Long-term features of quartz pressure gauges inferred from experimental and in-situ observations
Long-term features of quartz pressure gauges inferred from experimental and in-situ observations
复制标题
从实验和现场观察推断石英压力计的长期特征
DOI：
10.1109/oceans-taipei.2014.6964447
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Y. Kaneda
中科院分区：
文献类型：
--
作者：
H. Matsumoto;E. Araki;K. Kawaguchi;S. Nishida;Y. Kaneda
DONET，即，2010年初，用于地震和海啸的密集海底网络系统已在日本西南部的南海海槽开始运行，并在不久的将来向西扩展为DONET 2。DONET观测站由各种传感器组成，如宽带地震计，地震加速度计，海啸计等。本研究的重点是石英压力计被用作海啸计测量水压变化。在本研究中，在部署到深海之前，使用JAMSTEC的高精度压力标准对长期压力计的特性进行了评估。高精度压力标准主要由活塞式压力计、压力发生器/控制器、参考压力监测器和热控大容量腔室定制，虚拟再现深海环境。在2°C的恒定温度下向压力计施加20 MPa的液压，这相当于2，000米深的海底持续约一个月。因此，不同压力表的传感器漂移不同，这意味着每个月最多可能发生几厘米的逐渐漂移。我们还通过分析长期的现场观测结果，讨论了传感器部署到深海后的漂移情况，表明早期以每年几到十几厘米的速度持续，然后趋于逐渐减小。
DONET, i.e., the dense ocean-floor network system for earthquakes and tsunamis has started its operation in the Nankai Trough, SW Japan in the early of 2010, and followed by the extension to the westward region as DONET2 in near future. DONET observatory is composed of various sensors such as broadband seismometer, seismic accelerometer, tsunami meter, etc. The present study focuses on quartz pressure gauges being used as tsunami meters measuring water pressure change. In the present study, long-term pressure gauges' characteristics have been evaluated by using the JAMSTEC's high accuracy pressure standard before deploying into the deep-sea. The high accuracy pressure standard is mainly customized by a piston gauge, a pressure generator/controller, a reference pressure monitor, and a thermal controlled large capacity chamber, which virtually reproduces the deep-sea environment. 20 MPa hydraulic pressure was applied to the pressure gauges under the constant temperature of 2°C, which is equivalent to the ocean-bottom of 2,000 meters depth for the duration of approximately one month. As a result, sensors' drift varies among pressure gauges, however, which implies that the gradual drift possibly occurs a few centimeters per month in maximum. We also discuss the sensors' drift after deploying the deep-sea by analyzing the long-term in-situ observations, which shows that it continues at a rate of a few to ten centimeters per year in the early stage, then it tends to be reduced gradually.