Open Access
Subscription Access
Imaging Infrared Spectrometer onboard Chandrayaan-2 Orbiter
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.
User
Font Size
Information
- Banerjee, A. et al., SW–MW infrared spectrometer for lunar mission. In Proceedings of SPIE 9880, Multispectral, Hyperspectral, and Ultraspectral Remote Sensing Techniques and Applications VI, 98801F, 30 April 2016; doi:10.1117/12.2228225.
- Kiran Kumar, A. S. et al., Hyper Spectral Imager for lunar mineral mapping in visible and near infrared band. Curr. Sci., 2009, 96(4), 496–499.
- Pieters, C. M. et al., The Moon mineralogy mapper (M3) on Chandrayaan-1. Curr. Sci., 2009, 96(4), 500–505.
- Mall, U. et al., Near Infrared Spectrometer SIR-2 on Chandrayaan1. Curr. Sci., 2009, 96(4), 506–511.
- Pieters, C. M. et al., Character and spatial distribution of OH/H2O on the surface of the Moon seen by M3 on Chandrayaan-1. Science, 2009, 326, 568–572.
- Clark, R. N., Detection of adsorbed water and hydroxyl on the Moon. Science, 2009, 326, 562–564.
- Sunshine, J. M. et al., Temporal and spatial variability of lunar hydration as observed by the deep impact spacecraft. Science, 2009, 326, 565–568.
- Klima, R. et al., Remote detection of magmatic water in Bullialdus Crater on the Moon. Nature Geosci., 2013, 6, 737–741.
- Bhattacharya, S. et al., Endogenic water on the Moon associated with non-mare silicic volcanism: implications for hydrated lunar interior. Curr. Sci., 2013, 105, 685–691.
- 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.
Abstract Views: 428
PDF Views: 152