光谱辐射亮度国际比对与结果分析

International Comparison and Result Analysis of Spectral Radiance

基于高温黑体辐射源BB3500M,中国计量科学研究院(NIM)自主研制了第四代光谱辐射亮度国家基准装置,波长范围覆盖220~2 550 nm,以稳定的钨带灯作为传递标准,改善了测量不确定度。黑体辐射源的温度测量溯源至Pt-C和Re-C固定点黑体,在3 021 K采用WC-C固定点黑体进行验证,NIM和全俄光学物理计量院(VNIIOFI)之间的测量偏差小于70 m K。采用新基准装置,NIM参加了光谱辐射亮度国际APMP-PR. S6比对。NIM研制了两套入射光学系统,成像倍率分别为0. 58和1. 00,立体角为0. 006 sr和0. 008 sr,采用两套系统复现光谱辐射亮度量值的差异小于±0. 40%。APMP-PR. S6比对结果表明:在紫外、可见和近红外波长范围,NIM与参考值的平均相对偏差分别为0. 59%、0. 44%和0. 34%。全部波长范围的平均相对偏差0. 46%。在250 nm、400 nm、800 nm、2 500 nm波长,光谱辐射亮度的测量标准不确定度分别为0. 95%、0. 50%、0. 41%和0. 80%。从而验证了第四代光谱辐射亮度国家基准装置的准确性和可靠性。

Based on BB3500 M high temperature blackbody,the fourth-generation primary standard apparatus of spectral radiance was developed at National Institute of Metrology( NIM) in the spectral wavelength from 220 nm to 2 550 nm. A group of stable tungsten strip lamps were used as the transfer standards. The temperature measurement of the high temperature blackbodies were traced to the Pt-C and Re-C fixed point blackbodies and checked against the WC-C fixedpoint blackbody,and the consistency of the temperature realized by NIM and All Russian Research Institute for Optical and Physical Measurements( VNIIOFI) at 3021 K was better than 70 m K. Spectral radiance was realized by two different entrance systems at NIM respectively,and the imaging ratio of the two system were 0. 58 and 1. 00,the solid angle were0. 006 sr and 0. 008 sr. The relative deviation of spectral radiance was less than ± 0. 40% by using the two system at all wavelengths. With the new developed primary standard apparatus,NIM took part in the international comparison of spectral radiance APMP-PR. S6. The comparison result shows that the average relative deviation are 0. 59%,0. 44% and 0. 34%respectively in ultraviolet,visible and near infrared wavelength. The average relative deviation in the whole wavelength is0. 46%. The measurement standard uncertainty of spectral radiance of NIM are 0. 95%,0. 50%,0. 41% and 0. 80% at250 nm,400 nm,800 nm and 2 500 nm respectively. The comparison result verified the performance of NIM’s new national standard apparatus of spectral radiance.