211 - Fire Fundamentals pt. 17 - Detecting fires

Fire Science Show

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In episode 17 of the Fire Fundamentals, we delve into the fire detection technology. Fire detection forms the critical foundation of all active fire protection measures, serving as the prerequisite for any fire safety engineering solution to work effectively. Following key points are discussed:

Detection systems must balance sensitivity with reliability to avoid false alarms that disrupt building operations
False alarms lead to serious business continuity issues and may eventually cause systems to be disabled
Test fires methodology to assess sensor viability is discussed
Optical smoke detectors use light scattering principles to detect smoke particles in their detection chamber
Ionisation detectors utilise a small radioactive source creating an ionised environment in which an electrical current can be present, and gets disrupted by smoke
Heat detectors operate based on absolute temperature thresholds or rate-of-rise measurements
CO sensors complement other detection technologies to improve reliability and reduce false alarms
Line detectors (both optical and heat-based) provide coverage for large areas like atria and tunnels
Aspirating detection systems offer extremely early warning by continuously sampling air through pipes
Future technologies include camera-based detection with AI processing and thermal imaging
Strategies to reduce false alarms include multi-sensor devices, coincidence detection, and verification delays

Without detection, we're blind, and no automated systems may act—making fire detection critical for whatever application of fire safety engineering we implement.
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Chapters

1. Introduction to Fire Detection (00:00:00)

2. Why False Alarms Matter (00:04:39)

3. Optical Smoke Sensors Technology (00:09:24)

4. Heat and Ionization Detectors (00:18:39)

5. Flame Sensors and Line Detectors (00:28:12)

6. Aspirating Systems and Future Technologies (00:39:38)

7. Methods to Reduce False Alarms (00:48:22)

230 episodes

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