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Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

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Spatial Multiplexing Technique for Improving Dynamic Range of Speckle Correlation based Optical Lever.

Vijayakumar Anand^1,2, Shanti Bhattacharya³, Joseph Rosen⁴

¹Department of Electrical Engineering, Indian Institute of Technology Madras, Chennai, 600036, India. vanand@swin.edu.au.

Scientific Reports

|November 7, 2019

Summary

Spatial multiplexing enhances speckle correlation optical levers (SC-OptLev) for improved angular sensing. This technique expands the dynamic range of SC-OptLev beyond sensor limitations.

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Area of Science:

Optics
Metrology
Surface characterization

Background:

Speckle correlation based optical levers (SC-OptLev) are effective for sensing minute angular changes.
Existing SC-OptLev systems have limitations in their dynamic range due to sensor size.

Purpose of the Study:

To introduce and validate a spatial multiplexing technique for enhancing the dynamic range of SC-OptLev.
To enable SC-OptLev systems to measure angular orientations beyond the physical constraints of the image sensor.

Main Methods:

A synthetic speckle pattern, larger than the image sensor, is created by stitching multiple recorded sections.
This synthetic pattern is used for calibration and real-time monitoring of surface angular changes.
Cross-correlation analysis of recorded and synthetic speckle patterns determines angular orientation.

Main Results:

The spatial multiplexing technique successfully increases the dynamic range of SC-OptLev.
Angular orientation changes are accurately sensed beyond the limits imposed by the image sensor size.
Demonstrated feasibility of the proposed method for advanced angular sensing applications.

Conclusions:

Spatial multiplexing is a viable strategy to overcome dynamic range limitations in SC-OptLev.
The developed technique offers a significant improvement for high-precision angular measurement systems.
This advancement has implications for various fields requiring sensitive surface orientation detection.