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Wang J.-Y.,Key Laboratory of Optical Fiber Sensoring Technology of Shandong Province | Wang J.-Y.,Shandong Academy of Sciences | Qi H.-F.,Key Laboratory of Optical Fiber Sensoring Technology of Shandong Province | Qi H.-F.,Shandong Academy of Sciences | And 7 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2012

A high sensitive fiber Bragg grating (FBG) geophone detecting system based on narrow line width distributed feedback (DFB) laser is realized by using filtering demodulation. Sensitivity of FBG geophone lies on the structure of the sensor shell and the shape of the reflectivity spectrum of FBG. Experiments on the detecting system's frequency character have been done. Results show that this geophone can detect the smallest acceleration of 1mm/s2 with a flat response from 5Hz to 40Hz.. The experiments on coal mine exhibit that the geophone can be used to measure microseismic signals. The detecting system shows great prospect in micro-seismic detection, and geological disasters detecting. © 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE). Source


Wang J.-Y.,Key Laboratory of Optical Fiber Sensoring Technology of Shandong Province | Wang J.-Y.,Shandong Academy of Sciences | Song G.-D.,Key Laboratory of Optical Fiber Sensoring Technology of Shandong Province | Song G.-D.,Shandong Academy of Sciences | And 7 more authors.
Procedia Engineering | Year: 2011

A high sensitive micro-seismic fiber Bragg grating (FBG) sensor system based on narrow line width distributed feedback (DFB) laser is realized by using filtering demodulation. Sensitivity of micro-seismic FBG sensor lies on the structure of the sensor shell and the shape of the reflectivity spectrum of FBG. Experiments on the sensor system's frequency character have been done. Results show that this sensor has the smallest acceleration of 1mm/s 2. The experiments on coal mine exhibit that the sensor can be used to measure micro-seismic sigmals. So the FBG sensor is feasible to have practical use to measure micro-seismic signals because the sensor has high sensitivity and is easy to be fabricated, it has good low frequency response and the interrogation system is simple, low cost. © 2011 Published by Elsevier Ltd. Source


Liu T.,Shandong Micro Sensor Photonics Ltd. | Liu T.,Shandong Academy of Sciences | Li W.,Yankuang Group | Meng X.,Yankuang Group | And 4 more authors.
Proceedings of the 2015 International Conference on Microwave and Photonics, ICMAP 2015 | Year: 2015

Coal mine combustion is major safety hazard, which is conventionally detected by monitoring characteristic gases such as CO, C2H4 and C2H2, using a tubing bundle gas sampling system and gas chromatograph mess spectrometer. IR gas sensors have been developed to overcome the complexity and cumbersomeness of the GC analyzer, however, cross sensitivity among gases in the IR region affects the detection sensitivity and reliability. Fiber optic multi-gas sensors have been developed which provides advantage of real time detection, low cross sensitivity and low cost for coal mine combustion detection. We report latest development of a multi-gas sensor which has sub-ppm detection sensitivity. The sensors exhibit great potential for on site real time gas monitoring in coal mines and offer the advantage of early detection and warning of coal combustion. © 2015 IEEE. Source


Wang J.,Shandong Academy of Sciences | Deng X.,Yanzhou Coal Industry Company | Gong Z.,Yanzhou Coal Industry Company | Song G.,Shandong Academy of Sciences | And 3 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013

The FBG strain sensors were used for on line monitoring of the stress variation of the lined wall in the gateway retained along goaf of No. 3203 coal mining face in the Dongtan Mine. The results showed that the FBG strain sensor with high measuring range could measure the stress variation accurately during the support process of the gateway retained along goaf and could provide the basis to further optimize the support structure and to determine the support plan of the gateway retained along the goaf. The FBG micro-seismic sensors were used in Xinglong Mine to detect micro-seismic signal. The signals are well received and analyzed to determine the location and energy level of the source of the microseismic event warning. The FBG sensors and detecting system show significant potential for micro-seismic detection and geological disasters detecting. © 2013 SPIE. Source


Wang J.,Shandong Academy of Sciences | Liu T.,Shandong Academy of Sciences | Liu T.,Shandong Micro Sensor Photonics Ltd. | Song G.,Shandong Academy of Sciences | And 4 more authors.
Photonic Sensors | Year: 2014

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 process of the gateway retained along the goaf and could provide the basis to further optimize the support structure and to determine the support plan of the gateway retained along the goaf. The FBG micro-seismic sensors were used in Xinglong Mine to detect the micro-seismic signal. The signals were well received and analyzed to determine the location and energy level of the source of the micro-seismic event warning. The FBG sensors and detecting system show a significant potential for micro-seismic detection and geological disasters detection. © 2014 The Authors(s). Source

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