Time-synchronized continuous wave laser-induced fluorescence on an oscillatory xenon discharge.
Time-synchronized continuous wave laser-induced fluorescence on an oscillatory xenon discharge.
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振荡氙放电上的时间同步连续波激光诱导荧光。
DOI：
10.1063/1.4766958
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发表时间：
2012
影响因子：
1.6
通讯作者：
W. Hargus
中科院分区：
文献类型：
--
作者：
N. A. MacDonald;M. Cappelli;W. Hargus
提出了一种利用连续波激光器将激光诱导荧光测量与60 Hz氙灯振荡电流时间同步的新方法。实施采样保持电路以分离出沿着电流周期的不同相位处的信号，并且随后是锁定放大器以从大的背景信号中拉出所得到的时间同步的荧光迹线。用激光诱导荧光法测量了氙原子在λ = 834.68 nm处的6s（'）[1/2]（1）（0）-6p（'）[3/2]（2）跃迁的荧光激发线形状，并根据激发线强度的变化，导出了低能级布居的时间演化。结果表明，较低的状态人口振荡的两倍的放电电流的频率，120 Hz。
A novel approach to time-synchronizing laser-induced fluorescence measurements to an oscillating current in a 60 Hz xenon discharge lamp using a continuous wave laser is presented. A sample-hold circuit is implemented to separate out signals at different phases along a current cycle, and is followed by a lock-in amplifier to pull out the resulting time-synchronized fluorescence trace from the large background signal. The time evolution of lower state population is derived from the changes in intensity of the fluorescence excitation line shape resulting from laser-induced fluorescence measurements of the 6s(')[1/2](1)(0)-6p(')[3/2](2) xenon atomic transition at λ = 834.68 nm. Results show that the lower state population oscillates at twice the frequency of the discharge current, 120 Hz.