【摘要】 采用核孔过滤膜累积气溶胶粒子的方法设计了气溶胶粒子光吸收系数的测量系统。该系统由双光路组成,可以减小光路损耗和电路噪声带来的各种测量误差。同时,具有体积小、光路易于调节、可进行实时测量、定标容易等特点。用200和400nm孔径的过滤膜,分别测量了实验室内大气气溶胶粒子对不同波长激光的吸收系数。随着累积时间的增加,系统的测量精度也不断的提高,在累积时间为900s时,系统测量误差为9.849×10-6/m。更多还原

【Abstract】 A measurement system was made with nuclear pore filter which were used to collect atmospheric aerosol particles. We measured the absorption coefficient of light with different pore size filters in 488.0, 514.5 and 632.8nm wavelength. The system has two laser beams: the information one which transfers through glass pipe, and the reference one which transfers directly through atmosphere. In this way the measurement system can well eliminate the effect of all kinds of measurement errors caused by the optical loss, circuit noises and power fluctuation. The system also can decrease the effect of scattering for more precise measurement by partly plating highly reflective membrane. The measurement precision also advances along with increasing time of aerosol collecting. The precision is 9.849×10-6/m when the collecting time is 900s.更多还原