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NMR Spectrometers: Resolution and Error Correction01:14

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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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Target speckle correction using an array detector in heterodyne detection.

Yutao Liu, Xiaodong Zeng, Changqing Cao

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    |July 7, 2020
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    Array detectors significantly improve active heterodyne detection systems by correcting target speckle. This novel technique enhances system performance by nearly a factor of two, even with large detector arrays.

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    Area of Science:

    • Optics and Photonics
    • Signal Processing
    • Adaptive Optics

    Background:

    • Active heterodyne detection systems are susceptible to target speckle, which degrades performance.
    • Array detectors offer potential for speckle correction but face computational challenges.

    Purpose of the Study:

    • To evaluate array detectors for target speckle correction in active heterodyne detection.
    • To develop a high-speed camera heterodyne system for this purpose.
    • To propose an array grouping method to manage computational load.

    Main Methods:

    • Developed a high-speed camera heterodyne system operating at 100 kfps.
    • Divided heterodyne images into array signals for phase adjustment.
    • Employed adaptive particle swarm optimization for phase adjustment.
    • Introduced an array grouping method to address computational limitations.

    Main Results:

    • The array detector technique achieved an enhancement of nearly a factor of two for a 20x20 detector array.
    • Demonstrated significant improvement in heterodyne system performance in the presence of target speckle.
    • The array grouping method effectively overcame computational power limitations.

    Conclusions:

    • Array detectors are highly effective for target speckle correction in active heterodyne detection.
    • The developed system and array grouping method offer a practical solution for enhancing heterodyne system performance.
    • This approach significantly boosts the robustness of heterodyne systems against speckle interference.