Abstract: A modified method for calibrating the supersaturations in the chambers of DMT Cloud Condensation Nuclei Counter is introduced, which decreases the uncertainty in the results of the calibration. In the new method, the complete size-resolved activation ratio for ammonium sulfate is observed, and the activation critical diameter is yielded via fitting the size-resolved activation ratio with two Gauss error functions. With the new method, users can do the calibration periodically to guarantee high-quality observations.

Key words: cloud condensation nuclei counter, supersaturation, calibration

摘要： 提出一种改进的标定云凝结核计数器中等效过饱和比的方法。相对于DMT公司的标定方法, 该方法在流程和数据处理方面都做了改进。标定时观测完整的硫酸铵活化率曲线, 通过高斯误差函数拟合的方法确定硫酸铵活化的临界粒径, 从而减少标定结果的误差。根据该方法, 用户可自行对DMT云凝结核计数器云室过饱和比进行周期性的检验和标定, 保证高质量的云凝结核观测。

关键词: 云凝结核计数器, 过饱和比, 标定方法