Fischer H, Schwdnzer W
Appl Opt. 1969 Mar 1;8(3):697-9. doi: 10.1364/AO.8.000697.
Time functions of the radiance (ITT FW-114, spectral response S-4) were observed, as well as the radiant intensity of high pressure spark channels in argon and helium with pressures between 1 atm and 40 atm, and a constant gap of 0.65 mm. The radiance, as well as radiant intensity, first increases exponentially with pressure and breakdown voltage; later, the radiance curves bend into a saturation plateau in both gases. On the other hand, the radiant intensity does not reach saturation, but shifts its maximum up to 50 nsec after the 8-nsec current maximum. The shift of the radiant intensity and saturation are related and result from the increasing opacity of the channel. The observed 1.65 ratio of the saturation radiances of helium and argon agrees with values reported in microsecond spark channels which have a diameter approximately six times wider.
观测了辐射率（ITT FW - 114，光谱响应S - 4）的时间函数，以及氩气和氦气中高压火花通道在1个大气压至40个大气压之间、恒定间隙为0.65毫米时的辐射强度。辐射率以及辐射强度首先随压力和击穿电压呈指数增加；之后，两种气体中的辐射率曲线都弯曲成饱和平台。另一方面，辐射强度未达到饱和，而是在8纳秒电流最大值之后最多50纳秒时将其最大值上移。辐射强度的偏移和饱和是相关的，并且是由通道透明度增加导致的。观测到的氦气和氩气饱和辐射率的1.65比率与直径大约宽六倍的微秒级火花通道中报告的值相符。
