| 摘要 |
A spacer device for laser-optical measurement of hollow cylinders has at least two, preferably three arms which are coupled or interlaced with one another and which can be moved relative to one another. Each of the arms has a measurement roller on one end which is brought into contact with the inner surface of a hollow cylinder to be measured and which can be rolled thereon, if necessary. An instrument platform is attached to the spacer device so that a light emitter (e.g., laser) and/or receiver or reflector can be attached at the central position of the instrument platform. The device is used to determine the three-dimensional position of the hollow cylinder to be measured.
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