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1. 发明授权

US4888554A Electron paramagnetic resonance (EPR) spectrometer 失效
标题翻译：电子顺磁共振（EPR）光谱仪
公开(公告)号：US4888554A
公开(公告)日：1989-12-19
申请号：US227288
申请日：1988-08-02
申请人： James S. Hyde , Jerzy Gajdzinski
发明人： James S. Hyde , Jerzy Gajdzinski
IPC分类号： G01R33/60
CPC分类号： G01R33/60
摘要： An electron paramagnetic resonance (EPR) spectrometer employing a reference arm microwave bridge provides efficient, simultaneous generation of orthogonal I and Q signals. The simultaneous generation is enabled through the use of a field effect transistor (FET) microwave amplifier in the signal arm feeding a balanced quadrature mixer. The I and Q signals are then combined to produce a signal suitable for use as a discriminator in an automatic frequency control (AFC) circuit. An important characteristic of the discriminator signal is that it is independent of the relative phase angle .alpha. between the reference arm and signal arm of the bridge. In a further embodiment, an apparatus is disclosed which computes .alpha. from the I and Q signals, and uses the computed value for .alpha. to extract pure absorption and pure dispersion information from the I and Q signals regardless of the setting of .alpha. in the bridge.
摘要翻译：使用参考臂微波桥的电子顺磁共振（EPR）光谱仪提供了正交I和Q信号的有效同时产生。通过在馈送平衡正交混频器的信号臂中使用场效应晶体管（FET）微波放大器来实现同时发生。然后将I和Q信号组合以产生适合用作自动频率控制（AFC）电路中的鉴频器的信号。鉴别器信号的一个重要特征是它独立于参考臂与桥臂的信号臂之间的相对相位角α。在另一个实施例中，公开了一种从I和Q信号计算α的装置，并且使用所计算的α值从I和Q信号中提取纯吸收和纯色散信息，而不管桥中的α的设置如何。

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