共查询到18条相似文献,搜索用时 62 毫秒
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目前发射率0.95的辐射温度计应用十分广泛,对于这类辐射温度计还没有统一的校准规范。文章对发射率为0.95、光谱范围为8~14μm单波段辐射温度计的校准方法进行了探讨,主要首先讨论了辐射源的选用,其次针对选用黑体辐射源作为标准时辐射温度计理论示值的修正算法,对斯忒藩—玻尔兹曼全辐射定律、极限有效波长法和积分法得到的结果进行了比较,最后对校准过程中环境辐射的影响、校准距离的确定和对辐射源腔口直径的要求给出了相关建议。 相似文献
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辐射温度计近些年来使用得越来越多,使得许多省市计量机构都建立了检定该测温仪的标准。由于影响辐射温度计的准确性的因素比较多,文章对在检定辐射温度计过程中应该注意的问题进行了论述,并给出一些计算方法。 相似文献
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我国对工作用辐射温度计的校准使用《500℃以下工作用辐射温度计检定规程》和《工作用辐射温度计检定规程》,两本规程分别适用于温度范围在500℃以下和300~2200℃的工作用辐射温度计的检定。两本规程都规定,在检定过程中,对于温度计有发射率修正和调节功能的,应将发射率设置为1或将发射率设置为与辐射源靶面的有效发射率相同的数值。在实际工作中,很多工作用辐射温度计的发射率没有调节功能,恒为0.95,有的甚至没有标明发射率是多少,而一般计量部门的标准辐射源的发射率都为1.00。 相似文献
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经典的短波高温修正模型不适用于中长波红外温度计的发射率修正和不确定度评定。采用有效亮度温度概念,得到了对于温度范围和测温波长具有广泛适用性的发射率影响模型以及具有简明物理含义的微差近似形式,包含了经典亮度温度理论中的发射率影响修正和环境辐射误差修正。定量分析了经典的短波高温修正模型的误差。针对黑体辐射源的不同溯源方法,讨论了辐射温度计校准中的发射率影响修正方法,并给出修正实例。所用方法可用于辐射测温应用、辐射温度计校准和黑体辐射源校准中的发射率和环境影响修正以及辐射源发射率不确定度对校准结果不确定度贡献的计算。 相似文献
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红外辐射温度计在低温测量的辐射源尺寸效应(SSE) 的规律不同于高温测量。基于以虚拟探测器温度消除背景辐射影响的SSE计算模型,推导了在不同源尺寸和不同背景条件下辐射温度计输出的SSE影响修正公式;得出不同源尺寸条件下辐射温度计温度示值的SSE影响修正的理论解析表达式。在源温度低于或接近背景温度时修正模型与高温测量SSE修正模型有显著差异。所得结果适用于任意温度下对单波段辐射温度计的SSE影响修正。 相似文献
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为了确定温度传感器辐射修正校准的准确性,需要对温度传感器辐射修正校准结果进行对比及不确定度分析.本文介绍了在热校准风洞中进行温度传感器辐射修正校准的结果,并做了对比研究和不确定度分析. 相似文献
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If a radiation thermometer is calibrated by measuring the temperatures of two cavities having different geometries, sometimes
discrepancies arise between them, even though their emissivities are close to that of a blackbody. The origin of such discrepancies
may result from the size-of-source effect, and in the distance-to-target effect for those thermometers that offer focusing
capability. Examples include: (a) out-of-focus image changes the reading: different focus settings produce different results
and (b) measurements taken at different distances produce different results. These effects are discussed, their contribution
to the measurement uncertainty is evaluated, and some recommendations are made for practical blackbody cavities or radiators
to reduce such effects. 相似文献
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提出了一种检定红外温度计的新方法。应用此方法 ,检定温度计是直接对准被测对象而不是黑体。此外 ,它回避了光谱发射率的测量和温度计光谱响应度的数据。 相似文献
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M. Kobayashi M. Otsuki H. Sakate F. Sakuma A. Ono 《International Journal of Thermophysics》1999,20(1):289-298
A system for measuring time variations of the normal spectral emissivity at wavelengths ranging from 0.55 to 5.3 m was developed and applied to metal specimens in vacuum and oxidizing environments in the temperature range from 780 to 1200° C. The specimen was heated to high temperatures by passing a direct current in a vacuum chamber, and the surface oxidation was controlled by a low-pressure oxidizing gas. The specimen temperature was measured by a single-band (0.9-m) radiation thermometer viewing at a cavity formed in the specimen from the rear side. The front surface of the specimen was observed by a multiband (112-wavelength) radiation thermometer to measure the normal spectral emissivity. The effective normal spectral emissivity of the specimen cavity was evaluated to be 0.94±0.05 at a wavelength of 0.9 m in comparison with a metal tube having a small blackbody hole on the rear. The measurement uncertainty of the normal spectral emissivitiy by the system was estimated to be 5 to 10% of the emissivity value in most of the interesting ranges of emissivities, temperatures, and wavelengths. 相似文献
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现行的辐射温度计检定规程,概念不够清晰,具体操作步骤描述过于简单,造成检定的实际测量条件有明显的差异,由此导致检定结果的差异。本文从技术角度出发,提出了一种可行的操作方法,力图提高辐射温度计检定结果的准确度。 相似文献
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K. Anhalt A. Zelenjuk D. R. Taubert T. Keawprasert J. Hartmann 《International Journal of Thermophysics》2009,30(1):192-202
The paper describes the new experimental setup assembled at the PTB for the absolute spectral responsivity measurement of
radiation thermometers. The concept of this setup is to measure the relative spectral responsivity of the radiation thermometer
using the conventional monochromator-based spectral comparator facility also used for the calibration of filter radiometers.
The absolute spectral responsivity is subsequently measured at one wavelength, supplied by the radiation of a diode laser,
using the new setup. The radiation of the diode laser is guided with an optical fiber into an integrating sphere source that
is equipped with an aperture of absolutely known area. The spectral radiance of this integrating sphere source is determined
via the spectral irradiance measured by a trap detector with an absolutely calibrated spectral responsivity traceable to the
primary detector standard of the PTB, the cryogenic radiometer. First results of the spectral responsivity calibration of
the radiation thermometer LP3 are presented, and a provisional uncertainty budget of the absolute spectral responsivity is
given. 相似文献