共查询到16条相似文献,搜索用时 549 毫秒
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对中国计量科学研究院研制的温度范围覆盖-93~220℃的H500型红外遥感定标高精度真空黑体辐射源进行了介绍。采用圆柱圆锥黑体腔和双层4段PID控温,在真空低背景(液氮冷却)环境下对该黑体进行了性能测试,在大气室温环境下,利用控制环境辐射反射比发射率测量方法测量了黑体空腔发射率和利用红外标准辐射温度计测量空腔底部温度均匀性等指标。实验结果表明,该黑体辐射源升温速率为1℃/min下,控制到温度点的稳定时间优于50 min,并且10 min内的温度稳定性在0.01℃以内;黑体温度设置在20℃、30℃和50℃下空腔发射率的测量结果分别为0.9965、0.9966和0.9963;其黑体底部温度均匀性优于0.03℃;在整个温度区域内扩展不确定度优于0.1℃(k=2)。 相似文献
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介绍了中国计量科学研究院研制的中温区真空标准黑体辐射源的结构设计,工作原理,测试结果和不确定度评定。黑体辐射源工作温度范围为320~500K,黑体空腔开口直径为50mm,空腔深度为260mm,表面喷涂了耐高温漆,空腔发射率优于0.999。真空环境下测试了黑体在335~500K温度范围内的轴向温度均匀性,温度稳定性及黑体辐射源亮度温度等性能指标,结果显示黑体温度均匀性优于0.15K,40min内温度稳定性优于0.03K。分析了黑体辐射源的不确定度来源,黑体辐射源的合成标准不确定度优于0.04K。 相似文献
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介绍了中国计量科学研究院研制的100~400K真空红外亮温标准黑体辐射源的工作原理、结构、性能测试方法及测试结果。黑体辐射源通过液氮制冷与3温区控制实现了100~400K范围内的温度控制。在真空环境下,测试了其在温度范围100~400K轴向温度均匀性、底部温度稳定性等技术指标,结果表明均匀性优于0.120K,控温稳定性优于0.020K/20min;在室温大气环境下,利用基于控制环境辐射的发射率测量方法测量了黑体空腔发射率,空腔法向发射率为0.9998。采用基于蒙特卡罗黑体发射率仿真计算方法分析轴向温度均匀性对空腔发射率的影响,分析了标准黑体辐射源的不确定度来源,在8~16 μm波长亮度温度的合成标准不确定度优于0.030K。 相似文献
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介绍了中国计量科学研究院为风云三号05星红外高光谱大气探测仪研制的微型镓固定点星载黑体辐射源。设计了黑体辐射源空腔,其有效发射率优于0.997。针对星载固定点黑体辐射源的结构设计和性能测试展开了研究:星载固定点黑体辐射源17 ℃的温度均匀性仿真结果优于0.01℃;黑体辐射源在真空下均匀性优于0.02 ℃,稳定性优于0.002 ℃(90 min内);在通过满足航天应用的力学冲击等实验后,镓固定点的复现性优于0.03 ℃;微型固定点相变温坪复现实验加热功率与拐点值之间存在较好的线性关系。 相似文献
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为了延长固定点黑体容器使用寿命和简化使用流程,依据热管黑体和传统石墨坩埚黑体的设计使用经验,研制了改进型封装固定点黑体。针对所研制的锡固定点黑体分别用二等标准铂电阻和传递辐射温度计开展复现测试。改进型封装固定点黑体在经历20余次熔凝循环后,没有出现破裂和金属泄露现象。用标准铂电阻复现多次的平均值为231.909℃,扩展不确定度为0.015℃(k=2);而用固定点黑体校准传递辐射温度计的多次平均值为231.85℃,扩展不确定度为0.096℃(k=2)。 相似文献
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Hsin-Yi Ko Bor-Jiunn Wen Shu-Fei Tsa Guo-Wei Li 《International Journal of Thermophysics》2009,30(1):98-104
A newly designed high-emissivity cylindrical blackbody source with a large diameter aperture (54 mm), an internal triangular-grooved
surface, and concentric grooves on the bottom surface was immersed in a temperature-controlled, stirred-liquid bath. The stirred-liquid
bath can be stabilized to better than 0.05°C at temperatures between 30 °C and 70 °C, with traceability to the ITS-90 through
a platinum resistance thermometer (PRT) calibrated at the fixed points of indium, gallium, and the water triple point. The
temperature uniformity of the blackbody from the bottom to the front of the cavity is better than 0.05 % of the operating
temperature (in °C). The heat loss of the cavity is less than 0.03 % of the operating temperature as determined with a radiation
thermometer by removing an insulating lid without the gas purge operating. Optical ray tracing with a Monte Carlo method (STEEP
3) indicated that the effective emissivity of this blackbody cavity is very close to unity. The size-of-source effect (SSE)
of the radiation thermometer and the effective emissivity of the blackbody were considered in evaluating the uncertainty of
the blackbody. The blackbody uncertainty budget and performance are described in this paper. 相似文献
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红外耳温计分度方法及数据分析 总被引:1,自引:1,他引:0
研制了一种专门用于红外耳温计分度的双孔黑体空腔,并用研制的黑体空腔对红外耳温计在37℃和41℃进行了分度实验.实验结果表明,此黑体空腔的空腔发射率已达到0.999,完全能作为红外耳温计分度的标准辐射源.最后对实验结果进行了不确定度的评定. 相似文献
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Research on H500-Type High-Precision Vacuum Blackbody as a Calibration Standard for Infrared Remote Sensing 总被引:1,自引:0,他引:1
X. P. Hao J. P. Sun L. Y. Gong J. Song J. M. Gu L. Ding 《International Journal of Thermophysics》2018,39(4):51
Based on the calibration requirements of vacuum low background aerospace infrared remote sensing radiance temperature, a high-precision vacuum blackbody (H500 type) is developed for the temperature range from ??93 °C to +?220 °C at the National Institute of Metrology, China. In this paper, the structure and the temperature control system of H500 are introduced, and its performance, such as heating rate and stabilization of temperature control, is tested under the vacuum and low-background condition (liquid-nitrogen-cooled shroud). At room temperature and atmospheric environment, the major technical parameters of this blackbody, such as emissivity and uniformity, are measured. The measurement principle of blackbody emissivity is based on the control of surrounding radiation. Temperature uniformity at the cavity bottom is measured using a standard infrared radiation thermometer. When the heating rate is 1 °C min?1, the time required for the temperature to stabilize is less than 50 min, and within 10 min, the variation in temperature is less than 0.01 °C. The emissivity value of the blackbody is higher than 0.996. Temperature uniformity at the bottom of the blackbody cavity is less than 0.03 °C. The uncertainty is less than 0.1 °C (k?=?2) over the temperature range from ??93 °C to +?67 °C. 相似文献