Design Of A Saturation Burst Generator For Pulse Programmer

Kendy, Maloi (2005) Design Of A Saturation Burst Generator For Pulse Programmer. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

A digital pulse programmer producing the standard pulse sequence required for pulsed nuclear magnetic resonance spectroscopy is described easily modified to produce more spe1cialized pulse sequences. Pulse programmer provided the two-pulse sequences for 90°- 90° and 180° - 90°. The saturation burst generator produces a sequence of pulses to provide a pseudo-90° pulse useful for the measurement of long relaxation times in solids. This sequence consists of few different pulses of equal separation time. ln the simulation part, the input pulse is generated from the pulse sources. The pulse input is supplied to the circuit. During this sequence the input to the decade scaler will be interrupted, and the time base is reset on the last pulse in the sequence. In this way, all delayed pulses following the pseudo-90° pulse will 01ccur at times measured from the beginning of the final pulse in the saturation burst. The input frequency will be divided by a counter and a decoder. In the hardware method, a switch would be used to determine the frequency division by resetting the counter when the desired divisor is achieved. The wiper of switch will provide the pulses for the 90° saturation burst pulses.

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