Fire Detection Algorithms Using Multimodal ... - Bilkent University
Fire Detection Algorithms Using Multimodal ... - Bilkent University Fire Detection Algorithms Using Multimodal ... - Bilkent University
CHAPTER 5. FLAME DETECTION USING PIR SENSORS 719000Flicker Frequency Distribution800070006000Abs. DFT coef.500040003000200010000−25 −20 −15 −10 −5 0 5 10 15 20 25Frequency (Hz)Figure 5.2: Flame flicker spectrum distribution. PIR signal is sampled with 50Hz.
CHAPTER 5. FLAME DETECTION USING PIR SENSORS 72Figure 5.3: A typical PIR sensor output sampled at 50 Hz with 8 bit quantizationwhen there is no activity within its viewing range.
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CHAPTER 5. FLAME DETECTION USING PIR SENSORS 719000Flicker Frequency Distribution800070006000Abs. DFT coef.500040003000200010000−25 −20 −15 −10 −5 0 5 10 15 20 25Frequency (Hz)Figure 5.2: Flame flicker spectrum distribution. PIR signal is sampled with 50Hz.
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