This document discusses different types of fire alarm detectors, including:
- Optical smoke detectors that detect smoke particles scattering a light beam.
- Ionization smoke detectors that detect changes in air ionization from smoke particles.
- Heat detectors that trigger when one thermistor is exposed to higher temperatures than another reference thermistor.
- Flame detectors that are sensitive to infrared or ultraviolet radiation from flames.
- Linear heat detectors that can detect heat along their entire length to protect large areas.
- Distributed temperature sensing uses fiber optic cables to continuously monitor temperature along their length and pinpoint the location of fires.