curvature wavefront sensor arbitrary waveform generator

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Curvature Wavefront Curvature Wavefront Sensor Arbitrary Sensor Arbitrary Waveform Generator Waveform Generator Kenyan Kawauchi Kenyan Kawauchi Subaru Telescope (NAOJ) Subaru Telescope (NAOJ) Mentor: Stephen Colley Mentor: Stephen Colley

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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. - PowerPoint PPT Presentation

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Page 1: Curvature Wavefront Sensor Arbitrary Waveform Generator

Curvature Wavefront Sensor Curvature Wavefront Sensor Arbitrary Waveform GeneratorArbitrary Waveform Generator

Kenyan KawauchiKenyan Kawauchi

Subaru Telescope (NAOJ)Subaru Telescope (NAOJ)

Mentor: Stephen ColleyMentor: Stephen Colley

Page 2: Curvature Wavefront Sensor Arbitrary Waveform Generator

Subaru Adaptive OpticsSubaru Adaptive Optics

Earth’s atmospheredistorts light

Telescopeimages blurred

Removes effectsof atmospheric

distortion

Image resolutionimproved

Without AO With AO

Page 3: Curvature Wavefront Sensor Arbitrary Waveform Generator

AO System ComponentsAO System Components

Page 4: Curvature Wavefront Sensor Arbitrary Waveform Generator

Wavefront SensorWavefront Sensor

Visible light reflectsoff one sideof membrane

Measure lightintensity

APDs count photonsin each lenslet

Calculate wavefrontphase shift

Page 5: Curvature Wavefront Sensor Arbitrary Waveform Generator

What vibrates membrane?What vibrates membrane?

Other side of membrane

Page 6: Curvature Wavefront Sensor Arbitrary Waveform Generator

ProblemProblem

Page 7: Curvature Wavefront Sensor Arbitrary Waveform Generator

SolutionSolution

• Design your own AWG!

• Use DAC40 board

• Field Programmable Gate Array (FPGA)

• Digital-to-Analog Converters (DACs)

Page 8: Curvature Wavefront Sensor Arbitrary Waveform Generator

AWG SpecificationAWG Specification Range of period – 100 Hz to 4 kHzRange of period – 100 Hz to 4 kHz Number of points – 1000Number of points – 1000 Voltage resolution – 14 bits (DAC40 DACs) Voltage resolution – 14 bits (DAC40 DACs) Update rate for new waveforms – 0.1 seconds Update rate for new waveforms – 0.1 seconds

(10 Hz)(10 Hz)

Voltage Amplitude

Time

Page 9: Curvature Wavefront Sensor Arbitrary Waveform Generator

Logic Block DiagramLogic Block Diagram

AWG

Timing Memory

A B

Page 10: Curvature Wavefront Sensor Arbitrary Waveform Generator

Implement using Quartus IIImplement using Quartus II

Page 11: Curvature Wavefront Sensor Arbitrary Waveform Generator

Design FlowDesign FlowDesign Entry

(VHDL)Compilation Simulation

ProgramDevice

Page 12: Curvature Wavefront Sensor Arbitrary Waveform Generator

Simulate DesignSimulate DesignDesign Entry

(VHDL)Compilation Simulation

ProgramDevice

Page 13: Curvature Wavefront Sensor Arbitrary Waveform Generator

ConclusionConclusion

Dual-stroke waveform conceptDual-stroke waveform conceptEfficient – Only 1 wavefront sensorEfficient – Only 1 wavefront sensorAstronomical objects appear 2.5X brighterAstronomical objects appear 2.5X brighter

In the FutureIn the Future- Interface DAC40 to oscilloscopeInterface DAC40 to oscilloscope- Test AWGTest AWG- Implement in next generation AO systemImplement in next generation AO system

Page 14: Curvature Wavefront Sensor Arbitrary Waveform Generator

AcknowledgementsAcknowledgements

Stephen ColleyStephen ColleyOlivier Guyon – Subaru AstronomerOlivier Guyon – Subaru AstronomerHideki Takami – AO Project ManagerHideki Takami – AO Project ManagerSubaru Telescope (NAOJ)Subaru Telescope (NAOJ)Center for Adaptive OpticsCenter for Adaptive Optics Funding provided through the Center for Adaptive Funding provided through the Center for Adaptive

Optics, a National Science Foundation Science and Optics, a National Science Foundation Science and Technology Center (STC), AST-987683Technology Center (STC), AST-987683