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Related Concept Videos

Aliasing01:18

Aliasing

Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original signal...
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...

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Related Experiment Video

Updated: Jun 9, 2026

Live Cell Imaging of F-actin Dynamics via Fluorescent Speckle Microscopy (FSM)
19:16

Live Cell Imaging of F-actin Dynamics via Fluorescent Speckle Microscopy (FSM)

Published on: August 5, 2009

Digital speckle-displacement measurement using a complex spectrum method.

D J Chen, F P Chiang, Y S Tan

    Applied Optics
    |September 8, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces an automated method for measuring speckle displacement using digital image correlation. The technique accurately quanties deformation fields, enhancing optical speckle photography applications.

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    Area of Science:

    • Optical Metrology
    • Materials Science
    • Solid Mechanics

    Background:

    • Optical speckle photography is a powerful technique for measuring surface deformation.
    • Fully automatic speckle-displacement measurement methods often face limitations in accuracy and range.

    Purpose of the Study:

    • To present an alternative, fully automatic approach for speckle-displacement measurement.
    • To enhance the capabilities of optical speckle photography for deformation analysis.

    Main Methods:

    • Capturing two speckle patterns (before and after deformation) using a CCD camera.
    • Segmenting patterns into subimages and analyzing pairs using a two-step Fast Fourier Transform (FFT).
    • Employing subpixel-maximum determination via biparabolic fitting for accurate displacement vector resolution.

    Main Results:

    • Successfully deduced u- and v-displacement fields from analyzed subimage pairs.
    • Overcame large rigid-body displacements by introducing an artificial rigid shift.
    • Demonstrated successful application to study crack-tip deformation fields.

    Conclusions:

    • The developed technique offers an extended measurement range and retains advantages of optical speckle photography.
    • Dynamic incremental deformations can be inspected using high-speed CCD cameras.
    • The method provides a robust and accurate approach for full-field displacement measurement.