Mr. Tmitry J. Zukowski Profile

Tmitry J. Zukowski

Instrument Engineer at Research Support Instruments Inc

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Publications (5)

Proceedings Article | 17 September 2007 Paper

Cryogenic system for interferometric measurement of dimensional changes at 40 K: design and performance

Peter Blake, Franklin Miller, Tim Zukowski, Edgar Canavan, Allen Crane, Tim Madison, David Miller

Proceedings Volume 6692, 669207 (2007) https://doi.org/10.1117/12.741002

KEYWORDS: Interferometers, Mirrors, Distortion, Composites, Cryogenics, Interferometry, Sapphire, Metrology, Thermal modeling, Aerospace engineering

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Proceedings Article | 29 August 2006 Paper

Measurement of zone plate efficiencies in the extreme ultraviolet and applications to radiation monitors for absolute spectral emission

John Seely, Glenn Holland, James Bremer, Tim Zukowski, Michael Feser, Yan Feng, Benjawan Kjornrattanawanich, Leonid Goray

Proceedings Volume 6317, 63170N (2006) https://doi.org/10.1117/12.678142

KEYWORDS: Sensors, Extreme ultraviolet, Zone plates, Diffraction, Visible radiation, Silicon, Gold, Signal detection, Solar radiation, Transmittance

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The diffraction efficiencies of a Fresnel zone plate (ZP), fabricated by Xradia Inc. using the electron-beam writing technique, were measured using polarized, monochromatic synchrotron radiation in the extreme ultraviolet wavelength range 3.4-22 nm. The ZP had 2 mm diameter, 3330 zones, 150 nm outer zone width, and a 1 mm central occulter. The ZP was supported by a 100 nm thick Si₃N₄ membrane. The diffraction patterns were recorded by CMOS imagers with phosphor coatings and with 5.2 μm or 48 μm pixels. The focused +n orders (n=1-4), the diverging -1 order, and the undiffracted 0 order were observed as functions of wavelength and off-axis tilt angle. Sub-pixel focusing of the +n orders was achieved. The measured efficiency in the +1 order was in the 5% to 30% range with the phase-shift enhanced efficiency occurring at 8.3 nm where the gold bars are partially transmitting. The +2 and higher order efficiencies were much lower than the +1 order efficiency. The efficiencies were constant when the zone plate was tilted by angles up to ±1° from the incident radiation beam. This work indicates the feasibility and benefits of using zone plates to measure the absolute EUV spectral emissions from solar and laboratory sources: relatively high EUV efficiency in the focused +1 order, good out-of-band rejection resulting from the low higher-order efficiencies and the ZP focusing properties, insensitivity to (unfocused) visible light scattered by the ZP, flat response with off-axis angle, and insensitivity to the polarization of the radiation based on the ZP circular symmetry. EUV sensors with Fresnel zone plates potentially have many advantages over existing sensors intended to accurately measure absolute EUV emission levels, such as those implemented on the GOES N-P satellites that use transmission gratings which have off-axis sensitivity variations and poor out-of-band EUV and visible light rejection, and other solar and laboratory sensors using reflection gratings which are subject to response variations caused by surface contamination and oxidation.

Proceedings Article | 26 October 2004 Paper

Wide Field Collimator 2 (WFC2) for GOES Imager and Sounder

Shahriar Etemad, James Bremer, Barbara Zukowski, Bert Pasquale, Tmitri Zukowski, Robert Prince, Patrick O'Neill, Robert Ross

Proceedings Volume 5542, (2004) https://doi.org/10.1117/12.559623

KEYWORDS: Imaging systems, Modulation transfer functions, Light emitting diodes, Autocollimators, Collimators, Mirrors, Image processing, Diamond, Convection, Optical fabrication

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Proceedings Article | 3 February 2004 Paper

Optical stimulus for the calibration of the Ultraviolet and Optical Telescope (UVOT) for Swift

Manuel Quijada, Joseph Stock, Ray Boucarut, Timo Saha, Tim Madison, Tim Zukowski

Proceedings Volume 5165, (2004) https://doi.org/10.1117/12.506389

KEYWORDS: Collimators, Mirrors, Diffusers, Ultraviolet radiation, Calibration, Space telescopes, Telescopes, Optical filters, Optical filtering, Point spread functions

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Proceedings Article | 24 September 2002 Paper

Improved wide-field collimator for dynamic testing of the GOES imager and sounder

James Bremer, Shahriar Etemad, Barbara Zukowski, Bert Pasquale, Tmitri Zukowski, Robert Prince, Vincent Holmes, John Ryskewich, Patrick O'Neill, Jeanine Murphy-Morris

Proceedings Volume 4814, (2002) https://doi.org/10.1117/12.451528

KEYWORDS: Light emitting diodes, Imaging systems, Collimators, Control systems, Lens design, Telescopes, Visible radiation, Aerospace engineering, Diffusers, Lamps

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