infrared alone can be less distinctive in some environments, and microwaves or X-rays aren’t used for typical fire sensing.

Flame detectors rely on sensing the radiation that flames emit. Flames produce strong ultraviolet energy from excited chemical species and also radiate in the infrared due to their heat. Detecting both ultraviolet and infrared light gives a fast and reliable signal of a flame across different fuels and conditions, and it helps distinguish flame signatures from ordinary lighting or background noise. The other wavelength options aren’t as practical for fire detection: visible light is easily overwhelmed by sunlight, infrared alone can be less distinctive in some environments, and microwaves or X-rays aren’t used for typical fire sensing.