3.04 Gravimetric Methods – Superconducting Gravity Meters
نویسنده
چکیده
3.04.1 The Superconducting Gravimeter 66 3.04.1.1 Historical 66 3.04.1.1.1 Early years at UCSD 66 3.04.1.1.2 Early commercial model TT instruments (1981–94) 67 3.04.1.1.3 The Compact SG (1994–2002) 68 3.04.1.2 Basic Principles of Operation 69 3.04.1.2.1 Superconducting components 69 3.04.1.2.2 Displacement transducer and feedback system 71 3.04.1.2.3 Temperature control 71 3.04.1.2.4 Tilt compensation system 71 3.04.1.2.5 Sphere and sphere resonance 72 3.04.1.3 Development of the Dual-Sphere Design 72 3.04.1.4 Instrument Performance 73 3.04.1.4.1 Instrument drift 73 3.04.1.4.2 Calibration stability 73 3.04.1.4.3 Instrumental noise and precision 73 3.04.1.5 Recent Developments 74 3.04.1.5.1 Ultralong hold time dewar 74 3.04.1.5.2 Observatory dewar 75 3.04.1.5.3 Data acquisition system and remote control 75 3.04.1.6 User Requirements 76 3.04.1.6.1 Operation and maintenance 76 3.04.1.6.2 Site location 77 3.04.1.6.3 Site noise 77 3.04.1.6.4 Site stability 77 3.04.2 SG Data Analysis 78 3.04.2.1 Preprocessing 78 3.04.2.1.1 Second data sampled from an SG 78 3.04.2.1.2 Minute data from the GGP database (ICET) 79 3.04.2.1.3 Remove–restore technique 81 3.04.2.1.4 Treatment of gaps in gravity data 81 3.04.2.1.5 Disturbances and offsets 82 3.04.2.1.6 Automatic procedures 82 3.04.2.1.7 Processing for different purposes 83 3.04.2.1.8 Restoring the signal 85 3.04.2.2 Solid Earth and Ocean Tides 85 3.04.2.2.1 Tide-generating potential 85 3.04.2.2.2 Elastic response of the Earth 86 3.04.2.2.3 Ocean tides and loading 87 3.04.2.2.4 Tidal analysis 88 3.04.2.3 Atmospheric Pressure Effects 88 3.04.2.3.1 Single admittance factors 89
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