In Fourier transform nuclear magnetic resonance spectroscopy, free induction decay (FID) is the observable nuclear magnetic resonance (NMR) signal generated by non-equilibrium nuclear spin magnetization precessing about the magnetic field (conventionally along z).

自由感应衰减(free induction decay, FID)是 核磁共振 (NMR)与磁共振成像 (MRI)中最简单的 信号 形式。 受激发的核种对磁共振频谱仪或磁共振成像扫描仪的 射频 线圈 造成感应电流而产生信号，并且因发生 驰豫 而使信号强度逐渐衰减至零，这种逐渐衰减的信号即称为 ...

The signal we detect is called a Free Induction Decay and is produced by the macroscopic magnetization after the pulse. The magnetization will undergo several processes as it returns to equilibrium. …

2007年8月23日 · Zero Filling FID manipulation When an FID is Fourier transformed, the data (np, or number of points) consists of 2 parts. Real points (np/2) from the cosine portion. Imaginary points (np/2) from the sine portion, which are not displayed in the actual spectrum. Zero filling doubles number of real points used by adding an equal number of zeroes.

2024年1月14日 · 自由感应衰减 (free induction decay, FID)是 核磁共振 (NMR)与 磁共振成像 (MRI)中最简单的 信号 形式。 受激发的核种对磁共振频谱仪或磁共振成像扫描仪的 射频 线圈 造成感应电流而产生信号，并且因发生 驰豫 而使信号强度逐渐衰减至零，这种逐渐衰减的信号即称为 ...

按照之前的操作方式，添加一个90° RF pulse，撤去pulse后得到的信号称为是Free induction decay (FID)信号。 实际中，由于外磁场的不均匀，导致即前面所述的 T^ {*}_ {2} relaxation比 T_ {2} relaxation快的问题，可以通过在90°pulse之后加个180°pulse（Refocusing pulse）来补偿，这 …

This is called a free induction decay signal, abbreviated FID. Free Induction Decay Signal Since, the FID signal collected after one pulse, may be stored and averaged with the FID's from many other identical pulses prior to the Fourier transform, the NMR signal strength from a small sample may be enhanced to provide a useable spectrum.

2025年2月3日 · In this study, we demonstrate that neural networks can replace FT in NMR spectroscopy, enabling robust and rapid prediction of spectra and peak lists from FID signals. Our results confirm that deep learning can efficiently process NMR data to generate final spectra.

What is a free induction decay (FID)? In their famous experiments of 1946, Bloch, Purcell, and colleagues employed a continuous wave (CW) technique using a fixed frequency RF field (1) while the main magnetic field (o) was swept through resonance.

2021年5月20日 · NMR users can deal with spectrum evaluation in the daily work, but how is the spectrum information stored in the time domain (FID)? The origin of the NMR signal comes from the application of a radiofrequency pulse that moves the net magnetization from the equilibrium…