Title :
A high-sensitivity particle monitor using an integration sphere
Author :
Yamaguchi, Tomuo ; Watanabe, Kenzo ; Nakayama, Masakatsu ; Gao, Yi-Zhu ; Nagasawa, Tadashi ; Ozawa, Taiyo
Author_Institution :
Res. Inst. of Electron., Shizuoka Univ., Japan
Abstract :
A particle monitor is developed for real-time measurement of dust concentration in living and working environments. The principle is based on the optical scattering method and an integration sphere is used to collect the scattered light onto a photo-detector. A double-modulated laser and a low-noise current-to-voltage converter followed by a synchronous demodulator for averaging are also used for an optical source and detector, respectively, to enhance the signal-to-noise ratio. A prototype monitor demonstrates that the dust concentration as low as 5 μg/m3 is detectable with these techniques
Keywords :
air pollution measurement; computerised monitoring; dust; light scattering; measurement by laser beam; optical sensors; signal processing equipment; double-modulated laser; dust concentration; integration sphere; living and working environment; low-noise current-to-voltage converter; optical detector; optical scattering; optical source; particle monitor; prototype monitor; real-time measurement; signal-to-noise ratio; synchronous demodulator; working environment; Earth; Laser beams; Light scattering; Monitoring; Optical filters; Optical scattering; Optical sensors; Optical signal processing; Particle scattering; Pollution measurement;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 1999. IMTC/99. Proceedings of the 16th IEEE
Conference_Location :
Venice
Print_ISBN :
0-7803-5276-9
DOI :
10.1109/IMTC.1999.776787
