Ms. Deniz Ölçek Profile

Deniz Ölçek

at University of Oslo

SPIE Involvement:

Author

Publications (5)

Proceedings Article | 26 August 2022 Presentation + Paper

Errors in Deep Dish Development Array (6m) construction and metrology steps

Mohammad Nouroz Islam, Deniz Ölçek, Gordon Lacy, Hsin Cynthia Chiang, Richard Hellyer

Proceedings Volume 12182, 121820F (2022) https://doi.org/10.1117/12.2629423

KEYWORDS: Laser metrology, Composites, Metrology, Reflectors, Error analysis, Telescopes, Antennas, Photogrammetry

Read Abstract +

SPIE Journal Paper | 12 January 2022

Hydrogen Intensity and Real-Time Analysis Experiment: 256-element array status and overview

Devin Crichton, Moumita Aich, Adam Amara, Kevin Bandura, Bruce Bassett, Carlos Bengaly, Pascale Berner, Shruti Bhatporia, Martin Bucher, Tzu-Ching Chang, H. Cynthia Chiang, Jean-François Cliche, Carolyn Crichton, Romeel Dave, Dirk I. De Villiers, Matt Dobbs, Aaron M. Ewall-Wice, Scott Eyono, Christopher Finlay, Sindhu Gaddam, Ken Ganga, Kevin Gayley, Kit Gerodias, Tim Gibbon, Austine Gumba, Neeraj Gupta, Maile Harris, Heiko Heilgendorff, Matt Hilton, Adam D. Hincks, Pascal Hitz, Mona Jalilvand, Roufurd P. M. Julie, Zahra Kader, Joseph Kania, Dionysios Karagiannis, Aris Karastergiou, Kabelo Kesebonye, Piyanat Kittiwisit, Jean-Paul Kneib, Kenda Knowles, Emily Kuhn, Martin Kunz, Roy Maartens, Vincent MacKay, Stuart MacPherson, Christian Monstein, Kavilan Moodley, V. Mugundhan, Warren Naidoo, Arun Naidu, Laura Newburgh, Viraj Nistane, Amanda Di Nitto, Deniz Ölçek, Xinyu Pan, Sourabh Paul, Jeffrey Peterson, Elizabeth Pieters, Carla Pieterse, Aritha Pillay, Anna Polish, Liantsoa Randrianjanahary, Alexandre Refregier, Andre Renard, Edwin Retana-Montenegro, Ian H. Rout, Cyndie Russeeawon, Alireza Vafaei Sadr, Benjamin R. Saliwanchik, Ajith Sampath, Pranav Sanghavi, Mario Santos, Onkabetse Sengate, J. Richard Shaw, Jonathan L. Sievers, Oleg M. Smirnov, Kendrick Smith, Ulrich Armel Mbou Sob, Raghunathan Srianand, Pieter Stronkhorst, Dhaneshwar D. Sunder, Simon Tartakovsky, Russ Taylor, Peter Timbie, Emma Tolley, Junaid Townsend, Will Tyndall, Cornelius Ungerer, Jacques van Dyk, Gary van Vuuren, Keith Vanderlinde, Thierry Viant, Anthony Walters, Jingying Wang, Amanda Weltman, Patrick Woudt, Dallas Wulf, Anatoly Zavyalov, Zheng Zhang

JATIS, Vol. 8, Issue 01, 011019, (January 2022) https://doi.org/10.1117/12.10.1117/1.JATIS.8.1.011019

KEYWORDS: Hydrogen, Telescopes, Baryon acoustic oscillations, Radio astronomy, Receivers, Visibility, Physics, Signal processing, Pulsars, Observatories

Read Abstract +

Proceedings Article | 20 January 2021 Poster + Paper

Noise temperature testing for the Hydrogen Intensity and Real-time Analysis eXperiment (HIRAX)

