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A simple pendulum borehole tiltmeter based on a triaxial optical-fibre displacement sensor

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Academic year: 2021

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Figure

Figure 1. Optical borehole tiltmeter design. (a) general view of the instrument including outer and inner cylinders
Figure 2. Representation of the pendulum when the bob is moving due to a rotation  of the referential (P, x, y, z)
Figure 4. The extrinsic fibre Fabry-Perot interferometer. The main beam I i
Figure 5. Front view of the tripod holding LINES-OBT. Silica beads ensure coupling between the tripod and the tiltmeter
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