LIGO Document G1300428-v1

A High Precision Mechanical Ground Tilt Sensor.

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The next generation of gravitational radiation detectors will employ
sophisticated isolation systems to attenuate seismic noise and achieve
usable sensitivity at frequencies as low as 10 Hz. This requires tight
control of displacement at a sub-Hz level, which is difficult due to
confusion between tilt and acceleration in linear seismometers and
accelerometers. To aid in this effort we are presenting a general purpose high sensitivity sensor capable of measuring ground tilt at
6e-9 rad/sqrt(Hz) at 10mHz and an order of magnitude better at 100mHz. We will discuss tiltmeter design and paths to improving
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