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光谱分析中广泛采用高频引燃低压交流电弧,利用高频引燃回路的高频电流耦合到电弧回路,击穿分析间隙。(1) 这也就是平常所说的高频电花引燃。金属电极在激发过程中,由于空气的氧化作用在电极表面复上一层导电性能极差的氧化膜,致使放电不能正常进行,放电点会游移至侧面。所以有人主张在激发前先将金属棒电极进行预氧化处理,以防止上述现象的出现。(2)光源的稳定性很大程度上决定于引燃的稳定性。为了保证激发平稳极易电离导通,在“电弧”工作状态、“低压火花”工作状态或“高频火花”状态,一般都在分析间隙间加装一只直针形的金属电离针,即电极活化针。在分析间隙之间加装一只引发电离针,系利用了电离针的尖端放电作用,增强局部的电场强度,并改变上下电极间的电场分布,使空气中的离子(宇宙线等引起的)在合成电场作
Spectral analysis is widely used in high-frequency low-voltage ignition of AC arc, the use of high-frequency ignition circuit of high-frequency current coupled to the arc circuit, breakdown analysis gap. (1) This is what is commonly called high-frequency electric ignition. Metal electrode in the excitation process, due to the oxidation of air in the electrode surface complex with a very poor conductivity of the oxide film, resulting in discharge can not be normal, the discharge point will migrate to the side. Therefore, some people advocate that before the metal electrode pre-oxidation electrode to prevent the occurrence of these phenomena. (2) The stability of the light source depends largely on the stability of ignition. In order to ensure that the excitation is smooth and easy to be ionized and turned on, a straight pin-shaped metal ionization needle is usually installed between the analysis gaps in the “arc” working state, the “low-pressure sparking” working state or the “high-frequency sparking” Electrode activation needle. In the analysis of the gap between the installation of a trigger ionization needle, the use of the ionization needle tip discharge, enhance the local electric field strength, and change the electric field distribution between the upper and lower electrodes, so that the air ions (caused by cosmic rays, etc.) In the electric field for synthesis