Dr. Viviana Vladutescu Profile

Dr. Viviana Vladutescu

Associate Professor / Optics Lab Coordinator at New York City College of Technology

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Publications (11)

Proceedings Article | 2 August 2019 Presentation

Transmission telescope optical metrology (Conference Presentation)

Viviana Vladutescu, Aaron Swank, Dzu Le, Calvin Robinson, Félix Miranda, Victor Pena, Katherine Chun

Proceedings Volume 11057, 1105718 (2019) https://doi.org/10.1117/12.2534296

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Current and future space-exploration endeavors will require new capabilities for large data transfer between Earth and other planets in the Solar system. Data communication with Earth from other planets will be completed through DSN (Deep Space Network) arrays on Earth and satellites around Earth. In an effort to develop advanced Space communication capabilities for large data transfer, NASA John H. Glenn Research Center at Lewis Field (GRC) is also investing a revolutionary concept, named iROC (integrated Radio and Optical Communication), featuring a space-communication terminal which tightly integrates a compact optical transmitter with a radio communication system. A particular design named TeleTenna (Telescope within (RF) Antenna) for future iROC flight-demonstration is being developed at GRC, in which a laser-transmission telescope is placed at the center of an RF antenna. The TeleTenna system capabilities to be demonstrated should include advanced pointing techniques for laser-transmission without a beacon over vast Space distances up to at least 2.0 AU (Astronomical Unit). The pointing-precision imposed on this TeleTenna design for beaconless optical communication should be achievable with an interferometric Star Tracker (iST) for celestial pointing calculation and the metrology for tracking the outgoing laser-beam. The outer-diameter of the Primary-Mirror (PM) of the telescope (either of Cassegrain or Ritchey-Chrétien type) in the TeleTenna concept for data transmission from Mars to Earth is 0.25 meters, and the Secondary-Mirror (SM) outer-diameter is 0.025 meters. The laser-transmission tertiary optics behind the PM include the laser-fiber port, collimator lens, focus lens, quarter-wave plate, and a beam-splitter in that order; all aligned with the telescope axis. The test-bed that the first author and GRC team setup back in 2017 for some preliminary studies on beaconless-pointing and optics alignment metrology for the TeleTenna concept, and some experimental results will be presented in this paper. The investigated metrology includes an optics alignment sensing metrology to image a beam reflected from a fiducial on the secondary mirror of the surrogate telescope onto a pixelated sensor (PixSen) behind the telescope. Additionally, the metrology includes sampling a portion of the laser beam and redirecting it onto the iST image plane. The objectives of this procedure are to determine angular change of a laser beam as it comes out of the surrogate telescope. Among other findings, the work presented here shows that the alignment measurements performed at the edge of the Fine Steering Mirror (FSM) articulation range lead to nonlinearity in the relationship between the out-going beam direction registered on the iST and the fiducial reflected beam direction on an alignment sensor placed behind the telescope. For this reason, the adjustment of FSM angular position can realign only one of the beams with its respective camera but not both, and therefore an additional metrology instrument is required for high pointing precision. In the presented proof-of-concept metrology, this additional metrology component could be the piezo-controller of the FSM and/or an autocollimator that gives with accuracy the position of the FSM. These findings are relevant to the current development and design of the iROC system at GRC.

Proceedings Article | 24 October 2018 Paper

Lidar application to monitoring emissions and transport of particulate pollution in urban environments with high temporal and spatial resolution

Adrian Diaz Fortich, Victor Dominguez, Yonghua Wu, Mark Arend, Daniella Viviana Vladutescu, Barry Gross, Fred Moshary

Proceedings Volume 10779, 107790C (2018) https://doi.org/10.1117/12.2324848

KEYWORDS: Aerosols, LIDAR, Atmospheric particles, Ozone, Backscatter, Pollution, Spatial resolution, Environmental monitoring

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Proceedings Article | 30 August 2017 Paper

Applications of synergistic combination of remote sensing and in-situ measurements on urban monitoring of air quality

Adrian Diaz, Victor Dominguez, Mark Campmier, Yonghua Wu, Mark Arend, Daniela Viviana Vladutescu, Barry Gross, Fred Moshary

Proceedings Volume 10406, 104060N (2017) https://doi.org/10.1117/12.2281294

KEYWORDS: Aerosols, LIDAR, Atmospheric particles, Remote sensing, Pollution, Atmospheric monitoring, Wind measurement, Meteorology

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Proceedings Article | 29 April 2010 Paper

LIDAR, TEOM, and sunphotometer measured and model reconstructed atmospheric parameters

