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Related Concept Videos

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single stretching vibration...

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Updated: Jun 25, 2026

Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
10:28

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Imaging a vibrating object by Sideband Digital Holography.

F Joud1, F Laloë, M Atlan

  • 1Laboratoire Kastler Brossel, UMR 8552 Ecole Normale Supérieure, UPMC, CNRS 24 rue Lhomond, 75231 Paris Cedex 05, France.

Optics Express
|February 17, 2009
PubMed
Summary
This summary is machine-generated.

Sideband digital holography quantitatively measures vibration amplitudes of objects. This technique allows for precise measurement of oscillations larger than optical wavelengths, revealing vibration shapes.

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Area of Science:

  • Optics and Photonics
  • Vibrational Analysis
  • Metrology

Background:

  • Accurate measurement of object oscillation amplitude is crucial in various scientific and engineering fields.
  • Traditional methods may have limitations in measuring large amplitudes or reconstructing complex vibration shapes.

Purpose of the Study:

  • To introduce and validate a novel method for quantitative measurement of oscillation amplitudes using sideband digital holography.
  • To demonstrate the capability of the technique in measuring amplitudes significantly larger than the optical wavelength.
  • To reconstruct the vibration shape of an object.

Main Methods:

  • Utilizing sideband digital holography with heterodyne detection to selectively capture frequency sidebands.
  • Calculating object images for different diffraction orders (n) corresponding to multiples of the vibration frequency.
  • Analyzing the intensity zeros for each order to reconstruct the vibration shape.

Main Results:

  • Successfully obtained quantitative measurements of oscillation amplitudes.
  • Observed diffraction orders up to n = 120, indicating high sensitivity and dynamic range.
  • Demonstrated the ability to measure amplitudes substantially larger than the optical wavelength.
  • Reconstructed the vibration shape of the object based on intensity zero positions.

Conclusions:

  • Sideband digital holography provides a powerful tool for precise, quantitative measurement of large oscillation amplitudes.
  • The method enables detailed reconstruction of object vibration shapes.
  • This technique has significant potential for applications in fields requiring accurate dynamic analysis of vibrating structures.