MAIA Sensor System:Designing an Intensified Photodiode Mount

Keizo Gates

Akamai Internship

Overview

• MAIA Laser System

• MAIA Sensor

• MAIA Receiver

• The Need for a Mount

• The Design Process

• The Final Result

The Big PictureExisting 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

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

The MAIA Receiver Box

• Bread-board• Optics• A refrigeration

unit– Intensified

Photodiode sensor inside

• Overall system enclosure

Identify the Problem

• Need to– Secure the IPD

Sensor– Mount 15mm lens &

allow for 10mm focus adjustment

– Contain the BiasT & Amp

Products for ResearchThermal Cooler

Design Process

• Brainstorm possible solutions– Sketch, research opto-

mechanics– Gather input

• Select the best idea• Detail design• Communicate the

result• Prototype the product

Design Details

• Constraints, Issues & Concerns

– Length limitations– Fixing the sensor

without stress– Containing BiasT,

Amplifier, & Wires– Securing the lens

assembly– Temperature

Design Analysis

• Amp heat 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

T1 T2

1 W Power

Final Design Part List

Final Design Cross Section

Final Design CAD

Conclusions

• Design consists of one custom part– Interfaced with Thorlabs components– Two modified Thorlabs components

• Next Steps– Machine the parts – Assemble the parts– Install into the MAIA Sensor box

Acknowledgements

• Textron Systems Hawai’i– 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: http://www.maui.afmc.af.mil/– Textron Systems: http://www.systems.textron.com

Questions?