Robotic mining equipment plays an increasingly important role in the coal mining industry. Due to the complexity of the confined underground environment, available localization methods are limited, and restrict the development of coal mine robots (CMRs). Ultra-wideband (UWB) is a promising positioning sensor with high ranging accuracy. …
Wireless sensor networks (WSNs) are a specific type of networks that link sensors and have the potential to greatly benefit monitoring of coal mine applications, underground mine safety and localization of miners. Such systems can monitor the underground environment in real-time, provide information about the localization of …
Zhao et al. designed a displacement sensor using a fiber optic grating technology, which could be used to monitor tunnel roof displacement in coal mines. Zhou et al. [ 18 ] developed an active fiber optic gas sensor to monitor the concentration of a specific gas, which is ideal for detecting explosive or corrosive gases in some practical ...
The prepared ZnO nanorod sensor was tested for coal mine gas detection. The advantage of our approach is achieving fast nanorods growth at low temperature …
The software architecture adopts ZigBee protocol stack. The research shows that the proposed ZigBee wireless sensor network based coal mine underground gas monitoring system can help improve the real-time monitoring level and reduce safety risks in the complex and special environment of coal mine underground.
The maximum number of CH 4 sensors used at a mine was 20 and the minimum number was 1. The percentages of O 2 and smoke sensors used in mines, 6 percent and 2 percent, respectively, are comparable to the results from the 2003 survey, where less than 10 percent of the mines used O 2 and smoke sensors. From the current survey, air …
The fiber Bragg grating (FBG) strain sensors were used for on-line monitoring of the stress variation of the lined wall in the gateway retained along the goaf of No. 3203 coal mining face in Dongtan Mine. The results showed that the FBG strain sensor with the wide measuring range could measure the stress variation accurately during the support …
The Conspec smoke sensor (S3) is an ionization-type smoke sensor which is also approved by MSHA for use in U. S. underground coal mines. This sensor uses a source of Americium 241 to ionize the air space between two electrodes.
In the past decade, gas sensors based on tunable diode laser absorption spectroscopy (TDLAS) have been extensively studied and tailored for use in the coal mine industry because of their...
Why were canaries used in mines? Mines, especially coal mines, can be dangerous environments due to the presence of natural gases such as carbon monoxide, methane, and sulfur dioxide. ... Modern mines now rely on advanced gas detection systems, which use sensors and alarms to alert workers to the presence of dangerous …
The sensors recording the measurements are placed at various locations around the coal mine. The map of the coal mine area of interest is presented in Fig. 1. Download: Download high-res image (375KB) Download: Download full-size image; Fig. 1. Coal mine area map containing sensor locations.
Sensors and monitoring systems for mining applications. Sensor-based detection and monitoring solutions for the mining industry include: Sensors to measure and monitor …
Coal mining refers to the process of extracting coal from the ground. Since the 1880s, coal has been extracted due to its energy content has been widely used to generate electricity. For example, steel and cement industries use coal as a fuel for extraction of iron and for cement production.
Each sensor used has a threshold value that, if that value is exceeded, it causes the buzzer to activate, signaling the miners and supervisors. Wi-Fi and ThingSpeak is used for the remote transmission of information from coal mine to a central location. This technology may improve the safety and scale back accidents within the coal mines.
Vibrating wire-based geotechnical sensors are widely used for stress measurement of strata in underground coal mines. These types of sensors have several advantages over other geotechnical sensors. However, the measurements from these sensors are taken in-situ using conventional readout unit manually till date even in the …
The sensor is made of steel armored cable and can be used in underground coal mines. Fig. 2. FBG temperature sensor for high voltage application. Fig. 3. FBG temperature sensor for mining ...
The coal mine fire leads to gradual increase in temperature; therefore, detection of temperature change in underground coal mines is an important concern. For this multiple fiber Bragg grating (FBG) sensors can be used for detecting deviation in temperature in underground coal mines to detect the coal mine fire before its combustion.
The detection limit or resolution of the QTF based methane sensor is 0.025%, which is satisfactory for methane monitoring in coal mines. The atmosphere in ventilated coal mine areas mainly contains nitrogen (N 2), oxygen (O 2), water vapor, and CO 2. Major gases which concern workers in a coal mine include carbon monoxide …
Additionally, open-pit coal mining contributes to elevated PM levels, ... Among the commonly used sensors for detecting dust, smoke, and particles is the Dust Sensor, capable of detecting tiny ...
In the past decade, gas sensors based on tunable diode laser absorption spectroscopy (TDLAS) have been extensively studied and tailored for use in the coal …
The use of sensors designed for gas detection in mines has developed from the miner's canary to infrared sensors. A Miner's Canary The canary (Serinus canaria) was commonly used by miners to alert them of the presence of toxic vapors such as the odorless carbon monoxide in hazardous areas of underground mining pits.
The key elements that affect coal mine safety risk accidents are obtained through quantitative research on the characteristic indicators of the complex network …
Environment monitoring is important for the safety of underground coal mine production, and it is also an important application of Wireless Sensor Networks (WSNs). We put forward an integrated environment monitoring system for underground coal mine, which uses the existing Cable Monitoring System (CMS) as the main body and the WSN …
A wireless sensor network used at coal faces to acquire sensor data is designed. Based on the characteristics of coal faces, a special topology of the wireless sensor network is adopted, which ...
The compensated sensors basically satisfy the gas detection requirements of ground-based instruments. However, since the coal mine temperature is greatly affected by the change of seasons, gas sensors are still of notable deviations in detection, failing to meet the requirements for quantitative analysis on hazardous gases in coal mines.
Wireless sensor networks (WSNs) are a specific type of networks that link sensors and have the potential to greatly benefit monitoring of coal mine applications, …
sensors and are feasible to use in underground coal mines. 2.4.1 Capacitive humidity sensor It consists of a hygroscopic dielectric material sandwiched between a pair of electrodes forming
A multi-sensor system [22,62,125] uses a combination of sensors, such as cameras, radar, LIDAR, and proximity sensors to collect information about the environment around the mobile mining machines and allowing miners to more easily detect potential hazards. 3D mapping [87,94,125] can be used to create accurate models of the …
The strong odour of hydrogen sulfide can be detected by smell concentrations as low as 1ppm; however, as an alert system, this is an extremely unreliable method and should not be used. Hydrogen Sulfide can be measured using a gas detector fitted with electrochemical sensors or by using indicator stain tubes.Electrochemical …
Wireless Sensor Network (WSN) explores the use of the latest WSN technology in coal mine safety intelligent wireless monitoring, especially the three key techno.
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نشانی: شماره 1688، جاده شرقی گاوک، منطقه جدید پودونگ، شانگهای، چین.
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