自由感应衰减

它利用脉冲傅立叶变换技术，将获得的核自由感应衰减信号或回波信号进行相干累加以提高信噪比。

It uses the pulsed Fourier transform technique to acquire FID or echo signals for coherent accumulations .

自由感应衰减信号经过32k傅立叶变换转为一维NMR谱图。

Free induction decay signals were transferred into one-dimensional NMR spectrogram via 32 k Fourier transformation .

稀土粉末Eu∶Y2O3的自由感应衰减量子拍

Free Induction Decay Quantum Beating in Eu ∶ Y_2O_3 Powder

介绍了将小波多分辨分析（MRA）用于核磁共振（NMR）自由感应衰减（FID）信号的水峰抑制。

Wavelet multi-resolution analysis has been used for suppressing water peak in free induced signals of NMR .

基于作者先前提出的过抽样实值离散Gabor变换，本文提出了一有效的算法用于核磁共振自由感应衰减（NMRFID）信号的减噪。

An efficient algorithm is proposed to reduce the noise in NMR FID signals based on the real-value discrete Gabor transformation developed in our previous work .

它是测量油料种子的固相（蛋白质和碳水化合物）和液相（油）的自由感应衰减（FID）信号。

It is based on the measurement of the free induction decay ( FID ) signal of the solid phase ( protein and carbo hydrate ) and the liquid phase ( oil ) of oilseed .

这一章从低场NMR的历史、特点出发，介绍了核磁共振现象中自由感应衰减（FID）信号和自旋回波（spin-echo）信号的获得原理、整个实验系统的测量装置和电路分析。

This chapter starts from the history and characteristics of the low-field NMR , then introduces the phenomenon of nuclear magnetic resonance free induction decay ( FID ) signal and spin-echo signal and their obtaining principle , and the entire experiment measuring devices and circuit analysis .

结果表明：与非波导情况相比，空心平板光波导中的光学自由感应衰减有许多不同的性质。

It has been shown that the optical free induction decay in hollow slab optical waveguides has a lot of different properties from those in non-waveguides .