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Chakraborty, P.

Lyman Alpha Photometer: a far-ultraviolet sensor for the study of hydrogen isotope ratio in the Martian exosphere

Abstract Views :284 | PDF Views:95

Authors

Raja V. L. N. Sridhar ¹, M. V. H. Rao ¹, K. Kalyani ¹, Anand Chandran ¹, Monika Mahajan ¹, J. D. P. V. Tayaramma ¹, K. V. S. Bhaskar ¹, K. B. Pramod ¹, L. V. Prasad ¹, A. S. Laxmiprasad ¹, P. Chakraborty ¹, J. A. Kamalakar ¹, G. Nagendra Rao ¹, M. Viswanathan ¹

Affiliations
1 Laboratory for Electro-Optics Systems, Indian Space Research Organisation, Bengaluru 560 058, IN

Source

Current Science, Vol 109, No 6 (2015), Pagination: 1114-1120

Abstract

The Lyman Alpha Photometer (LAP), developed for flight on the Mars Orbiter Mission (MOM) spacecraft in 2013, is primarily designed to measure deuterium to hydrogen abundance ratio of the Martian exosphere over a 6-month period from a 263 km × 71,358 km elliptical orbit around Mars. A set of ultrapure (99.999%) hydrogen and deuterium gas-filled cells comprising tungsten filaments, a 25 mm diameter collection lens and a solar-blind photomultiplier tube together with an 8 nm bandpass Lyman alpha filter are the principal electro-optical assemblies of the instrument. This article presents scientific objectives of LAP and its performance specifications along with details of instrument design. The ground characterization techniques to assess LAP operational performance are also presented. End-to-end test results and evaluation matrix of LAP were satisfactory, well within the desired specifications. The first LAP onboard operation was carried out during the cruise phase of MOM spacecraft journey to verify its functionality and all recorded on-board health parameters were satisfactory.

Keywords

Absorption gas cell, hydrogen isotope ratio, Martian exosphere, photometer

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References

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SCATSAT-1 Scatterometer:An Improved Successor of OSCAT

Abstract Views :259 | PDF Views:98

Authors

T. Misra ¹, P. Chakraborty ¹, C. Lad ¹, P. Gupta ¹, J. Rao ¹, G. Upadhyay ¹, S. Vinay Kumar ¹, B. Saravana Kumar ¹, S. Gangele ¹, S. Sinha ¹, H. Tolani ¹, V. K. Vithani ¹, B. S. Raman ¹, C. V. N. Rao ¹, D. B. Dave ¹, R. Jyoti ¹, N. M. Desai ¹

Affiliations
1 Space Applications Centre, ISRO, Ahmedabad 380 015, IN

Source

Current Science, Vol 117, No 6 (2019), Pagination: 941-949

Abstract

SCATSAT-1 is the Indian Space Research Organisation’s (ISRO’s) newest Ku-band scatterometer which was launched on 26 September 2016 from ISRO’s space-port Sriharikota on-board the PSLV C35 mission. It is an advanced follow-on of OSCAT, ISRO’s first Scatterometer in space on-board the Oceansat-2 satellite, which ceased to operate in April 2014. OSCAT had been a globally acclaimed sensor during its lifetime. The data from SCATSAT-1 exhibit superior quality, and will not only serve the operational wind and weather prediction community in the years to come, but also hold the promise of securing a place in the long-term climate data records. SCATSAT-1 is a standalone scatterometer mission atop the Indian Mini Satellite (IMS-2) bus. The scatterometer payload is a two-beam, dual-polarized, conically scanning, pencil beam, real-aperture radar which measures near-surface wind vectors over ocean exploiting Bragg scattering resonance at Ku-band. It has been developed in ISRO’s Space Applications Centre, Ahmedabad in less than two and half years to replace OSCAT. Although it inherits the instrument specifications from OSCAT, several enhancements have been made in its hardware as well as in the payload characterization from the purview of miniaturization and performance improvement over OSCAT. This article highlights the hardware improvements, the payload characterization methods devised, and the performance enhancements of SCATSAT-1 over OSCAT. The in-orbit performance of SCATSAT-1 is also discussed.

Keywords

OSCAT, SCATSAT-1, Scatterometer, Sigma-0.

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References

Misra, T. et al., Oceansat-II scatterometer: sensor performance evaluation, σ 0 analyses and estimation of biases. IEEE Trans. Geosci. Remote Sensing, 2014, 52(6), 3310–3315.

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Current Science

Current Science

Author Details

Chakraborty, P.

Lyman Alpha Photometer: a far-ultraviolet sensor for the study of hydrogen isotope ratio in the Martian exosphere

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SCATSAT-1 Scatterometer:An Improved Successor of OSCAT

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Biodiversity and Climate Change: Sustainable Development Perspective

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