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采用所研制的紫外辐射照度计余弦响应特性测试平台,对21种市面上常用的商业紫外辐射照度计进行了余弦响应特性测试。测试结果表明,不同型号、不同探测器结构、不同漫射器材料的紫外辐射照度计的余弦响应特性差异较大,客观地反映了当前紫外辐射照度计的水平。当入射角为±10°时,余弦误差变化范围为0.03%～15.83%;当入射角为±30°时,余弦误差变化范围为1.85%～73.66%;当入射角为±60°时,余弦误差变化范围为1.82%～65.04%。在实际测量中,经常会用到大面积的紫外辐射光源或是形状不规则如长条形的紫外辐射光源,在测试时不能保证光线垂直入射到探测器,同时也不能满足点光近似条件,测试结果误差较大。通过测试可以准确地了解当前紫外辐射照度计的余弦响应特性,用于指导实际的实验测试,合理地调整测试条件以满足测试需求,必要时可进行相应的余弦误差修正。
The cosine response characteristics of 21 commercially available UV irradiance meters were tested by using the developed cosine response characteristic test platform of UV radiometer. The test results show that the cosine response characteristics of ultraviolet radiation illuminometer with different types, different detector structures and different diffuser materials are quite different, objectively reflecting the current level of ultraviolet radiation illuminometer. The cosine error varies from 0.03% to 15.83% when the incident angle is ± 10 °. The cosine error varies from 1.85% to 73.66% when the incident angle is ± 30 °. When the incident angle is ± 60 °, the cosine The error ranged from 1.82% to 65.04%. In the actual measurement, often use a large area of UV radiation or irregular shape of a long strip of UV radiation source, the test can not guarantee the light incident perpendicular to the detector, but also can not meet the approximate conditions of light, The error of the test result is bigger. The test can accurately understand the cosine response characteristics of the current UV irradiance meter, used to guide the actual experimental test, reasonable adjustment of test conditions to meet the testing needs, if necessary, the corresponding cosine error correction.