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coal mine interferometer

coal mine interferometer

Temperature-insensitive Fabry–Perot interferometer

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 2 laser splicer.

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Zimbabwe Coal Mine Interferometer Price

It Occurred In The Bachatsky Open-Cast Coal Mine Which Is. 10 Km Long, 2.2 Km Zimbabwe), Kremasta (Greece), Hsingfengkiang (China) And Killari. (India). In China Uid- And Heat-Loss And May Increase Seismic Rates. Using Interferometric Synthetic Aperture

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Temperature-insensitive Fabry-Perot interferometer

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 2 laser splicer.

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Interferometric Radar IDS GeoRadar

High-resolution radar system for early warning and real-time focus monitoring in open pits, quarries, strip coal mines and tailing dams.

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Low-cost fiber optic extrinsic Fabry–Perot

2020-2-15  Fiber optic accelerometer (FOA) is typically used for vibration measurement in the field of earthquake monitoring , building structural health monitoring , oil exploration , , coal mine hazard detection , owing to its simple structure, immunity to electromagnetic interference, the ability of working under harsh environment, and small size and so on .

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Complete Interferometer System - OS-9258 -

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

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Introductory Michelson Interferometer - OS-8501 -

This interferometer is a precision instrument for the introductory lab. It’s easier to use, more compact, and less expensive than PASCO’s advanced interferometer. It’s capable of measuring the wavelength of monochromatic light with an accuracy of better than 5%.

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周斌 - 副教授 - 华南师范大学华南先进光电子研究院 - SCNU

2018-4-3  Zhou, Bin,Guan, Zuguang,Yan, Chunsheng,He, Sailing*,Interrogation technique for a fiber Bragg grating sensing array based on a Sagnac interferometer and an acousto-optic modulator,Optics Letters,2008,33(21):2485-2487。16.

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陶传义(主任)-新理学院 - cqut.edu.cn

2019-5-29  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

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Temperature-insensitive Fabry-Perot interferometer

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 2 laser splicer.

Get Price

Interferometric Radar IDS GeoRadar

Safely ahead of slope instability by reliably measuring mine movements ... High-resolution radar system for early warning and real-time focus monitoring in open pits, quarries, strip coal mines and tailing dams. High-resolution radar system for early warning and real-time focus monitoring in open pits, quarries, strip coal mines and tailing ...

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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 ...

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Experimental characterization of multi-nozzle

2019-2-11  The experimental system mainly consists of a laser Doppler interferometer, a coal mine roadway model, a dust generator, a ventilation device, a roadway environment analyzer, a spray device, and a data acquisition and analysis apparatus. The experimental system extends 15.5 m.

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Complete Interferometer System - OS-9258 -

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

Get Price

Introductory Michelson Interferometer - OS-8501 -

Introductory Michelson Interferometer. •. OS-8501. Beam-splitting schematic for a basic Michelson Interferometer. U.S. Educator Price. $1,275. Qty: Add to Cart. This interferometer is a precision instrument for the introductory lab.

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Coal mine Safety Features Dec 2007 Photonics

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.

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Quantifying Time-Averaged Methane Emissions from ...

2020-2-28  September 18th, 2018. The white ‘x’ symbols mark the location of the coal mine vent (36.792 N, 108.389 W) and the white arrows show wind direction inferred from the orientation of the plumes (see text). Figure 1 shows methane column enhancements from individual GHGSat-D scenes centred on the San Juan coal 75 mine vent.

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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.

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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.

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Fiber-Optic Sensing of Coal Mine Gas Based on Fabry ...

Fiber-Optic Sensing of Coal Mine Gas Based on Fabry - Perot Interferometer

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APPLICATION OF SATELLITE RADAR

2018-4-1  Seven mining areas of about 80 [km.sup.2] are in charge of two active mines: Mine Plant 1 (merged previous the CSA, the Lazy and the Darkov mines) and Mine Plant 2 (former the CSM mine). In the Ostrava subbasin, terminating of mine dewatering, which had been associated with coal mining for hundreds of years, started in 1995.

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Introductory Michelson Interferometer - OS-8501 -

Introductory Michelson Interferometer. •. OS-8501. Beam-splitting schematic for a basic Michelson Interferometer. U.S. Educator Price. $1,275. Qty: Add to Cart. This interferometer is a precision instrument for the introductory lab.

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光干渉式メタンガス検定器 36 - JAIMA

2017-10-19  coal mine and is contributing to the Security. 理研計器株式会社/Exhibition room at RIKEN KEIKI CO., LTD. 光干渉式メタンガス検定器 No.36 Interferometer Methane Gas Indicator Created Date

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Quantifying Time-Averaged Methane Emissions from ...

