ZZLAS型闪烁仪信号饱和界限的确定

闪烁仪能够快速准确地测量区域尺度水热通量,中国产ZZLAS型闪烁仪因测量准确、操作方便、价格低廉等优势在国内具有广阔的应用前景。为进一步提高ZZLAS型闪烁仪的测量精度,推广其在水热通量等研究领域的应用,本文于2014年8-9月,以BLS900为参考标准,分别选择孔径为0.15m和0.075m的ZZLAS型闪烁仪,在平坦均匀的草原下垫面进行信号饱和测定,确定ZZLAS型闪烁仪的饱和界限;并于2014年9-10月,用孔径为0.15m和0.075m的ZZLAS型闪烁仪在复杂的农田下垫面对饱和界限进行验证。结果表明,ZZLAS型闪烁仪的强饱和界限为0.359,弱饱和界限为0.099。验证结果显示,在上述饱和界限条件下,孔径为0.075m的ZZLAS型闪烁仪饱和率最大,为24.58%。实验所得的饱和界限可成为ZZLAS型闪烁仪饱和判断的参考,且在此饱和界限条件下,ZZLAS型闪烁仪发生的饱和现象多属弱饱和现象,可以通过数学方法进行修正。

Determination of Saturation Lines of ZZLAS-Type Scintillometer

Scintillometers were used to precisely measure heat fluxes quickly at a regional scale,and the ZZLAS-type scintillometer made in China possess a wide prospect of application in China due to its accurate measurements,convenient operation and lower price.For the purpose of improving the accuracy of ZZLAS-type scintillometer measurement and promote its application in the field of heat fluxes.This paper set BLS900 as a basement,and chose ZZLAS-type scintillometer with 0.15m and 0.075m apertures for the saturation lines observations under grassland with flat and uniform surface from August to September 2014.From September to October 2014,the ZZLAS-type scintillometers with aperture of 0.15m and 0.075m were used to test the obtained saturation lines with a complex farmland surface.The results revealed that the strong saturation line was 0.359 and the weak saturation line was 0.099.With these lines,the ZZLAS-type scintillometer with 0.075m aperture showed the highest saturation rate of 24.58％.Results showed that the obtained saturation lines could be used as a reference for the saturation judgment of the ZZLAS-type scintillometer;with the lines most saturation phenomenon of the ZZLAS-type scintillometer is slightly saturated and can be corrected through mathematical methods.