Measurement of optical properties of black carbon aerosols with the photoacoustic technique

为了认识和预测气候变化，测量黑碳气溶胶（BC）的光吸收或大气加热是必不可少的。虽然其他材料的涂层可以增强BC光的吸收，但传统技术无法高精度测量BC光的吸收和涂层的增强。本研究采用光声技术对其进行了测量。在室内人工BC实验中，精确测量了涂层对BC光的吸收和增强，结果表明，随着涂层厚度的增加，BC光的吸收增加了1.5 ~ 2.0倍。在本研究中，还测量了BC光吸收和涂层效应。

For the understanding and the prediction of the climate change, it is essential to measure the light absorption, or the atmospheric heating, by black carbon aerosols (BC). Although the BC light absorption can be enhanced with the coating of other material, high-precision measurement of BC light absorption and the enhancement with the coating is impossible with conventional techniques. This study succeeded in them by adopting photoacoustic technique measuring. In a laboratory experiment using artificial BC, the BC light absorption and the enhancement with the coating have been precisely measured to show that it increased by a factor between 1.5 and 2.0 with the thickness of the coating. In this study, the BC light absorption and the coating effect have also been measured.