3/24/20 04 Broadband Seismometer Workshop, Lake Tahoe 1 Akiteru Takamori Earthquake Research Institute, University of Tokyo In Collaboration with: Alessandro Bertolini (Universita di’ Pisa) Riccardo DeSalvo (California Institute of Technology) Compact Tiltmeter with Folded Pendulum
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3/24/2004 Broadband Seismometer Workshop, Lake Tahoe 1 Akiteru Takamori Earthquake Research Institute, University of Tokyo In Collaboration with: Alessandro.
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3/24/2004 Broadband Seismometer Workshop, Lake Tahoe 1
Akiteru Takamori
Earthquake Research Institute, University of Tokyo
In Collaboration with:Alessandro Bertolini (Universita di’ Pisa)
Riccardo DeSalvo (California Institute of Technology)
Compact Tiltmeterwith
Folded Pendulum
3/24/2004 Broadband Seismometer Workshop, Lake Tahoe 2
3/24/2004 Broadband Seismometer Workshop, Lake Tahoe 7
Optical Transducer
Optical Lever / Fiber PhotointerrupterTarget Sensitivity: 10-10 m (cf. Laser IFO 10-11 m
)Light Source: Laser or LED?
− Power Loss in Fiber vs. Available Power− Coherent Length affects sensitivity?
Produces Linear Signal− Defines Unique Operating Point
Requires some R&D Effort− Intensity Modulation− Drift of Fiber Position?
Key Technologies
3/24/2004 Broadband Seismometer Workshop, Lake Tahoe 8
Optical Actuator
Wireless Electro-Magnetic ActuatorUtilizing Si Solar Cell
− Directly Connected to Voice CoilFully Passive Components near InstrumentElectro-Magnetic Interaction
− ~ few mA, mN Force Easily AchievableSufficient to Control Small FP
− Strong Dependency on Temperature
Requires External Calibration on Site− Photon Drive?
Key Technologies
3/24/2004 Broadband Seismometer Workshop, Lake Tahoe 9
Summary
Key Technologies and Scientific GainCompact & Precise Low Freq. Mechanics⇒ Allow Instrum. to Fit Tight Space (ex. Boreholes) Achieve High Mobility Realize Nearly Identical InstrmentsOptical Link⇒ Reliable Operation at Remote Sites / in Hazardous E
nvironmentOptical Transducer & Actuator⇒ Passive and Reliable Calibration on the Site: Photon Drive