1. Designing an Intensified Photodiode Mount
MAIA Sensor System:
Designing an Intensified Photodiode Mount
Keizo Gates
Akamai Internship

2. Overview MAIA Laser System MAIA Sensor MAIA Receiver
The Need for a Mount
The Design Process
The Final Result

3. The Big Picture
Existing MAIA Laser in the Beam Director/Tracker (BD/T) telescope
2500 Hz max rep rate
11 ns pulse length
54 MW peak power
AEOS 3.67 m telescope
Largest in the Dept of Defense
Using Coudé room 5
The MAIA Sensor System
Talk about the two telescopes
Where the maia sensor is located
Brief on applications.. Ranging, radiometry

4. The MAIA Sensor System Used in the AEOS Consists of Collection optics
Intevac Intensified Photodiode sensor
Supporting electronics
Real time data collection and processing
RT Linux PC
Signal processing
Software
three major components in the sensor system

5. The MAIA Receiver Box Bread-board Optics A refrigeration unit
Intensified Photodiode sensor inside
Overall system enclosure
Existing CAD by Charlie Crandall
Explain everything on the board.
Explain my task.

6. Identify the Problem Need to Secure the IPD Sensor
Mount 15mm lens & allow for 10mm focus adjustment
Contain the BiasT & Amp
Products for Research
Thermal Cooler

7. Design Process Brainstorm possible solutions Select the best idea
Sketch, research opto-mechanics
Gather input
Select the best idea
Detail design
Communicate the result
Prototype the product

8. Design Details Constraints, Issues & Concerns Length limitations
Fixing the sensor without stress
Containing BiasT, Amplifier, & Wires
Securing the lens assembly
Temperature

9. Design Analysis Amp heat concerns Thermal expansion concerns
P=k*A/L*∆T
P=1 Watt, solve eq; ∆T << 1
Thermal expansion concerns
∆x = CTE*∆T*d
Solve for ∆x; ∆x = .013 mm << tolerances
Neither are major issues
Small part
Small temperature change
1 W Power

10. Final Design Part List
Review each part

11. Final Design Cross Section
Assembly that fits into Products for Research cooling unit.
Point out sensor, bias T, Amplifier, amp mount
Point out custom part
Say how the sensor is secured
Point out lens assembly, O ring,
Explain lens movement

12. Final Design CAD Point out the custom aluminum part
Point out the amp mount

13. Conclusions Design consists of one custom part Next Steps
Interfaced with Thorlabs components
Two modified Thorlabs components
Next Steps
Machine the parts
Assemble the parts
Install into the MAIA Sensor box

14. Acknowledgements Textron Systems Hawai’i Products for Research
Paul Konkola, Charlie Crandall, Michael Reiley
Products for Research
Center for Adaptive Optics
Malika Bell, Lisa Hunter, Hillary O’Bryan
Maui Economic and Development Board
Isla Yap
References
AMOS:
Textron Systems:

15. Questions?