Practical test of a point-source integrating cavity absorption meter: the performance of different collector assemblies.
Practical test of a point-source integrating cavity absorption meter: the performance of different collector assemblies.
复制标题
点源积分腔吸收计的实际测试：不同收集器组件的性能。
作者：
R. Röttgers;W. Schönfeld;P. Kipp;R. Doerffer
介绍了一种点源积分腔吸收测量仪（PSICAM）的原理，并与分光光度法进行了比较。测试了PSICAM的不同光收集器组件在广泛的浓度和散射特性范围内准确确定水成分吸收的能力。具有辐射型传感器的PSICAM设置显示出最佳性能。它与使用非散射染料溶液的光度吸收测定进行了比较。在400-700 nm的光谱范围内，两种方法之间的平均差异小于2.4%。当配备辐射传感器作为光收集器时，PSICAM的吸收测定仅受散射和温度的影响很小。我们的结论是，PSICAM可以用来确定在环境温度下的天然海水样品的吸收。
A prototype point-source integrating cavity absorption meter (PSICAM) is presented and compared with spectrophotometric absorption measurements. Different light collector assemblies of the PSICAM were tested regarding their capability to determine the absorption of water constituents accurately over a wide range of concentrations and scattering properties. The PSICAM setup with a radiance-type sensor showed the best performance. It was compared with a photometric absorption determination using nonscattering dye solutions. The mean difference between both methods was less than 2.4% in the spectral range of 400-700 nm. The absorption determination with the PSICAM, when equipped with a radiance sensor as a light collector, was only little affected by scattering and temperature. We conclude that the PSICAM can be used to determine the absorption of natural seawater samples at ambient temperatures.