Tham khảo tài liệu 'photodiodes communications bio sensings measurements and high energy part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | A Photodiode-Based Low-Cost Telemetric- Lidar for the Continuous Monitoring of Urban Particulate Matter 131 continuous monitoring of the laser power. This data was stored together with the other LIDAR data and was used for the normalization of the LIDAR data . In the case of a laser failure an E-mail message was automatically sent to IFAC. On-board meteorological sensors for wind relative humidity and temperature completed the instrumentation. Meteorological data were managed and stored together with the other data. All data were sent via FTP to IFAC at the end of each day. Fig. 12. The instrument opened left and installed on the roof of the ARPAT PM-monitoring station in Florence I right This prototype was installed in 2006 on the roof of an ARPAT station Via Ponte alle Mosse Florence Italy where it was in operation until the end of 2007. The instrument operated on a 45 slant above the horizon for a fixed measurement distance of 8 1 meters. ARP AT provided daily gravimetric PM10 data. In a time series of one month of telemetricLIDAR data is compared with gravimetric PM10 data. The upper plot shows the LIDAR calibrated signal averaged over 10 minutes. The PM10 daily gravimetric data are shown as LIDAR-derived 10 min average PM1Ũ . Fig. 13. PM10 as derived from the telemetric-LIDAR and from gravimetric data. 132 Photodiodes - Communications Bio-Sensings Measurements and High-Energy Physics symbols. The ARPAT monitoring station collected PM10 and alternatively for 15day periods. Black stars indicate genuine PM10 measurements while green stars indicate PM10 values calculated from data by applying a constant empirical factor of as suggested by ARPAT. Until December 14 the diurnal cycle of PM related to traffic is evident in the telemetricLIDAR data. During the 14-21 December period northern winds cleaned-up the PBL Planetary Boundary Layer Stull 1988 and prevented the formation of inversion layers thus reducing the PM10 and cancelling its .
