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- Ankush Kumar
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- A. S. Kiran Kumar
- Arup Roy Chowdhury
- Arup Banerjee
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- Satadru Bhattacharya
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Dutta, Moumita
- Methane Sensor for Mars
Abstract Views :238 |
Authors
Kurian Mathew
1,
S. S. Sarkar
1,
A. R. Srinivas
1,
Moumita Dutta
1,
Minal x Minal Rohit
1,
Harish Seth
1,
Rajiv Kumaran
1,
Kshitij Pandya
1,
Ankush Kumar
1,
Jitendra Sharma
1,
Jalshri Desai
1,
Amul Patel
1,
Vishnu Patel
1,
Piyush Shukla
1,
S. Manthira Moorthi
1,
Aravind K. Singh
1,
Ashutosh Gupta
1,
Jaya Rathi
1,
P. Narayana Babu
1,
Saji A. Kuriakose
1,
D. R. M. Samudraiah
1,
A. S. Kiran Kumar
1
Affiliations
1 Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 058, IN
1 Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 058, IN
Source
Current Science, Vol 109, No 6 (2015), Pagination: 1087-1096Abstract
Methane Sensor for Mars (MSM), on-board Mars Orbiter Mission is a differential radiometer based on Fabry–Perot Etalon (FPE) filters which measures column density of methane in the Martian atmosphere. It is the first FPE sensor ever flown to space. Spectral, spatial and radiometric performances of the sensor were characterized thoroughly during the pre-launch calibration. Geophysical calibration of the sensor was carried out using the data acquired over Sahara desert during Earth Parking Orbit phase. Retrieval algorithm for MSM, which is based on the linearization of radiative transfer equations, gets simultaneous solutions for CH4 and CO2 concentrations in the Martian atmosphere.Keywords
Differential radiometer, Fabry–Perot Etalon, geophysical calibration, methane sensor, retrieval algorithm.Full Text
References
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- Imaging Infrared Spectrometer onboard Chandrayaan-2 Orbiter
Abstract Views :262 |
PDF Views:95
Authors
Arup Roy Chowdhury
1,
Arup Banerjee
1,
S. R. Joshi
1,
Moumita Dutta
1,
Ankush Kumar
1,
Satadru Bhattacharya
1,
Amitabh
1,
Sami Ur Rehman
1,
Sunil Bhati
1,
J. C. Karelia
1,
Amiya Biswas
1,
Anish R. Saxena
1,
Satish Sharma
1,
Sandip R. Somani
1,
H. V. Bhagat
1,
Jitendra Sharma
1,
D. N. Ghonia
1,
B. B. Bokarwadia
1,
Ajay Parasar
1
Affiliations
1 Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, IN
1 Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, IN
Source
Current Science, Vol 118, No 3 (2020), Pagination: 368-375Abstract
Imaging Infrared Spectrometer (IIRS) is an imaging hyperspectral instrument for mineralogy of the lunar surface (including the hydroxyl signature). IIRS operates in the 0.8–5 μm spectral range with about 250 contiguous bands. It has 80 m ground sampling distance and 20 km swath at nadir from 100 km orbit altitude. Optical design is based on fore-optics and Offner (convex multi-blazed grating)-type spectrometer. Focal plane array is HgCdTe (mercury–cadmium–telluride)- based actively cooled to 90 K, having 500 × 256 pixels format with 30 μm pixel size. Electronics comprises proximity, logic and control, power supply and cooler drive electronics. Mechanical system is realized to house various subsystems, namely optics, detector, electronics and thermal components meeting the structural, opto-mechanical thermal component and alignment requirements. Thermal system is designed such that the instrument is cooled and maintained at fixed temperature to reduce and control instrument background. Aluminum-based mirror, grating and housing are developed to maintain structural as well as opto-mechanical and thermal requirements. This article presents IIRS realization and spectroradoimetric performance.Keywords
Hyperspectral Imaging, Infrared Spectrometer, Moon, Orbiter.References
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- Bhattacharya, S. et al., Detection of hydroxyl-bearing exposures of possible magmatic origin on the central peak of crater Theophilus using Chandrayaan-1 Moon Mineralogy Mapper (M3) data. Icarus, 2015, 260, 167–173.
- Li, S. et al., Water on the surface of the Moon as seen by the Moon Mineralogy Mapper: distribution, abundance and origins. Sci. Adv., 2017, 3, e1701471.
- Milliken, R. E. and Li, S., Remote detection of widespread indigenous water in lunarpyroclastic deposits. Nature Geosci., 2017, 10, 561–565.