网络化虚拟仪器

随着计算机技术，网络技术的飞速发展，网络化虚拟仪器在其推动下出现了，网络化虚拟仪器的出现极大拓宽了仪器的应用领域，使人们可以在任何时间任何地点获取到测量信息，本文主要介绍了虚拟仪器的硬件构架，网络化虚拟仪器，网络测量的几种组建方法。     

网络化虚拟仪器

随着计算机技术、网络技术的飞速发展 ,网络化虚拟仪器在其推动下出现了。网络化虚拟仪器的出现极大拓宽了仪器的应用领域 ,使人们可以在任何时间任何地点获取到测量信息。本文主要介绍了虚拟仪器的硬件构架、网络化虚拟仪器、网络测量的几种组建方法     

基于虚拟仪器的网络化测控实验技术

将网络技术,自动测试技术和虚拟仪器等先进技术相结合,利用具有GPIB接口的仪器同PC机连接,组建基于Internet和GPIB总线的网络化电子测量和控制实验平台.本文介绍组建基于GPIB总线的网络化自动测控实验平台的方案,用PC机与GPIB接口的仪器网络连接与远程控制的技术,虚拟仪器的结构、特点及文本化的编程语言LabWindows/CVI.网络化虚拟仪器的使用可以实现资源共享,共同完成实验任务.实验平台建成后实际使用情况表明,网络化电子测量与控制实验属于远程虚拟实验,网络化测控实验操作的流程及效果与传统实验方法相比,具有明显的优势:具有经济性好、开放性高、针对性强、实验模式新等优势.远程虚拟实验将促进观念与实验模式的变革,促进实验内容与实验方法的改进,是今后远程实验发展的主流与趋势.     

测量技术与仪器发展的新趋势-网络化

以Internet为代表的网络技术的出现以及它与其他高新科技的相互结合，为测量与仪器技术带来了前所未有的发展空间和机遇，网络化测量技术与具备网络功能的新型仪器应运而生。     

网络化虚拟仪器技术及应用

本文介绍了网络仪器概念，着重论述了基于Web的虚拟仪器及虚拟仪器的三个网络功能。举例说明如何用虚拟仪器构建Internet上的测控系统，对网络化虚拟仪器的发展作了展望。     

基于Internet的虚拟仪器测试系统

基于Internet/Intranet的虚拟仪器测试系统将虚拟仪器与Internet结合,实现了测试系统的网络化、自动化.本文给出了测试系统的B/S结构、系统功能模型和网络化虚拟仪器的设计与实现.     

网络化虚拟仪器的构建

虚拟仪器技术和网络技术为测量领域带来了巨大的变革,使传统意义的测量发生了质的飞跃。本文将虚拟仪器技术和网络测量技术相结合阐述了网络虚拟仪器的实现途径,指出“网络就是仪器”将成为测量领域新的发展趋势。     

热电偶温度计远程校准系统设计

计算机网络技术和虚拟仪器技术的发展为实现测量系统的远程控制提供了技术基础。本文介绍了利用LabVIEW控制数据采集模块,实现热电偶电动势信号的采集,并通过Internet实现数据的传输和接收,从而完成热电偶远程检定方案的实现。     

组件化虚拟式应变测量技术

传统应变测量仪器普遍存在功能单一,无法对数据作进一步处理,以及价格昂贵等缺点。虚拟仪器则代表着从传统硬件为主的测量系统到以软件为中心的测量系统的根本性转变。将组件技术应用于虚拟仪器领域,可以缩短仪器开发的周期,提高软件的重复使用性,为实现基于网络环境的虚拟仪器提供了思路。本文阐述虚拟仪器技术在改造传统应变测试仪器中所具有的无可比拟的优点,并结合组件技术,组建精度更高、功能更强的应变测试系统。该系统可对与应变测量有关的多类型参量进行实时测量,将信息的采集和处理一体化,数据和结果实现可视化,并大大提高工作效率。     

网络化虚拟仪器实验与管理系统的设计

介绍网络化虚拟仪器实验教学管理系统的实现方法。通过建立虚拟仪器实验系统,结合数据库和网络技术,建立数据库,开发网络化的虚拟实验管理系统,充分发挥虚拟仪器的优势,最大限度地实现硬件资源共享。以一个用当今流行的虚拟仪器开发软件LabVIEW开发的虚拟仪器实验系统为例,分析网络化的虚拟仪器在实验教学中的优势。     

The ANO-1 automatic hydrostatic leveler

Conclusions The ANO-1 hydrostatic leveler enables one to measure deviations from horizontal in guides of considerable length automatically. A difference from standard optical methods is that the error of measurement is independent of the extent of the object, and the accuracy is the same at any point. The automatic instrument provides not only improved productivity but also better accuracy because of reduction in the measurement time and high sensitivity in the conversion.Translated from Izmeritel'naya Tekhnika, No. 12, pp. 18–19, December, 1981.     