2020-2-28  September 18th, 2018. The white ‘x’ symbols mark the location of the coal mine vent (36.792 N, 108.389 W) and the white arrows show wind direction inferred from the orientation of the plumes (see text). Figure 1 shows methane column enhancements from individual GHGSat-D scenes centred on the San Juan coal 75 mine vent.

Get Price

Fiber optic sensor-based intelligent coal mines ...

2007-7-18  Fiber optic sensors have become increasingly attractive for application in advanced intelligent coal mines, which consist of extensive sensor network to monitor the structural integrity, environmental safety and production parameters. Fiber optic based strain (mining pressure), temperature, water pressure, methane gas, seismic and ultrasound sensors can be used to monitor the condition of

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Quantifying Time-Averaged Methane Emissions from ...

2020-10-9  large coal production rates and/or previous reports of large methane emissions.4,15,28,29 Here, we examine GHGSat-D observations of the coal mine vents taken between August 2016 and December 2018, totaling 14−24 cloud-free observations per mine (see Table 1). The Appin mine was closed on 28 June 2017 because of safety concerns and

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Fiber-Optic Extrinsic Fabry-Perot Interferometer

In this paper, a novel method used for Fabry-Perot cavity length's demodulation in high-speed and large scope measurement was proposed. Principle of the method is based on uniqueness of intensity of multiple wavelengths in the scope of Fabry-Perot vibration. This technique offers flexibility of selecting incident wave length and enhances the scope of demodulation of cavity length, compared ...

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Experimental Study on Temperature Response of

2020-10-19  Liquid nitrogen freeze–thaw has been used in oil, shale gas and coalbed methane exploitation as an efficient fracturing technology. This paper aimed to study the effect of different coal ranks and liquid nitrogen soaking times on the temperature distribution of coal samples, and to explore the temperature evolution mechanism of different coal ranks during liquid nitrogen soaking.

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工程技术, 综合类期刊, - X-MOL

A coupled Galerkin and Newmark techniques for resonance simulation of the electrically single-curved system under low-velocity impact Eng. Comput. (IF 3.938) Pub Date : 2021-06-21. Chunliang Zhang, Shangbin Long, Alireza Mohammadi, Farzaneh Sharifi Bagh, Abdellatif Selmi, Afrasyab Khan. The purpose of this paper is to study the stability ...

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Interferometer Method Sensor: FI - RIKEN KEIKI

2019-4-1  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-800 Interferometer Method Sensor: FI [Conceptual rendering of the sensor elements] Stationary sensor Example: FI-23 Category ...

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RESEARCH REPORT 248

2019-12-5  European Coal and Steel Community (ECSC) and several mine operators. Its. Its contents, including any opinions and/or conclusions expressed, are those of the authors alone and do not necessarily reflect HSE ... Interferometer. (c) Schematic Drawing Of A Heterodyne Interferometer, With

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Complete Interferometer System - OS-9258 -

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

Get Price

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 Safety and Health Administration

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光干渉式メタンガス検定器 36 - JAIMA

2017-10-19  coal mine and is contributing to the Security. 理研計器株式会社/Exhibition room at RIKEN KEIKI CO., LTD. 光干渉式メタンガス検定器 No.36 Interferometer Methane Gas Indicator Created Date

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Fiber optic sensor-based intelligent coal mines ...

2007-7-18  Fiber optic sensor-based intelligent coal mines Fiber optic sensor-based intelligent coal mines Liu, T.; Ni, J.; Li, Y.; Ma, L.; Liu, X. 2007-07-18 00:00:00 ABSTRACT Fiber optic sensors have become increasingly attractive for application in advanced intelligent coal mines, which consist of extensive sensor network to monitor the structural integrity, environmental safety and production

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(PDF) Infrared Analysis of Respirable Coal Mine Dust

Infrared Analysis of Respirable Coal Mine Dust for Quartz: Thirty-Five Years. Sharon Ainsworth. 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

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Comprehensive Study on Bituminous Coal Oxidation by

Jinzhengtai Coal Mine in Ordos, Inner Mongolia, Suncun Coal Mine in Tai’an, Shandong, and Xuandong No.2 Coal Mine in Zhangjiakou, Hebei. The Jinzhengtai Mine is an open-pit mine, which was reconstructed based on an un-derground coal mine. The coal sample was taken from No. 6 coal seam. The average ignition point of the sample is 317..320 C ...

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Paper: A novel radar-based system for underground

Abstract: Ground collapse is a serious issue for underground mining, and currently there is a lack of remote sensing monitoring systems to perform real-time deformation monitoring. Extensometers can be used in several situations; however, this

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WORLD OF MINING ENGINEERS: MINE GASES

2015-5-18  Typical analysis of atmospheric air which also represents the intake air of any mine is given below. Constituents by weight % by volume %. Oxygen 23.15 20.93. Nitrogen (Including Argon and other rare inert gases) 76.81 79.04. Carbon dioxide 0.04 0.03. Argon is

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