共查询到20条相似文献,搜索用时 51 毫秒
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从弥补仪器的缺陷和不确定度评定出发,得出减小测量误差的常用测量方法有:替代法、对称观测法、补偿法、差值法、交换法和累计放大法。 相似文献
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本文分析了旋转测磁仪的振动和测磁线圈偏心、振动等因素对测量精度的影响.结果表明这些因素对测量精度的影响不容忽视. 相似文献
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可忽略自变量测量误差的判断条件 总被引:2,自引:0,他引:2
在物理实验中,对组合测量而得的n个数据点(x_i,y_i)用直线方程y=A+Bx进行拟合时,通常需假设自变量x为无误差(或小误差)测量,而因变量y为等精度测量。在什么情况下我们只需考虑因变量的测量误差,而可忽略自变量的测量误差呢? 首先,用x、y,各自的测量标准误差σ_x、σ_y作为判断量直接进行比较大概是不行的,因为它们的量纲一般不同,数值大小也可随度量单位的扩大(或缩小)而缩小(或扩大),根本无法直接比较它们的大小。其次,用x、y各自的测量标准误差与平均值之比σ_x/(?)、σ_y/(?)作为判断量进行比较,大概也是不行的,这是因为当度量单位 相似文献
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本文利用红外热像仪测温系统,系统地对三种典型的航天用功率器件进行了测试和分析。研究结果对功率器件可靠性分析具有重要的作用。同时对功率器件进行了数值模拟,在定性方面可为器件的热设计提供改进方向和合理方案。 相似文献
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Because of field inhomogeneity in the magnetization measurement system, large errors may exist in the decreasing field superconducting magnetization curves, but not in the increasing field curves. The physical origin of the large errors is proposed here. A simple formula for calculating the errors is given. This formula is consistent with the experimental data. 相似文献
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本对气轨实验的实验误差进行剖析与讨论,并对影响实验的粘滞力和平均速度V↑-代替瞬时速度V计算加α带来的误差进行了修正。 相似文献
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Wenqin Wang 《International Journal of Infrared and Millimeter Waves》2006,27(11):1433-1444
In remote sensing applications, there is a special interest in the lightweight, cost effective, and high resolution imaging
sensors. The combination of linearly frequency modulated continuous wave (LFMCW) technology and synthetic aperture radar (SAR)
technique can lead to such a sensor. This paper concentrates on the analysis of waveform errors in millimeter-wave (MMW) LFMCW
SAR. The generating scheme of millimeter-wave LFMCW waveforms with phase locked loop (PLL) and direct digital synthesizer
(DDS) combined frequency synthesizer is investigated. The impacts of quantization errors, spurs, and frequency nonlinearities
are analyzed. Simulation results show that the quality of LFMCW waveforms has a direct influence on the SAR images. Hence
a scheme of frequency synthesizer to achieve high performance MMW LFMCW waveform is proposed. This synthesizer driven by a
DDS array can adaptive suppress the spurious level without degradation of excellent frequency linearity and fast switching
speed. 相似文献
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