| 摘要 |
An attitude sensing apparatus for detecting a tilt angle and an azimuth angle of the tilt of a structure includes a pair of detecting devices disposed on the structure at right angles to each other. Each of the detecting devices consists of a rotary shaft rotatably supported from a structure to be measured, a sensor support integrally held by the rotary shaft and biased in the vertical direction by gravity, a tilt angle sensor supported by the sensor support for detecting a tilt angle of the sensor support within a plane containing the axis of the rotary shaft, and a controller for controlling rotation of the rotary shaft with respect to the structure. The apparatus also includes a calculator which calculates a maximum tilt angle and an azimuth angle thereof of the structure on the basis of tilt angles detected by the two tilt angle sensors. This calculation is simply and rapidly effected according to approximating formulae, and yet at a good precision.
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