Mr. Aafaque R. Khan Profile

Aafaque R. Khan

Websites:

Personal Website | Company Website

Publications (11)

Proceedings Article | 5 October 2023 Presentation

Tolerance and alignment study of two-channel telescope spectroscopy for Aspera

Heejoo Choi, Haeun Chung, Carlos Vargas, Aafaque Khan, Jason Corliss, Daewook Kim

Proceedings Volume PC12677, PC126770D (2023) https://doi.org/10.1117/12.2678100

KEYWORDS: Telescopes, Spectroscopy, Optical alignment, Computer generated holography, Microchannel plates, Extreme ultraviolet, Tolerancing, Optical gratings, Galactic astronomy, Satellites

Read Abstract +

Proceedings Article | 27 September 2023 Presentation

FIREBall-2 UV balloon telescope in-flight calibration system

Jessica Li, Nazende Kerkeser, Aafaque Khan, Simran Agarwal, Erika Hamden, David Schiminovich, Haeun Chung, Vincent Picouet, Drew Miles, Keri Hoadley, Ignacio Cevallos-Aleman, Harrison Bradley, Olivia Jones, D. Christopher Martin, Marty Crabill, Trenton Brendel, Shouleh Nikzad, Nicolas Bray, Johan Montel, Gillian Kyne, Zeren Lin, Philippe Balard, Patrick Blanchard, Charles-Antoine Chevrier, Alain Peus, Didier Vibert, Nicole Melso, David Valls-Gabaud

Proceedings Volume 12678, 1267804 (2023) https://doi.org/10.1117/12.2676583

KEYWORDS: Calibration, Ultraviolet telescopes, Ultraviolet radiation, Telescopes, Balloons, Zinc, Spectrographs, Emission wavelengths, Camera shutters, Sensors

Read Abstract +

Proceedings Article | 27 September 2023 Presentation

Advanced detector coatings for UV spectroscopy applications

April Jewell, John Hennessy, Robin Rodríguez, Erika Hamden, Aafaque Khan

Proceedings Volume 12678, 126780L (2023) https://doi.org/10.1117/12.2678037

KEYWORDS: Ultraviolet radiation, Spectroscopy, Optical coatings, Ultraviolet detectors, Spectrometers, Spectral response, Quantum efficiency, Galaxy evolution, Dispersion, Antireflective coatings

Read Abstract +

Proceedings Article | 27 September 2023 Presentation

Payload design and development of Aspera: the UV SmallSat mission for mapping warm-hot phase gas in nearby galaxy halos

Haeun Chung, Carlos Vargas, Erika Hamden, Thomas McMahon, Hannah Tanquary, Peter Behroozi, Ewan Douglas, Miriam Keppler, Nicole Melso, Simran Agarwal, Aafaque Khan, Jessica Li, Sumedha Uppnor, Jacob Chambers, Giulia Ghidoli, Gabe Noriega, Ryan Pecha, Ellie Wolcott, Fernando Coronado, Elijah Garcia, Daniel Truong, Naomi Yescas, Heejoo Choi, Tom Connors, Jason Corliss, Dave Hamara, Walter Harris, Karl Harshman, Daewook Kim, Corwynn Sauve, Bill Verts, Michael Ward, Dennis Zaritsky, Carl Hergenrother, John Kidd, Sanford Selznick, Oswald Siegmund, Simon Grocott, David Schiminovich, Keri Hoadley

Proceedings Volume 12678, 126780C (2023) https://doi.org/10.1117/12.2677212

KEYWORDS: Galactic astronomy, Design and modelling, Ultraviolet radiation, Spectrographs, Optical alignment, Computer generated holography, Ultraviolet telescopes, Ultraviolet detectors, UV-Vis spectroscopy, Tolerancing

Read Abstract +

SPIE Journal Paper | 25 November 2022 Open Access

Balloon-borne FIREBall-2 ultraviolet spectrograph stray light control based on nonsequential reverse modeling of on-sky data

