Dr. Martin R. Marcin Profile

Dr. Martin R. Marcin

at Jet Propulsion Lab

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Author

Publications (6)

Proceedings Article | 14 August 2006 Paper

Measurement of the non-common vertex error of a double corner cube

Alireza Azizi, Martin Marcin, Douglas Moore, Steve Moser, John Negron, Eung-Gi Paek, Daniel Ryan, Alex Abramovici, Paul Best, Ian Crossfield, Bijan Nemati, Tim Neville, B. Platt, Leonard Wayne

Proceedings Volume 6292, 629203 (2006) https://doi.org/10.1117/12.696088

KEYWORDS: Metrology, Prisms, Motion measurement, Interferometers, Interferometry, Beam splitters, Autocollimators, Data modeling, Heterodyning, Laser metrology

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Proceedings Article | 30 September 2004 Paper

Continued development of a precision cryogenic dilatometer for the James Webb Space Telescope

Paul Karlmann, Matthew Dudik, Peter Halverson, Marie Levine, Martin Marcin, Robert Peters, Stuart Shaklan, David Van Buren

Proceedings Volume 5528, (2004) https://doi.org/10.1117/12.561342

KEYWORDS: Cryogenics, James Webb Space Telescope, Interferometers, Electronics, Laser sources, Cryocoolers, Temperature metrology, Zerodur, Vibration isolation, Control systems

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Proceedings Article | 24 September 2004 Paper

The DART cylindrical infrared 1-meter membrane reflector

Rhonda Morgan, Greg Agnes, Dan Barber, Jennifer Dooley, Mark Dragovan, Al Hatheway, Marty Marcin

Proceedings Volume 5494, (2004) https://doi.org/10.1117/12.562451

KEYWORDS: Reflectors, Profilometers, Infrared radiation, Space telescopes, Copper, Interferometers, Telescopes, Metrology, Mirrors, Reflector telescopes

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Proceedings Article | 12 December 2003 Paper

Development of a precision cryogenic dilatometer for James Webb Space Telescope materials testing

Matthew Dudik, Peter Halverson, Marie Levine, Martin Marcin, Robert Peters, Stuart Shaklan

Proceedings Volume 5179, (2003) https://doi.org/10.1117/12.506482

KEYWORDS: Cryogenics, James Webb Space Telescope, Temperature metrology, Interferometers, Mirrors, Calibration, Beam splitters, Thermal optics, Error analysis, Laser sources

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Proceedings Article | 26 February 2003 Paper

LISA phase measurement technique

Martin Marcin

Proceedings Volume 4856, (2003) https://doi.org/10.1117/12.461497

KEYWORDS: Receivers, Phase measurement, Nanoimprint lithography, Global Positioning System, Space operations, Sensors, Signal processing, Interferometers, Space telescopes, Telescopes

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Proceedings Article | 11 April 1996 Paper

X-ray beam equalization for digital fluoroscopy

Sabee Molloi, Jerry Tang, Martin Marcin, Yifang Zhou, Behzad Anvar

Proceedings Volume 2708, (1996) https://doi.org/10.1117/12.237780

KEYWORDS: X-rays, X-ray imaging, Chest, Image processing, Radiography, Attenuators, Image quality, Image intensifiers, Signal to noise ratio, Fluoroscopy

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The concept of radiographic equalization has previously been investigated. However, a suitable technique for digital fluoroscopic applications has not been developed. The previously reported scanning equalization techniques cannot be applied to fluoroscopic applications due to their exposure time limitations. On the other hand, area beam equalization techniques are more suited for digital fluoroscopic applications. The purpose of this study is to develop an x- ray beam equalization technique for digital fluoroscopic applications that will produce an equalized radiograph with minimal image artifacts and tube loading. Preliminary unequalized images of a humanoid chest phantom were acquired using a digital fluoroscopic system. Using this preliminary image as a guide, an 8 by 8 array of square pistons were used to generate masks in a mold with CeO². The CeO² attenuator thicknesses were calculated using the gray level information from the unequalized image. The generated mask was positioned close to the focal spot (magnification of 8.0) in order to minimize edge artifacts from the mask. The masks were generated manually in order to investigate the piston and matrix size requirements. The development of an automated version of mask generation and positioning is in progress. The results of manual mask generation and positioning show that it is possible to generate equalized radiographs with minimal perceptible artifacts. The equalization of x-ray transmission across the field exiting from the object significantly improved the image quality by preserving local contrast throughout the image. Furthermore, the reduction in dynamic range significantly reduced the effect of x-ray scatter and veiling glare from high transmission to low transmission areas. Also, the x-ray tube loading due to the mask assembly itself was negligible. In conclusion it is possible to produce area beam compensation that will be compatible with digital fluoroscopy with minimal compensation artifacts. The compensation process produces an image with equalized signal to noise ratio in all parts of the image.

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