Dr. Sriram Sripadmanaban Profile

Dr. Sriram Sripadmanaban

at Indian Institute of Astrophysics

SPIE Involvement:

Author

Publications (22)

Proceedings Article | 18 July 2024 Poster + Paper

Theoretical analysis of fiber arrangements for improved coupling efficiency in the VBT high-resolution echelle spectrograph

Nitish Singh, S. Sriram, Bharat Kumar Yerra, Prasanna Deshmukh

Proceedings Volume 13096, 130968I (2024) https://doi.org/10.1117/12.3012480

KEYWORDS: Fiber couplers, Spectrographs, Simulations, Telescopes, Spectral resolution, Sensors, Point spread functions, Cladding, Reflectivity, Mirrors

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Proceedings Article | 18 July 2024 Poster + Paper

A multi-functional fiber positioning system for extremely large telescopes

Manjunath Bestha, T. Sivarani, Arun Surya, Sudharsan Yadav, Athira Unni, Parvathy M., Devika Divakar, S. Sriram, Ajin Prakash, Amirul Hasan

Proceedings Volume 13096, 1309661 (2024) https://doi.org/10.1117/12.3019098

KEYWORDS: Design, Spectroscopy, Telescopes, Mirrors, Large telescopes, Spectrographs, Astronomical imaging, Dichroic mirrors, Dispersion, Optical fibers

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Proceedings Article | 4 October 2023 Poster + Paper

Atmospheric dispersion corrector for a multi-object spectroscopic mode of HROS-TMT

Manjunath Bestha, Amirul Hasan, Devika Divakar, Arun Surya, S. Sriram, T. Sivarani, Ajin Prakash, Parvathy M., Sudharshan Yadav

Proceedings Volume 12677, 126770Q (2023) https://doi.org/10.1117/12.2677192

KEYWORDS: Multiplexing, Mechanical positioning systems, Dispersion, Telescopes, Mirrors, Thirty Meter Telescope, Spectroscopy, Prisms, Design and modelling, Tolerancing, Spectroscopic atmospheric monitoring techniques

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Proceedings Article | 13 December 2020 Paper

Design, development, and analysis of segment support system for TMT primary mirror

Alikhan Basheer, S. Sriram, Vineeth Valsan, K. Sudharsan, Viswanatha Narasimhiah, T. Krishna Murthy, Mahesh P. K., G. Anupama

Proceedings Volume 11451, 114510I (2020) https://doi.org/10.1117/12.2564850

KEYWORDS: Glasses, Thirty Meter Telescope, Mirrors, Polishing, Spherical lenses, Surface finishing, Aspheric lenses, Metrology, Tolerancing

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Proceedings Article | 13 December 2020 Poster + Presentation + Paper

Polishing and testing of TMT reference sphere

Dijana Bogunovic, Graeme Jonas, Dave Cochrane, Sripadmanaban Sriram, G. Anupama

Proceedings Volume 11451, 1145130 (2020) https://doi.org/10.1117/12.2561910

KEYWORDS: Thirty Meter Telescope, Optical spheres, Polishing, Adaptive optics, Imaging systems, Imaging spectroscopy, Mirrors, Optics manufacturing, Telescopes, Off axis mirrors

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Proceedings Article | 13 December 2020 Poster + Paper

Using a passively stabilized Fabry-Perot etalon for determining instrumental artifacts in a spectrograph

Tanya Das, Ravinder Banyal, T. Sivarani, S. Sriram

Proceedings Volume 11447, 1144748 (2020) https://doi.org/10.1117/12.2562007

KEYWORDS: Fabry–Perot interferometers, Spectrographs, Calibration, Doppler effect, Spectroscopes, Velocity measurements, Distortion, Stars, Instrument modeling, Telescopes

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Proceedings Article | 13 December 2020 Poster + Presentation + Paper

Qualitative and quantitative test of digital micromirror device for next generation UV multi-object spectroscopy

Unni C. Vishnu, S. Sriram, Vineeth Valsan, Annapurni Subramaniam

Proceedings Volume 11444, 114447A (2020) https://doi.org/10.1117/12.2576340

KEYWORDS: Spectroscopes, Digital micromirror devices, Ultraviolet radiation, Astronomical imaging, Stars, Molybdenum, Diffraction, Scattering, Reflectivity, Numerical simulations

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Proceedings Article | 3 January 2020 Paper

Spectroscopic Investigation of Nebular Gas (SING): a dedicated NUV spectrograph to study extended objects

Bharat Chandra, B. Nair, Ambily Suresh, C. Shanti Prabha, Joice Mathew, Nirmal K., Mayuresh Sarpotdar, Rekhesh Mohan, Margarita Safonova, Sripadmanaban Sriram, Jayant Murthy

