11
Earth Science Projects for Olin College Students: J. Vanderlei Martins UMBC Physics Department and NASA GSFC Climate and Radiation Branch 1. CCD Detection System for Rainbow Camera CCD readout system for specific lines of the CCD 2. CubeSat Sun-Sensor CCD or CMOS based Position Sensing Detector Based (http://www.on-trak.com/theory.html ) Solar Cell based 3. CubeSat Attitude Control System Sun-Sensor to determine pointing Magnetorquers to control the satellite’s attitude

CCD Detection System for Rainbow Camera CCD readout system for specific lines of the CCD

  • Upload
    morse

  • View
    66

  • Download
    0

Embed Size (px)

DESCRIPTION

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 - PowerPoint PPT Presentation

Citation preview

Page 1: CCD Detection System for Rainbow Camera  CCD readout system for specific lines of the CCD

Earth Science Projects for Olin College Students:J. Vanderlei Martins UMBC Physics Department

and NASA GSFC Climate and Radiation Branch

1. CCD Detection System for Rainbow Camera– CCD readout system for specific lines of the CCD

2. CubeSat Sun-Sensor– CCD or CMOS based– Position Sensing Detector Based (

http://www.on-trak.com/theory.html)

– Solar Cell based

3. CubeSat Attitude Control System– Sun-Sensor to determine pointing– Magnetorquers to control the satellite’s attitude

Page 2: CCD Detection System for Rainbow Camera  CCD readout system for specific lines of the CCD

Science – The Big Picture: Interaction Between Aerosols and Clouds

Andreae, et al. – Science 2004Smoking Rain Clouds over the Amazon

Page 3: CCD Detection System for Rainbow Camera  CCD readout system for specific lines of the CCD

Cloud Droplet Measurements from Cloud Rainbow

F-M. Breon, P. Goloub, 1998.

Page 4: CCD Detection System for Rainbow Camera  CCD readout system for specific lines of the CCD

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

Page 5: CCD Detection System for Rainbow Camera  CCD readout system for specific lines of the CCD

Example of stripe filter: need to read only one line in the center of each stripe

Page 6: CCD Detection System for Rainbow Camera  CCD readout system for specific lines of the CCD

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

Page 7: CCD Detection System for Rainbow Camera  CCD readout system for specific lines of the CCD

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

10

0.2 0.4 0.6 0.8 1

Reflectance Ratio 2.1/2.25mm

Tem

per

atu

re (C

)

ice

water

mixed

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

10

0 10 20 30 40

Effective Radius (mm)

Tem

per

atu

re (C

)

ice

water

mixed

Collision-Coalescence

Water-ice processes

Aerosol Impactin Microphysics?

water

mixed phase

ice

Ratio 2.1/2.25mm

Proxy for ice/waterseparation

Ratio 2.1/2.25mm

Proxy for ice/waterseparation

Temperature

ice

Water

More Science: Cloud-Side Profiling

Page 8: CCD Detection System for Rainbow Camera  CCD readout system for specific lines of the CCD

Radiator face

Cloud CubeSatCloud CubeSatOrbit Geometry:Orbit Geometry:

Page 9: CCD Detection System for Rainbow Camera  CCD readout system for specific lines of the CCD

Sun-Sensor

CMOS Detector Array

Ex: SunSensor from Nat. Cheng Kung University for the PACE CubeSat

Cloud-CubeSat

Other options:•PSD – analog position sensitive detector•Solar cell pyramid

Page 10: CCD Detection System for Rainbow Camera  CCD readout system for specific lines of the CCD

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

Page 11: CCD Detection System for Rainbow Camera  CCD readout system for specific lines of the CCD

Mag

neto

rque

r C

oils

Use Sun-Sensor signal to align one face of the satellite (or solar panel) to

the sun