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首页> 外文会议>Interferometry '99: Applications >Plasma diagnostical investigations of high-density metal vapor discharge lamps using temporally and spatially resolved spectral interferometry
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Plasma diagnostical investigations of high-density metal vapor discharge lamps using temporally and spatially resolved spectral interferometry

机译：使用时间和空间分辨光谱干涉法对高密度金属蒸气放电灯进行等离子体诊断研究

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Abstract: An optimization of the discharge parameters of high pressure mercury lamps with respect to improved emission properties and longer lifetimes has to be performed using results of advanced model calculations. However, the reliability of these models critically depends on the availability of accurate experimental data. The aim of this work was to provide spatially resolved particle densities of neutral mercury atoms by side-on spectral interferometry. The main challenge was to find an optical arrangement that enables one to compensate for the strong wavefront distortion in the object arm caused by the extreme curvature of the bulb of the discharge lamp, a general problem in classical interferometry. The interferograms could be taken with a time-resolution of 150 $mu@s at any phase of the discharge current that varied with 50 Hz. The applied spectro- interferometric technique was a phase method developed at the institute. It supplies a highly resolved phase of the light wavefronts passing the plasma using FFT algorithms. By an Abel-inversion of the side-on data mercury density profiles could be presented for cross-sections ranging up to 10 mm as consequence of the specially designed test and reference beams in the used Mach-Zehnder interferometer.!5
机译：摘要：必须使用高级模型计算的结果来优化高压汞灯的放电参数，以改善发射特性和延长使用寿命。但是，这些模型的可靠性严重取决于准确的实验数据的可用性。这项工作的目的是通过侧面光谱干涉法提供空间分辨的中性汞原子的粒子密度。主要的挑战是找到一种光学装置，该装置能够补偿由于放电灯灯泡极度弯曲而引起的物体臂中的强波前畸变，这是传统干涉测量法中的一个普遍问题。干涉图可以在放电电流随50 Hz变化的任何相位下以150μμs的时间分辨率拍摄。应用的光谱干涉技术是该研究所开发的一种相位方法。它使用FFT算法提供通过等离子体的光波前的高度分辨相位。通过侧面数据的Abel反演，由于使用的Mach-Zehnder干涉仪中经过特别设计的测试光束和参考光束，因此可以显示横截面最大为10 mm的汞密度曲线！5

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