共查询到20条相似文献,搜索用时 0 毫秒
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本文根据环境空气在线监测气体分析仪的原理和应用,制定了仪器的计量校准方法,并对计量特性、校准条件、校准项目和方法进行了研究探讨.同时对校准项目(仪器示值误差、重复性和响应时间)进行了细致的阐述.本文将为相关仪器的校准提供良好的技术保障,进一步保证其测量结果的量值统一可溯源. 相似文献
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M. J. Martín J. M. Mantilla D. del Campo M. L. Hernanz A. Pons J. Campos 《International Journal of Thermophysics》2017,38(9):138
The evolving mise en pratique for the definition of the kelvin (MeP-K) [1, 2] will, in its forthcoming edition, encourage the realization and dissemination of the thermodynamic temperature either directly (primary thermometry) or indirectly (relative primary thermometry) via fixed points with assigned reference thermodynamic temperatures. In the last years, the Centro Español de Metrología (CEM), in collaboration with the Instituto de Óptica of Consejo Superior de Investigaciones Científicas (IO-CSIC), has developed several setups for absolute calibration of standard radiation thermometers using the radiance method to allow CEM the direct dissemination of the thermodynamic temperature and the assignment of the thermodynamic temperatures to several fixed points. Different calibration facilities based on a monochromator and/or a laser and an integrating sphere have been developed to calibrate CEM’s standard radiation thermometers (KE-LP2 and KE-LP4) and filter radiometer (FIRA2). This system is based on the one described in [3] placed in IO-CSIC. Different light sources have been tried and tested for measuring absolute spectral radiance responsivity: a Xe-Hg 500 W lamp, a supercontinuum laser NKT SuperK-EXR20 and a diode laser emitting at 6473 nm with a typical maximum power of 120 mW. Their advantages and disadvantages have been studied such as sensitivity to interferences generated by the laser inside the filter, flux stability generated by the radiant sources and so forth. This paper describes the setups used, the uncertainty budgets and the results obtained for the absolute temperatures of Cu, Co-C, Pt-C and Re-C fixed points, measured with the three thermometers with central wavelengths around 650 nm. 相似文献
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The National Metrology Institute of Spain (CEM) has designed, characterized, and set-up its new system to calibrate thermocouples and infrared radiation thermometers up to 1600 °C by comparison to radiation thermometry. This system is based on a MoSi2 three-zone furnace with a graphite blackbody comparator. Two interchangeable alumina tubes with different structures are used for thermocouples and radiation thermometer calibrations. The reference temperature of the calibration is determined by a standard radiation thermometer. Normally, this is used at CEM to disseminate the International Temperature Scale of 1990 (ITS-90) in the radiation range, and it refers to the Cu fixed point. Several noble metal thermocouples and infrared radiation thermometers with a central wavelength near 900 nm have been calibrated, and their uncertainty budgets have been obtained. 相似文献
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Measurement Techniques - A method of calibration of devices used to measure energy by means of a calorimeter and reference photodiode is described. Experimental results of the calibration are... 相似文献
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L. Lucas L. Pibida 《Journal of research of the National Institute of Standards and Technology》2009,114(6):303-320
The National Institute of Standards and Technology (NIST) has developed new gamma-ray and neutron emitting sources for testing radiation detection systems. These radioactive sources were developed for testing of detection systems in maritime applications. This required special source characteristics. 相似文献
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M. P.G. Pepper 《技术计量学》2013,55(3):587-599
The problem of calibration of instrrrments where measurement errors can be described as the sum of random walk and an independent observational error, is considered. Calibration policies, which are relevant to this error structure, are discussed, and comparisons between alternative methods are made. 相似文献
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Dobrovol’skii V. I. Kolerskii S. V. Zubkov P. N. Nechaev N. V. 《Measurement Techniques》2019,62(7):641-645
Measurement Techniques - We describe the method of aspiration capacitor intended for the complex verification and calibration of highly sensitive equipment aimed at the measuring the specific... 相似文献
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导热系数测试仪校准方法研究 总被引:1,自引:0,他引:1
根据防护热板法导热系数测试仪的原理和特点,在理论研究和实践测试的基础上,提出了一种通过精密表面温度计和导热系数参比板来校准其基本示值误差的方法.该方法测量简便,测量值稳定可靠,可溯源至国家计量基准,同时根据传热方程导出了基本误差的计算公式,对实际校准工作具有一定的参考价值. 相似文献
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《IEEE transactions on instrumentation and measurement》1977,26(2):85-87
A switching type radiometer is described in which the comparison of the standard and the unknown noise sources is performed without the physical disconnection of any of the sources. This ensures that no impedance change takes place in the relatively wide frequency band of the measurement. Thus reception of the 'reverse radiation' of the receiver reflected back into the receiver remains constant during the measurement and so may be nulled initially. 相似文献
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ISO Recommended Reference Radiations for the Calibration and Proficiency Testing of Dosemeters and Dose Rate Meters used in Radiation Protection 总被引:1,自引:0,他引:1
Bhm J.; Alberts W.G.; Swinth K.L.; Soares C.G.; McDonald J.C.; Thompson I.M.G.; Kramer H.-M. 《Radiation protection dosimetry》1999,86(2):87-105