共查询到20条相似文献,搜索用时 78 毫秒
1.
波形测量中的基本问题讨论 总被引:6,自引:0,他引:6
简述了波形测量中的三个基本问题 ,波形获取、波形分析及波形表示 ,介绍了波形校准与波形测量的异同点 ,其根本不同在于是否已知目标波形的模型和参数。讨论并介绍了几种常见的简单波形的测量、分析、表述方法 ,特别提出了一种针对任意波形校准的解决方案。 相似文献
2.
3.
4.
模型化思想指导下的加速度传感器动态校准技术 总被引:2,自引:0,他引:2
本文简要回顾了近年来模型化方法在校准与测量中的发展情况,通过对加速度传感器动态校准的实例,说明了摸型化方法在加速度传感器动态校准方面的优点。 相似文献
5.
本介绍了一种对静态线性测量系统的线性度和温度效应进行补偿的模型化方法。使用多变量多项式回归模型表述静态测量系统的传递特性,以求获得对“线性测量系统”的精确描述,达到对其线性度和温度特性进行补偿,从而实现精确测量的目的。选用一个压力测量系统作为实验例证,验证了本所述方法的实用性和可行性。 相似文献
6.
本文介绍一种用轮计量法的船只过坝动态轨道称重系统的研制 ,该系统用轮计量法获取重量信号 ,用一种特殊的模型测量法处理重量信号 ;文中还介绍了系统软、硬件的组成和设计思路 ,介绍了系统标定的方法 相似文献
7.
仪器化压入测量中的计量研究是保证测试结果准确性和可靠性的基础.介绍了仪器化压入测量的计量研究概况,讨论了现有国际和国家标准中的关键校准参数和校准方法.在回顾仪器化压入测量发展历程的基础上进一步讨论了该技术的最新发展趋势,依托升温/降温测量、便携式测量和大通量测量等亟需要开展的相应计量研究工作来支持这些新测量方法的研究和... 相似文献
8.
对滚刀误差的CNC化测量进行了系统研究,着重阐述了柱坐标测量原理及其数学模型,并给出了利用CNC技术实现民误差测量时所涉及的测头运动的控制模型,最后介绍了实测结果。实际测量表明:滚刀误差用CNC化测量具有传统的机械式滚刀检查仪无法经拟的优越性。 相似文献
9.
10.
本文对应用较多的几种正弦波模型化测量方法进行了综述,它们是曲线拟合法、直方图统计分析法、FFT法和拍频法。较详细地介绍了这几种测量方法的典型用途以及特点,通过比较几种方法的优缺点,讨论了它们应用中的局限性。 相似文献
11.
The concepts of measurement accuracy and the reliability of the results of monitoring are discussed. A classification is proposed for the multiparametric monitoring of measurements in terms of the nature of the relationship between the monitored parameters. The results are given of investigations of the dependence of the probability of monitoring errors on the number of monitored parameters using the method of simulation modeling. 相似文献
12.
简要介绍了多路径信号建模技术的基本原理。水听器接收到的多路径声信号由一系列指数函数组成,通过数学变换推导得到多路径信号模型表达式,估算每个到达信号指数分量的频率、幅度和相位。由于多路径模型中第一个到达信号对应于直达信号,所以,感兴趣的参数是最先到达的稳态信号分量的幅度和相位。利用多路径信号建模技术得到换能器的发送电压响应,其测试结果与自由场稳态测试结果相比较,一致性很好,说明多路径建模技术是换能器低频校准的一个十分有效的方法。 相似文献
13.
14.
讨论了航空电子系统的含义,介绍了航空电子校准的内涵、范围、目的,讨论了航空电子校准的现状、发展目标。结合现状,对于航空计量部门介入航空电子校准,提出了几点原则和建议。 相似文献
15.
Thomas C. Larason Christopher L. Cromer 《Journal of research of the National Institute of Standards and Technology》2001,106(4):649-656
Increasing commercial, scientific, and technical applications involving ultraviolet (UV) radiation have led to the demand for improved understanding of the performance of instrumentation used to measure this radiation. There has been an effort by manufacturers of UV measuring devices (meters) to produce simple, optically filtered sensor systems to accomplish the varied measurement needs. We address common sources of measurement errors using these meters. The uncertainty in the calibration of the instrument depends on the response of the UV meter to the spectrum of the sources used and its similarity to the spectrum of the quantity to be measured. In addition, large errors can occur due to out-of-band, non-linear, and non-ideal geometric or spatial response of the UV meters. Finally, in many applications, how well the response of the UV meter approximates the presumed action spectrum needs to be understood for optimal use of the meters. 相似文献
16.
17.
基于国际计量委员会流体流量工作组流量领域关键比对的分类体系, 统计了流量领域校准与测量能力(CMC)总数排名前十经济体的校准与测量能力,对各经济体的流量计量基准、标准装置的测量原理、测量范围、标准相对不确定度等进行对比分析,得到各经济体流量领域的校准与测量能力分布和发展现状。针对我国流量领域的CMC现状,提出未来研究方向,为我国流量领域的校准与测量能力复评审提供支撑。 相似文献
18.
19.
E. L. Sensintaffar S. T. Windham 《Journal of research of the National Institute of Standards and Technology》1990,95(2):143-145
Zinc sulfide coated scintillation cells are the primary method for measuring radon-222 at the U.S. Environmental Protection Agency (EPA), Office of Radiation Programs (ORP), Eastern Environmental Radiation Facility (EERF). These cells are used to measure concentrations of radon in exposure chambers that are used to calibrate or test other devices or instruments. Individual cells are calibrated by analyzing samples of air with known concentrations of radon produced by emanation of radon from standard radium-226 solutions obtained from the National Institute of Standards and Technology. The calibration procedure includes ingrowth of radon-222 into equilibrium with the radium in the standard solution, transfer from the solution into an evacuated container, and dilution with a measured volume of air. Samples of the radon in air mixture are transferred to evacuated scintillation cells and sealed for 4 h prior to counting, which allows secular equilibrium to be established between the radon and its decay products.Calibration factors for each individual cell are computed by decay correcting the radon to the time of collection and calculating the ratio of count rate (cpm), corrected for background, to radon activity (Bq) for the specific volume of the cell. Four or more calibration factors are determined for each cell and aver-aged to provide the calibration factor used for measurements. Calibrations are repeated at 6-mo intervals, and the results of each calibration are compared to the previous averages. When calibration factors fall outside the 95% confidence interval, they are rejected and the cell is checked for defects prior to recalibration. 相似文献
20.
本文根据笔者服务业标准化试点技术支撑的工作经验,从组织机构建设、标准体系构建、标准的编写、标准体系的实施与改进等方面总结了试点创建的工作要点,分析了服务业标准化试点目前存在的问题,并针对问题给出了对策和建议。 相似文献