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转矩测量传感器的输出信号与被测参数间存在非线性。为使转矩测量仪直接显示被测参数并提高测量准确度 ,在仪器自带单片机内装入相应软件 ,对传感器的非线性进行校正。 相似文献
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针对示波器在测量被测参数值后,一般只显示参数的数值而不会同时显示出该参数的其它物理特性这一问题.采用在参数测量的软件中定义指示器这一方法,使DSO在参数测量中不但能够显示所测电信号的测试值,而且也能够同时显示参数的具体物理意义.指示器基于C语言编程实现,利用硬件采集的波形数据点计算出参数测量的基本参数后,根据所测参数的物理定义确定测试点并存入指示器指针,最终显示出波形的参数测试值和代表参数物理意义的指示器直线.实验表明,DSO参数测量的界面能够实现图形化显示,方便测试人员快速查看所需数据. 相似文献
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本文介绍了DCS-B型多通道车用数据采集系统的硬件结构和软件处理方法及系统工作原理。该系统分为车用数据采集记录仪器和微机数据处理部分;仪器以单片机MCS-8031为控制核心,用多片62256加装后备电源为不掉电RAM与其它硬件电路组成,对特种车辆发动机实现33通道数据测量、显示和记录;仪器结构为便携式。数据打印和存盘由微机完成。被测参数的信号滤波、程控放大、非线性处理均由软件完成。该系统设计合理、工作可靠、使用方便。 相似文献
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结合某型高推重比涡扇发动机试车合测试系统的研制,介绍了该系统的技术指标、数据采集技术、显示技术和试车仿真原理。为提高系统测量精度和使用性能,提出并应用了测量参数非线性修正、多模式显示、实时发动机参数整理等技术。 相似文献
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存储测试的主要特点是测试仪器置于被测对象内部或被测环境中实时地获取动态参数,为了减小测试仪器对被测对象的影响,需要减小测试仪器的体积,实现测试仪器的微型化.针对存储测试仪器的微型化需求,提出利用SoC系统集成、模块化结构等技术,将数字电路的ADC模块、控制模块、存储模块、接口模块等集成在专用SoC芯片中,同时,将测试电路分为模拟电路、SoC数字电路、电池等模块,立体封装在机械壳体里,设计并实现了微型化的动态参数记录仪.基于SoC的微型化动态参数记录仪体积约10 cm3,可以嵌入被测体内或者置入被测环境中,实时获取相关动态参数.试验表明,基于SoC的微型动态参数记录仪可以用于应变、侵彻加速度、火炮膛内压力等动态参数的测试. 相似文献
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A method is proposed for estimating the parameters of a mixture of exponential and Weibull distributions for which the accuracy of preliminary estimates obtained by graphical analysis is refined in accordance with the criterion of maximum likelihood. The efficiency of the proposed method is supported by the results of statistical modeling. 相似文献
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An approximate analytical expression is derived for the velocity of the front of the wave of change of boiling modes on a
rod and on a plate. The impact of the Thomson effect and of the heater orientation in the gravity field is included. Adequate
agreement is demonstrated between the derived relations and experimental data. 相似文献
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Liebert A Wabnitz H Grosenick D Möller M Macdonald R Rinneberg H 《Applied optics》2003,42(28):5785-5792
A novel method for the determination of the optical properties of tissue from time-domain measurements is presented. The data analysis is based on the evaluation of the first moment and the second centralized moment, i.e., the mean time of flight and the variance of the measured distribution of times of flight (DTOF) of photons injected by short (picosecond) laser pulses. Analytical expressions are derived for calculation of absorption and of reduced scattering coefficients from these moments by application of diffusion theory for infinite and semi-infinite homogeneous media. The proposed method was tested on experimental data obtained with phantoms, and results for absorption and reduced scattering coefficients obtained by the proposed method are compared with those obtained by fitting of the same data with analytical solutions of the diffusion equation. Furthermore, the accuracy of the moment analysis was investigated for a range of integration limits of the DTOF. The moment analysis may serve as a comparatively fast method for evaluating optical properties with sufficient accuracy and can be used, e.g., for on-line monitoring of optical properties of biological tissue. 相似文献
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水三相点是开尔文热力学温度的唯一基准点,也是ITS-90国际温标重要的定义固定点。因此,水三相点不确定度分析对整个温标的建立、温度量值传递起着至关重要的作用。近3年来,中国计量科学研究院研制出一系列高质量的水三相点容器,加强了水三相点的研究,为不确定度的分析提供了更为可靠的实验依据。同时,不确定度的分析也是客观评价新研制容器性能的一个重要指标。因此,根据实验结果对新研制容器所复现的水三相点进行了不确定度评定。评定结果表明,其扩展不确定度为0.16mK(k=2.69,P=0.99)。 相似文献
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Conventional methods for summation of direct measurement errors are considered. Conditions under which these methods provide consistent results are stated. It is proposed to utilize for characteristic of the total error, its interval estimator or the half-sum of the value obtained by adding up its arithmetic and geometric random errors.Translated from Izmeritel'naya Tekhnika, No. 4, pp. 10–12, April, 1995. 相似文献