[SCG56-P27] Prototype of deep-sea ocean bottom pressure recorder with self-calibration capability using “A-0-A” approach for detection of long-term crustal deformation
Based on these laboratory experiment results, we have started to develop a proto-type of ocean bottom pressure recorder with self-calibration capability using “A-0-A” approach for deep-water (up to 7,000 m) deployment. We install all the equipments including a pressure sensor in a 17-in glass sphere. To measure both of the internal and external (water) pressure by a single sensor, we adopt 3-way a ball valve controlled by an electric actuator in front of the sensor, as in the previous self-calibrating system using a dead-weight tester. The actuator is operated by the microcomputer to switch by arbitrary interval. We also install alternative barometer to compare the internal pressure value recorded by the pressure sensor. The development is still under way, and we will show more detail characteristic of the prototype system and its potential abilites.