| 摘要 |
Simplification in manufacture and use of an optical triangulation probe is achieved by providing it with a T-shaped optical path. The cross-bar of the T-shape extends between a light source comprising a laser diode and a light detector comprising a photodiode array, while the stem of the T-shape contains a rod-shaped lens and prism arrangement. The cross-bar of the T-shape is occupied by a solid optical bar-shaped assembly comprising a number of blocks cemented together and providing reflective surfaces for directing outgoing and return light through the T-shape. The lens and prism arrangement focusses outgoing light from laser diode onto the surface of an object whose distance is to be measured and focusses reflected return light onto the photodiode array as a light spot. Position of the light spot as monitored by the output signal of a photodiode array is a measure of distance D between the object and the probe. The probe is for use in gas turbines for measuring clearances between rotor blade tips and turbine casings.
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