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Mechanical monolithic horizontal sensor for low frequency seismic noise measurement
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View: Figures


Image of FIG. 1.
FIG. 1.

FP mechanical model.

Image of FIG. 2.
FIG. 2.

Eigenfrequencies and the first principal stress of the hinge as function of the hinge ellipticity, .

Image of FIG. 3.
FIG. 3.

Simulation of elliptic hinges using COMSOL© simulation program.

Image of FIG. 4.
FIG. 4.

Picture of the monolithic FP sensor. On the sensor right side there is the pendulum and the mirror for the optical readout system mounted on the central mass. On the sensor left side there is the inverted pendulum and a recess where it is possible to place the coil-magnet actuation system for the implementation of the FP control when the sensor is used as an accelerometer. The calibration masses are placed on the central mass. The homodyne Michelson interferometer is shown on the right.

Image of FIG. 5.
FIG. 5.

Optical scheme of the implemented readout system.

Image of FIG. 6.
FIG. 6.

Displacement of the monolithic FP central mass with a laser interferometric readout.

Image of FIG. 7.
FIG. 7.

Transfer function measurement of the FP.

Image of FIG. 8.
FIG. 8.

Measured natural resonance frequencies of the monolithic FP sensor prototype. The best measured frequency, , is circled.

Image of FIG. 9.
FIG. 9.

Theoretical and experimental noise curves of the monolithic FP sensor prototype with optical lever and laser interferometric readouts.

Image of FIG. 10.
FIG. 10.

Example of earthquakes recorded by the tunable mechanical monolithic seismometer.


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Scitation: Mechanical monolithic horizontal sensor for low frequency seismic noise measurement