MTS-QT/25电子拉力试验机的一种示值误差校正方法

本文通过对MTS－QT／25电子拉力试验机试验机力传感器自校准过程的分析研究介绍了一种试验机的示值误差校正方法。     

中国船舶重工集团公司第七二五研究所

<正>检测与校准中心非金属材料检测站物理机械性能测试非金属检测站拥有MTS系列电子万能试验机、Nicolet8700红外光谱仪、FTT0053烟密度测定仪、HFM436型导热系数测定仪,蠕变试验机、氧指数测定仪、水平垂直燃烧测定仪等多台先进仪器设备,可进行多种材料的拉伸、弯曲、剪切、撕裂、蠕变、粘接、剥离、冲击、     

工业分析仪校准方法探讨

对工业分析仪的校准方法进行了探讨,建立了校准条件、校准技术要求、校准项目和校准方法等,实例分析证明了本校准方法能合理的评价工业分析仪的性能,保证了工业分析仪测试数据的准确性、一致性和溯源性.     

浅谈确保校准结果质量的几个方面

本文主要从人员的选择和管理、校准设备的配置和使用、校准方法和校准环境控制等方面阐述了校准实验室校准结果质量控制保证要点及实施的基本方法。     

MTS Landmark^TM列电液伺服测试平台产品发布会在上海举行

2008年4月8日，MTS Landmark^TM系列电液伺服测试平台产品发布会在MTS工业系统（上海）有限公司圆满召开。MTS中国区总裁陈国瑜先生、中国区市场拓展经理曹威先生、中国力学学会MTS分会领导及美国MTS材料试验专家出席了此次发布会，共有来自全国各地近百名MTS材料力学用户及材料试验专家参加了此次发布会。     

MTS Landmark^TM系列电液伺服测试平台产品发布会在上海举行

2008年4月8日，MTS Landmark^TM系列电液伺服测试平台产品发布会在MTS工业系统（上海）有限公司圆满召开。MTS中国区总裁陈国瑜先生、中国区市场拓展经理曹威先生、中国力学学会MTS分会领导及美国MTS材料试验专家出席了此次发布会，共有来自全国各地近百名MTS材料力学用户及材料试验专家参加了此次发布会。     

电火花检漏仪的校准

针对国内电火花检漏仪无国家检定规程或校准规范可依据的现状,探讨该类设备的校准方法以及校准参数的选择。基于电火花检漏仪的工作原理及计量特性,从校准的准备、校准项目、校准方法及对标准器的要求展开论述,提出不同类型电火花检漏仪校准项目及校准方法的异同,形成一套系统地科学地校准方案。实验表明,校准方法可靠,有良好的可操作性和溯源性,为电火花检漏仪的现场工作提供保证。     

射线图像分辨力测试计的校准方法

近年来,射线图像分辨力测试计在工业无损检测和医学诊断仪器校准中的应用日趋广泛。射线图像分辨力测试计作为测量图像分辨力的专用标准器具,目前国内尚无可依据的计量检定规程/校准规范对其计量性能进行控制。文章详细介绍了射线图像分辨力测试计的校准环境、校准设备、技术指标要求、校准项目和校准方法等,并通过校准实例分析和测量不确定度评定对校准方法进行了验证。提出的校准方法为射线图像分辨力测试计的校准工作提供了参考。     

执行规程前的条件验证

正检定、校准和检测方法是实施检定、校准和检测的技术依据。它是检验检测机构开展检定、校准和检测服务的重要资源,对它的控制也是实施检定、校准和检测活动不可缺少的过程。检验检测机构应建立和保持检定、校准和检测方法控制程序对方法进行控制。检定、校准和检测方法包括标准方法和非标准方法,应优先使用标准方法,     

激光测速仪校准技术研究

综述了激光测速仪的现有校准方法,提出了采用模拟目标进行激光测速仪校准的新方法,并根据该原理研建了校准装置.经各种校准方法的比较分析和校准试验验证,说明装置校准范围宽、重复性好、通用性好,可以满足激光测速仪的校准需求.     

比较法校准氦真空参考漏孔漏率及合成不确定度评定

直接比对法是氦质谱检漏仪在稳定工作和引入气体相同条件下,将参考漏孔流出的氦气和标准漏孔提供的已知流量的氦气分别引入校准室中,用氦质谱检漏仪分别测量氦气产生的离子流,通过比较两次离子流的测量值计算出参考漏孔漏率的一种校准方法。这种校准范围为1×10-7Pa.m3/s~1×10-10Pa.m3/s。对同一参考漏孔,采用同样的校准测量,可以采用高斯分布统计的方法获得校准不确定度,其他不确定度分量由氦质谱检漏仪组成的校准装置决定,其合成相对不确定度可达到10%。     

Effective spectral method for testing diode modulation meters

Conclusions The error in testing and calibrating modulation meters at high modulating frequencies (up to 500 kHz) by the suggested method does not exceed 2%.By the suggested method it is possible to evaluate the error of calibrating by means of a pulsating signal fed to the input of the diode detector. The pulsating signal method provides a small calibration error at modulating frequencies up to 20 kHz, but it has a considerable error at modulating frequencies in the radio range.     

