POSITION MEASUREMENT BY LASER BEAM
专利汇可以提供POSITION MEASUREMENT BY LASER BEAM专利检索，专利查询，专利分析的服务。并且A laser beam from a source (20) is used to provide a reference in space adjacent a portion of a structure movements of which are monitored. The beam is received by a receiver (30). A number of targets (300) may be mounted to move with parts of the structure extending alongside the beam path. Target constructions (Figs. 6-8) are described which allow for normal passage of the beam past the target but which enable the position of the beam relative to a given target to be measured by intercepting the beam. In a variation (Fig. 13) for civil engineering use, a single target is selectively mountable to one of a number of supports. Another variation (Fig. 11) uses graduated mesh targets on which the beam impinges on each mesh but is alo transmitted through the mesh. Dynamic movement of a part of structure such as a bridge is measured with a single target attached to the part in question and comprising a barred reflective assembly (Fig. 3), a fibre optic array (Fig. 4) or a position sensing photo-diode (Fig. 5). For use in such systems there is also described a spatial filter for a laser receiver (Fig. 10), a laser assembly adapted for precise re-positioning (Fig. 9) and a dust excluding laser housing (Fig. 12).，下面是POSITION MEASUREMENT BY LASER BEAM专利的具体信息内容。
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