Blackbody Cavity Effective Emissivity Comparison and Brightness Temperature Comparison Experiment for Ear Thermometer Verification and Calibration
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摘要: 耳温计检定校准用黑体辐射源是耳温计检定和校准的计量标准器,黑体空腔的有效发射率是其关键特性。介绍耳温计检定规程推荐黑体空腔的发射率特性,并与两种国际标准推荐的耳温计黑体空腔进行了亮度温度比对实验。在数据分析基础上,给出对三个耳温计黑体空腔的评价。Abstract: The effective emissivity of the blackbody cavity is a key characteristic of the blackbody radiation source for ear thermometer calibration and verification. The emissivity characteristics of the blackbody cavity recommended by the ear thermometer calibration protocol are presented, and brightness temperature comparison experiments are conducted with the blackbody cavities of two international standards recommended for ear thermometers. Based on the data analysis, an evaluation of the three ear thermometer blackbody cavities is given.
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Key words:
- ear thermometer /
- blackbody cavity /
- effective emissivity /
- brightness temperature /
- comparison
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表 1 耳温计检定校准用黑体辐射源空腔规格参数
Table 1. Cavity parameters of blackbody radiation source for verification and calibration of ear thermometer
温度
范围开口
直径腔体
直径深度 漆发
射率腔口100°出射
角内发射率20 °C~50 °C 10 mm 60 mm 118.2 mm 0.965 0.9998 0.94 0.9997 0.92 0.9996 表 2 标准铂电阻温度计示值比较(单位: ℃)
Table 2. Comparison of indication of standard platinum resistance thermometer (unit: ℃)
温度/ ℃ 一等标准铂电阻
温度计1# ℃一等标准铂电阻
温度计2#/ ℃35.000 35.002 35.002 37.000 37.002 37.003 41.500 41.500 42.502 表 3 亮度温度比对结果(单位: ℃)
Table 3. Comparison results of repeatability brightness temperature measured by ear thermometer in test mode (unit: ℃)
温度 亮度温度差1(ASTM-NIM) 亮度温度差2(EN-NIM) 测试1 测试2 平均值 测试1 测试2 平均值 35.50 −0.01 0.00 0.00 −0.01 −0.01 −0.01 37.00 0.00 −0.01 0.00 −0.01 −0.01 −0.01 41.50 0.00 0.00 0.00 −0.01 −0.01 −0.01 -
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