一种基于MATLAB的植物叶片参数测量系统

提出了一种基于MATLAB的植物叶片参数自动测量系统方案.该系统利用扫描仪获取包含标定物的叶片图像,对其二值化后进行边缘跟踪,获得标定物和叶片的边界,最后借助标定物的实际直径和面积得到叶片的面积、周长、长、宽等参数.经对两种叶片进行的实验.结果表明,此系统能够快速、准确地进行叶片参数的自动测量,具有较高的效率和实用性.     

一种基于参数的计量管理方法探讨

通过对传统计量管理工作的分析,提出了一种新的能够满足工程实践的计量管理思路,探索一种能够切实保证工程实践中测量结果准确、可靠的计量管理方法.     

按模拟示波器检定方法评价数字示波器的若干问题探讨

本文按模拟示波器的检定方法对数字示波器的垂直幅度参数,扫描时间参数和脉冲测量功能评价方法进行探讨,以为数字示波器评价测试提供参考。     

一种利用S参数测量平衡RFID标签天线阻抗的优化方法

针对测量平衡RFID标签天线阻抗的准确性问题,提出了一种利用s参数测量的优化方法。该方法将平衡RFID标签天线等效为双端口网络,通过联合使用端口短路、开路延伸方法测量S参数,根据拐点选取最邻近数据并进行区间的数据拟合,从而计算出天线阻抗。首先 h1 进行了测量理论分析．然后设计了实物测量场景（915MHz频段的RFID天线）,并将该优化方法与传统的Bahm方法、无延伸单端口方法、延伸单端口方法进行了对比。结果表明,在工作频段内,该优化方法所测的标签天线的阻抗实部,虚部与仿真结果基本一致,比传统的Balun2及单端口等测摄方法准确;在工作频段外,所测阻抗实部仍然与仿真结果接近,尽管阻抗虚部与仿真结果存在一定的偏差。     

海洋环境参数测量系统的检测方法研究

在简要介绍了典型海洋环境参数测量系统的组成基础上,详细介绍了测量系统的现场检测技术和验收方法,实际使用表明,这些检测方法,对于设备性能的检验和有效使用提供了可靠的保障。     

用消光式椭圆偏振光谱测量薄膜光学参数的方法

本文主要介绍如何应用 TP—77型椭偏仪与 WDF 反射式单色仪组合,实现不同波长下的消光椭偏测量。此方法可测量薄膜厚度、折射率、吸收系数等光学参数。     

一种多参数示波器自动检定装置设计

示波器的参数校准和检定是保证示波器高精度的重要操作,针对目前示波器计量检定效率低、出错率高的缺陷,搭建了一套多参数示波器自动检定装置。装置上位机是基于LabVIEW进行开发设计,下位机由FLUKE 5820A示波器校准仪、PM6685R频率计组成。分析了检定装置的工作原理,阐明了硬件搭建方案及软件设计流程。利用该装置对10台模拟及数字示波器进行了多参数检定,检定结果表明,该系统将检定效率提高50%以上,可以实现示波器的自动检定。     

改造表面粗糙度轮廓仪的单参数测量为多参数测量

对单参数(Ra)测量的表面粗糙度轮廓仪进行改造,通过接口与计算机相连,可实现多参数(Ra、Rz、Ry、S、Sm 和 tp)的测量。作者选用 PC-1500A 袖珍计算机,用机器语言编写采样程序,用 BASIC 语言编制运算程序,既达到了快速采样又使编程方便。     

A Bayesian method for robust tolerance control and parameter design

This paper proposes a Bayesian method to set tolerance or specification limits on one or more responses and obtain optimal values for a set of controllable factors. The existence of such controllable factors (or parameters) that can be manipulated by the process engineer and that affect the responses is assumed. The dependence between the controllable factors and the responses is assumed to be captured by a regression model fit from experimental data, where the data are assumed to be available. The proposed method finds the optimal setting of the control factors (parameter design) and the corresponding specification limits for the responses (tolerance control) in order to achieve a desired posterior probability of conformance of the responses to their specifications. Contrary to standard approaches in this area, the proposed Bayesian approach uses the complete posterior predictive distribution of the responses, thus the tolerances and settings obtained consider implicitly both the mean and variance of the responses and the uncertainty in the regression model parameters.     

