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为满足国内黑体辐射源亮度温度的溯源需求,中国计量科学研究院研制了50~270℃大口径高发射率水热管标准黑体辐射源。本文介绍了水热管黑体辐射源的研制、性能测试和不确定度。利用Monte Carlo方法研究了圆柱形空腔内壁V槽角度对空腔法向有效发射率的影响。设计了圆柱形空腔,内壁加工31°角的1 mm深V形槽,喷涂高发射率Pyromark 1200黑漆,空腔开口74 mm,腔深520 mm,法向有效发射率优于0.999 8,实现了黑体源空腔在大口径条件下的高发射率。设计了基于PID控制的黑体辐射源温度控制系统和高精度的黑体辐射源空腔温度测量系统。水热管黑体辐射源的温度稳定性为0.04℃/20 min,空腔底部有效亮度温度均匀性为0.08℃,有效亮度温度扩展不确定度为0.036~0.104℃。建立了基于变温黑体辐射源的国家亮度温度标准。 相似文献
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本文叙述以陶瓷管为芯子的工业用中温(300-1200℃)黑体辐射源(黑体炉)。黑体空腔采用三段式加热方式.开口段加热元件采用不均匀绕法。设置了靶后腔体。经测试表明.腔壁有效温区最大温差在3.0K以内.采用Bedford法计算了腔体有效发射率分布,在等温情况下靶面平均有效发射率0.9983。 相似文献
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根据影响建立在线黑体辐射源的要素及连续退火炉内外物理条件,首次提出,可以将在连退炉中运动带钢与炉辊底部之间自然形成的腔体看作是一个在线黑体空腔,用辐射温度计瞄准该黑体空腔,能够测量运动带钢的温度。并基于黑体空腔理论和人工智能方法,根据工业现场的实际安装条件对影响在线黑体空腔精度的因素进行评价,从“腔体的密闭性”和“腔体的等温性”2个方面,对在线黑体空腔参数进行优化,结果与英国LAND公司在本钢冷轧厂实际应用结果十分接近,为炉体设计和现场安装数据提供了新的规划方法,为在线黑体辐射源的建立积累了经验。 相似文献
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前言这种非接触式红外线温度计通过对物体发射的红外线能量的测定,能以极快的速度测定该物质的表面温度。非接触式红外线温度计正作为一种能大大扩展温度测定领域的温度计而受到人们的重视,并已广泛地活跃于学术及产业领域。与接触式温度计比较,其优点如下: (1)响应速度快,能测定过渡温度变化。 (2)能测定机械 相似文献
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王晓明 《现代制造技术与装备》2009,(2)
本文通过对红外测温仪的选型、安装、辐射系数的设定、定期比对等方面的研究,介绍红外测温仪在轧钢关键测量点的应用,解决了红外测温仪在实际生产过程中遇到的问题. 相似文献
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介绍了一种高精度、高可靠性的在轨黑体测温电路。其测温范围是-10~50℃,测温精度为±0.1℃.着重分析了铂电阻R-T关系、惠斯通电桥非线性、模拟放大电路、A/D量化误差和处理器运算截断误差对电路精度的影响,并给出了解决方案。针对铂电阻失效方式,给出了电路可靠性设计方案。理论分析和实际电路测试结果表明,该电路具有精度高、可靠性高、使用方便等优点。 相似文献
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Changes in physicochemical properties of the human hair shaft induced by UVB during the summer climate were investigated. Using atomic force microscopy and thermogravimetric analyzer measurements, we investigated the changes in hair shaft physical properties including morphology, roughness, and water content. The changes in chemical properties were investigated by using FTIR spectroscopy. Hair samples from 20 females without any chemical or physical stresses were investigated. The samples were exposed to various UVB doses of 400, 2,000, and 4,000 mJ/cm(2), which correspond to the radiation times of 0.44, 2.22, and 4.44 h, respectively. The morphology and surface of the hair shaft was not significantly affected by UVB irradiation. The components of keratin were affected by the UVB irradiation where the amide A bands at 3,263 and 3,246 cm(-1) of the proximal and distal roots, respectively, were shifted to higher band region because α-helix converted to β-sheet, and the stretching modes of C-H lipid alkyl chains at 2,965 and 2,850 cm(-1) in the proximal and distal roots, respectively, were developed. As the UVB intensity increased, the water content of the proximal root decreased. 相似文献
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本文介绍了OMEGA公司OS530系列红外辐射温度表测量地表温度的工作原理和使用方法,并利用实测资料分析和讨论了该系列红外辐射温度表在地表温度测量中的使用和误差订正。 相似文献
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介绍了一种红外测温仪,该测温仪基于红外测温模块MLX90601C,具有高测量精度、液晶显示和数据存储、语音播报功能,并带有RS-232数据接口,可以将测得的数据发送到PC.分析了红外测温原理和影响红外测温精度的因素,介绍了MLX90601C的特性与结构,内部寄存器及其功能,介绍了MLX90601C内部温度数据的存储格式及读取方式.分析了SPI串口的读写操作时序.设计了单片机控制MLX90601C的SPI接口电路、语音播报电路和液晶显示电路、RS-232接口电路,编写了测温仪的软件程序. 相似文献
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The authors have developed a new radiation thermometer for the measurement of near room temperature with high signal-to-noise ratio (S/N). The thermometer, utilizing an HgCdTe semiconductor sensor, is compact and insensitive to temperature changes of the surroundings. Its major breakthrough owes much to the fact that the sensor is cooled and controlled by Peltier thermoelectric devices and that the sensor serves as reference radiator. A well designed optical system with a chopper and a concave mirror shuts off stray radiation, thus improving the S/N.
On-line experiments in a steel sheet manufacturing process using a prototype thermometer proved the validity of this new radiation thermometer. 相似文献
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M. Ojanen K. Anhalt J. Hartmann S. Schiller T. Weckström P. Kärhä M. Heinonen E. Ikonen 《Measurement》2010
The radiation temperature scales of PTB and MIKES were compared in the range of 1570–2770 K using four filter radiometers of MIKES, one filter radiometer of PTB, and linear radiation thermometers of both MIKES and PTB. The agreement was partial: two filter radiometers and the linear radiation thermometer of MIKES agreed well with the equipment of PTB, while two filter radiometers deviated from the other equipment. To get a deeper understanding of the reasons of the deviation, the results were studied in terms of both temperature and radiance. The deviation was found constant in terms of radiance. A correction factor was calculated for the radiance level with help of a temperature fixed-point calibration. The use of the correction factor improved the results. 相似文献