| 摘要 |
An apparatus for measuring interior profiles of enclosed spaces such as railway tunnels through optical means, achieves greater speed and precision than hitherto known apparatus by using a continuous collimated band of light together with means for maintaining the light band at a constant angle of incidence with the profile to be measured and means for detecting variations of the vertical angle of the light source while the light source and an associated image analyser are moved through the enclosed space.
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