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This paper presents a tilt sensor using two orthogonally arranged micro accelerometers. The arctangent function arctan(a2/a1) instead of the traditional arcsine function arcsin(a2/g) or arcsin(a1/g) is used to solve for the tilt angle. As a result, the tilt angle measurement is kept in the maximum value with a constant sensitivity (17.45 mg per degree) in the full measurement range.
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