Daniela Viviana Vladutescu, Barry Gross, Yonghua Wu, Fred Moshary, Samir Ahmed

Proceedings Volume 7684, 76840K (2010) https://doi.org/10.1117/12.850521

KEYWORDS: LIDAR, Atmospheric modeling, Aerosols, Backscatter, Refractive index, Atmospheric particles, Clouds, Climatology, Atmospheric monitoring, Raman spectroscopy

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Proceedings Article | 12 August 2009 Paper

CMAQ validation of optical parameters and PM2.5 based on lidar and sky radiometers: a sensitivity study of optical parameters to hygroscopic aerosols

Daniela Viviana Vladutescu, Erika Garofalo, Barry Gross, Fred Moshary, Samir Ahmed

Proceedings Volume 7460, 74600H (2009) https://doi.org/10.1117/12.826248

KEYWORDS: LIDAR, Aerosols, Atmospheric modeling, Backscatter, Atmospheric particles, Refractive index, Clouds, Atmospheric monitoring, Raman spectroscopy, Water

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Proceedings Article | 8 October 2007 Paper

GPS calibrated multiwavelength water vapor Raman lidar measurements to assess urban aerosol hygroscopicity

Daniela Viviana Vladutescu, Barry Gross, Yonghua Wu, Alex Gilerson, Fred Moshary, Samir Ahmed

Proceedings Volume 6750, 67500R (2007) https://doi.org/10.1117/12.738040

KEYWORDS: Atmospheric modeling, Aerosols, Atmospheric particles, LIDAR, Backscatter, Raman spectroscopy, Water, Humidity, Calibration, Refractive index

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Proceedings Article | 26 September 2007 Paper

Backscatter properties of hygroscopic aerosols using models, combined multiwavelength Raman lidar, GPS, and radiosonds

Daniela-Viviana Vladutescu, Barry Gross, Yonghua Wu, Leona Charles, Fred Moshary, Samir Ahmed

Proceedings Volume 6681, 66810E (2007) https://doi.org/10.1117/12.731141

KEYWORDS: Atmospheric modeling, Aerosols, Atmospheric particles, Backscatter, LIDAR, Raman spectroscopy, Water, Humidity, Calibration, Refractive index

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Proceedings Article | 26 September 2007 Paper

Raman-Mie lidar measurements of low and optically thin cloud

Yonghua Wu, Shuki Chaw, Barry Gross, Viviana Vladutescu, Leona Charles, Nianwen Cao, Fred Moshary, Sam Ahmed

Proceedings Volume 6681, 66810T (2007) https://doi.org/10.1117/12.734126

KEYWORDS: Clouds, LIDAR, Aerosols, Scattering, Raman spectroscopy, Backscatter, Multiple scattering, Atmospheric modeling, Raman scattering, Signal to noise ratio

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Proceedings Article | 26 September 2007 Paper

Atmospheric transport of smoke and dust particulates and their interaction with the Planetary Boundary Layer as observed by multi-wavelength lidar and supporting instrumentation

Leona Charles, Barry Gross, Yonghua Wu, Viviana Vladutescu, Fred Moshary, Sam Ahmed

Proceedings Volume 6681, 66810K (2007) https://doi.org/10.1117/12.731943

KEYWORDS: Aerosols, LIDAR, Backscatter, Atmospheric particles, Atmospheric modeling, Clouds, Radio optics, Atmospheric optics, MODIS, Satellites

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Proceedings Article | 25 September 2007 Paper

Assessment of a QCL laser approach for the simultaneous measurement of ambient ammonia and ozone

Viviana Vladutescu, Barry Gross, Fred Moshary, Samir Ahmed

Proceedings Volume 6760, 676005 (2007) https://doi.org/10.1117/12.734401

KEYWORDS: Ozone, FT-IR spectroscopy, Signal to noise ratio, Quantum cascade lasers, Absorption, Gases, Sensors, Infrared radiation, Carbon monoxide, Mid-IR

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Proceedings Article | 21 October 2005 Paper

Analysis of a dual etalon Fabry Perot cavity for application in a geostationary coastal water imager

Daniela Vladutescu, Fred Moshary, Barry Gross, Samir Ahmed

Proceedings Volume 5978, 597820 (2005) https://doi.org/10.1117/12.629173

KEYWORDS: Fabry–Perot interferometers, Signal to noise ratio, Signal processing, Charge-coupled devices, Imaging systems, Reflectivity, Sensors, Spectrometers, Optical filters, Spectral resolution

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Showing 5 of 11 publications

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