Supervising Professor: Dr. Jorge Rocca Senior: Michael M. Rader - PowerPoint PPT Presentation

Supervising Professor: Dr. Jorge Rocca Senior: Michael M. Rader Team Members: David Yazdani Reed Hollinger Clayton Bargsten Mark Woolston

• This is a continuing project - System already existed, building on Summer research work and previous senior design project. - Goal is to replicate system three more times Additional goal is to identify any bugs or needed - features

Beam Alignment Top-Down View of Alignment Arrangement - Allows four degrees of freedom, adjusting position and angle

Beam Alignment Top-Down View of Alignment Arrangement - Allows four degrees of freedom, adjusting position and angle …Why is precision alignment important?

Necessity of Beam Alignment • PRECISION/ACCURACY • PREDICTABILITY • POWER TRANSFER

Necessity of Beam Alignment • PRECISION/ACCURACY • PREDICTABILITY • POWER TRANSFER …okay, so what causes misalignment?

Misalignment WARPING OF OPTICAL TABLE VIBRATION TEMPERATURE VARIATION

Stepper Motor - Linear Actuators - 7.5 V Step Input - 1.5 µm linear travel/step

Feedback Detection Pacific Silicon QP50-6-18U-SD2 Quadrant Photodiode Image courtesy of Pacific Silicon

Feedback Detection - Photocurrent is produced when beam strikes diode - Photocurrent is passed into a current to voltage amplifier - Chip returns Top-Bottom, Left-Right and Sum of voltages Image courtesy of Pacific Silicon

Algorithm Microcontroller - Texas Instruments MSP430FG4618 - Code written in C - Passes output to motor driver PCB

Motor Driver PCB • Product of previous Senior design project • Interprets input from Microcontroller to control the motors • Can adjust step size to: Full, 1/2, 1/4, or 1/16 Allegro A3979

Wireless PCB • Used for manual alignment • Wireless TX/RX • Decoder/Encoder

Front Panel • LCD Display shows which mount is selected and which speed the motors are stepping at. • LEDs indicate which direction motors are moving • Logic prevents non-expected inputs such as multiple directional selections at the same time

Back Panel Design

Back Panel Design • Hirose Shielded Bayonet Lock Circular Connectors connected to shielded wire. • Improved SNR, Portability and Aesthetics

Code Revisions

Code Revisions • Deleted unused variables and code • Added Function Prototyping • Consolidated 8 functions into single function • Added comments

Installation and Testing • Two systems assembled and tested in temporary system • Both systems installed and tested in lab

BUDGET • Bayonet Lock RF Connectors ~ $680 • Linear Actuators for Next Two Systems ~$1700 • Quadrant Photodiodes for Next Two Systems ~$800 • Current Total ~ $3,180

• Finish purchasing parts for next two systems and assemble • Implement feature that will stop the motors from moving when the beam is broken

• David Yazdani • Reed Hollinger and Clayton Bargsten • Mark Woolson • Dr. Jorge Rocca

• David Yazdani • Reed Hollinger and Clayton Bargsten • Mark Woolson • Dr. Jorge Rocca