量规刻线参数设计方法的改进

论述了刻线量规设计、制造，使用中存在的问题和改进方法，并介绍了以刻线中心为基准，以线深控制线宽的刻线方法。     

爆炸冲击波参数薄膜测试法研究

为可靠获取爆炸冲击波超压参数,设计一种铝箔薄膜结构进行实验。通过控制材料状态、结构频率特性等参数,使其满足一定毁伤准则,建立力学模型对其进行分析。利用激波管装置对薄膜变形进行标定,并将激波反射载荷转换为入射压,采用最小二乘法进行线性拟合,得到薄膜最大变形挠度与激波入射压峰值之间关系。结果表明,可通过铝箔薄膜最大变形挠度反映爆炸场中0.05~0.35 MPa范围内的入射冲击波超压,为冲击波测试工程应用提供新的途径。     

Auto-consistent environment for measurement software development

In a measurement environment, the user will repeatedly change some of the measurement settings and will want to view the results. Developers of elaborate measurement systems are often puzzled as to whether the generated results correspond to the latest settings. Data consistency in a measurement system means that displayed results will always conform to the latest settings. This paper suggests that automatic data consistency is an underestimated feature of dataflow environments. If only a few of the settings are modified each time, it is unreasonable to repeat operations that do not depend on the changed settings. A demand-driven execution scheme is presented in which data tokens are tagged with their time of calculation. This scheme avoids redundant operations without programmer intervention. This is an important concern when some real-time constraints are to be met, because the operations in complex measurement systems can be very time-consuming. When the developer must handle these two issues programmatically, their combination often results in unmanageable programs     

自适应MCM测量不确定度软件研发

蒙特卡洛法(MCM)测量不确定度评定中模型复杂、计算量大,现有软件往往只在某一模型中适用,不同模型间相互独立,且评定结果缺少自适应过程.基于LabVIEW软件生成输入量X的伪随机数,对X概率密度函数(PDF)离散抽样,得到输出量Y的离散抽样值,进而设计了自适应MCM测量不确定度软件.本软件实现了常用模型数学公式的自定义,增强了软件的适用性,同时重点介绍了自适应增加样本量M的算法.通过JJF1059.2-2012规范中实例的计算,验证了软件在常用模型评定中的有效性.     

Verification procedure for vibration parameter measurement devices

Translated from Izmeritel'naya Tekhnlka, No. 9, pp. 45–46, September, 1991.     

Multivariate tolerance design for a quadratic design parameter model

The determination of tolerance allocations among design parameters is an integral phase of product/process design. Such allocations are often necessary to achieve desired levels of product performance. Parametric and nonparametric methods have recently been developed for allocating multivariate tolerances. Parametric methods assume full information about the probability distribution of design parameter processes, whereas, nonparametric methods assume that only partial information is available, which consists of only design parameter process variances. These methods currently assume that the relationship between the design parameters and each of the performance measures is linear. However, quadratic response functions are increasingly being used to provide better approximations of the relationships between performance measures and design parameters. This is especially prevalent where there is a multivariate set of performance measures that are functions of a common set of design parameters. In this research we propose both parametric and nonparametric multivariate tolerance allocation procedures which consider the more general case where these relationships can be represented by quadratic functions of the design parameters. We develop the corresponding methodology and nonlinear optimization models to accommodate and take advantage of the presence of interactions and other nonlinearities among suppliers.     

Absolute lattice parameter measurement

Absolute lattice parameter methods are useful for determining alloy composition, understanding point defects and dopants in semiconductor substrate materials and for the evaluation of lattice relaxation in heteroepitaxial layers. This paper reviews the techniques available. The assumptions and uncertainties of each technique are discussed.