Calibration of Differential Pressure Gauges Through in Situ Testing
Calibration of Differential Pressure Gauges Through in Situ Testing
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DOI：
10.1029/2019ea000783
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发表时间：
2019-12-18
影响因子：
3.1
通讯作者：
McPeak, S.
中科院分区：
文献类型：
--
作者：
Doran, A. K.;Rapa, M.;McPeak, S.
差压计是现代宽带海底地震仪仪器的标准组成部分，已证明可用于观测各种地震和海洋现象。然而，DPG的响应函数仍然知之甚少，限制了我们从高保真海底压力信号中恢复振幅和相位信息的能力。灵敏度和长周期响应很难在实验室中校准，因为它们会随着温度和压力而变化，并且可能在相同设计的传感器之间变化。我们提出了一个现场实验的结果，旨在确定经验响应函数在原位诱导一个预先定义的压力偏移部署的仪器。结果与通过部署后数据分析独立估计的校准相比毫不逊色。我们的研究表明，观察到的响应函数可以偏离标称响应的两个或更多的因素方面的灵敏度和时间常数。将校准设备（如本文所述的校准设备）用于未来的部署可能被证明是提高压差数据的准确性和实用性的一种具有成本效益的方法。
Differential pressure gauges (DPGs) are a standard component of modern broadband ocean-bottom seismometer instruments and have proven useful for observing a wide range of seismic and oceanographic phenomena. However, the response function of the DPG remains poorly known, limiting our ability to recover amplitude and phase information from seafloor pressure signals with high fidelity. The sensitivity and long-period response are difficult to calibrate in the lab, as they are known to vary with temperature and pressure and perhaps between sensors of the same design. We present the results of a field experiment designed to determine empirical response functions in situ by inducing a pre-defined pressure offset on a deployed instrument. The results compare favorably with calibrations estimated independently through post-deployment data analyses. Our study demonstrates that observed response functions can deviate from the nominal response by a factor of two or greater with regards to both the sensitivity and the time constant. Incorporating calibration devices such as those described here into future deployments may prove to be a cost-effective way to improve the accuracy and utility of differential pressure data.