Dr. Anantha Chanumolu Profile

Dr. Anantha Chanumolu

Instrument Scientist at European Space Agency

SPIE Involvement:

Author

Publications (7)

Proceedings Article | 19 October 2023 Presentation + Paper

Status on the development of the Copernicus CO2M mission: monitoring anthropogenic carbon dioxide from space

Y. Durand, G. Bazalgette Courrèges-Lacoste, C. Pachot, A. Pasquet, A. Chanumolu, Y. Meijer, V. Fernandez

Proceedings Volume 12729, 127290V (2023) https://doi.org/10.1117/12.2684820

KEYWORDS: Equipment, Spectroscopy, Satellites, Short wave infrared radiation, Imaging systems, Polarization, Design and modelling, Clouds, Carbon monoxide, Atmospheric modeling

Read Abstract +

Proceedings Article | 12 July 2023 Open Access

The Copernicus CO2M payload for monitoring anthropogenic carbon dioxide emissions

D. Serre, A. Dussaux, G. Bazalgette Courrèges-Lacoste, Y. Durand, A. Pasquet, C. Pachot, A. Chanumolu, F. Te Hennepe

Proceedings Volume 12777, 1277736 (2023) https://doi.org/10.1117/12.2690340

KEYWORDS: Equipment, Carbon dioxide, Spectroscopy, Imaging systems, Nitrogen dioxide, Short wave infrared radiation, Clouds, Radio optics, Calibration, Astronomical imaging

Read Abstract +

DOWNLOAD PAPER

Proceedings Article | 12 July 2023 Open Access

COPERNICUS Sentinel-4: calibration campaign results and performances

G. Bazalgette Courrèges-Lacoste, O. Seger, B. Oexl, M. Harlander, S. Riedl, S. Becher, J.-F. Pittet, B. Ahlers, A. Chanumolu, M. Miler, Y. Aoun, A. Pasquet, M. Dobber, F. Ruethrich, S. Gimeno Garcia

Proceedings Volume 12777, 1277735 (2023) https://doi.org/10.1117/12.2690338

KEYWORDS: Equipment, Calibration, Polarization, Light sources and illumination, Radiometric calibration, Stray light, Spectral response, Spectral calibration, Light sources, Sun

Read Abstract +

DOWNLOAD PAPER

Proceedings Article | 28 October 2022 Presentation + Paper

Copernicus CO2M mission for monitoring anthropogenic carbon dioxide emissions from space: payload status

Y. Durand, G. Bazalgette Courrèges-Lacoste, C. Pachot, A. Pasquet, A. Chanumolu, Y. Meijer, V. Fernandez, S. Lesschaeve, D. Spilling, A. Dussaux, D. Serre, F. te Hennepe

Proceedings Volume 12264, 1226405 (2022) https://doi.org/10.1117/12.2636158

KEYWORDS: Sensors, Spectroscopy, Satellites, Short wave infrared radiation, Imaging systems, Spatial resolution, Space operations, Polarization, Optics manufacturing, Carbon dioxide

Read Abstract +

Proceedings Article | 6 September 2019 Paper

Expected performance and error analysis for SPEXone, a multi-angle channeled spectropolarimeter for the NASA PACE mission

Jeroen Rietjens, Jochen Campo, Anantha Chanumolu, Martijn Smit, Raj Nalla, Cristina Fernandez, Jos Dingjan, Aaldert van Amerongen, Otto Hasekamp

Proceedings Volume 11132, 1113208 (2019) https://doi.org/10.1117/12.2530729

KEYWORDS: Polarimetry, Error analysis, Polarization, Modulation, Aerosols, Environmental sensing, Atmospheric corrections, Atmospheric particles, Aerospace engineering, Space operations

Read Abstract +

SPEXone is a compact five–angle spectropolarimeter that is being developed as a contributed payload for the NASA Plankton, Aerosol, Cloud and ocean Ecosystem (PACE) observatory, to be launched in 2022. SPEXone will provide accurate atmospheric aerosol characterization from space for climate research, as well as for light path correction in support of the main Ocean Color Instrument. SPEXone employs dual beam spectral polarization modulation, in which the state of linear polarization is encoded in a spectrum as a periodic variation of the intensity. This technique enables high polarimetric accuracies in operational environments, since it provides snapshot acquisition of both radiance and polarization without moving parts. This paper presents the polarimetric error analysis and budget for SPEXone in terms of polarimetric precision and polarimetric accuracy. We consider factors that contribute to instrumental polarization and modulation efficiency, which will be calibrated on-ground with high, but finite accuracy. The sensitivity to dynamic systematic effects in a space environment, such as degradation and ageing of components and small variations in the temperature and thermal gradients is addressed and quantified. Finally, the impact of scene dependent error sources, mainly resulting from stray light, are assessed and the total polarimetric error budget is presented. We show that SPEXone complies with the radiometric SNR requirement of 300, yielding a minimum polarimetric precision of 200 (fully polarized light) to 300 (unpolarized light) over the full spectral range for dark ocean scenes at high solar zenith angle. Assuming a stray light correction factor of 5 and considering a moderate contrast scene, the expected in-flight polarimetric accuracy of SPEXone is 1.5 · 10⁻³ for unpolarized scenes and 2.9 · 10⁻³ for highly polarized scenes, compliant with the polarimetric accuracy requirement. This performance should enable SPEXone to deliver the data quality that enables unprecedented aerosol characterization from space on the NASA PACE mission.

Proceedings Article | 10 July 2018 Paper

Physical modeling of echelle spectrographs: the CARMENES case study

M. Tala Pinto, A. Chanumolu, A. Quirrenbach, S. Reffert, M. Zechmeister, F. Bauer

Proceedings Volume 10705, 107051U (2018) https://doi.org/10.1117/12.2313211

KEYWORDS: Spectrographs, Collimators, Ray tracing, Cameras, Data modeling, Mirrors, Calibration, Instrument modeling

Read Abstract +

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

Read Abstract +

Showing 5 of 7 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