【摘要】 利用差动式探测方法研究了气泡的光学性质,实验选择的采样频率3kHz适合实验中信号的采集,符合采样定理。实验表明,无气泡幕时透射光信号仅有一些杂乱的微小波动,在低频段强度的浮动在200Hz以内,越往高频强度越小,在1kHz以后强度几乎为零,所以信号频谱反映了信号的波动情况,可以用频谱来表示光强信号的宏观特性。对于单个气泡的研究表明,理论结果与实验波形的变化趋势相同,波动总的浮动点数相同,理论与实验结果基本相符。更多还原

【Abstract】 The optical property of bubble film is studied by using differential exploration. The sampling frequency is 3 kHz, and it agrees with the signal collection and coincides with sampling theorem. According to the experimental results, transmission popples mildly without bubble film. Intensity in low frequency range fluctuates within 200 Hz and rises at high frequency until nearly to null at 1 kHz or above. Signal frequency spectrum reflects its wave, one can denote macroscopical peculiarity of optical intensity using its frequency spectrum. Result of single bubble study shows that the experimental result is in agreement with that of theory.更多还原