Fig. 1. Light scattering of optical particle measurement instruments
Fig. 2. Spectrum of optical particle measurement instruments (SENTRY Dust Monitor) for particle detection
Fig. 3. Simulation of the sampling air velocity in the optical chamber
Fig. 4. Optical chamber to which the C type has been applied
Fig. 5. Beam stopper: conical and oblique types
Fig. 6. Optical chamber to which the C type and the conical beam stopper have been applied
Fig. 7. Circuit diagram for PID control
Fig. 8. Main control board for multi-channel
Fig. 9. Optical chamber developed in this study
Fig. 10. Experimental set-up for calibration and performance evaluation of a SENTRY Dust Monitor
Fig. 11. Experimental set-up for a field test
Fig. 12. Comparison of PM concentration between the 8 ch. and 16 ch. SENTRY Dust Monitors and the Grimm Dust Monitor
Fig. 13. Performance evaluation of the 16 ch. SENTRY Dust Monitor compared with the Grimm Dust Monitor
Fig. 14. Performance evaluation of the 16 ch. SENTRY Dust Monitor compared with the Grimm Dust Monitor under the hi-concentration condition
Fig. 15. Comparison of PM10 and PM2.5 between a SENTRY Dust Monitor and a beta ray gauge
Table 1. Design parameters in the optical chamber
Table 2. Cut-off diameter. for each channel
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