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首页> 外文期刊>Applied Magnetic Resonance >Using of Digital Demodulation of Multiharmonic Overmodulated EPR Signals to Improve EPR Oximetry Reliability
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Using of Digital Demodulation of Multiharmonic Overmodulated EPR Signals to Improve EPR Oximetry Reliability

机译：使用多谐波过调制EPR信号的数字解调来提高EPR血氧饱和度的可靠性

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摘要

Overmodulation of electron paramagnetic resonance (EPR) lines is routinely used in EPR oximetry in order to increase the signal-to-noise ratio and thus to improve the accuracy with which the line width of a spin probe can be measured. For a known probe type, the line width is easily translated into the oxygen partial pressure. A standard EPR spectrometer uses the analog phase-sensitive detection (PSD) to demodulate the EPR signal. PSD imposes the restriction that only one spectrum is measured at a time, which is normally the first-harmonic EPR line. Information about EPR signals centered at the other harmonics of the modulation frequency is irreversibly destroyed by PSD. The question is raised whether this information can be utilized for EPR oximetry, for overmodulation enhances the second- and the other harmonic spectra, so that they approach the first-harmonic spectrum in intensity. To find an answer, numerical simulation and experimental measurements have been conducted. The experiment required modification of the detection scheme, so that all EPR-related information in the overmodulated signal is preserved. This permits measuring of the multiharmonic EPR spectrum, which when fitted to a set of the corresponding theoretical lines produces more accurate results in comparison with the standard overmodulation method.
机译：EPR血氧饱和度测定法通常使用电子顺磁共振（EPR）线的过调制，以提高信噪比，从而提高自旋探针线宽的测量精度。对于已知的探头类型，线宽很容易转换为氧气分压。标准EPR光谱仪使用模拟相敏检测（PSD）解调EPR信号。 PSD的限制是一次只能测量一个频谱，通常是一次谐波EPR线。 PSD不可逆地破坏有关以调制频率的其他谐波为中心的EPR信号的信息。提出了一个问题，即该信息是否可以用于EPR血氧饱和度测定，因为过调制会增强二次谐波和其他谐波频谱，从而使它们的强度接近一次谐波频谱。为了找到答案，已经进行了数值模拟和实验测量。实验要求修改检测方案，以便保留过调制信号中所有与EPR相关的信息。这允许测量多谐波EPR频谱，与标准的过调制方法相比，将其拟合到一组相应的理论线时可以产生更准确的结果。

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