Trenton Brendel, Aafaque Khan, Simran Agarwal, Heejoo Choi, Daewook Kim, Erika Hamden, Vincent Picouet, D. Christopher Martin, Bruno Milliard, David Schiminovich, Shouleh Nikzad, Jean Evrard, Nicolas Bray, Johan Montel, Keri Hoadley, Drew Miles, Gillian Kyne, Jessica Li, Zeren Lin, Haeun Chung, Philippe Balard, Patrick Blanchard, Marty Crabill, Charles-Antoine Chevrier, Alain Peus, Ignacio Cevallos-Aleman, Olivia Jones, Harrison Bradley, Naz Ipek Kerkeser, Matthew Werneken, Didier Vibert, Nicole Melso, David Valls-Gabaud

JATIS, Vol. 8, Issue 04, 048001, (November 2022) https://doi.org/10.1117/12.10.1117/1.JATIS.8.4.048001

KEYWORDS: Baffles, Stray light, Sensors, Spectrographs, Mirrors, Balloons, Ultraviolet radiation, Stray light control, Tongue, Light scattering

Read Abstract +

DOWNLOAD PAPER

Proceedings Article | 31 August 2022 Poster + Paper

The thermal filter for the Solar Ultraviolet Imaging Telescope (SUIT) on-board Aditya-L1

Avyarthana Ghosh, Ravi Kesharwani, Aafaque Khan, Sreejith Padinhatteeri, Durgesh Tripathi, A. Ramaprakash, Ketan Patel, Tayaramma D. P. V. Jalluri, G. R. Madhumalathi, R. Venkateshwaran, S. Elumalai, Kinshuk Gupta, J. P. Nair, H. Sparrow, R. S. Worlikar, Anit Gupta, Sanjoy Sen

Proceedings Volume 12181, 121813O (2022) https://doi.org/10.1117/12.2629760

KEYWORDS: Optical filters, Telescopes, Coating, Charge-coupled devices, Ultraviolet telescopes, Reflection, Ultraviolet radiation, Sun, Visible radiation, Space telescopes, Bandpass filters, Gamma radiation

Read Abstract +

The solar ultraviolet imaging telescope (SUIT) is an imaging telescope on-board the Aditya-L1 satellite, which is India’s maiden space mission dedicated solely to solar observations. The spatially resolved, high cadence observations are designed to be taken in eleven science filters with full width half maxima ranging between 0.1–58 nm and spread over the near-ultraviolet (NUV) domain of the solar spectrum (200–400 nm). The huge incoming solar flux, limited by the linearity regime performance of the charge coupled device (CCD) as well as the thermal operational constraints, mandate the use of an entrance aperture filter, the thermal filter (TF), for SUIT. The design of this filter is, further, constrained by exposure time and enhanced emission of the sun during eruptive events. From performance perspective, the TF reflects ∼50% of the incident radiation and allows only 0.1–0.45% of the incoming flux to pass within 200–400 nm. The transmission on either side of the operational range is satisfactorily reduced, so as to ensure minimum unwanted light leaking into the imaging system. Therefore, the TF plays a significant role in increasing the photometric efficiency as well as maintaining the operational temperature of the telescope. To the best of our knowledge, this is the first time any attempt of designing and manufacturing any such rejection filter aiming optimized performance in the NUV range is being done for a space-based imaging solar telescope. The choice of materials for substrate and coating for the filter poses several challenges in terms of contamination, corrosion/ oxidation, durability during manufacturing process, long-term exposure to harsh space environment as well as formation of pinholes. The transmission and reflection profiles of the fabricated TF is satisfactory to meet our design and technical constraints. The TF is also qualified for various environmental and radiation conditions. The transmission of the TF is seen to be well within our allowed margins (±10% of the design value) even after being exposed to these qualification tests.

