Measurement of large internal diameters with a compact apparatus based on dual-wavelength heterodyne interferometer |
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| Authors: | Bin Li Jin-wen Liang |
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| Affiliation: | ∗Department of Mechanical Engineering, Southeast University, Nanjing, China;†Department of Precision Instruments, Tsinghua University, Beijing, China |
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| Abstract: | This paper presents a new method for measuring large internal diameters of 3∼20 m with submillimeter resolution. The method is based on a novel dual-wavelength heterodyne interferometer for absolute distance measurement and a new positioning method for aligning the laser beams with the diameter of the bore to be measured. The compact apparatus and convenience of operation in situ are the distinguishing features of this method. Preliminary experimental results of the prototype of the apparatus proved the feasibility of this method. |
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| Keywords: | measurements large internal diameter dual-wavelength heterodyne interferometerl positioning |
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