LED characterization for development of on-board calibration unit of CCD-based advanced wide-field sensor camera of Resourcesat-2A

Abhijit Chatterjee; Anurag Verma

doi:10.1117/12.2223554

2 May 2016 LED characterization for development of on-board calibration unit of CCD-based advanced wide-field sensor camera of Resourcesat-2A

Abhijit Chatterjee, Anurag Verma

Author Affiliations +

Proceedings Volume 9881, Earth Observing Missions and Sensors: Development, Implementation, and Characterization IV; 98811W (2016) https://doi.org/10.1117/12.2223554
Event: SPIE Asia-Pacific Remote Sensing, 2016, New Delhi, India

Abstract

The Advanced Wide Field Sensor (AWiFS) camera caters to high temporal resolution requirement of Resourcesat-2A mission with repeativity of 5 days. The AWiFS camera consists of four spectral bands, three in the visible and near IR and one in the short wave infrared. The imaging concept in VNIR bands is based on push broom scanning that uses linear array silicon charge coupled device (CCD) based Focal Plane Array (FPA). On-Board Calibration unit for these CCD based FPAs is used to monitor any degradation in FPA during entire mission life. Four LEDs are operated in constant current mode and 16 different light intensity levels are generated by electronically changing exposure of CCD throughout the calibration cycle. This paper describes experimental setup and characterization results of various flight model visible LEDs (λ_P=650nm) for development of On-Board Calibration unit of Advanced Wide Field Sensor (AWiFS) camera of RESOURCESAT-2A. Various LED configurations have been studied to meet dynamic range coverage of 6000 pixels silicon CCD based focal plane array from 20% to 60% of saturation during night pass of the satellite to identify degradation of detector elements. The paper also explains comparison of simulation and experimental results of CCD output profile at different LED combinations in constant current mode.

Citation Download Citation

Abhijit Chatterjee and Anurag Verma "LED characterization for development of on-board calibration unit of CCD-based advanced wide-field sensor camera of Resourcesat-2A", Proc. SPIE 9881, Earth Observing Missions and Sensors: Development, Implementation, and Characterization IV, 98811W (2 May 2016); https://doi.org/10.1117/12.2223554

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KEYWORDS

Light emitting diodes

Charge-coupled devices

Calibration

Sensors

Cameras

CCD image sensors

Silicon

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