共查询到20条相似文献,搜索用时 15 毫秒
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二维自跟踪视觉准直测量系统 总被引:2,自引:0,他引:2
为了提高自准直仪的测量精度和降低人眼瞄准的劳动强度和主观误差,提出一种基于机器视觉的二维自跟踪视觉准直测量系统。该系统由光学准直仪、CCD和图像采集卡等组成。以面阵CCD代替人眼对自准直仪的十字分划板图像进行瞄准;采用图像不变矩自动搜索算法和hough变换、亚像素细分等方法实现对小角度的自动精确测量。实验结果表明,该系统测量范围达到±15',最小分辨力优于0.1″,与MJS双频激光测角系统比对误差在0.6″以内,测量精度高于MJS,而且操作方便,易于推广。 相似文献
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A system for automatic null ellipsometric measurement, which uses a new kind of achromatic rhomb-type lambda/4 retarder, is designed and constructed. By use of terbium glass as the modulator's material, a magneto-optical modulator and its driving circuit are constructed. The polarized light is modulated by dc and ac. Combined with an ultra-low noise frequency-selective amplifier and a lock-in amplifier, the null time of the mechanical and photoelectric automatic null system can be less than 15 s. After the error of the mechanical parts is excluded, the repeatability standard deviation S4 of nulling angles can be less than 0.00025 deg. 相似文献
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激光跟踪仪系统测量不确定度预测方法研究 总被引:2,自引:0,他引:2
针对测量系统的测量不确定度预测问题,将现代信息论的思想应用于激光跟踪仪测量系统的测量不确定度分析与预测中,采用现代信息论中的时间序列自回归模型(AR模型)建立测量系统不确定度预测模型,揭示测量系统的结构与规律,对测量系统进行预测分析,提高测量系统的测量精度.通过建立基于AR模型的激光跟踪仪测量系统的测量不确定度预测模型,对激光跟踪仪系统的测距误差进行了预测分析.仿真实验表明,基于AR模型的测量系统的测量不确定度预测模型具有良好的精度,而且该模型预测分析数据具有可靠性. 相似文献
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一种星敏感器安装误差自动化测量方法 总被引:1,自引:0,他引:1
针星敏感器安装误差的精确标定,该文提出基于平台式惯性/星光组合导航系统中,星敏感器相对惯性坐标基准的安装误差自动化测量方法。首先基于光电自准直仪测量方式,建立安装误差测量的数学模型,并通过仿真验证模型的有效性。开发一套自动化测试系统,利用高精度的光电测角仪模拟星光,将星敏感器主光轴对准星点,输出星点坐标信息,自准直仪测量标准六面体的姿态,通过与星敏感器坐标对比和软件自动解算得到星敏感器相对标准六面体的安装误差。试验数据能达到5″内的测试稳定精度,证明该方法可准确测量出星敏感器的安装误差,且测试稳定性好,已应用于工程精密测量。 相似文献
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针对试飞光电测试中目标运动轨迹姿态自动化测量的问题,提出一种基于空间拓扑关系的目标自动识别跟踪与位姿参数同步测量技术。首先通过对被测目标表面的圆形标志点密集布设、目标运动过程的图像高速采集、圆形标志点不同视角下的自动精确提取,实现目标的自动检测;之后基于多点空间拓扑关系进行同名像对的匹配,并结合双摄像机的标定参数进行前方交会测量,实现目标表面标志点的三维重建;再采用基于多点空间拓扑约束、点距判定以及坐标旋转平移变换算法的点云块配准方法,实现目标自动跟踪与运动过程的轨迹姿态参数测量。试验证明:该方法切实可行,可获得亚毫米级的定位精度和优于0.11°的定姿精度,且能够全自动处理,从而大大提升试飞测试中影像测量的数据处理效率,同时可为飞行影像数据自动化、实时化处理提供一种有效技术手段。 相似文献
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跟踪测量视频的高精度同步采集系统 总被引:1,自引:0,他引:1
设计了一种无损实时跟踪测量视频和测控数据同步采集系统。根据测控信息同步信号及其对视频采集时刻的规定,以测控信息采集卡上高精度定时器为时钟,由视频采集卡通过软件修正摄像机曝光信号,实现对曝光时刻的精密调节。采用高速总线实现数据无失真存储和转储、AVI技术组织文件,充分利用了测量视频图像空间。 相似文献
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D. V. Petrov V. A. Vesnina L. N. Butenko I. V. Shkol'nikov Yu. A. Stepin Yu. M. Golubovskii 《Measurement Techniques》1989,32(12):1143-1145
Translated from Izmeritel'naya Tekhnika, No. 12, pp. 12–14, December, 1989. 相似文献
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An automatic procedure for X-ray line profile Fourier analysis is described. The Fourier coefficients were computed by the Stokes method and the real parts were used as input data to the Warren-Averbach method, which separates the line broadening due to particle size from that due to microstrains and/or to stacking faults. With the present system all calculations and plots are performed by an appropriately coded minicomputer on-line interfaced with a linear X-ray diffractometer. This system was tested in two different applications. Cu filings (cold-worked) that give two first and second-order diffraction lines, and CdS thin films, prepared by sputtering, which give a single measurable reflection. In this case the Warren-Averbach method was partly modified. The particle size, microstrains and stacking fault probabilities were determined and the results are discussed. 相似文献
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Spectroscopic measurements at low temperature require liquid nitrogen in some type of research dewar. Often the research dewar must be refilled from a reservoir dewar several times during the course of an experiment. A system is described which automatically refills a research dewar from a reservoir dewar. Two sensors are used for detecting the liquid nitrogen level in the research dewar, and an external nitrogen gas supply is used to provide the pressure to effect the transfer of liquid nitrogen. 相似文献
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Translated from Izmeritel'naya Tekhnika, No. 3, pp. 35–36, March, 1990. 相似文献