Analyzing Sensitivity Characteristics according to Decrease in Intensity of Light from LED Light Source of Photoelectric Spot-Type Detector

After the revision of “Fire Safety Standards for Automatic Fire Alarm System and Visual Equipment (NFSC 203)” in 2015 made it mandatory to install smoke detectors apartments medical facilities, their number has increased significantly. The detector used experiment was a photoelectric spot-type analog detector. conducted by configuring real-time monitoring system. In addition, sensitivity characteristics according decrease intensity light were analyzed. This achieved controlling related lifespan LED, vital component When LED decreased 10%, 12.5%. 30%, 61% value. From these results, An equation change derived. It confirmed that when decreases, decreases about 37% more than intensity. Therefore, developing detector, establishing current-radiation characteristic curve correlation between current source ambient temperature will significantly improve product's function post-management.