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Effects of obstructions, sample size and sample rate on ultrasonic anemometer measurements underground.

Authors
Martikainen-AL; Taylor-CD; Mazzella-AL
Source
2011 SME Annual Meeting, February 27 - March 2, Denver, Colorado, Preprint 11-010. Englewood, CO: Society of Mining, Metallurgy, and Exploration, Inc., 2011 Feb; :1-5
Link
NIOSHTIC No.
20038494
Abstract
In fluctuating airflow, continuous air velocity recording is the most reliable method of air velocity measurement. It allows for fast recognition of changes and the calculation of long-term averages. Also, it enables the mine operator to identify when the airflow has decreased to a point requiring action. Using ultrasonic anemometers provides an accurate option for continuous air velocity monitoring. This paper provides information about the effect of common obstructions in underground mining on air velocity readings. Stationary and moving obstructions are used to represent workers and equipment that would cause discrepancies in measured airflow. Also, it is important to know how large of a sample size is required to ensure reasonable accuracy of results. Statistical analysis is used to evaluate the required sample size. The sampling procedure is further studied by comparing two different sample rates. The results show that obstructions provide noticeable differences in air velocity measurements. Also, movement of obstructions can be recognized from changes in results. Surprisingly small sample sizes provide reliable air velocity information. Standard sample rates are found to be suitable for the underground environment.
Keywords
Air-flow; Air-monitoring; Sampling; Monitoring-systems; Mining-industry; Underground-mining; Ventilation; Ventilation-systems
Publication Date
20110227
Document Type
Conference/Symposia Proceedings
Fiscal Year
2011
NTIS Accession No.
NTIS Price
NIOSH Division
OMSHR
Priority Area
Mining
Source Name
2011 SME Annual Meeting, February 27 - March 2, Denver, Colorado, Preprint 11-010
State
CO; PA
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