| 摘要 |
One or more tangential bores communicating with the clearance between a rotor or a shaft and the adjacent machine casing are provided, so that light beams may be projected through the clearance to measure the clearance and to detect variations therein, as measured by the amount of light that passes through the clearance. Observation of the clearance at two or more positions distributed about the circumference of the rotor makes it possible to determine the behavior of the rotor and its shaft. Axial clearance is similarly determined for observation of axial displacement or vibration. Observation of radial clearance may also be made with axially distributed measurements. Pressure seals and mirrors for the light channels are shown. For small clearances, the use of a laser as a light source is desirable.
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