COMPRESSIVE IMAGING AND DUAL MOIRÉ LASER INTERFEROMETER AS METROLOGY TOOLS

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Abolbashari, M. (2013). COMPRESSIVE IMAGING AND DUAL MOIRÉ LASER INTERFEROMETER AS METROLOGY TOOLS. Unc Charlotte Electronic Theses And Dissertations.
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Abstract

Metrology is the science of measurement and deals with measuring different physical aspects of objects. In this research the focus has been on two basic problems that metrologists encounter. The first problem is the trade-off between the range of measurement and the corresponding resolution; measurement of physical parameters of a large object or scene accompanies by losing detailed information about small regions of the object. Indeed, instruments and techniques that perform coarse measurements are different from those that make fine measurements. This problem persists in the field of surface metrology, which deals with accurate measurement and detailed analysis of surfaces. For example, laser interferometry is used for fine measurement (in nanometer scale) while to measure the form of in object, which lies in the field of coarse measurement, a different technique like moiré technique is used. We introduced a new technique to combine measurement from instruments with better resolution and smaller measurement range with those with coarser resolution and larger measurement range. We first measure the form of the object with coarse measurement techniques and then make some fine measurement for features in regions of interest. The second problem is the measurement conditions that lead to difficulties in measurement. These conditions include low light condition, large range of intensity variation, hyperspectral measurement, etc. Under low light condition there is not enough light for detector to detect light from object, which results in poor measurements. Large range of intensity variation results in a measurement with some saturated regions on the camera as well as some dark regions. We use compressive sampling based imaging systems to address these problems. Single pixel compressive imaging uses a single detector instead of array of detectors and reconstructs a complete image after several measurements. In this research we examined compressive imaging for different applications including low light imaging, high dynamic range imaging and hyperspectral imaging.

Details
Author

Abolbashari, Mehrdad

Title

COMPRESSIVE IMAGING AND DUAL MOIRÉ LASER INTERFEROMETER AS METROLOGY TOOLS

Physical Description

1 online resource (194 pages) : PDF

Date

2013

Degree Granting Institution

University of North Carolina at Charlotte

Abstract

Metrology is the science of measurement and deals with measuring different physical aspects of objects. In this research the focus has been on two basic problems that metrologists encounter. The first problem is the trade-off between the range of measurement and the corresponding resolution; measurement of physical parameters of a large object or scene accompanies by losing detailed information about small regions of the object. Indeed, instruments and techniques that perform coarse measurements are different from those that make fine measurements. This problem persists in the field of surface metrology, which deals with accurate measurement and detailed analysis of surfaces. For example, laser interferometry is used for fine measurement (in nanometer scale) while to measure the form of in object, which lies in the field of coarse measurement, a different technique like moiré technique is used. We introduced a new technique to combine measurement from instruments with better resolution and smaller measurement range with those with coarser resolution and larger measurement range. We first measure the form of the object with coarse measurement techniques and then make some fine measurement for features in regions of interest. The second problem is the measurement conditions that lead to difficulties in measurement. These conditions include low light condition, large range of intensity variation, hyperspectral measurement, etc. Under low light condition there is not enough light for detector to detect light from object, which results in poor measurements. Large range of intensity variation results in a measurement with some saturated regions on the camera as well as some dark regions. We use compressive sampling based imaging systems to address these problems. Single pixel compressive imaging uses a single detector instead of array of detectors and reconstructs a complete image after several measurements. In this research we examined compressive imaging for different applications including low light imaging, high dynamic range imaging and hyperspectral imaging.

Genre

doctoral dissertations

Subjects--Topics

Optics
Engineering

Degree

Ph.D.

Keywords

Compressive Imaging
Image Processing
Laser Interferometry
Moire Technique
Multi Scale Measurement
Precision Metrology

Subject Area

Optical Science and Engineering

Advisor(s)

Farahi, Faramarz

Committee Members

Davies, Angela
Fiddy, Michael
Gerges, Awad
Hocken, Robert
Bird, Jonathan

Degree Note

Thesis (Ph.D.)--University of North Carolina at Charlotte, 2013.

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Rights Holder Information

Copyright is held by the author unless otherwise indicated.

Identifier

Abolbashari_uncc_0694D_10514

Permalink

http://hdl.handle.net/20.500.13093/etd:1553