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Curvature Wavefront Sensor Arbitrary Waveform Generator. Kenyan Kawauchi Subaru Telescope (NAOJ) Mentor: Stephen Colley. Subaru Adaptive Optics. Without AO. With AO. Earth’s atmosphere distorts light. Removes effects of atmospheric distortion. Telescope images blurred.

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curvature wavefront sensor arbitrary waveform generator

Curvature Wavefront Sensor Arbitrary Waveform Generator

Kenyan Kawauchi

Subaru Telescope (NAOJ)

Mentor: Stephen Colley

subaru adaptive optics
Subaru Adaptive Optics

Without AO

With AO

Earth’s atmosphere

distorts light

Removes effects

of atmospheric

distortion

Telescope

images blurred

Image resolution

improved

wavefront sensor
Wavefront Sensor

Visible light reflects

off one side

of membrane

APDs count photons

in each lenslet

Measure light

intensity

Calculate wavefront

phase shift

what vibrates membrane
What vibrates membrane?

Other side of membrane

solution
Solution
  • Design your own AWG!
  • Use DAC40 board
    • Field Programmable Gate Array (FPGA)
    • Digital-to-Analog Converters (DACs)
awg specification
AWG Specification
  • Range of period – 100 Hz to 4 kHz
  • Number of points – 1000
  • Voltage resolution – 14 bits (DAC40 DACs)
  • Update rate for new waveforms – 0.1 seconds (10 Hz)

Voltage Amplitude

Time

logic block diagram
Logic Block Diagram

AWG

Timing

Memory

A

B

design flow
Design Flow

Design Entry

(VHDL)

Compilation

Simulation

Program

Device

simulate design
Simulate Design

Design Entry

(VHDL)

Compilation

Simulation

Program

Device

conclusion
Conclusion

Dual-stroke waveform concept

  • Efficient – Only 1 wavefront sensor
  • Astronomical objects appear 2.5X brighter

In the Future

  • Interface DAC40 to oscilloscope
  • Test AWG
  • Implement in next generation AO system
acknowledgements
Acknowledgements
  • Stephen Colley
  • Olivier Guyon – Subaru Astronomer
  • Hideki Takami – AO Project Manager
  • Subaru Telescope (NAOJ)
  • Center for Adaptive Optics
  • Funding provided through the Center for Adaptive Optics, a National Science Foundation Science and Technology Center (STC), AST-987683