Choi Kwangseok, Mogami Tomofumi, Suzuki Teruo
National Institute of Occupation Safety and Health, 1-4-6 Umezono, Kiyose, Tokyo, Japan.
Kasuga Denki, Inc., 2-4 Shin-Kawasaki, Saiwai-ku, Kawasaki, Kanagawa, Japan.
Rev Sci Instrum. 2014 Apr;85(4):045001. doi: 10.1063/1.4868234.
To detect electrostatic discharges generated by polymer granules within a metal silo, we developed a novel and simple electrostatic discharge detector that utilizes a photosensor. The novel detector consists of a photosensor module in a metal cylinder, an optical band-pass filter, a quartz glass, a power supply, an amplifier for the photosensor module, and a digital oscilloscope. In this study, we conducted experiments at a real pneumatic powder transport facility that includes a metal silo to evaluate the novel detector using polypropylene granules. To determine the performance of the novel detector, we observed the electrostatic discharge within the metal silo using a conventional image intensifier system. The results obtained from the experiments show that the novel detector worked well in this study. The signals obtained with the novel detector were identical to the electrostatic discharges obtained with the conventional image intensifier system. The greatest advantage of this novel detector is that it is effective even when placed under external lights. In addition, the influence of various optical band-pass filters on the performance of the novel detector was discussed. Our study confirmed that an optical band-pass filter with a center wavelength of λ 330 nm (λ1/2: 315-345 nm) was the best performer among the optical band-pass filters used in this study.
为了检测金属筒仓内聚合物颗粒产生的静电放电，我们开发了一种新颖且简单的利用光电传感器的静电放电探测器。这种新型探测器由金属圆筒内的光电传感器模块、光学带通滤波器、石英玻璃、电源、用于光电传感器模块的放大器以及数字示波器组成。在本研究中，我们在一个包括金属筒仓的实际气力粉末输送设施上进行实验，以使用聚丙烯颗粒评估这种新型探测器。为了确定新型探测器的性能，我们使用传统的图像增强器系统观察金属筒仓内的静电放电。实验结果表明，这种新型探测器在本研究中运行良好。新型探测器获得的信号与传统图像增强器系统获得的静电放电信号相同。这种新型探测器的最大优点是即使放置在外部灯光下也有效。此外，还讨论了各种光学带通滤波器对新型探测器性能的影响。我们的研究证实，中心波长为λ 330 nm（λ1/2：315 - 345 nm）的光学带通滤波器是本研究中使用的光学带通滤波器中性能最佳的。