Proceedings Article | 29 August 2022 Presentation

FIREBall-2(022): challenges, progress, and the road ahead to flight

Keri Hoadley, Chris Martin, Erika Hamden, David Schiminovich, Shouleh Nikzad, Jean Evrard, Bruno Milliard, David Valls-Gabaud, Aafaque Khan, Simran Agarwal, Haeun Chung, Jessica Li, Trenton Brendel, Carlos Vargas, Nicole Melso, Zeren Lin, Marty Crabill, Drew Miles, Gillian Kyne, Vincent Picouet, Ignacio Cevallos, Barbara Santiago, Philippe Balard, Patrick Blanchard, Didier Vibert, Nicolas Bray, Catherine Hourtolle, Frédéri Mirc, Johan Montel, Jared Termini

Proceedings Volume 12181, 1218109 (2022) https://doi.org/10.1117/12.2629052

KEYWORDS: Roads, Galactic astronomy, Ultraviolet radiation, Space operations, Electron multiplying charge coupled devices, Ultraviolet telescopes, Ultraviolet detectors, Spectrographs, Space telescopes, Observatories

Read Abstract +

Proceedings Article | 29 August 2022 Poster + Paper

Balloon-borne FIREBall-2 UV spectrograph stray light control based on non-sequential reverse modeling of on-sky data

Trenton Brendel, Aafaque Khan, Simran Agarwal, Heejoo Choi, Daewook Kim, Erika Hamden

Proceedings Volume 12182, 121823L (2022) https://doi.org/10.1117/12.2631704

KEYWORDS: Stray light, Sensors, Mirrors, Spectrographs, Light scattering, Ultraviolet radiation, Scattering

Read Abstract +

Proceedings Article | 20 August 2021 Presentation + Paper

Aspera: the UV SmallSat telescope to detect and map the warm-hot gas phase in nearby galaxy halos

Haeun Chung, Carlos Vargas, Erika Hamden, Tom McMahon, Kerry Gonzales, Aafaque Khan, Simran Agarwal, Hop Bailey, Peter Behroozi, Trenton Brendel, Heejoo Choi, Tom Connors, Lauren Corlies, Jason Corliss, Ralf-Jürgen Dettmar, David Dolana, Ewan Douglas, John Guzman, Dave Hamara, Walt Harris, Karl Harshman, Carl Hergenrother, Keri Hoadley, John Kidd, Daewook Kim, Jessica Li, Manny Montoya, Corwynn Sauve, David Schiminovich, Sanford Selznick, Oswald Siegmund, Michael Ward, Ellie Wolcott, Dennis Zaritsky

Proceedings Volume 11819, 1181903 (2021) https://doi.org/10.1117/12.2593001

KEYWORDS: Galactic astronomy, Spectrographs, Microchannel plates, Telescopes, Spectral resolution, Ultraviolet radiation, Target detection, Signal detection, Mirrors

Read Abstract +

Proceedings Article | 9 September 2019 Presentation + Paper

The FIREBall-2 UV balloon telescope: 2018 flight and improvements for 2020

Keri Hoadley, Erika Hamden, Bruno Milliard, Aafaque Khan, Simran Agarwal, Zeren Lin, David Schiminovich, Gillian Kyne, Jean Evrard, D. Christopher Martin

Proceedings Volume 11118, 1111815 (2019) https://doi.org/10.1117/12.2530047

KEYWORDS: Spectrographs, Galactic astronomy, Sensors, Ultraviolet radiation, Light scattering, Optical coatings, Calibration, Electron multiplying charge coupled devices

Read Abstract +

Proceedings Article | 18 July 2016 Paper

The Solar Ultraviolet Imaging Telescope onboard Aditya-L1

Avyarthana Ghosh, Subhamoy Chatterjee, Aafaque Khan, Durgesh Tripathi, A. Ramaprakash, Dipankar Banerjee, Pravin Chordia, Achim Gandorfer, Natalie Krivova, Dibyendu Nandy, Chaitanya Rajarshi, Sami Solanki, S. Sriram

Proceedings Volume 9905, 990503 (2016) https://doi.org/10.1117/12.2232266

KEYWORDS: Space operations, Ultraviolet radiation, Space telescopes, Telescopes, Space telescopes, Solar processes, Sensors, X-ray imaging, Plasma, Ions, Magnetosphere

Read Abstract +

Showing 5 of 11 publications

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