We developed a new simple apparatus for measuring both the size and the charge of fine particles from the amplitude and the phase shift of the particle oscillation in AC electric field. This apparatus composed of a digital camera, parallel plate electrodes, a high voltage AC source, an illuminating lamp and a flush lamp. The amplitude and the phase shift of each particle were measured from the image obtained by a digital camera. Measurements for multiple particles are carried out at the same time using this apparatus. The performance of the apparatus was confirmed by using glass beads of 30 /spl mu/m diameter and toner particles of 10 /spl mu/m diameter. Both the size and the charge can be measured within a few percent error.
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机译：我们开发了一种新的简单设备，用于根据交流电场中颗粒振荡的幅度和相移来测量细颗粒的大小和电荷。该设备由数码相机，平行板电极，高压交流电源，照明灯和冲洗灯组成。从数字照相机获得的图像测量每个粒子的振幅和相移。使用该设备可同时进行多个颗粒的测量。通过使用直径为30μg/splμm/ m 2的玻璃珠和直径为10μg/splμm/ m 2的调色剂颗粒来确认设备的性能。尺寸和电荷都可以在百分之几的误差范围内进行测量。
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