A Development of a Mobile Pressure Calibrator for Seafloor Geodetic Measurements
A Development of a Mobile Pressure Calibrator for Seafloor Geodetic Measurements
复制标题
用于海底大地测量的移动压力校准器的开发
DOI：
10.1109/oceanskobe.2018.8559426
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
K. Kawaguchi
中科院分区：
文献类型：
--
作者：
Y. Machida;S. Nishida;E. Araki;T. Kimura;H. Matsumoto;K. Kawaguchi
使用水压传感器以每年几厘米的速度测量与地球物理现象相关的海底垂直地壳变形的难度取决于传感器的固有漂移。为了校准压力传感器的漂移分量，需要1 hPa以下的高精度校准器。然而，在将校准器内的压力传感器从实验室运输到海底的过程中，周围环境的变化会影响测量精度。为了克服这些问题，我们开发了一种移动压力计来校准厘米级的压力传感器网络。仪表中内置的石英压力传感器经过控制，使温度和施加的压力恒定在一定范围内，以提高测量精度。压力表的实验室性能测试假设在南海海槽地震带对应的2000m深度海底进行原位测量，结果表明：1）压力传感器温度变化控制在0.1℃以内；2）施加压力变化控制在200hPa以内。考虑到这些结果，由温度特性和压力滞后引起的压力传感器精度的不确定度为0.07 hPa或更小。这表明在运输过程中控制传感器温度和施加的压力可以降低测量精度的不确定性。
Difficulty of measuring vertical crustal deformation on the seafloor at a rate of several cm/year related to geophysical phenomena using a water pressure sensor depends on the inherent drift of the sensor. In order to calibrate the drift components of the pressure sensor, calibrator with high accuracy with 1 hPa or less are necessary. However changes in the ambient environment during a process of transporting the pressure sensor inside the calibrator from a laboratory to the seafloor influence the measurement accuracies. To overcome these problems, we have developed a mobile pressure gauge to calibrate pressure sensor network on a centimeter scale. Quartz pressure sensors incorporated in the gauge are controlled so that the temperature and applied pressure are constant within a certain range to enhance the measurement accuracies. The laboratory performance tests of the pressure gauge assuming an in situ seafloor measurement at 2000m depth corresponding to a seismogenic zone in the Nankai trough showed that: 1) the pressure sensor temperature was controlled with a change of 0.1 degC or less: 2) the applied pressure was controlled with a change of 200 hPa or less. Considering these results, the uncertainties of pressure sensor accuracies by a temperature characteristic and a pressure hysteresis are 0.07 hPa or less. It suggests that the controlling of the sensor temperature and applied pressure during the transportation decrease the uncertainties of the measurement accuracy.