Probe for measuring the angular velocity of rotational vibrations in mining excavations, in the atmosphere endangered by the explosion of methane or coal dust

摘要

The probe for measuring the angular speed of rotational vibration in mining excavations, in an atmosphere threatened by methane or carbon dust shall be characterised by having three pairs of low frequency geophones (6) for measuring the angular speed of rotational vibrations in three directions X, Y, Z, connected to the printed circuit board (4),on which there are three galvanically separated measuring circuits for each component separately, comprising, on the side of the transmission line inlet, diode voltage limitation and anti-polarisation protection assemblies,and a system of amplitude-frequency geometry compensation (6),filters and transmitter system for the transmission of signals by teletechnical lines in current form.