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(PDF) Radar Interferometry for safe coal mining in China

The underground coal mines at the study site in Northern China are located quite closely to each other. A radar interferometer is formed by combining the radar echoes received at a pair of

Temperature-insensitive Fabry–Perot interferometer for

2020-3-1  This study proposes an inline temperature-insensitive Fabry–Perot interferometer (TI-FPI) for coal mine microseism sensing based on a cantilever structure. The sensor is fabricated by splicing a section of hollow core photonic crystal fibre (HC-PCF) between a lead-in polarisation-maintaining fibre (PMF) and a multi-mode fibre (MMF) using a CO

Fiber-Optic Sensing of Coal Mine Gas Based on Fabry

Download Citation Fiber-Optic Sensing of Coal Mine Gas Based on Fabry Perot Interferometer In this paper, According to mine gas accident frequent and the shortages of traditional gas

Fiber-Optic Sensing of Coal Mine Gas Based on Fabry

Fiber-Optic Sensing of Coal Mine Gas Based on Fabry Perot Interferometer. Article Preview. Abstract: In this paper, According to mine gas accident frequent and the shortages of traditional gas monitoring system, puts forward some eigenvalue fabry-perot interference (EFPI) technology, its spectrum domain to study the mechanism of white light

A high resolution interferometric method to measure local

2018-2-15  We present an experimental method to study time-dependent, CO 2-induced, local topography changes in mm-sized composite samples, plus results showing heterogeneous swelling of coal and shale on the nano- to micrometer scale.These results were obtained using high resolution interferometry measurements of sample topography, combined with a new type of experimental microfluidic device.

JGJ-1 Methane Interferometer Detecting Regulator :

2007-4-11  JGJ-1 Methane Interferometer Detecting Regulator Product News Wednesday, April 11, 2007: Shaanxi Star Coal Mine Safety Equipment Co., Ltd The product adopts the principle of the pressure connecting vessels, is used for calibrating the accuracy and air tightness of the Methane Interferometer.

气体检测实验室 苏州市计量测试院官方网站 苏州计量院

2018-7-24  Coal mine oxygen determination generally technology condition 17 光干涉式甲烷测定器 Methane Detector of Interferometer Type 18 催化燃烧低浓度甲烷传感器 Coal mine low-concentration carrier catalytic methane transducer 19 便携式催化燃烧式甲烷测定器

Effect of spraying on coal dust diffusion in a coal mine

2020-9-1  Aimed at effectively controlling coal dust pollution in the mining face of a coal mine, this study first conducted a theoretical analysis and then combined a spraying experiment and a numerical simulation to perform an in-depth examination of the atomizing characteristics and dust suppression performance of a coal cutter external spraying device.

Low-cost fiber optic extrinsic Fabry–Perot interferometer

2020-2-15  A low cost, compact-extrinsic Fabry–Perot interferometer (EFPI) based on a polyethylene diaphragm for vibration detection is proposed. A fiber optic Fabry–Perot accelerometer (FOFPA) with a diameter of 10.0 mm is fabricated and a silica gel is adhered to the middle of polyethylene diaphragm as a mass load to form a compact structure.

Interferometer ethod Sensor I stg.product.rikenkeiki.co.jp

2021-6-22  In early times, it was used inside coal mines to measure the methane concentration and in recent years, it is widely used to measure solvent concentrations or heat quantities of fuel gases such as natural gas. FI-900 Interferometer ethod Sensor I Conceptual rendering of the sensor elements] Stationary sensor Example: FI-23 Category Detectable gas

气体检测实验室 苏州市计量测试院官方网站 苏州计量院

2018-7-24  Coal mine oxygen determination generally technology condition 17 光干涉式甲烷测定器 Methane Detector of Interferometer Type 18 催化燃烧低浓度甲烷传感器 Coal mine low-concentration carrier catalytic methane transducer 19 便携式催化燃烧式甲烷测定器

Complete Interferometer System OS-9258 Products

The PASCO Interferometer is a high-precision, movable-mirror interferometer that can be used to perform Michelson, Fabry-Perot, and Twyman-Green interferometry. The mirrors are attached with thumbscrews, so it’s easy to set up and change configurations. The PASCO Interferometer

Low-cost fiber optic extrinsic Fabry–Perot interferometer

2020-2-15  A low cost, compact-extrinsic Fabry–Perot interferometer (EFPI) based on a polyethylene diaphragm for vibration detection is proposed. A fiber optic Fabry–Perot accelerometer (FOFPA) with a diameter of 10.0 mm is fabricated and a silica gel is adhered to the middle of polyethylene diaphragm as a mass load to form a compact structure.

Using time series InSAR to assess the deformation activity

2021-8-20  Purpose There are a large number of open-pit coal mines in the world, and their dependent, heterogeneous dump sites are one of the world’s largest chronic waste concerns. The long-term existence of dumps is vulnerable to non-uniform deformation and erosion simultaneously, seriously threatening also the surrounding geological and ecological security. Hence, it is critical to monitor the

Coal mine Safety Features Dec 2007 Photonics Spectra

Coal mine Safety. Intelligent optical fiber sensor systems may help reduce the number of mining disasters. Tongyu Liu, Shandong Micro-Sensor Photonics Ltd., and Eric Bergles and William Yang, BaySpec Inc. According to the latest official mining statistics, from 2003 to 2006, more than 20,000 people died from coal mining accidents in China.