Proceedings Volume 11203, 112031K (2020) https://doi.org/10.1117/12.2539889

KEYWORDS: Spectrographs, Microchannel plates, Space operations, Telescopes, Ultraviolet radiation

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Proceedings Article | 11 July 2018 Paper

Estimation of polarization aberrations and its effect on the point spread function of the Thirty Meter Telescope

Ramya Anche, G. C. Anupama, S. Sriram, K. Sankarasubramanian, Warren Skidmore

Proceedings Volume 10703, 107034K (2018) https://doi.org/10.1117/12.2312506

KEYWORDS: Mirrors, Polarization, Point spread functions, Telescopes, Coating, Thirty Meter Telescope, Adaptive optics, Monochromatic aberrations, Zemax, Reflection

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Proceedings Article | 10 July 2018 Paper

Flexure compensation simulation tool for TMT-WFOS Spectrograph

Arun Surya, Matthew Radovan, Sivarani Thirupathi, S. Sriram, Devika Divakar, Jason Fucik

Proceedings Volume 10705, 107051G (2018) https://doi.org/10.1117/12.2312155

KEYWORDS: Optical components, Zemax, Spectrographs, Monte Carlo methods, Device simulation, Optical design, Spectroscopy

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Proceedings Article | 9 July 2018 Presentation

The wide field optical spectrograph (WFOS) for TMT: fiber-WFOS optical design (Conference Presentation)

Renate Kupke, Hangxin Ji, Sriram Padmanaban Nadar, Devika Divakar, Luc Gilles

Proceedings Volume 10702, 1070221 (2018) https://doi.org/10.1117/12.2313674

KEYWORDS: Spectrographs, Optical design, Spectral resolution, Channel projecting optics, Astronomical imaging, Optical fibers, Collimators, Cameras, Multiplexing, Adaptive optics

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Proceedings Article | 9 July 2018 Paper

Estimation of asymmetries in point spread function for the echelle spectrograph operating at Vainu Bappu Telescope for high precision radial velocity studies

Sireesha Chamarthi, Ravinder Banyal, S. Sriram

Proceedings Volume 10702, 1070275 (2018) https://doi.org/10.1117/12.2312508

KEYWORDS: Spectrographs, Point spread functions, Zemax, Iodine, Stars, Calibration, Telescopes, Doppler effect, Absorption

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Proceedings Article | 9 July 2018 Presentation

WFOS instrument trade study: slicer vs. fiber instrument concept designs and results (Conference Presentation)

Kevin Bundy, Maureen Savage, Renate Kupke, Nicholas MacDonald, Kyle Westfall, Matthew Radovan, Zheng Cai, Brian Digiorgio, Richard Dekany, Devika Divakar, Jason Fucik, Hangxin Ji, Satoshi Miyazaki, Shinobu Ozaki, Andrew Phillips, Namrata Roy, Roger Smith, Arun Surya, S. Sriram, Sivarani Thirupathi, Toshihiro Tsuzuki

Proceedings Volume 10702, 1070220 (2018) https://doi.org/10.1117/12.2312283

KEYWORDS: Spectrographs, Thirty Meter Telescope, Multiplexing, Robotic systems, Spectroscopy, Astronomical imaging, Robotics, Fiber couplers, Telescopes

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Proceedings Article | 6 July 2018 Presentation + Paper

Opto-mechanical assembly and ground calibration of LUCI

Joice Mathew, B. Nair, S. Sriram, P. U. Kamath, Ajin Prakash, Mayuresh Sarpotdar, S. Ambily, Nirmal K., A. G. Sreejith, Margarita Safonova, Jayant Murthy, Noah Brosch

Proceedings Volume 10699, 106992V (2018) https://doi.org/10.1117/12.2312733

KEYWORDS: Ultraviolet radiation, Space telescopes, Telescopes, Mirrors, Calibration, Collimators, Ultraviolet telescopes, Charge-coupled devices, Aerospace engineering, Sensors

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Proceedings Article | 6 July 2018 Paper

Hanle echelle spectrograph: design and performance

S. Sriram, Amit Kumar, Arun Surya, T. Sivarani, Sunetra Giridhar, S. Kathiravan, M. N. Anand, Damien Jones, Deon Grobler, Robert Jakobsson, Anantha Chanumolu, Athira Unni, Angchuk Dorje, Tsewang Dorje, Tsewang Gyalson

Proceedings Volume 10702, 107026K (2018) https://doi.org/10.1117/12.2313165

KEYWORDS: Spectrographs, Calibration, Mirrors, Telescopes, Charge-coupled devices, Sensors

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SPIE Journal Paper | 17 May 2018

Design and modeling of a tunable spatial heterodyne spectrometer for emission line studies

