The Self-Calibrating Tilt Accelerometer: A Method for Observing Tilt and Correcting Drift With a Triaxial Accelerometer

IF 2.9 3区 地球科学 Q2 ASTRONOMY & ASTROPHYSICS
E. K. Fredrickson, W. S. D. Wilcock, M. J. Harrington, G. Cram, J. Tilley, D. Martin, J. Burnett
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Abstract

We present observations from two field deployments of a calibrated tiltmeter that we name the Self-Calibrating Tilt Accelerometer (SCTA). The tiltmeter is based upon a triaxial quartz crystal accelerometer; the horizontal channels measure tilt and are periodically rotated into the vertical to obtain a measurement of the acceleration of gravity. Changes in the measured total acceleration are ascribed to drift in the vertical channel and used as calibrations for removing that same drift from the tilt time series observed between calibrations. Changes in the span (sensitivity) of the accelerometer channels can also be measured by calibrating them pointing up and down. A 3-year test on the seafloor at Axial Seamount show that the calibrations are consistent with a linear-exponential model of drift to a RMS residual of ∼0.5 μg (μrad). The calibrated tilt time series was impacted by platform settling for the first 2 years, but after repositioning the tiltmeter, the calibrated observations were consistent for the final year with the tilt observed on a nearby LILY tiltmeter, within an assumed level of drift for the unconstrained LILY sensor. A separate 15-month test in a stable vault at Piñon Flat Observatory was complicated by seasonal temperature variations of >5°C; the calibrations are consistent with a linear-exponential model of drift to ∼2 μg RMS when temperature and temperature time-derivative dependence is included. Similarly, the calibrated tilt time series was impacted by thermal deformation of the SCTA assembly. A future test in a thermally and tectonically stable borehole will be required to assess the accuracy of the SCTA.

Abstract Image

自校准倾斜加速度计:使用三轴加速度计观测倾斜和校正漂移的方法
我们介绍了两次实地部署校准倾斜仪的观测结果,并将其命名为自校准倾斜加速度计(SCTA)。倾角仪以三轴石英晶体加速度计为基础;水平通道测量倾角,并定期旋转到垂直方向,以获得重力加速度的测量值。测得的总加速度的变化归因于垂直通道的漂移,并用作校准,以从校准之间观测到的倾斜时间序列中去除相同的漂移。加速度计通道跨度(灵敏度)的变化也可以通过上下校准来测量。在轴向海山海底进行的为期 3 年的测试表明,校准与漂移的线性-指数模型一致,均方根残差为 ∼ 0.5 μg(μrad)。校准后的倾角时间序列在头两年受到平台沉降的影响,但在重新定位倾角仪后,最后一年的校准观测结果与在附近的 LILY 倾角仪上观测到的倾角一致,在无约束 LILY 传感器的假定漂移水平范围内。在皮农平原天文台的稳定拱顶中进行的为期 15 个月的单独测试因 5°C 的季节性温度变化而变得复杂;如果将温度和温度时间衍生物依赖性包括在内,校准结果与漂移至 ∼2 μg RMS 的线性-指数模型一致。同样,校准的倾斜时间序列也受到 SCTA 组件热变形的影响。今后需要在热和构造稳定的钻孔中进行测试,以评估 SCTA 的准确性。
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来源期刊
Earth and Space Science
Earth and Space Science Earth and Planetary Sciences-General Earth and Planetary Sciences
CiteScore
5.50
自引率
3.20%
发文量
285
审稿时长
19 weeks
期刊介绍: Marking AGU’s second new open access journal in the last 12 months, Earth and Space Science is the only journal that reflects the expansive range of science represented by AGU’s 62,000 members, including all of the Earth, planetary, and space sciences, and related fields in environmental science, geoengineering, space engineering, and biogeochemistry.
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