Purdue Interdepartmental NMR Facility, Purdue University, West Lafayette, IN 47907, USA.
Magn Reson Chem. 2010 Mar;48(3):235-8. doi: 10.1002/mrc.2563.
The observed NMR signal size depends on the receiver gain parameter. We propose a receiver gain function to characterize how much the raw FID is amplified by the receiver as a function of the receiver gain setting. Although the receiver is linear for a fixed gain setting, the actual gain of the receiver may differ from what the gain setting suggests. Nevertheless, for a given receiver, we demonstrate that the receiver gain function can be calibrated. Such a calibration enables accurate comparison of separately acquired NMR signals in quantitative analysis, which frequently requires different receiver gain settings to avoid receiver saturation or achieve optimum sensitivity. The application of receiver gain function, along with the definition of receiving efficiency, allows easy concentration determination by a single internal or external concentration reference.
观测到的 NMR 信号强度取决于接收器增益参数。我们提出了一个接收器增益函数，以表征接收器在接收器增益设置下对原始 FID 的放大程度。尽管接收器在固定增益设置下是线性的，但接收器的实际增益可能与增益设置所暗示的不同。然而，对于给定的接收器，我们证明可以对接收器增益函数进行校准。这种校准使得在定量分析中对单独采集的 NMR 信号进行准确比较成为可能，这通常需要不同的接收器增益设置以避免接收器饱和或达到最佳灵敏度。接收器增益函数的应用，以及接收效率的定义，允许通过单个内部或外部浓度参考轻松确定浓度。
