Results 21 to 30 of about 85,011 (253)
Research progress on coal mine laser methane sensor [PDF]
, 2019 This paper discusses the research progress of low-power technology of laser methane sensors for coal mine. On the basis of environment of coal mines, such as ultra-long-distance transmission and high stability, a series of studies have been carried out ...
Grattan, K. T. V. +10 more
core +1 more source
, 2023 Radio wave penetration is currently one of the most effective technical means for detecting geological anomalies. With the increase in width of the working surface, the penetration distance of commercially available detection instruments cannot meet the needs of detecting the working surface over 200m.
Li, Yunbo, Peng, Hongling
openaire +1 more source
Coal mine intelligent information comprehensive carrier network
Gong-kuang zidonghua, 2022 At present, the information carrier network used in coal mine is mainly 100 Megabit, Gigabit and 10 Gigabit mining Ethernet ring network. The time delay and reliability of the network are uncontrollable.
SUN Jiping, CHENG Jiamin
doaj +1 more source
TDLAS Detection of propane and butane gas over the near-infrared wavelength range from 1678nm to 1686nm [PDF]
, 2018 It is important in the petrochemical industry that there are high sensitivity, high accuracy, low-power consumption and intrinsically safe methods for the detection of propane, butane and their gas mixtures, to provide early warning of potential ...
Grattan, K. T. V. +5 more
core +1 more source
Several Methods of Reducing Discharge Energy for Intrinsic Safety Power Supply
Meikuang Anquan, 2020 In order to reduce the discharge spark energy of the intrinsic safety power supply, several measures are proposed in this paper. When the over-current protection occurs, DC-DC or AC-DC module should be turned off as quickly as possible, and the ...
DONG Jianguo, LI Yanmin, ZHOU Xingdong, ZHANG Lei
doaj +1 more source
Design of mine-used power supply with super wide input voltage range
Gong-kuang zidonghua, 2016 For problems of existing mine-used flameproof and intrinsically safe type power supply with multiple input voltage level such as large voltage fluctuation, heavy weight and difficult maintenance, a design scheme of mine-used power supply with super wide ...
LIU Yahui
doaj +1 more source
Design of mine-used intrinsically safe wireless through-the-earth communication system
Gong-kuang zidonghua, 2016 The paper introduced structure and key technologies of mine-used intrinsically safe wireless through-the-earth communication system，and analyzed working principle of the system.
TIAN Xifang +3 more
doaj +1 more source
Transient analysis of surge immunity test for intrinsically safe sensor
Gong-kuang zidonghua, 2018 For problem that it was difficult to achieve evaluation grade A due to a long time reverse gap in DC power port voltage of intrinsically safe sensor in positive surge immunity test, taking a typical mine-used intrinsically safe methane sensor as research
ZHANG Ziliang
doaj +1 more source
Gong-kuang zidonghua, 2020 Most of existing models and methods for research of capacitive circuit spark discharge and high-power intrinsic safety power supply only consider discharge characteristics of energy storage elements during discharge process， and do not consider influence
KANG Qian +3 more
doaj +1 more source
Application of Wi-Fi 6 Technology in Coal Mine
Meikuang Anquan, 2020 The wireless network coverage scheme of Wi-Fi 6 in underground coal mine is designed to solve the problem that 5G communication cannot achieve the whole mine signal coverage in underground coal mine.
ZHANG Jinhao, CHEN Min
doaj +1 more source