Cross-sectional area distribution of broadband noise in a sonochemical reactor was measured to estimate reaction fields. A needle-type hydrophone scanned the sonochemical reactor in horizontal and vertical directions at one-millimeter interval. To show an absolute value of broadband noise, average of broadband sound pressure was defined. The distribution of sound pressures at the fundamental and second harmonic frequencies were also measured. In the case of driving frequency at 130 kHz, sonochemical reaction fields were observed in several ellipse shapes. The reaction fields in upper part of the reactor was high because cavitation bubbles moved upper part due to radiation force. The sound pressure distribution at the fundamental frequency showed existence of standing wave and reaction fields were weak at pressure antinode because cavitation bubbles were repelled by primary Bjerknes force. The sound pressure distribution at the second harmonic frequency indicated that the pattern of bubbles distribution resembled to that of reaction fields closely. In the case at 43 kHz, distributions of reaction fields and sound pressures were complex due to coupled vibration. The reaction fields were relatively weak in areas which had very high sound pressures at the fundamental frequency.

测量了声化学反应器中宽带噪声的截面积，以估计反应场。针型水听器以一毫米的间隔在水平和垂直方向上扫描声化学反应器。为了显示宽带噪声的绝对值，定义了宽带声压的平均值。还测量了基频和二次谐波频率的声压分布。在驱动频率为130 kHz的情况下，可以观察到几种椭圆形的声化学反应场。反应器上部的反应场高，因为空化气泡由于辐射力而移动到上部。在基波频率处的声压分布表明存在驻波，并且在压力波腹处的反应场较弱，这是因为空化气泡被主要的Bjerknes力所排斥。二次谐波频率下的声压分布表明，气泡分布的模式与反应场的模式非常相似。在43 kHz的情况下，由于耦合振动，反应场和声压的分布很复杂。在基本频率下具有很高声压的区域中，反应场相对较弱。由于耦合振动，反应场和声压的分布很复杂。在基本频率下具有很高声压的区域中，反应场相对较弱。由于耦合振动，反应场和声压的分布很复杂。在基本频率下具有很高声压的区域中，反应场相对较弱。