| 摘要 |
A laser-optical apparatus for measuring blade tip clearance, e.g. of a compressor or gas turbine, uses a laser beam, fiber optics, a light probe and electrical circuits (14, 25) for processing data from the probe, and includes a light probe (16) having a lens (17) for making parallel a light beam from the optical fiber cable (15) for illumination, a half-mirror (18) for separating illuminating light and reflected light, a movable lens (19) for adjusting focus of the light beam on the object (12), an object lens (21), and a lens (22) for collected reflected light from half-mirror (18) and directing it to an entrance to the optical fiber cable (24) which transmits received light to the light reception circuit (25). The method for measuring blade tip clearance includes focusing a parallel light beam from a laser source (14, 15) through a half-mirror (18), adjustable lens (19) and object lens (21) onto an object (12), adjusting the focus by oscillating movement of the adjustable lens, detecting the reflected light received, and determining the tip clearance from the position of the adjustable lens at the time the reflected light is at a maximum value.
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