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Updated: Jun 12, 2026

Picometer-Precision Atomic Position Tracking through Electron Microscopy
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Centroid position measurements and subpixel sensitivity variations with the MAMA detector.

J S Morgan, D C Slater, J G Timothy

    Applied Optics
    |June 16, 2010
    PubMed
    Summary

    Measurements show visible-light multi-anode microchannel array (MAMA) detectors achieve sub-pixel position accuracy. However, sensitivity variations impact photometric accuracy, though newer designs may resolve this issue.

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    Area of Science:

    • Astronomy
    • Astrophysics
    • Detector Physics

    Background:

    • Multi-anode microchannel array (MAMA) detectors are crucial for astronomical observations.
    • Understanding detector limitations is key to accurate photometric measurements.

    Purpose of the Study:

    • To assess the position sensitivity of visible-light MAMA detectors.
    • To identify factors limiting photometric accuracy in MAMA detectors.

    Main Methods:

    • Utilized delta function sources to measure position sensitivity.
    • Quantified subpixel sensitivity variations across the detector array.
    • Investigated cross-coupling effects within the anode array.

    Main Results:

    • Achieved position accuracy better than 0.04 pixels for image spots.

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    Last Updated: Jun 12, 2026

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  • Observed subpixel sensitivity variations of 10-15%, up to 30% in worst cases.
  • Identified anode array cross-coupling as a limiter of photometric accuracy.

    • Conclusions:

    • Visible-light MAMA detectors demonstrate high position sensitivity.
    • Anode cross-coupling significantly impacts photometric accuracy for small-scale features.
    • Recent MAMA detector designs show promise in mitigating cross-coupling issues.