Calibration of deep sea differential pressure gauge

概要

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A deep-sea differential pressure gauge (DPG) is very sensitive pressure sensor suitable for observation for earthquakes and acoustic phenomena in frequencies 10mHz to 1Hz, providing much lower noise floor compared to existing quartz pressure gauge. Frequency response of DPG is affected by temperature and pressure environment where the sensor is installed. Methods to estimate sensitivity and frequency response of DPG were developed, by comparing pressure data with those from quartz pressure gauge of Paroscientific, Inc. Two calibration methods to apply low frequency pressure change were experimented, one in the seafloor, and the other in a laboratory. Using these methods, precise sensitivity and frequency response calibration of DPG can be practiced.