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

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

Published on: July 5, 2016

Holographic aperture ladar.

Bradley D Duncan¹, Matthew P Dierking

¹University of Dayton Electro-Optics Program, Ohio, USA. brad@udayton.edu

|April 10, 2013

Summary

This summary is machine-generated.

Holographic aperture ladar (HAL) enhances resolution by synthesizing a large aperture using a sensor array and advanced signal processing. This technique achieves significant resolution gains in airborne applications, even with moving transmitters and receivers.

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Area of Science:

* Optical Engineering
* Remote Sensing
* Signal Processing

Background:

* Synthetic aperture ladar (SAL) traditionally uses a single moving point detector to synthesize a larger aperture.
* Conventional SAL has limitations in achieving high cross-range resolution, especially in complex scenarios.

Purpose of the Study:

* To develop holographic aperture ladar (HAL) transformations for enhanced cross-range resolution.
* To investigate stripmap and spotlight HAL transformations for synthesizing larger effective apertures.
* To address challenges of moving transmitters and receivers in airborne applications.

Main Methods:

* Utilizing a two-dimensional translating sensor array instead of a point detector.
* Developing stripmap and spotlight holographic aperture transformations.
* Coherently stitching sequentially collected pupil plane field segments.
* Implementing proper phasing and correlation of detected signals in postprocessing.

Main Results:

* Achieved resolution enhancements exceeding two times (stripmap) and three times (spotlight) the ratio of synthetic to real aperture diameter.
* Demonstrated HAL's robustness to scene depth variations with accurate range estimation.
* Successfully formed images in two orthogonal cross-range dimensions.

Conclusions:

* Holographic aperture ladar offers a significant advancement over conventional SAL for high-resolution imaging.
* The developed transformations enable the synthesis of complex, large-extent pupil plane fields.
* HAL is a practical and effective technique for airborne remote sensing applications.