基于衰减器的整形脉冲

Varian公司所有新的Uinty系统NMR诺仪的观察道和去偶道都装备了由计算机控制的63dB的衰减器、线性放大器以及T/R开关的前置放大器,因此,所有的Unity系统自身都具有脉冲整形能力,在Varian的计算机系统中,采用的整形脉冲程序,是以其源码语言形式表达的,能使衰减器产生高斯脉冲,半高斯脉冲和Hermite脉冲。

ATTENUATOR-BASED SHAPED PULSES

All new UNITY systems are equipped with computer-controlled 63 dB attenuators on the observe and decouple channels,as well as with linear amplifiers and T-R switch preamplifiers.The combination of these elements means that the capability for performing shaped pulse experiments is inherent in all UNITY system.There does exist a routine in/unmr/psg named shape-pulse.c,which generates Gaussian,half-Gaussian,and hermit pulses for attenuators,and this routine is documented in the source code of the routine.