Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-12-06
1991-05-21
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356375, 2502014, 350255, G01N 2186
Patent
active
050177966
ABSTRACT:
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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Transactions of the ASME/Journal of Engineering for Power, Apr. 1981, vol. 103, pp. 457-460.
Messinger Michael
Mitsubishi Jukogyo Kabushiki Kaisha
Nelms David C.
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