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Stretched Coil Magnetic Field Integral Measurement System Architecture

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Stretched Coil Magnetic Field Integral Measurement System Architecture. Joseph Z. Xu ANL APS CTLS. Argonne National Laboratory. A U.S. Department of Energy Office of Science Laboratory Operated by The University of Chicago. Office of Science. U.S. Department of Energy.

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slide1
Stretched Coil Magnetic Field Integral Measurement System Architecture

Joseph Z. Xu

ANL APS CTLS

Argonne National Laboratory

A U.S. Department of EnergyOffice of Science Laboratory

Operated by The University of Chicago

Office of Science

U.S. Department of Energy

slide2
Key System Requirements
  • Motion Control: SmartMotor via RS-232
    • 8 axis: 2x(0-400mm), 2y(0-400mm), 2z(0-400mm), 2w(0-360)
  • Motion Readout: Linear (x, y, and z) and Rotary (w) Encoders
    • Linear encoder resolutions: 0.5 μm.
    • Rotary encoder resolutions: 36,000 step/revolution.
    • Linear stage speed: up to 50 mm/s
    • Rotary stage speed: up to 1 revolution/second.
    • Δx, Δy, Δz, Δw (in steps).
  • DAQ: Coil EM Voltage Measurement
    • Resolution: 16 bit (5 digits).
    • Sampling rate: 1.5 kS/s.
  • Synchronization: Absolute Position vs. Voltage Measurement w/ 16 bit resolution, at 1.5 kS/s.
  • Digital I/O Noise Control: 10-7
slide3
To the SmartMotors

From the Coil

RS-485

PowerDAQ 16 bit

PCI ADC Card

RS-232

RS-232 to

RS-485 Converter

Amplifier

Current System Architecture

  • Current Issues:
  • Positioning and measurements are “synchronized” by PC CPU time using software. (~ 3 ms)
  • Start and Finish positions/times are not well defined.
slide4
Proposed System Architecture

From x, y, z, and w

encoders

From Start/end

position Optical Sensor

From the Coil

PXI

FPGA I/O

with built in

16 bit ADC

TCP/IP

Amplifier

RS-232

To Stage Servo Motors

  • Key Features:
  • Integrated real time encoder readout, triggering, and Coil EM voltage measurement.
  • TCP/IP Interface, can be accessed remotely from anywhere, anytime, wired or wirelessly.
  • Commercial off-the-shelf product.
  • Same hardware/software can be re-used for the “Hall Probe Measurement” setup.
  • Drawbacks:
  • Extra DAQ and Encoder hardware.
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