Which detector is described as looking for specific portions of the visible and invisible light spectrum produced by flames, sparks, or embers?

Which detector is described as looking for specific portions of the visible and invisible light spectrum produced by flames, sparks, or embers?

• A. Radiant Energy Detector
• B. Ionization Smoke Detector
• C. Photoelectric Smoke Detector
• D. Beam Detector

Answer: (A)

Flame energy is emitted as radiant energy across parts of the visible and infrared spectrum. A radiant energy detector is designed to sense those wavelengths directly from the flame, allowing it to detect fire quickly based on the light and heat the flame emits, even before much smoke forms. This makes it the right match for detecting flames, sparks, or embers by their spectral radiation. In contrast, smoke detectors like ionization or photoelectric respond to smoke particles rather than flame light, and beam detectors monitor whether a light beam is broken by smoke in a corridor, not the flame’s spectral emissions.

Flame energy is emitted as radiant energy across parts of the visible and infrared spectrum. A radiant energy detector is designed to sense those wavelengths directly from the flame, allowing it to detect fire quickly based on the light and heat the flame emits, even before much smoke forms. This makes it the right match for detecting flames, sparks, or embers by their spectral radiation. In contrast, smoke detectors like ionization or photoelectric respond to smoke particles rather than flame light, and beam detectors monitor whether a light beam is broken by smoke in a corridor, not the flame’s spectral emissions.