共查询到18条相似文献,搜索用时 171 毫秒
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为了解决手持式激光测距仪50m以上检测基准建立的问题,在50m高精度导轨上利用3个平面反射镜进行光路折叠,实现4倍光程倍增,搭建了室内200m基线。并将Leica TS15型全站仪视为检定基准,对基线长度进行标定。最后对Leica DISTOTM D510型手持式激光测距仪开展了50~200m测段的示值误差检定实验。实验结果表明: 室内基线系统的测量范围可拓宽至200m,示值误差检定结果的扩展不确定度为2.2mm(k=2),满足检定规程要求,有利于将长基线压缩至室内有限空间完成。 相似文献
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现行的GB/T 16789-2019《比长基线测量规范》规定全站仪测距长度基线场采用因瓦基线尺测量的方法进行检定,其过程繁琐,且成本较大.通过对激光跟踪仪距离测量精度的分析和检测实验结果,对比了同一个标准基线场分别利用激光跟踪仪测量和因瓦基线尺测量的结果及其若干项精度指标,以及通过对比用两种基线长度分别计算出的若干台高精度智能型全站仪的加乘常数及其中误差,论证了激光跟踪仪的长度测量精度是可以满足全站仪测距长度基线场检定的要求,且精度比因瓦基线尺测量的结果更高,测量效率也大为提高. 相似文献
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结合机载双天线干涉合成孔径雷达(InSAR)正侧视成像模型,分析了机载双天线InSAR数据处理中存在的影响数字高程模型(DEM)高程精度和点位精度的主要因素,包括平台高度、斜距、干涉相位、基线长度、基线倾角、中心多普勒频率以及载机姿态,着重分析了平台高度、基线长度、基线倾角以及侧视角等因素的变化与DEM误差之间的关系.选用机载双天线InSAR数据进行了干涉实验,并对生成的DEM进行了误差分析,实验分析结果和误差定量分析的结果相一致.对机载双天线InSAR数据处理进行误差分析有利于提高DEM的高程和点位精度,也有利于机载双天线InSAR系统设计及飞行试验设计,因而具有重要实用意义. 相似文献
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基准尺作为摄影测量长度基准,其精度直接影响测量结果的准确性,为了保证基准尺长度的测量精度,设计了由气体静压导轨、激光干涉仪、CCD成像系统组成的测量系统。分析了影响测量精度的因素,并对组成基准尺的标志圆成像位置、CCD相机光轴、激光干涉仪、基准尺和CCD成像系统绕自身光轴旋转的调节误差进行了计算分析,用于指导CCD成像系统、激光干涉仪和基准尺的调节。最后应用该系统对基准尺进行多次测量,结果表明基准尺长度测量的标准差可达到1 μm,满足工业摄影测量的要求。 相似文献
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This study introduces the development of a hybrid measurement system integrated on a machining centre to carry out the possible intermittent measurement of a workpiece. The developed hybrid measurement system principally consists of a MP10 touch trigger probe system, a circular triangulation laser probe system, and the measurement software. The touch trigger probe system was primarily used to measure the regular geometric features, whereas the circular triangulation laser probe system was adopted to inspect the freeform surface part of a test carrier with the help of the developed measurement software. An adjustment device consisting mainly of an adjustment unit, a joint unit, and an assembly unit, was designed and manufactured to minimize the cosine error caused by the assembly inaccuracy for the laser probe. The measuring uncertainty analysis experiments for both the touch trigger probe system and the non-contact laser probe system were investigated by using a calibrated standard sphere and the HP5529A laser interferometer system, respectively. The information in the whole measuring system – which comprised a personal computer, a CNC machining centre controller, a Renishaw MP10 touch probe system, and the controller of a Wolf & Back OTM3A20 circular triangulation laser probe system – was integrated technically. The measurement software was also developed to simulate the measuring path, prevent collision, and generate the corresponding measuring NC codes. The developed system can also be used to digitize the data points of a 3D small complex workpiece, such as a tooth model and an IC part. A carrier, combined with free form surface and regular geometric feature referred to in the ISO 10791-7 cutting test standard, was designed, manufactured and inspected in order to evaluate the performance of the developed hybrid measuring system. The measurement results of this carrier were verified through a CNC coordinate measuring machine, with satisfactory consistency. According to the measuring results, the developed hybrid measuring system was successfully and effectively used to carry out the intermittent measurement. 相似文献
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目的 为提高M型预制袋包装机袋口折合机构轨迹输出点的运动精度,对袋口折合机构进行运动精度可靠性优化。方法 在运动学分析的基础上,用环路增量法建立考虑杆长误差时袋口折合机构的位置误差模型,接着对轨迹输出点进行可靠性分析及蒙特卡洛法验证,通过灵敏度分析确定关键误差影响因素,最后进行运动精度可靠性优化。结果 建立的可靠性模型可以有效地反映杆长误差对机构运动精度的影响,x分量轨迹的可靠度由82.5%提高至92.91%,y分量轨迹可靠度由65.34%提高至89%。结论 经过可靠性优化能够使袋口折合机构运动精度满足设计要求。 相似文献
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Fujii K. Williams E.R. Steiner R.L. Newell D.B. 《IEEE transactions on instrumentation and measurement》1997,46(2):191-195
A new refractometer with a variable length vacuum cell has been developed to eliminate errors caused by deformations in optical windows of the cell. The refractive index of air is determined by measuring the changes in the optical path difference between the air of interest and a vacuum as a function of the changes in the cell length. An optical phase modulation technique and a dark fringe detection method are used to obtain a high resolution in measuring the optical path difference by a double-pass Michelson interferometer. A combined standard uncertainty of 5×10-9 in the measurement of the refractive index of air has been achieved 相似文献