| An Experimental Study on Modulating the Large Volume Airgun Array Signals through Asynchronous Excitation |
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| 作者姓名： | YANG Wei WANG Baoshan LUO Mingzhang LI Xiaobin CHEN Yong |
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| 作者单位： | Key Laboratory of Seismic Observation and Geophysical Imaging, Institute of Geophysics, CEA, Beijing 100081, China,Key Laboratory of Seismic Observation and Geophysical Imaging, Institute of Geophysics, CEA, Beijing 100081, China;School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China,School of Electronic Information, Yangtze University, Jingzhou 434100, Hubei, China,Yunnan Earthquabe Agency, Kunming 650224, China,Key Laboratory of Seismic Observation and Geophysical Imaging, Institute of Geophysics, CEA, Beijing 100081, China;Institute of Geophysics and Geodynamics, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210046, China |
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| 基金项目： | This project was sponsored by the National Key R&D Program of China (2018YFC1503202) and the National Natural Science Foundation of China (41574052, 41790463). |
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| 摘 要： | Large volume airgun arrays have been widely used in exploring and monitoring underground structures for nearly a decade. Nowadays, large volume airgun arrays adopt the synchronous excitation mode, and source characteristics are controlled by the source signal of a single airgun, which to some extent limits its application. In order to realize the asynchronous excitation of the airgun array, we developed a new firing system for the airgun array, and carried out a field experiment in the Binchuan Fixed Airgun Signal Transmission station to study the influences of the asynchronous excitation on the source signal. The experimental results show that:the newly developed airgun array firing system can ignite the airguns according to the setting time series with high precision. By designing the excitation time series, the asynchronous excitation can enhance the energy of airgun source signal at 3-5Hz, and reduce the energy of pressure pulse wave at 6-18Hz. The signal detection capability of the asynchronous excitation with time series mode is equivalent to the synchronous excitation.
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| 关 键 词： | Active source Large volume airgun Asynchronous excitation Source characteristics High precision |
| 收稿时间： | 2019/2/7 0:00:00 |
| 修稿时间： | 2019/3/3 0:00:00 |
An Experimental Study on Modulating the Large Volume Airgun Array Signals through Asynchronous Excitation |
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| YANG Wei,WANG Baoshan,LUO Mingzhang,LI Xiaobin,CHEN Yong.An Experimental Study on Modulating the Large Volume Airgun Array Signals through Asynchronous Excitation[J].Earthquake Research in China,2019,33(2):195-207. |
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| Authors: | YANG Wei WANG Baoshan LUO Mingzhang LI Xiaobin and CHEN Yong |
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| Institution: | Key Laboratory of Seismic Observation and Geophysical Imaging, Institute of Geophysics, CEA, Beijing 100081, China,Key Laboratory of Seismic Observation and Geophysical Imaging, Institute of Geophysics, CEA, Beijing 100081, China;School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China,School of Electronic Information, Yangtze University, Jingzhou 434100, Hubei, China,Yunnan Earthquabe Agency, Kunming 650224, China and Key Laboratory of Seismic Observation and Geophysical Imaging, Institute of Geophysics, CEA, Beijing 100081, China;Institute of Geophysics and Geodynamics, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210046, China |
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| Abstract: | Large volume airgun arrays have been widely used in exploring and monitoring underground structures for nearly a decade. Nowadays, large volume airgun arrays adopt the synchronous excitation mode, and source characteristics are controlled by the source signal of a single airgun, which to some extent limits its application. In order to realize the asynchronous excitation of the airgun array, we developed a new firing system for the airgun array, and carried out a field experiment in the Binchuan Fixed Airgun Signal Transmission station to study the influences of the asynchronous excitation on the source signal. The experimental results show that:the newly developed airgun array firing system can ignite the airguns according to the setting time series with high precision. By designing the excitation time series, the asynchronous excitation can enhance the energy of airgun source signal at 3-5Hz, and reduce the energy of pressure pulse wave at 6-18Hz. The signal detection capability of the asynchronous excitation with time series mode is equivalent to the synchronous excitation. |
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| Keywords: | Active source Large volume airgun Asynchronous excitation Source characteristics High precision |
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