用聚乙烯片连续测量太阳紫外辐射的研究

THE STUDY OF CONTINUOUS MONITORING OF SOLAR ULTRAVIOLET RADIATION USING POLYETHYLENE SHEET

本文对用聚乙烯作为潜在的廉价的光接收体以测量抵达地面的太阳紫外辐射进行了研究。发现含特定添加剂的厚度0.2mm的聚乙烯片可用来连续累积测定波长范围300～400hm的太阳与天空紫外光的辐照量,按照光电法仪器的订定,投射到聚乙烯片曝露表面的太阳与天空紫外光的辐照量是归属为由聚乙烯的光降解导致生成的末端乙烯基的909cm^(-1)红外吸收峰的吸光度增量的幂函数。同时聚乙烯的光降解亦与其他气候因素有关,但它们的影响可以通过由曝露期间的平均气温建立的经验式予以修正,用本法在广州进行的全年连续监测结果表明,它的测量值与以光电转换为工作原理的仪器之测量值比较,偏差小于10％。

PE was tested as potential inexpensive receptor for integrating daily ultraviolet doses in the range 300 to 400 nm wavelengths from sun and sky. PE sheet containing designated additive of 0. 2 mm thick was found most suitable for the purpose. Its increment of 1R absorbance at 910 cm-1 due to terminal vinyl group of PE is an adequately power function of UV doses irradiated on exposed surface according to calibration with a radiometer utilized photoelectric sensor. PE degradation response is also dependent of other climatic elements, but this effect can be satisfactorily corrected by an empirical formula on the basis of the mean air temperature during exposure. The results from the year-round monitoring of solar UV radiation at Guangzhou are presented, and which demonstrated that the absolute difference between the UV doses determined with instrumental method and those determined with PE dosimter is less than 10 percent.