Optimization of Offset Frequency in the SORC Pulse Sequence Using Feedback

On the NQR detection of nitrogenated substances by multi‐pulse sequences

“…And though the number of practical research works dealing with the SORC sequence ( ) x n τ ϕ τ − − [15][16][17][18] is growing, its theoretical substantiation has not been properly covered yet.…”

The Frequency Offset Effects of NQR of Spin I = 1 for Remote Detection

“…Figure 5 shows this signal in multipulse series. In contrast to numerous research works on composite pulses in NQR [16], the main purpose of composite pulses in this case is to remove the effect of the interference of inductance and echo signals in multipulse sequences of the SORC and SSFP type. During a standard sequence of two spin echo pulses /2--it is possible to damp inductance after the second pulse, thus completely removing the interference of inductance and echo signals.…”

“…It is very difficult to attain the optimal condition for the observation of the temperature of the sample and the optimal parameters of the pulse sequence in case of remote detection. Presently one tries to optimize the multipulse sequence parameters via the computation of the experimental data [4], using the experimental data [3]. The frequency offset effects are important in these data.…”

Detection of Nuclear Resonance Signals: Modification of the Receiver Operating Characteristics Using Feedback

“…In a series of earlier papers we showed that even when the exogenous inputs are unknown, it is possible to maximize the mean of the signal metric by automatically adjusting the controlled inputs (8,9). As illustrated in Fig.…”

“…We previously demonstrated that feedback can be used to optimize a single pulse parameter, either pulse width or offset frequency, in the strong off-resonant comb (SORC) sequence (8,9). By adjusting pulse parameters automatically, feedback provides a way of increasing the amplitude of the nuclear resonance signal.…”