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Wu Qiong, Teng Yuntian, Zhang Bing, Guo Youguang. 2016: Development and experiments of the gravity vertical gradient measuring system based on the laser interferometry. Acta Seismologica Sinica, 38(5): 794-802.
Citation: Wu Qiong, Teng Yuntian, Zhang Bing, Guo Youguang. 2016: Development and experiments of the gravity vertical gradient measuring system based on the laser interferometry. Acta Seismologica Sinica, 38(5): 794-802.
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Development and experiments of the gravity vertical gradient measuring system based on the laser interferometry

  • 1.

    Institute of Geophysics， China Earthquake Administration， Beijing 100081， China

  • 2.

    Institute of Disaster Prevention， Hebei Sanhe 065201， China

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  • Received Date: February 22, 2016
  • Revised Date: April 24, 2016
  • Published Date: August 31, 2016
    Graphical Abstract
    • Abstract
  • This paper develops a new apparatus for measuring the vertical gravity gradient based on the laser interferometry. The apparatus uses the method of dual optical interferometer to determine the time shifting coordinates of dual free-fall bodies spaced 50 cm vertically， and then calculates the gravity gradient by using differential algorithm. In design and development of this instrument， particular attention is paid to those aspects which would affect synchronistically automatic control of the free-fall bodies and vertical adjustment of the dual measuring beams. The results of the experiments show that the apparatus can obtain the interference signals of these two free-fall bodies during the freely falling and complete the measurement of the gravity gradient with accuracy better than 100 E.
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    • References (32)
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