Testing technology of vacuum ultraviolet spectral radiance
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摘要: 真空紫外目标的光谱辐射亮度对于深空空间探测、航天器损伤测试等空间科学研究具有重要意义。研究了2种用于针对真空紫外光源的测试系统及其方法，通过对真空紫外光谱辐射亮度测试方法开展研究，研制了真空紫外光谱辐射亮度测试系统，测试系统包括真空紫外标准光源、光学成像系统、分光模块、真空紫外探测器模块、真空舱以及数据处理系统等。利用测试系统根据直接测量法和比较法对氘灯的光谱辐射亮度进行了测试分析，并讨论了真空紫外光谱辐射亮度影响因素及相对示值误差，实现了真空紫外光谱辐射亮度在121.2 nm、135.6 nm、160 nm、180 nm、200 nm五个波长范围 0.01 μW/cm2·nm·sr~1 μW/ cm2·nm·sr的精确测量。测量的重复性为0.001 34。这表明测试系统可以实现真空紫外波段信号的测试。Abstract: The spectral radiance of vacuum ultraviolet (UV) target is of crucial significance to plenty of researches including deep space exploration and spacecraft damage test. Two types of test systems and methods for vacuum UV light sources were studied. Through the research of test method for vacuum UV spectral radiance, a corresponding test system was developed, which included vacuum UV standard light source, optical imaging system, light splitting module, vacuum UV detector module, vacuum chamber and data processing system. According to the direct measurement method and the comparative method, the spectral radiance of deuterium lamps was tested and analyzed, the influencing factors and the relative index error of vacuum UV spectral radiance were discussed, and the accurate measurement of vacuum UV spectral radiance in the five wavelength ranges of 121.2 nm, 135.6 nm, 160 nm, 180 nm, 200 nm at 0.01 μW/cm2·nm·sr~1 μW/ cm2·nm·sr was realized. The repeatability of the measurement is 0.001 34, which shows that the proposed test system can realize the test of vacuum UV signal.
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Key words:
- vacuum ultraviolet /
- spectral radiance /
- vacuum degree /
- photomultiplier tube
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图 1 直接测量法光谱辐射亮度测试原理图
Fig. 1 Schematic diagram of spectral radiance test based on direct measurement method
图 2 比较法光谱辐射亮度测试原理图
Fig. 2 Schematic diagram of spectral radiance test based on comparative method
图 3 真空紫外光谱辐射亮度测试系统原理图
Fig. 3 Schematic diagram of vacuum UV spectral radiance test system
图 4 真空紫外光谱辐射亮度测试系统实物图
Fig. 4 Physical drawing of vacuum UV spectral radiance test system
图 5 衰减片对121.2 nm透过率的影响测试结果
Fig. 5 Test results of transmittance at 121.2 nm by attenuator
图 6 衰减片对135.6 nm透过率的影响测试结果
Fig. 6 Test results of transmittance at 135.6 nm by attenuator
图 10 不同波长下衰减片透过率测试结果
Fig. 10 Test results of attenuator transmittance at different wavelengths
图 12 不同真空度环境对真空紫外光谱测量的影响
Fig. 12 Effect of different vacuum degree environment on vacuum UV spectrum measurement
表 1 真空紫外光谱辐射亮度测试结果
Table 1 Test results of vacuum UV spectral radiance
波长/nm 光谱辐射亮度标准值/
（μW/ cm2·nm·sr）测试结果Lmeasure（λ）/
（μW/ cm2·nm·sr）相对示值
误差/%121.2 83.9×103 83.86×103 0.05 135.6 38.08×103 38.16×103 0.21 160 140.4×103 141.04×103 0.46 180 6.29×103 6.30×103 0.16 200 5.80×103 1.34×103 0.17 
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表 2 组合衰减片的真空紫外光谱辐射亮度记录表
Table 2 Vacuum UV spectral radiance record of combined attenuator
波长/
nm光谱辐射
亮度标准值/
（µW/ cm2·nm·sr）光谱辐射
亮度测量
值/（μW /
cm2·nm·sr）相对示值
误差/%标准值
L1（λ）衰减倍率K 最终标
准值L2（λ）121.2 83.90×103 6.08×105 1.36×10−1 1.34×10−1 1.47 135.6 38.08×103 7.74×105 4.93×10−2 5.00×10−2 1.42 160 140.4×103 8.48×105 1.65×10−1 1.70×10−1 3.03 180 6.29×103 6.44×105 9.76×10−3 9.96×10−3 2.05 200 5.80×103 6.82×105 8.51×10−3 8.73×10−3 2.59
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表 3 真空紫外光谱辐射亮度重复性部分测试结果
Table 3 Partial test results of vacuum UV spectral radiance repeatability
测量次数 光谱辐射亮度测试结果/（μW/cm2·nm·sr） 121.2 nm 180 nm 1 1.33×10−1 9.88×10−3 2 1.36×10−1 9.70×10−3 3 1.34×10−1 10.16×10−3 4 1.35×10−1 10.20×10−3 5 1.33×10−1 10.11×10−3 6 1.32×10−1 9.70×10−3 平均值 1.34×10−1 9.96×10−3 重复性 1.344×10−3 2.088×10−4
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