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自制了一套电容位移测量仪的校准装置,并对DWS型电容位移测量仪进行了校准和标定,使位移测量仪在较宽的量程范围内获得的悬臂梁位移测量值的误差≤5%。通过采用经改进校准和标定的位移测量仪,利用悬臂梁-电容法测定了稀土超磁致伸缩薄膜样品的磁致伸缩系数λ,提高了测量精度。 相似文献
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在立式光学计上测量滚动轴承滚针直径,利用量块尺寸作为标准,将测量装置调整为零位,然后测出滚针与量块标准尺寸的差值,求出被测滚针的直径尺寸。分析了温度误差、测量力误差、示值误差、标准量块极限误差、测量重复性和测量装置定位误差等对测量装置不确定度的影响,并给出了相应的不确定度的计算公式。 相似文献
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激光干涉仪具有测量分辨力高、测量结果可溯源等优点,在纳米测量中的应用日益广泛。介绍纳米测量机和低膨胀材料线膨胀系数测量装置中应用的迈克尔逊型激光干涉仪以及在高准确度位移测量装置中应用的法布里-珀罗型激光干涉仪,并结合这些实例对激光干涉仪光学系统设计、测量环境控制、迈克尔逊干涉仪非线性误差补偿以及法布里-珀罗干涉仪量程扩展等方面的关键问题进行分析和总结。所述原则和方法对实现纳米级测量准确度具有重要意义,可为高准确度激光干涉仪的研制及其在纳米测量中的更广泛应用提供技术参考。 相似文献
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为满足实验室纯水机内置在线监测仪表的现场校准需求,建立了一套由高精度电导率仪、总有机碳分析仪和可调流速缓冲装置组成的标准测量装置。通过将纯水机在线监测仪表的测量结果与标准测量装置的测量结果进行比较,实现了纯水机在线电导率/电阻率和总有机碳监测仪表的现场校准。对11家实验室纯水机进行现场试验和分析。结果表明:纯水机在线电导率仪器相对示值误差在-2.4%~15%,测量扩展不确定度为1.7%(k=2);总有机碳仪器相对示值误差为-98%~125%,测量扩展不确定度为4.8%(k=2)。 相似文献
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In this research, a dynamometer was designed, constructed and calibrated to measure the forces and moments applied on tillage implements. This dynamometer is able to measure the three orthogonal forces acting on the implement and the three moments acting around the orthogonal axes, up to a maximum force of 20 kN and a maximum moment of 20 kN m. The dynamometer uses two extended octagonal ring transducers mounted in a back-to-back arrangement with their axes at right angles and has a tubular torque meter for torque measurement. For mechanical design of the dynamometer frame and its units, the finite element method and CATIA software were used. The device was machined from the solid part and high tensile steel. The forces and moments acting on the dynamometer were measured by using the strain gauge bridges on two extended octagonal ring transducers and on the torque meter tube. The results of data analysis, including forces applied on the dynamometer, the designing method of rings and torque meter tubes, the mounting arrangement of load cell parts on each other, the mounting method of load cell on frame and the position of strain gauge on load cell, in other words, the position of different parts of the dynamometer relative to each other has been explained in this paper. Calibration of the measurement unit was done by a calibration system which was designed for static calibration of the triaxial dynamometer. The results of calibration of the measurement unit showed that the designed and constructed dynamometer has appropriate precision, sensitivity and good repeatability for measuring the desired forces and moments. The results showed a high degree of linearity between output voltage of bridges and applied forces and moments. The interaction effects of the applied forces and moments were very negligible. 相似文献
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针对低温液位传感器校准装置的夹具端空间姿态问题,提出了一种基于多边法原理的误差辨识方法。利用激光跟踪仪测距精度高的特点,采用多边法原理对校准装置夹具端的运动轨迹进行标定,以重力加速度方向为Z轴反方向建立虚拟坐标系,利用刚体中两点位置始终不变的特性,获得被测点6项误差的冗余数据,实现校准装置几何误差的辨识。仿真结果表明,所提出的方法具有一定的可行性,采用遗传算法与信赖域法、Guass-Ne叭加法相结合的方法,在一定程度上避免因初值难以确定造成的数据不收敛问题。 相似文献
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复合校准技术是武器装备型号项目中使用的高精度惯性器件校准的核心技术,能够在实验室模拟惯性器件“真实”的使用环境。本文针对在离心-振动条件下的加速度计复合校准问题,从系统中存在的动不平衡问题出发,建立了离心-振动复合模型并讨论了在顺臂安装和垂直安装下受到的加速度大小,给出了整个校准系统的不确定度分析。最后基于离心-振动复合校准装置进行实验验证,证明了本文所设计的校准装置和校准方法能够模拟真实的校准环境,提高校准精度。 相似文献