为解决目标点在空间移动时位移测量的难题，设计开发出一套空间位移测量系统。测量系统以LabVIEW作为软件开发平台，使用3个拉线式位移传感计、美国恩艾公司的USB数据采集卡作为硬件设备，以三站式空间定位算法作理论依据进行位移测量和数据计算。测量算法可靠、实用，在确定站点信息后（两站之间长度），系统能根据3组不断变化的拉线长度数据，实现对目标点在空间内位移的测量，得到x、y、z3个维度上位移数值，并且在系统软件界面中实时显示目标的空间变化。试验结果表明：本系统具有结构简单、容易实现、显示直观、精度较高等优点，具有很好的实用性。%A spatial displacement measurement system has been designed and developed for spatial displacements of target point. The measurement system took LabVIEW as software development platform and three guyed displacement meters and USB data acquisition card of USA Enai Company, which can proceed displacement measurement and data calculating based on theoretical basis of three-location space location algorithm. The measuring algorithm is feasible and reliable. The system can realize the space displacement measurement for target point according to three groups of changing line length data after confirming the location information (length between two locations), so as to obtain the 3D position. Besides, the space variations of the target were displayed in real time on software interface of system. The test results show that the system has many advantages such as simple structure, easy achievement, intuitive display and high accuracy, which make it a very useful tool.
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