Wireless devices UNDERGROUND emergency alarms and tracking the volume fraction of methane in the atmosphere of mining

摘要

device of underground wireless alarm and the volume fraction of methane in the atmosphere u043au043eu043du0442u0440u043eu043bu00a0 mines on the day of the u0440u0445u043du043eu0441u0442u0438 shafts transmit the set of block u0441u043eu0441u0442u043eu00a0u0449u0438u0439 u0444u043eu0440u043cu0438u0440u043eu0432u0430u043du0438u00a0 and an emergency signal, transmitter and transmitting antenna with the ground connected thereto u043bu00a0u043cu0438 at ends and located underground foster kitseach of which consists of a receiving antenna, is connected through an amplifier to the block of signal processing, including u0441u0435u0431u00a0 selective amplifier, decoder, p u0440u0435u043eu0431u0440u0430u0437u043eu0432u0430u0442u0435u043bu044c speech, low-frequency amplifier and loudspeaker, u043eu0442u043bu0438u0447u0430u044eu0449u0438u0435u0441u00a0 so that, with a view to u0440u0430u0441u0448u0438u0440u0435u043du0438u00a0 functionalitieseach receiver is completed by portable silo safety methane containing methane sensor connected with the alarm and meter u043au043eu043du0446u0435u043du0442 the radio of methane.