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大型卧式Neophot金相显微镜具有操作简便、多种用途、鉴别率高等优点,深受使用者欢迎。该显微镜的照明系统采用两种光源:一般观察时用低压钨丝灯泡;暗视场、偏振光、相衬观察以及照相时宜改用碳弧灯。碳弧灯是靠两根粗细不同的碳棒通以电流,两碳棒之间施加一定电压,使其发生亮度极高的电弧。碳棒两顶端温度升高达数千度,同时发生强烈的辐射,称之为弧光。随着电流的增加,弧心表面亮度逐渐上升,当弧心到达一定的极限亮度以后,过分地升高电弧电流会使碳棒迅速地消耗。如果输送碳棒的装置失灵或碳棒质量差等,容易失去平衡控制,而引起在观察或照相时弧光不均匀的闪烁,影响照片质量。原机
Large horizontal Neophot metallographic microscope has the advantages of easy operation, a variety of uses, high discrimination, welcomed by users. The microscope lighting system uses two light sources: the general observation of low-voltage tungsten bulb; dark field, polarized light, phase contrast observation and photography should switch to carbon arc lamp. Carbon arc lamp is by two different thickness of the carbon rod connected to the current, the two carbon rods to exert a certain voltage, so that the occurrence of extremely high brightness arc. Both ends of the carbon rod up to several thousand degrees temperature, strong radiation occurs at the same time, call it the arc. As the current increases, the surface brightness of the arc core gradually increases. When the arc center reaches a certain limit brightness, excessive increase of the arc current causes the carbon rod to consume rapidly. If the device feeding the carbon rod fails or the quality of the carbon rod is poor, the balance control may be easily lost, causing the flash of the arc unevenly during observation or photographing, which may affect the quality of the photo. The original machine