Digital Instrumentation for the Time Integral of the Square of a Slowly Fluctuating Voltage

A portable digital instrument is described that provides a decimal readout of 1) the time integral of the square of a fluctuating voltage and of the measuring time on two decimal displays, and 2) the amplitude distribution of the voltage. The instrument has no low-frequency limitations. For periodic inputs, measurement may take place over one cycle. For either periodic or random inputs, measurement may be made to commence on a start signal and run for a programmed time. Readout is available immediately at the end of the measuring time, so that the instrument can be used in on-line real-time process control. The voltage under measurement is sampled systematically, and the sampled data are processed using a unique special-purpose digital computer. The paper describes the principles on which measurements are based, and the design and error characteristics of an instrument in which, for most waveforms (e. g., sine, ramp, white noise), the maximum error is in the region of 1 percent and the upper frequency limit is about 1 kHz.     

Angstrom-range optical path-length measurement with a high-speed scanning heterodyne optical interferometer

A highly accurate method of optical path-length measurement is introduced by use of a scanning heterodyne optical interferometer with no moving parts. The instrument has demonstrated the potential to measure optical path length at angstrom resolution over continuous thickness in the micrometer range. This optical path length can be used to calculate the thickness of any material if the refractive index is known or to measure the refractive index of the material if the thickness is known. The instrument uses a single acousto-optic device in an in-line ultra-stable reflective geometry to implement rapid scanning in the microsecond domain for thickness measurements of the test medium.     

Proving the usefulness of a three-port nonlinear vectorial network analyzer through mixer measurements

A three-port nonlinear vectorial network analyzer (NVNA) is presented. This new measurement instrument allows designers to measure for the first time the full nonlinear three-port behavior for any arbitrary mixer. The usefulness of the three-port NVNA is proven on amplitude and phase calibrated three-port measurements of a microwave mixer.     

基于转动惯量的刚体9个惯性参数的测量

针对三维空间,提出了一种可以同时测量刚体9个惯性参数的新方法。利用气体静压轴承低速自由转动时其角速度是一个随时间衰减的单指数函数这一运动规律,测量物体绕任意轴的转动惯量,通过9次测量最终求出刚体的9个惯性参数。设计了一套物体惯性参数测量仪,该测量仪可以同时测量三维空间中物体的9个惯性参数。测量过程中无需重新装配,减少了中间测试量及人为干预误差,使测量时间缩短,测量精度提高。     

水体剖面温度测量仪的研制

研制了一种测量水体表面和水体剖面温度的仪器,详细阐述了该仪器的设计原理、具体结构、测试过程及最终的实验结果。水体剖面温度测量仪集辐射测温与接触测温于一体,可实现水体表面及以下1200mm不同位置水体剖面的温度测量;测量范围在0～40℃,辐射测量不确定度为0.24K,接触测量不确定度为0.12K;该仪器具有自动存储数据的功能,可漂浮在水面上连续自动测量2星期。     

Lateral scanning white-light interferometer

White-light vertical scanning interferometry is a well-established technique for retrieving the three-dimensional shapes of small objects, but it can measure only areas as big as the field of view of the instrument. For bigger fields a stitching algorithm must be applied, which often can be a source of errors. A technique in which the object is scanned laterally in front of an instrument with a tilted coherence plane is described. It permits measurements at higher speeds while measurement accuracy is retained and eliminates the need for stitching in one direction. Experimental confirmation is provided.     

数字微波通信综合测试系统

数字微波通信综合测试仪是将十几台仪器的测试功能集成在一个测试系统中。它可以对数字微波通信系统的大部分参量进行测量 ,特别适合于数字微波移动通信系统的测量。本文简要介绍了数字微波通信综合测试仪的原理和应用。     

基于SoC的动态参数记录仪微型化研究

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.     

Magneto-optic Doppler analyzer: a new instrument to measure mesopause winds

The magneto-optic Doppler analyzer (MODA) is a new type of passive optical instrument that one can use to measure the Doppler shift of the sodium nightglow emitted at approximately 91 km near the mesopause. From this measurement, horizontal wind signatures are inferred. The MODA is based on a sodium vapor magneto-optic filter that provides inherent wavelength stability at a low cost. The instrument has been used to take nightly zonal and meridional wind measurements since October 1994 at Niwot Ridge, Colorado (40 °N, 105 °W). We obtained an internally consistent wind signal and measured the semidiurnal tide for several seasons.