抄録
Nitrogen dioxide (NO2) gas generated by indoor fires significantly impacts human health. Since smokeless
fires might not be detected by fire alarms, we propose an LED sensor that measures the spatial mean
concentration of NO2 by a differential optical absorption spectroscopy (DOAS) technique and developed
a prototype LED sensor using LEDs whose center wavelengths are 392.4 and 624.0 nm. A linear regression
between LED and commercial NO2 sensors at concentrations between 0 and 100 ppm with a 21-cm
distance showed an R 2 value of 0.93 and statistical error of 8.7%, indicating reasonable agreement.
