Development of Oil Operated Virtual Environment Equipment (OOVEE)

Tamura, Hitoshi; Araki, Eiichiro; Kinoshita, Masataka; Hamano, Yozo; Kashiwase, Kazuhiko; Kawada, Yoshifumi

doi:10.5918/jamstecr.13.65

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…Hence sample rate for each pressure gauge is approximately 1 min intervals. This simulator was introduced firstly in 2009 [5], and we performed some trouble shootings in the early stage. Hence sensors' stability evaluation for DONET pressure gauges done until 2011 was rather premature, while that of DONET2 pressure gauges have been substantially refined.…”

Section: B Pressure Standardmentioning

confidence: 99%

Long-term features of quartz pressure gauges inferred from experimental and in-situ observations

Matsumoto

Araki

Kawaguchi

et al. 2014

Oceans 2014 - Taipei

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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 ℃, which is equivalent to the oceanbottom 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.

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Section: B Pressure Standardmentioning

confidence: 99%

Long-term features of quartz pressure gauges inferred from experimental and in-situ observations

Matsumoto

Araki

Kawaguchi

et al. 2014

Oceans 2014 - Taipei

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“…Ocean-bottom bore-hole temperature and pressure simulator developed by JAMSTEC is used as the laboratory experiment [6]. This simulator mainly consists of a high accuracy pressure standard composed of the piston gauge (DR Instruments Inc., P07302), the pressure calibration/controller (DR Instruments Inc" PPCR), and the reference pressure monitor (DH Instruments Inc., RPM4), and high/low thermal controlled oil chamber to which pressure sensors would be set (Fig.…”

Section: Laboratory Experimentsmentioning

confidence: 99%

Initial characteristics of pressure sensors

Matsumoto

Kawaguchi

Araki

2015

2015 IEEE Underwater Technology (UT)

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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. DONET in 20 observatories consists of various geophysical sensors such as broadband seismometer, seismic accelerometer, tsunami meter, and so on. The present study focuses on pressure sensors being used as tsunami meters measuring hydraulic pressure change.Pressure sensors specify their performance for both hysteresis and repeatability, however there is no specification about the long-term sensor's stability. In this study, we evaluate the initial sensor's stability in terms of the laboratory experiment and the in-situ measurements. The high accuracy pressure standard is used for the laboratory experiment. The present experiment has been done by applying 20 MPa hydro-static pressure to the pressure sensors, which is equivalent to approximately 2,000 m water depth under the constant temperature of 2°C for duration of one month. As a result, our experiment suggests that sensor's drift vary among pressure sensors and the sensor's drift occurs 10 cm per month in maximum. On the other hand, we evaluate the sensor's drift since deployment into the deep-sea by removing tide component. The in-situ measurement indicates that the sensor's drift continues after the deployment. Some pressure sensor's drift in the initial stage from the in-situ measurement corresponds to that from the experiment for the direction and the rate.

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