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Advantages of digital phase-sensitive detection for upgrading an obsolete CW EPR spectrometer

机译：数字相敏检测在升级陈旧的CW EPR光谱仪方面的优势

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摘要

The replacement of the commonly used analog phase-sensitive detection (PSD) by digital PSD for demodulation of electron paramagnetic resonance (EPR) signals is suggested for upgrading of an out-of-date EPR spectrometer. Connection of the microwave bridge output to a fast analog-digital converter (ADC) eliminates some of the spectrometer's components: the electronics responsible for analog PSD, ADC for sampling of demodulated signals, and a computer, as well as the usage of some of the spectrometer's settings. The spectrometer is reduced to a magnet, microwave bridge, and personal computer containing an ADC board. EPR signals digitized for a set of magnetic field positions form a two-dimensional array which is stored in a personal computer. Demodulation and filtering are done numerically to produce a conventional EPR spectrum. In comparison with analog PSD, this numerical approach does not eliminate the out-of-phase component of the signal and the signals at the higher harmonics of the modulation frequency. The details of modernizing the Bruker ER200E SRC EPR spectrometer are discussed to demonstrate these and other advantages of digital demodulation.
机译：建议用数字PSD代替常用的模拟相敏检测（PSD）来解调电子顺磁共振（EPR）信号，以升级过时的EPR光谱仪。微波桥输出与快速模数转换器（ADC）的连接省去了光谱仪的某些组件：负责模拟PSD的电子设备，用于解调信号采样的ADC和计算机，以及其中一些组件的使用。光谱仪的设置。光谱仪简化为磁铁，微波桥和包含ADC板的个人计算机。针对一组磁场位置进行数字化的EPR信号形成二维阵列，存储在个人计算机中。数字解调和滤波以生成常规EPR频谱。与模拟PSD相比，这种数值方法不能消除信号和调制频率较高谐波信号的异相分量。讨论了布鲁克ER200E SRC EPR光谱仪现代化的细节，以演示数字解调的这些和其他优点。

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