全静压受感器冰风洞试验技术研究

主要论述了全静压受感器的冰风洞试验技术,着重介绍了该仪器的冰风洞试验项目、试验条件及参数测量校准方法,并从航空仪器仪表公司的冰风洞的自身特点出发,论述了该仪器冰风洞试验的效果及据此提出的改进建议,为今后国内对相应的小型仪器仪表或缩比模型进行冰风洞试验提供了一定的参考价值。     

Error in measuring effective voltages with a quasi-linear detector

Conclusions The errors due to distortions of the measured and the calibrating signals depend both on even and odd harmonics. For small distortions of the measured signal it is necessary to take into account the distortions of the calibrating voltage. For a nonideal linear detector the error is not a single-valued function of the measured and calibrating signals’ form factors and it is determined by the relationships derived above. Translated from Izmeritel’naya Tekhnika, No. 8, pp. 48–50, August, 1969.     

High precision measurement of DC voltage ratios from 20 V/10 V to1000 V/10 V

This paper presents a new method of calibrating de voltage ratios from 20 V: 10 V to 1000 V: 10 V. A new battery-powered differential voltage detector has been developed to reduce the uncertainty of the measurement system. An absolute self-calibration process was used and traceability to a voltage ratio standard is not necessary. The uncertainties of dc voltage ratios (20 V to 1000 V): 10 V were less than 2 × 10^-7     

Calibration of a sequentially reflective colorimeter using a tri-color LED

We built a simple colorimeter using a tri-color LED to measure the color of a test object. The color was determined by measuring the reflected intensities of three successively incident light pulses in red, green, and blue colors. The reflected signals reaching the detector at different times were recorded respectively using three sample-and-hold circuits, and then processed by a computer to give the chromaticity coordinates (x, y). In the calibrating procedure, we assumed a simple linear transformation between three CIE color coordinates (X, Y, Z) and the three measured reflectance values. The linear transformation was characterized by a 3?×?3 matrix whose nine elements were determined by four standard samples with their chromaticity coordinates measured by a well-calibrated instrument. Our method works well without any information about the spectrum of illuminant and the color-matching functions. We also demonstrate the applicability of our calibrating method to two conventional illuminants: a bulb and a fluorescent lamp.     

Preparation of a Pu standard source II. Source preparation and standardization

A standard source of ²³⁸Pu was prepared for calibrating the counting efficiency of alpha-ray detector. The plutonium was electrodeposited on a platinum or tantalum disk using isopropyl alcohol-hydrochloric acid solution as an electrolyte. The absolute activity was certified by isotope dilution alpha-ray spectrometry. Several types of the source, whose areas ²³⁸Pu-deposited are from 2.0 to 25.0 mm in diameter, were also prepared by the method. The overall uncertainties of the certified values for the standard sources prepared are estimated to be within 0.15 to 0.25% (1σ).     

Application of voxel phantoms and Monte Carlo method to whole-body counter calibration

Voxel phantoms and Monte Carlo methods are of considerable interest in calibrating in vivo counting applications for radioactive body burden such as whole-body counters. At the Japan Atomic Energy Research Institute (JAERI), a calculation code--UCWBC code--for whole-body counter calibrations using voxel phantoms has been developed as an EGS4 Monte Carlo user code. To validate the UCWBC code for calibrating whole-body counters at JAERI, response functions and counting efficiencies of a p-type high-purity Ge (HPGe) semiconductor detector used for the whole-body counter were evaluated for a water-filled block-shape phantom by use of UCWBC code and were measured by experiments. The voxel version of the water-filled block-shape phantom based on an actual phantom was used for the calculations. Furthermore, counting efficiencies of the Ge semiconductor detector for the male and female voxel phantoms developed at JAERI were evaluated in the photon energy range from 60 to 1836 keV by the UCWBC code in order to examine the differences between the counting efficiencies for voxel phantoms. In conclusion, it was found that the response functions and counting efficiencies of the Ge semiconductor detector found by the UCWBC code for the water-filled block-shape phantom are in good agreement with measured data. The UCWBC code was validated by those comparisons. It was also found that the counting efficiencies of the Ge semiconductor detector depend on the size of the phantoms and the effective distance between phantom and detector. The calibration of whole-body counters using voxel phantoms and Monte Carlo methods would be quite useful for the improvement in the accuracy of measurement results.     

Technique of Calibration of a Working Standard of the Energy Unit of Narrow-Pulse Laser Radiation and Results of Trial Use of the Standard

Questions related to the design and testing of a technique of calibrating a working energy unit of narrow-pulse laser radiation by means of an electrical working system and determining the degree of equivalence of the optical and electrical conversion ratios of a calorimetric detector are considered. Results from calibration of the standard in the course of a trial period are also presented.     

垂直冲击试验及校准方法

介绍了垂直冲击机的结构、组成及工作原理;根据垂直冲击试验的各项技术要求建立校准系统,确立校准方法;采用计算机对整个校准过程的校准结果进行数据采集和波形分析,并针对不同试件调整其校准方法.