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Updated: Jun 5, 2026

Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes

Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes

Published on: May 23, 2017

An adjustable, high sensitivity, wide dynamic range two channel wave-front sensor based on moiré deflectometry.

Saifollah Rasouli¹, M Dashti, Anamparambu N Ramaprakash

¹Department of Physics, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45137-66731, Iran. rasouli@iasbs.ac.ir

|December 18, 2010

Summary

This study presents a new adjustable wave-front sensor using moiré deflectometry to measure atmospheric distortions. The sensor offers high sensitivity and adjustable range for precise wave-front analysis.

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Area of Science:

Optics and Photonics
Atmospheric Science
Optical Metrology

Background:

Atmospheric turbulence distorts light wave-fronts, impacting optical system performance.
Accurate measurement of wave-front distortions is crucial for adaptive optics and remote sensing.
Existing methods may lack adjustability in sensitivity, dynamic range, or spatial resolution.

Purpose of the Study:

To develop and construct an adjustable, high-sensitivity, wide dynamic range two-channel wave-front sensor.
To measure distortions of light wave-fronts transmitted through turbulent atmosphere.
To demonstrate the adjustability of sensor parameters for optimized performance.

Main Methods:

Utilized moiré deflectometry with a two-channel setup.

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A laser beam passed through turbulent atmosphere and was split into two beams.

Moiré fringe deviations were analyzed to calculate angle of arrival components.

Adjusted grating separation and angle to control dynamic range and sensitivity.

Employed bright, dark, and virtual traces for spatial resolution adjustment.

Main Results:

Successfully constructed an adjustable, high-sensitivity, wide dynamic range two-channel wave-front sensor.
Demonstrated the ability to measure two orthogonal components of angle of arrival across the wave-front.
Showcased adjustable dynamic range and sensitivity by altering grating parameters.
Confirmed adjustable spatial resolution without compromising measurement precision.

Conclusions:

The developed moiré deflectometry-based wave-front sensor is effective for measuring atmospheric distortions.
The sensor's adjustable parameters allow for tailored measurements in varying atmospheric conditions.
This technology offers a precise and flexible tool for wave-front analysis in optical and atmospheric studies.