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Doppler Effect - II

Doppler Effect - II

The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...

Doppler Effect - I

Doppler Effect - I

The Doppler effect and Doppler shift were named after the Austrian physicist and mathematician Christian Johann Doppler in 1842, who conducted experiments with both moving sources and moving observers. Consider an observer standing on a street corner, observing an ambulance with a siren sound passing by at a constant speed. The observer experiences two characteristic changes in the sound of the siren. Initially, the sound increases in loudness as the ambulance approaches and decreases in...

Relative Motion Analysis using Rotating Axes

Relative Motion Analysis using Rotating Axes

Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
However, to express the relative position of point B relative to point A, an additional frame of reference, denoted as x'y', is necessary. This additional frame not only translates but also rotates relative to the fixed frame, making it instrumental in...

Rotational Motion about a Fixed Axis

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A rigid body's rotation around a fixed axis makes every point within it trace a circular path around a specific line or point. The term given to this type of spinning is defined by the angular position, symbolized by the angle θ. This angle is gauged from a static reference line to the revolving object. From this angular position, any variation is referred to as angular displacement, denoted by dθ. The extent of this displacement can be calculated in degrees, radians, or revolutions, where one...

Relative Motion Analysis using Rotating Axes - Acceleration

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Relative Motion Analysis using Rotating Axes-Problem Solving

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Related Experiment Video

Updated: Jun 16, 2026

Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects

Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects

Published on: February 8, 2014

Holographic Doppler imaging of rotating objects.

C C Aleksoff, C R Christensen

|February 6, 2010

Summary

This study uses Doppler frequency shifts from rotating objects to achieve superresolution imaging, significantly surpassing classical limits. Modulated-reference-wave holography enables enhanced resolution beyond 200 times the classical limit with good signal-to-noise ratios.

Area of Science:

Optics and Photonics
Image Processing
Holography

Background:

Classical imaging systems are limited by diffraction, restricting resolution.
Achieving superresolution typically requires complex techniques or specialized setups.
Doppler frequency shifts offer a unique physical property for image analysis.

Purpose of the Study:

To develop a novel imaging technique for superresolution beyond classical limits.
To leverage Doppler frequency shifts for enhanced one-dimensional resolution.
To utilize modulated-reference-wave holography for image reconstruction.

Main Methods:

Utilizing the Doppler frequency shift of coherent light reflected from rotating objects.
Processing Doppler information via temporal and spatial filtering properties of modulated-reference-wave holograms.

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Last Updated: Jun 16, 2026

Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects

Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects

Published on: February 8, 2014

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

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Employing holographic reconstruction to generate a superresolved image.

Main Results:

Achieved one-dimensional resolution significantly greater than the classical aperture limit.
Demonstrated resolution improvements exceeding 200 times the classical limit.
Obtained superresolved images with good signal-to-noise ratios.

Conclusions:

Modulated-reference-wave holography combined with Doppler information processing is an effective method for superresolution imaging.
This technique overcomes classical resolution limitations in imaging rotating objects.
Significant resolution enhancements are achievable with practical signal-to-noise performance.