ABSTRACT
The selection of the measurement base for underground mines Ventilation regimes control includes the choice of the devices for measuring of the velocities and airgas flow rates. The resolution of this task is rather difficult. The tachometric sensors, traditionally used in many countries (Grate Leonardo’s invention) have big number of disadvantages: low sensitivity, high inertia, impossibility to cover necessary measurement range. Presence of movable accumulating error parts, vulnerability to dust affect and others. The usage of the tachometric anemometers in spite of the named above disadvantages confirms the difficulty of the modern technical level anemometer creation. About hundred years the attempts to create thermoanem-ometers continue, somewhere successfully, but not in mining. There are some very deep physical reasons of very slow progress in this two directions. The present report is devoted to the new acoustic devices elaborated in Moscow State Mining University. Acoustics anemometers are free of all named above disadvantages: unsurpassed sensitivity, time lag freedom, big range for velocity and flow rate measurements. They do not contain movable parts, sensitive to the direction of the stream and not sensitive to the coal dust.
