Feedback Optimization of Pulse Width in the SORC Sequence

Jeffrey Louis Schiano, T. Routhier, A. J. Blauch, M. D. Ginsberg

    Research output: Contribution to journalArticle

    7 Citations (Scopus)

    Abstract

    A method for increasing the signal-to-noise ratio (SNR) of nuclear quadrupole resonance (NQR) measurements by automatically adjusting a pulse parameter in real-time is presented. This approach is useful in situations where the optimal pulse parameters cannot be chosen beforehand due to lack of knowledge regarding the system. For example, NQR provides a means for detecting explosives by revealing the presence of 14N. In this particular application, the distance between the search coil and the explosive, as well as the temperature of the explosive, is unknown. As a result, a fixed set of pulse parameters will not yield the largest SNR for all possible search applications. This paper describes a feedback algorithm that uses measurements of the NQR signal to automatically adjust the pulse width in the strong off-resonant comb sequence to maximize the SNR of the NQR measurement. Experimental results obtained using a sample of sodium nitrite are presented.

    Original languageEnglish (US)
    Pages (from-to)84-90
    Number of pages7
    JournalJournal of Magnetic Resonance
    Volume140
    Issue number1
    DOIs
    StatePublished - Jan 1 1999

    Fingerprint

    Nuclear quadrupole resonance
    nuclear quadrupole resonance
    Signal-To-Noise Ratio
    pulse duration
    Feedback
    Signal to noise ratio
    optimization
    signal to noise ratios
    Sodium Nitrite
    Comb and Wattles
    pulses
    nitrites
    Temperature
    coils
    adjusting
    sodium
    temperature

    All Science Journal Classification (ASJC) codes

    • Biophysics
    • Biochemistry
    • Nuclear and High Energy Physics
    • Condensed Matter Physics

    Cite this

    Schiano, Jeffrey Louis ; Routhier, T. ; Blauch, A. J. ; Ginsberg, M. D. / Feedback Optimization of Pulse Width in the SORC Sequence. In: Journal of Magnetic Resonance. 1999 ; Vol. 140, No. 1. pp. 84-90.
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    abstract = "A method for increasing the signal-to-noise ratio (SNR) of nuclear quadrupole resonance (NQR) measurements by automatically adjusting a pulse parameter in real-time is presented. This approach is useful in situations where the optimal pulse parameters cannot be chosen beforehand due to lack of knowledge regarding the system. For example, NQR provides a means for detecting explosives by revealing the presence of 14N. In this particular application, the distance between the search coil and the explosive, as well as the temperature of the explosive, is unknown. As a result, a fixed set of pulse parameters will not yield the largest SNR for all possible search applications. This paper describes a feedback algorithm that uses measurements of the NQR signal to automatically adjust the pulse width in the strong off-resonant comb sequence to maximize the SNR of the NQR measurement. Experimental results obtained using a sample of sodium nitrite are presented.",
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    Feedback Optimization of Pulse Width in the SORC Sequence. / Schiano, Jeffrey Louis; Routhier, T.; Blauch, A. J.; Ginsberg, M. D.

    In: Journal of Magnetic Resonance, Vol. 140, No. 1, 01.01.1999, p. 84-90.

    Research output: Contribution to journalArticle

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    AU - Schiano, Jeffrey Louis

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    AB - A method for increasing the signal-to-noise ratio (SNR) of nuclear quadrupole resonance (NQR) measurements by automatically adjusting a pulse parameter in real-time is presented. This approach is useful in situations where the optimal pulse parameters cannot be chosen beforehand due to lack of knowledge regarding the system. For example, NQR provides a means for detecting explosives by revealing the presence of 14N. In this particular application, the distance between the search coil and the explosive, as well as the temperature of the explosive, is unknown. As a result, a fixed set of pulse parameters will not yield the largest SNR for all possible search applications. This paper describes a feedback algorithm that uses measurements of the NQR signal to automatically adjust the pulse width in the strong off-resonant comb sequence to maximize the SNR of the NQR measurement. Experimental results obtained using a sample of sodium nitrite are presented.

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