Nirmal Kaipachery, Sridharan Rengaswamy, Sripadmanaban Nadar Sriram, Jayant Murthy, Ambily Suresh, Margarita Safonova, Aickara Gopinathan Sreejith, Joice Mathew, Mayuresh Sarpotdar

JATIS, Vol. 4, Issue 02, 025001, (May 2018) https://doi.org/10.1117/12.10.1117/1.JATIS.4.2.025001

KEYWORDS: Sensors, Spectroscopy, Heterodyning, Spectral resolution, Fourier transforms, Lamps, Systems modeling, Beam splitters, Mirrors, Stars

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Proceedings Article | 18 July 2016 Paper

In-orbit performance of UVIT on ASTROSAT

Annapurni Subramaniam, Shyam Tandon, John Hutchings, Swarna Ghosh, Koshy George, V. Girish, P. U. Kamath, S. Kathiravan, Amit Kumar, J. Paul Lancelot, P. K. Mahesh, Rekhesh Mohan, Jayant Murthy, S. Nagabhushana, Ashok Pati, Joe Postma, N. Kameswara Rao, Kasiviswanathan Sankarasubramanian, P. Sreekumar, S. Sriram, Chelliah Stalin, Firoza Sutaria, Yuvraj Harsha Sreedhar, Indrajit Barve, Chayan Mondal, Snehalate Sahu

Proceedings Volume 9905, 99051F (2016) https://doi.org/10.1117/12.2235271

KEYWORDS: Sensors, Calibration, Hard x-rays, Particles, Imaging spectroscopy, Photovoltaics, Imaging systems, Algorithm development, Satellites, Polarimetry

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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

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Proceedings Article | 15 June 2015 Paper

Modeling the segmented primary for a 10-meter-class telescope

Vineeth Valsan, S. Sriram, Annu Jacob, J. Lancelot, G. Anupama

Proceedings Volume 9654, 96540C (2015) https://doi.org/10.1117/12.2181743

KEYWORDS: Mirrors, Image segmentation, Telescopes, Point spread functions, Wavefronts, Space telescopes, Zemax, Aspheric lenses, Diffraction, Segmented mirrors

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Proceedings Article | 29 July 2014 Paper

ASTROSAT mission

Kulinder Pal Singh, S. N. Tandon, P. C. Agrawal, H. M. Antia, R. K. Manchanda, J. S. Yadav, S. Seetha, M. C. Ramadevi, A. R. Rao, D. Bhattacharya, B. Paul, P. Sreekumar, S. Bhattacharyya, G. C. Stewart, J. Hutchings, S. A Annapurni, S. K. Ghosh, J. Murthy, A. Pati, N. K. Rao, C .S. Stalin, V. Girish, K. Sankarasubramanian, S. Vadawale, V. B. Bhalerao, G. C. Dewangan, D. K. Dedhia, M. K. Hingar, T. B. Katoch, A. T. Kothare, I. Mirza, K. Mukerjee, H. Shah, P. Shah, R. Mohan, A. K. Sangal, S. Nagabhusana, S. Sriram, J. P. Malkar, S. Sreekumar, A. F. Abbey, G. M. Hansford, A. Beardmore, M. R. Sharma, S. Murthy, R. Kulkarni, G. Meena, V. C. Babu, J. Postma

Proceedings Volume 9144, 91441S (2014) https://doi.org/10.1117/12.2062667

KEYWORDS: X-rays, Sensors, Satellites, Mirrors, X-ray telescopes, Ultraviolet radiation, Space telescopes, Stars, Charge-coupled devices, Imaging systems

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Proceedings Article | 17 September 2012 Paper

Tests and calibration on ultra violet imaging telescope (UVIT)

Amit Kumar, S. Ghosh, P. Kamath, Joe Postma, S. Kathiravan, P. Mahesh, S. Nagbhushana, K. Navalgund, N. Rajkumar, M. Rao, K. Sarma, S. Sriram, C. Stalin, S. Tandon

Proceedings Volume 8443, 84434R (2012) https://doi.org/10.1117/12.924147

KEYWORDS: Telescopes, Space telescopes, Sensors, Mirrors, Calibration, Optical filters, Ultraviolet radiation, Optical testing, Optical alignment, Astrophysics

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Proceedings Article | 17 September 2012 Paper

Ultraviolet imaging telescope (UVIT) on ASTROSAT

Amit Kumar, S. Ghosh, J. Hutchings, P. Kamath, S. Kathiravan, P. Mahesh, J. Murthy, S. Nagbhushana, A. Pati, M. Rao, N. Rao, S. Sriram, S. Tandon

Proceedings Volume 8443, 84431N (2012) https://doi.org/10.1117/12.924507

KEYWORDS: Telescopes, Space telescopes, Mirrors, Sensors, Optical filters, Ultraviolet radiation, Contamination, Satellites, Photons, Aluminum

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Showing 5 of 22 publications

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