Improved light scattering dust monitor.
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, Contract H0377092, 1979 Feb; :1-48
This report describes the development, design, fabrication, and testing of a portable, battery-operated, light scattering monitor for the rapid measurement of the concentration of respirable dust in mining environments. The instrument incorporates state-of-the-art design characteristics and makes use of advanced solid-state components both for light emission as well as for its detection. The use of a pulsed light source combined with synchronous signal detection minimizes drift problems and optimizes the sensitivity of the measurement. Continuous clean-air flow screening of all critical optical surfaces, and optimized optical detection and electronic signal processing design resulted in about a hundredfold decrease of noise and drift with respect to precursor instruments. Equivalent mass concentration measurements as low as 10 micrograms per cubic meter can be routinely performed with time constants of about 2 seconds.
Mining-industry; Underground-mining; Respirable-dust; Monitors; Monitoring-systems
CP; Final Contract Report
NTIS Accession No.
OFR 90-79; Contract-H0377092
U.S. Department of the Interior, Bureau of Mines