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$Interference and Diffraction$ 02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.

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Related Experiment Video

Updated: Jun 8, 2026

A Multimodal Wide-Field Fourier-Transform Raman Microscope

A Multimodal Wide-Field Fourier-Transform Raman Microscope

Published on: December 30, 2025

Computationally efficient signal modeling for vertical scanning interferometry.

Wee Keat Chong¹, Xiang Li, Sardha Wijesoma

¹Precision Measurement Group, Singapore Institute of Manufacturing Technology, 71 Nanyang Drive, Singapore 638075, Singapore. wkchong@simtech.a-star.edu.sg

|September 11, 2010

Summary

This study introduces a faster model for vertical scanning interferometry (VSI) signals. The new method significantly reduces computation time while maintaining accuracy, aiding future VSI research.

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Area of Science:

Optics and Photonics
Metrology

Background:

Vertical scanning interferometry (VSI) is crucial for high-precision measurements.
Existing VSI simulation models suffer from oversimplification or high computational cost.

Purpose of the Study:

To develop a computationally efficient model for simulating VSI interference signals.
To address limitations of current VSI modeling techniques.

Main Methods:

A novel model for VSI signal simulation is presented.
The model incorporates geometric and spectral effects.
It replaces intensive numerical integration with a piecewise cosine function approximation of the light spectrum.

Main Results:

The proposed model achieves a 256,800-fold reduction in computational time compared to direct numerical integration.
Simulations for a phosphor-based LED interference signal show high accuracy.
Results are validated against experimental data and a computationally intensive model.

Conclusions:

The developed model offers a significant speed-up for VSI signal simulation.
Its accuracy is confirmed through experimental and comparative analysis.
The simplified mathematical form of the interference signal will benefit future research in VSI.