A number of metal cirque electrodes surround equidistantly outside the glass discharge tube , acting as preionization electrodes 在玻璃放电管的外表面紧密套上若干圆环形电极,作为预电离电极。
Another is " helical transverse - pulsed preionization " . two comparatively parallel copper foil strips surround helically outside the glass discharge tube , acting as preionization electrodes 在玻璃放电管的外表面螺旋地粘上两条相对平行的金属箔,作为预电离电极。