New Structural Design of Coal Mine Rescue Robot

Abstract: Based on the particularity analysis of coal mine accidents and fire occurred, a rescue robot is designed for coal mine and fire rescue. This robot adopts four tracks composite drive mechanism with front and rear machine hinged, and has good climbing, obstacle capability, the ground adaptability, mechanical properties, waterproof, fireproof, explosion-proof and other functions.

周斌 研究人员 华南师范大学光及电磁波研究中心 SCNU

2016-2-27  26. Xia, Tian-Hao*,Liu, Wei-Sheng,Zhou, Bin,Gu, Bo-Bo,Yan, Chun-Sheng,Quasi-distributed sensing network based on coherence multiplexing and spatial division multiplexing for coal mine security monitoring,Journal of Zhejiang University-Science C27.

陶传义(主任)-新理学院 cqut.edu

2019-5-29  个人简介陶传义,博士,教授,研究生导师。2001-2011年本、硕、博就读于重庆大学,2011年获重庆大学光学工程专业博士学位,现为重庆理工大学理学院物理与能源系专职教师。2015-2016年在美国西北大学机械工程系从事博士后研究1年,合作导师为SridharKrishnaswamy教授。

杨宏伟 中山大学土木工程学院 Sun Yat-sen University

个人简介 Brief Introduction 中山大学“百人计划”副教授,硕士生导师,2021年4月加入中山大学,曾先后在澳大利亚新南威尔士大学、香港大学和德国波鸿鲁尔大学做过博士后研究, 获澳大利亚新南威尔士大学岩土工程专业博士学位(2014),中南大学地质工程专业学士学位(2010).

Interferometer ethod Sensor I stg.product.rikenkeiki.co.jp

2021-6-22  In early times, it was used inside coal mines to measure the methane concentration and in recent years, it is widely used to measure solvent concentrations or heat quantities of fuel gases such as natural gas. FI-900 Interferometer ethod Sensor I Conceptual rendering of the sensor elements] Stationary sensor Example: FI-23 Category Detectable gas

Evaluating Portable Infrared Spectrometers for Measuring

2012-8-30  coal dust by making changes to their work activities based on the continuous reading of the device 7 but does not provide infor­ mation specific to silica exposure. Coal miners’ exposure to silica is currently determined in the U.S. by collecting a filter sample and submitting it to the Mine

Complete Interferometer System OS-9258 Products

The PASCO Interferometer is a high-precision, movable-mirror interferometer that can be used to perform Michelson, Fabry-Perot, and Twyman-Green interferometry. The mirrors are attached with thumbscrews, so it’s easy to set up and change configurations. The PASCO Interferometer

Gas Detector Models Calibrated by Coal Mines Technical

2018-12-18  International Gas Detector Sentinel 6, RMS 682 CO2 International Sensor Technology AG5000/AG5100 Maihak Multor 610 (0‐5% CO, 0‐100% CO2, 0‐100%

(PDF) Infrared Analysis of Respirable Coal Mine Dust for

Infrared Analysis of Respirable Coal Mine Dust for Quartz: Thirty-Five Years. Download. Related Papers. Evaluating Portable Infrared Spectrometers for Measuring the Silica Content of Coal Dust. By Nate Murphy. Deposition uniformity of coal dust on filters and its effect on the accuracy of FTIR analyses for silica.

Coal mine Safety Features Dec 2007 Photonics Spectra

Coal mine Safety. Intelligent optical fiber sensor systems may help reduce the number of mining disasters. Tongyu Liu, Shandong Micro-Sensor Photonics Ltd., and Eric Bergles and William Yang, BaySpec Inc. According to the latest official mining statistics, from 2003 to 2006, more than 20,000 people died from coal mining accidents in China.

Mine Gas Detections & Monitoring SlideShare

2016-1-9  Interferometer detectors: Interferometer is based on the difference in the index of refraction between two gases. Basically, a beamof light is split, with one part passing through a chamber filled with air and the other passing through a chamber filled with an unknown gas Machine-mounted methane monitors are required in coal mines

杨宏伟 中山大学土木工程学院 Sun Yat-sen University

个人简介 Brief Introduction 中山大学“百人计划”副教授,硕士生导师,2021年4月加入中山大学,曾先后在澳大利亚新南威尔士大学、香港大学和德国波鸿鲁尔大学做过博士后研究, 获澳大利亚新南威尔士大学岩土工程专业博士学位(2014),中南大学地质工程专业学士学位(2010).

Global Emissions Monitoring GHGSat

Industry, government, and academia require precise, independent emissions intelligence to take action. Our custom emissions analytics service is organized and layered with our high-resolution imagery and hotspot detection data from satellites and aircraft observations, along with third-party data sources to address needs ranging from persistent monitoring to leak risk assessment and predictive

Industrial and agricultural ammonia point sources exposed

2018-12-5  Satellite observations reveal over 200 ammonia hotspots associated with agricultural and industrial point sources, which emit much larger quantities of ammonia to the atmosphere than previously