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Earth Science Projects for Olin College Students: J. Vanderlei Martins UMBC Physics Department and NASA GSFC Climate and Radiation Branch. CCD Detection System for Rainbow Camera CCD readout system for specific lines of the CCD CubeSat Sun-Sensor CCD or CMOS based
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Earth Science Projects for Olin College Students:J. Vanderlei Martins UMBC Physics Departmentand NASA GSFC Climate and Radiation Branch CCD Detection System for Rainbow Camera CCD readout system for specific lines of the CCD CubeSat Sun-Sensor CCD or CMOS based Position Sensing Detector Based (http://www.on-trak.com/theory.html) Solar Cell based CubeSat Attitude Control System Sun-Sensor to determine pointing Magnetorquers to control the satellite’s attitude
Science – The Big Picture: Interaction Between Aerosols and Clouds Andreae, et al. – Science 2004Smoking Rain Clouds over the Amazon
Cloud Droplet Measurements from Cloud RainbowF-M. Breon, P. Goloub, 1998.
Project 1- CCD Detection System for Rainbow Camera • Interested in Only Selected lines of the CCD • Most CCD/Cameras allow for windowing or binning but not for reading “a bunch” of selected lines along the CCD. • Reading only selected lines increases speed and reduces data volume
Example of stripe filter: need to read only one line in the center of each stripe
Project 2 - CubeSat Sun-Sensor • One face of the satellite must always point to the sun • maximizes solar incidence in the solar panel • Assures optimum geometry for cloud-side measurements • Feedback from Sun-Sensor increases accuracy of the Attitude and Determination Control System
More Science: Cloud-Side Profiling ice Temperature Water ice Aerosol Impact in Microphysics? mixed phase Water-ice processes water Collision-Coalescence
Radiator face Cloud CubeSatOrbit Geometry:
Sun-Sensor Cloud-CubeSat Ex: SunSensor from Nat. Cheng Kung University for the PACE CubeSat • Other options: • PSD – analog position sensitive detector • Solar cell pyramid CMOS Detector Array
Project 3 - CubeSat Attitude Control System • Can we control the attitude of the satellite using Earth’s magnetic field • How much torque is needed and how to implement an active control system to keep one face of the satellite always pointing to the sun. • Sun-Sensor can be used as feedback mechanism
Use Sun-Sensor signal to align one face of the satellite (or solar panel) to the sun Magnetorquer Coils