Tribute to Bryan Preas April 1, 2014 Scott Elrod Vice President - - PowerPoint PPT Presentation

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Tribute to Bryan Preas April 1, 2014 Scott Elrod Vice President - - PowerPoint PPT Presentation

Mar 31, 2024 121 likes •412 views

Tribute to Bryan Preas April 1, 2014 Scott Elrod Vice President Hardware Systems Laboratory PARC, a Xerox Company elrod@parc.com Time Period from 2000 - 2012 (The Do-Whatever-It-Takes System Engineering Period) Airjet Paper Mover (~

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Tribute to Bryan Preas April 1, 2014

Scott Elrod Vice President Hardware Systems Laboratory PARC, a Xerox Company elrod@parc.com

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Time Period from 2000 - 2012

(The Do-Whatever-It-Takes System Engineering Period)

  • Airjet Paper Mover (~ 2000)
  • Hypermodular TIPP (~ 2004)
  • Bioagent Detection (~ 2006)
  • Digital X-Ray System (~ 2010)
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Airjet Actuation

Paper Airjet Velocity Paper Air y Velocity

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Shear Force

Air jet Plenum Flap valve

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Sensor conditioning Selfoc array V low V high Ground Blower Paper CMOS linear sensor array Hi V drivers Adhesive Laser Cut

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PCB Airjet Module

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System Designers

Real time: DSP’s 68 FPGA RAM Hi V drivers Valve Board Sensor Board PC Joystick

D Biegelsen P Cheung L Swartz J Reich B Preas K van Schuylenbergh A Berlin M Fromherz D Goldberg W Jackson JP Lu

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Airjet Video

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Dual Sided with Planned Path

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Hypermodular TIPP (Tightly Integrated Parallel Printing)

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Director assembly (3-way)

Solenoid Baffles Auto-ID Processor PCB Pogo Pins Flipper Shark fin cam Rotary mechanism Slide Idle roller Flipper

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210 ppm with four 55 ppm engines

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Planning and control

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Backplane PWB connector & auto-ID

  • PIC has flash to store board address, or has its own ID
  • PICs communicate with nearest neighbor PICs via IRDA (e.g. PiWest : PjEast, etc.)

then send to system memory the links (no physical location binding necessary)

  • On input requests from DSPs on PIC I/O lines, PIC sends out on same line PIC ID plus

2 bits for orientation. Then DSPs communicate their capabilities, location and orientation to system.

  • PCB can be oriented in any of the 4 directions

DSP

I/O

DSP

I/O 5V 24V

PIC

CAN Grd I/O1 IRDA3 IRDA1 I/O3

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Dry Powder Manipulation Using Traveling Electrostatic Waves (for Printing)

Phases A B C D Projection Field “Hopping ” mode “Surfing ” mode Gas Channel Toner Gating Aperture ATOM Grid

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Field Flow Fractionation + TW

TW moves particles to side edge Sample well

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3-Layer Scalable Traveling Wave (TW) Module

1

2

3

4

Pt TW traces Insulator Glass 4- Contact Pads Vias

Minimize trace voltage drop Minimize power consumption

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System Breadboard

Operation Cycle: Flush/CleanPrimeLoadConcentrateExtract

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TW Concentration: 3um & 10um beads

“Turning the corner” “Into the concentrate ….” Click on images to play movie

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Close-up of Concentration Cell

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Cavity Volume = 2.3 mL; Conc Volume ~ 2x1.5x1 = 3 L Concentration Factor = Cavity Vol/Conc Vol x (1-frac loss) ~ 700 x 0.25 = 175X

Concentration Factor

Pipette tip w/ air bubble

  • Conc. of 3um

& 6um polystyrene beads Before Concentration After Concentration

3 mm

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Portable Prototype BAC Device

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Bulkhead Mounted Electronics

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Electronics Production Line

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BAC Device Production Line

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Bryan Preas

  • The one person at PARC with complete mastery of

end-to-end system architecture, design, fabrication and test (FPGA, Embedded Software, GUI, PCB design/layout, PC interface)

  • Incredibly versatile
  • Does whatever it takes
  • Selfless contributor
  • A pleasure to work with
  • Sought after by EVERYONE