High-performance photoelastic modulator for polarization modulation spectrometer.

Enantiomer Pub Date : 2002-07-01 DOI:10.1080/10242430212885
S. Maeda, K. Nakae, Y. Shindo
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引用次数: 4

Abstract

A high-performance photoelastic modulator (PEM) has been built. It consists of a home-made PEM head and a home-built PEM driver that is based on the principle of the phase-locked loop (PLL) (PLL PEM driver). It was installed in our new type circular dichroism (CD) spectrometer for visible light region and its performance was evaluated. With the phase angle being set exactly to zero, the PEM is found to be about eight times more efficient than commercially available one. The efficiency of PEM depends not only on the efficiency of PEM driver but also on the quality of PEM head. The latter can be estimated from admittance-parameter measurements without installing it into a spectrometer. With substituting the PLL PEM driver for a conventional one, the PEM drive voltage can be reduced from one-half to one-third and the baseline shift for air blank that is a measure of the total performance of polarization modulation spectrometers becomes quite small.
用于偏振调制光谱仪的高性能光弹性调制器。
构建了一种高性能光弹性调制器(PEM)。它由一个国产的PEM头和一个国产的基于锁相环(PLL)原理的PEM驱动器(PLL PEM驱动器)组成。将其安装在我们研制的新型可见光区圆二色谱仪中,并对其性能进行了评价。通过将相位角精确地设置为零,发现PEM的效率是商用PEM的8倍左右。电源的效率不仅取决于电源驱动器的效率,还取决于电源头的质量。后者可以通过导纳参数测量来估计,而无需将其安装到光谱仪中。用锁相环PEM驱动器代替传统的PEM驱动器,PEM驱动电压可以从二分之一降低到三分之一,空气空白的基线位移(衡量偏振调制光谱仪的总性能)变得相当小。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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