1. 1 DIABLO De-rotated Imager of the Aurora Borealis in Low-Earth Orbit Interim Review 1 Nicole Demandante Laura Fisher Jason Gabbert Lisa Hewitt Lang Kenney Nick Pulaski Matt Sandoval Tim Sullivan Advisors: Alex Hoehn Joe Footdale Nicole Demandante Laura Fisher Jason Gabbert Lisa Hewitt Lang Kenney Nick Pulaski Matt Sandoval Tim Sullivan Advisors: Alex Hoehn Joe Footdale

2. 2 Agenda  Resolution of Issues  Design Update  Test Plan  Schedule  Budget  Current Status  Current Issues to be Resolved  Resolution of Issues  Design Update  Test Plan  Schedule  Budget  Current Status  Current Issues to be Resolved

3. 3 Request for Action  “Re-evaluate the 'tombstone' to 'bearing ring' design features including the worm and gear”  Nutation simulation test has been redesigned  Bearing structure has been redesigned  “Re-evaluate the 'tombstone' to 'bearing ring' design features including the worm and gear”  Nutation simulation test has been redesigned  Bearing structure has been redesigned

4. 4 Design Update Mass: 42.0 kg Mass: 27.8 kg 96cm98cm

5. 5 Design Update  New bearings – Kaydon “Reali-Slim”  2 Angular Contact  4.25" ID x 4.75" OD  0.25" Wide  0.09kg each  1 X-Type (4 point contact)  7.5” ID x 8” OD  0.15kg  New bearings – Kaydon “Reali-Slim”  2 Angular Contact  4.25" ID x 4.75" OD  0.25" Wide  0.09kg each  1 X-Type (4 point contact)  7.5” ID x 8” OD  0.15kg

6. 6 Design Update  New preload design

7. 7 Design Update  Bearing structure  1° Offset Test  Bearing structure  1° Offset Test

8. 8 Testing  Component Tests  Camera  Slip Ring  Encoder  Accelerometer  Motor  Subsystem Tests  Structural  Motor with accelerometers, encoders  Slip rings with encoders, camera, motor signal  Signal conditioning  System Tests  Measure accelerometer data  Take pictures  Use laser pointer  1º offset tilt  Software Tests  Data collection: encoders and accelerometers  Counter and index pulse reset  Control loop with motors/encoders  Calibration with full system  Component Tests  Camera  Slip Ring  Encoder  Accelerometer  Motor  Subsystem Tests  Structural  Motor with accelerometers, encoders  Slip rings with encoders, camera, motor signal  Signal conditioning  System Tests  Measure accelerometer data  Take pictures  Use laser pointer  1º offset tilt  Software Tests  Data collection: encoders and accelerometers  Counter and index pulse reset  Control loop with motors/encoders  Calibration with full system

9. 9 Testing  Pointing within 3º  Component Test – Encoder  Measure noise on oscilloscope  Test signal conditioning  Software Tests  Quantify frequency of dropped/added pulses  Verify that index pulse resets counter  Test control loop with motors and encoders  System Test  Verify pointing accuracy with laser pointer  Field of view minimum of 12º  Component Test – Camera  Determine zoom needed for 12º FOV  Subsystem Test – Structures  Take pictures through optics tube  Pointing within 3º  Component Test – Encoder  Measure noise on oscilloscope  Test signal conditioning  Software Tests  Quantify frequency of dropped/added pulses  Verify that index pulse resets counter  Test control loop with motors and encoders  System Test  Verify pointing accuracy with laser pointer  Field of view minimum of 12º  Component Test – Camera  Determine zoom needed for 12º FOV  Subsystem Test – Structures  Take pictures through optics tube

10. 10 Testing  Take pictures at 90º  Subsystem Test – Structures  Measure pointing with laser pointer  Verify mirror mounting accuracy  Image Clarity  Component Test – Slip Ring  Measure noise with LabVIEW and Oscilloscope  Quantify amplitude and frequency of noise  Examine effects on USB transfer, motor control signal, encoder signal  System Tests  Record data with LabVIEW  Measure amplitude and frequency of vibrations with accelerometers  Analyze encoder data to determine magnitude of motor fluctuations  Analyze pictures to quantify pixel smear  Take pictures at 90º  Subsystem Test – Structures  Measure pointing with laser pointer  Verify mirror mounting accuracy  Image Clarity  Component Test – Slip Ring  Measure noise with LabVIEW and Oscilloscope  Quantify amplitude and frequency of noise  Examine effects on USB transfer, motor control signal, encoder signal  System Tests  Record data with LabVIEW  Measure amplitude and frequency of vibrations with accelerometers  Analyze encoder data to determine magnitude of motor fluctuations  Analyze pictures to quantify pixel smear

11. 11 Testing  Test bed range: 2 – 20 rpm  Component Test – Motor  Measure built-in speed output with oscilloscope  Verify voltage/speed curve  Subsystem Test – Motor  Measure encoder signal in LabVIEW  Use encoders to verify voltage/speed after gearing  Nutation Simulation  Subsystem Test – Structures  Measure pointing with laser pointer  Verify 1º tilt  System Test  Run full system tests with 1º tilt  Analyze pixel smear, observe pointing error  Test Camera similar to flight Camera  Component Test – Camera  Set shutter speed to 100ms  Test bed range: 2 – 20 rpm  Component Test – Motor  Measure built-in speed output with oscilloscope  Verify voltage/speed curve  Subsystem Test – Motor  Measure encoder signal in LabVIEW  Use encoders to verify voltage/speed after gearing  Nutation Simulation  Subsystem Test – Structures  Measure pointing with laser pointer  Verify 1º tilt  System Test  Run full system tests with 1º tilt  Analyze pixel smear, observe pointing error  Test Camera similar to flight Camera  Component Test – Camera  Set shutter speed to 100ms

12. 12 Schedule  Ordering Parts  Electronics Fabrication  Component, Subsystem Testing  Ordering Parts  Electronics Fabrication  Component, Subsystem Testing

13. 13 Schedule  Manufacturing & Integration

14. 14 Schedule  Software, System Testing

15. 15 Budget Total Spent: $4349.56 (as of 2/3) Expect to Spend: $699.45 (not including margin) Total Budget: $5802.30 (including 15% margin)

16. 16 Current Status  Parts Received  Encoders  Slip Rings  Motors  Camera  Some aluminum  Parts Ordered  Bearings  Manufactured items  Bottom box structure  Top plate  Mirror mount  Parts Received  Encoders  Slip Rings  Motors  Camera  Some aluminum  Parts Ordered  Bearings  Manufactured items  Bottom box structure  Top plate  Mirror mount

17. 17 Current Issues to be Resolved  Flange – shaft to plate connection  Part received is incorrect size  Have found usable part from McMaster-Carr  Flange – shaft to plate connection  Part received is incorrect size  Have found usable part from McMaster-Carr

18. 18 Questions?