Krompholz H, Fischer H
Appl Opt. 1974 Jan 1;13(1):203-5. doi: 10.1364/AO.13.000203.
Spectral radiances R(lambda) and luminances B in the center axis of high density 8-20-nsec spark channels as produced by Nanolite sources were systematically studied by comparison with the emission from a calibrated dc-carbon arc. The maximum value of R(lambda) was 53 W cm(-2) A(-1) sr(-1) in 1 atm of air at 4850 A with a breakdown voltage of 2.5 kV when the Nanolite (C = 2.9 nF, L = 2 nH) was charged slowly. This value increased to over 70 W cm(-2) A(-1) sr(-1) when the source was pulse charged. Saturation values of R(lambda) were 38 W cm(-2) A(-1) sr(-1) in 3 atm of argon and 60 W cm(-2) A(-1) sr(-1) in 32 atm of helium (slow charged). All values were reproducible to within 10%, the absolute error being estimated to be smaller than +/-20%. Equivalent maximum blackbody temperatures of the channel surface in air were 62,000 K (pulse charged) and 38,000 K in argon and 54,000 K in helium (slowly charged). Maximum spectral radiant intensity in 1 atm of air was 0.18 W A(-1) sr(-1) at 4850 A (pulse charged).
通过与校准后的直流碳弧发射进行比较，系统地研究了由纳米光源产生的高密度8 - 20纳秒火花通道中心轴上的光谱辐射率R(λ)和亮度B。当纳米光源（C = 2.9 nF，L = 2 nH）缓慢充电时，在4850 Å的1个大气压空气中，R(λ)的最大值为53 W cm⁻² A⁻¹ sr⁻¹，击穿电压为2.5 kV。当光源进行脉冲充电时，该值增加到超过70 W cm⁻² A⁻¹ sr⁻¹。在3个大气压的氩气中，R(λ)的饱和值为38 W cm⁻² A⁻¹ sr⁻¹，在32个大气压的氦气中（缓慢充电）为60 W cm⁻² A⁻¹ sr⁻¹。所有值的可重复性在10%以内，估计绝对误差小于±20%。空气中通道表面的等效最大黑体温度在脉冲充电时为62,000 K，在氩气中为38,000 K，在氦气中（缓慢充电）为54,000 K。在1个大气压空气中，4850 Å处的最大光谱辐射强度为0.18 W A⁻¹ sr⁻¹（脉冲充电）。