Emily Kuhn, Benjamin R. Saliwanchik, Maile Harris, Moumita Aich, Kevin Bandura, Tzu-Ching Chang, H. Cynthia Chiang, Devin Crichton, Aaron Ewall-Wice, Austin Gumba, Neeraj Gupta, Kabelo Calvin Kesebonye, Jean-Paul Kneib, Martin Kunz, Kavilan Moodley, Laura Newburgh, Viraj Nistane, Warren Naidoo, Deniz Ölçek, Jeffrey Peterson, Alexandre Refregier, Jonathan Sievers, Corrie Ungerer, Alireza Vafaei Sadr, Jacques van Dyk, Amanda Weltman, Dallas Wulf

Proceedings Volume 11445, 114452Z (2021) https://doi.org/10.1117/12.2560270

KEYWORDS: Calibration, Hydrogen, Baryon acoustic oscillations, Temperature metrology, Optical testing, Antennas

Read Abstract +

Proceedings Article | 11 January 2021 Poster + Paper

Mechanical and optical design of the HIRAX radio telescope

Benjamin R. Saliwanchik, Aaron Ewall-Wice, Devin Crichton, Emily Kuhn, Deniz Ölçek, Kevin Bandura, Martin Bucher, Tzu-Ching Chang, H. Cynthia Chiang, Kit Gerodias, Kabelo Kesebonye, Vincent MacKay, Kavilan Moodley, Laura Newburgh, Viraj Nistane, Jeffrey Peterson, Elizabeth Pieters, Carla Pieterse, Keith Vanderlinde, Jonathan Sievers, Amanda Weltman, Dallas Wulf

Proceedings Volume 11445, 114455O (2021) https://doi.org/10.1117/12.2552508

KEYWORDS: Optical design, Radio telescopes, Baryon acoustic oscillations, Hydrogen, Electromagnetism, Interferometry, Device simulation, Optical simulations

Read Abstract +

Proceedings Article | 13 December 2020 Paper

Metrology of Deep Dish Development array (D3A) for precision alignment and surface deformation analysis

Mohammad Islam, Deniz Ölçek

Proceedings Volume 11445, 114454J (2020) https://doi.org/10.1117/12.2562648

KEYWORDS: Metrology, Optical alignment, Hydrogen, Receivers, Calibration, New and emerging technologies, Interferometers, Prototyping, Composites, Glasses

Read Abstract +

High precision calibration is essential for the new generation of radio interferometers looking for Baryon Acoustic Oscillation signatures in neutral hydrogen emissions which is a signal buried in foregrounds. Yet, differences in instrument design and non-redundancies in the subsystems consisting such instruments can pose great challenges to proper calibration. For instance, Canadian Hydrogen Intensity Mapping Experiment (CHIME) offers a large instantaneous field of view with fast mapping speed with a sensitivity equivalent to a single dish in terms of total collecting area. However, the calibration of its 1000+ individual receivers poses major obstacle to harness the full capability of the new technology. In future instruments, it is planned to use redundancy at the level required for science experiments (typically below 1%). Although, this idea is against the traditional knowledge of having the radio receivers accurate to 1/20th of the observed wavelength, we plan to meet this goal by solving the redundancy issue in the front-end subsystems using precise metrology and alignment methods. To achieve this goal, we work on a 2-element interferometer called Deep Dish Development Array (D3A), with a targeted precision of 1/1000th of a wavelength at 300 MHz, located at Dominion Radio Astrophysical Observatory, located in Penticton, BC, Canada. The D3A will serve as test bed for dish prototyping, composite dish repeatability, antennae back ends which can be scaled to larger arrays without sacrificing the precision. The two dishes are made out of fiber glass composite and measured in the shop condition and in the field after fabrication. The relative pointing accuracy was obtained as 0.02°. The elevation axes of the dishes were placed in East-West direction within 0.04° of error. The surface RMS error was obtained as 0.389 mm which meets the 1/1000th of observation wavelength. RMS error due to temperature variation and assembly error on the dishes were obtained at 1 mm. This article presents the metrology principles applied to obtain the results and challenges. The tests performed in D3A will be implemented in Hydrogen Intensity and Real-time Analysis eXperiment (HIRAX) and the Canadian Hydrogen Observatory and Radio Transient Detector (CHORD).

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years