Fiber Optic Linear Heat Detection (LHD) uses one, single passive fiber optic cable as a linear temperature sensor over a length of up to 16 km per channel. The result is a continuous temperature profile along the entire length of the sensor cable, providing gapless monitoring and complete asset coverage. Unlike conventional fire detection systems, fiber optic LHD detects and locates fires quickly and precisely, tracking fire size and spread direction regardless of air currents.