Results 21 to 30 of about 36,939 (247)
A novel chopping current protection circuit for intrinsically safe power supply
Gong-kuang zidonghua, 2016 For problems that traditional chopping current protection circuit had small cut-off current value and poor anti load impact ability, and needed additional recovery circuit or manual circuit after over-current fault, a novel chopping current protection ...
FANG Xupeng +4 more
doaj +1 more source
Development of data acquisition instrument for coal and gas outburst based on wireless communication
Meikuang Anquan, 2022 Aiming at the problem of long measuring time and low efficiency of K1 value measuring instrument for drilling cuttings gas desorption index used in coal mine at present, based on the related requirements of prevention and control of coal and gas ...
WANG Yanbin
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, 2017 In view of poor real-time performance and complex wiring existed in traditional operating condition monitoring of coal mine mechanical and electrical equipment, a mine-used intrinsically safe equipment monitoring substation based on wireless ...
DU Yan +7 more
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Audio and Video System for Mine Search and Rescue Robot Based on Linux
Meikuang Anquan, 2020 The audio and video system of mine search and rescue robot is designed based on the Linux. The system selects a 1/2.7 inch CMOS USB binocular camera, BH1750 light intensity acquisition and 850 nm infrared compensation light as the video acquisition ...
LI Wenfeng, BAI Juntao
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Fiber-optic sensors : applications and advances [PDF]
, 2005 Even before fiber optics made it big in the telecom industry, the technology was showing promise in the fields of industrial and environmental sensing.
Culshaw, Brian
core +2 more sources
High-Speed Communications Over Polymer Optical Fibers for In-Building Cabling and Home Networking [PDF]
, 2010 This paper focuses on high-speed cabling using polymer optical fibers (POF) in home networking. In particular, we report about the results obtained in the POF-ALL European Project, which is relevant to the Sixth Framework Program, and after two years of ...
Abrate, S. +5 more
core +1 more source
Design and Performance Analysis of an Intrinsically Safe Ultrasonic Ranging Sensor
Sensors, 2016 In flammable or explosive environments, an ultrasonic sensor for distance measurement poses an important engineering safety challenge, because the driving circuit uses an intermediate frequency transformer as an impedance transformation element, in which
Hongjuan Zhang +4 more
doaj +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
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Scientific Reports, 2023 We have developed a radioluminescence-based survey meter for use in industries in which there is involvement in naturally occurring radioactive material (NORM), also in support of those needing to detect other weak emitters of radiation.
H. T. Zubair +13 more
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