5 Conclusions
The calibration of tiltmeter’s scale value is very important. Without a correct calibration, the observation is of little application significance. At present, a ‘direct calibration’ method (ZHU, 1993) is used, which gives a known displacement value on the instrument and then measures the output signals of the instrument under such a condition. However, the known displacement value must be very accurate.
We believe that the calibration by bulging plate can meet the accuracy, but the following factors should be noted.
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1)
It should be very strict in selecting materials and techniques for bulging-plate making.
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2)
Regular recalibration is needed for bulging plates that have been used for many years in order to ensure the credible scale values. Moreover, it is necessary to develop a portable equipment for itinerate calibration at seismic stations.
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3)
Mercury is toxiferous as a kind of pressure-transmitting medium in the bulging plates. By accident, the vapor of leaking mercury is liable to cause hydrargyrism to the observer. Therefore, it’s better to replace mercury with innocuous high-density liquid in the bulging plates.
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Contribution No. 05FE3022, Institute of Geophysics, China Earthquake Administration.
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Zhang, Zz., Zhu, H. & Wu, J. Research on bulging plate of scaler for horizontal pendulum tiltmeter. Acta Seimol. Sin. 18, 618–623 (2005). https://doi.org/10.1007/s11589-005-0041-9
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DOI: https://doi.org/10.1007/s11589-005-0041-9