Semi-digital programmable correlator, lab testing and - - PowerPoint PPT Presentation

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Semi-digital programmable correlator, lab testing and - - PowerPoint PPT Presentation

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Semi-digital programmable correlator, lab testing and prototyping At the University of Utah, we are working at the development of correlators and prototyping in the laboratory and on the sky with a pair of 3m

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Stephan LeBohec, University of Utah SIIWG Workshop, SLC, Friday January 30th 2009

Semi-digital programmable correlator,

  • lab testing and prototyping

At the University of Utah, we are working at the development

  • f correlators and prototyping in the laboratory and on the

sky with a pair of 3m telescopes. I will present the status of these efforts and our future plans.

  • * Lab setup with analog correlator
  • * Digital correlator
  • * Starbase
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Table top test bench

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Transformer Mixer Transformer Lock-in amplifier (3Hz) Function generator 15Hz Computer Phase switch Phase switch 5v HV 700V Transformer Transformer

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Each measurement corresponds to 50 Each measurement corresponds to 50 readout of the locking amplifier with 3s readout of the locking amplifier with 3s averaging averaging

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Transformer x10 Transformer Mixer 500Ohm Transformer x10 Transformer 500Ohm Lock-in amplifier (3Hz) Function generator 15Hz Computer Phase switch Phase switch 5v HV 700V

Well, maybe not !! Well, maybe not !!

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Semi-digital Semi-digital Correlator Correlator

200MHz digitization prototype

  • (1GHz Already possible)
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Semi-digital Semi-digital Correlator Correlator test test 20MHz sine waves with relative phase 20MHz sine waves with relative phase

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StarBase StarBase:

Two 3m telescopes on a 23m baseline Two 3m telescopes on a 23m baseline

  • at Bonneville

at Bonneville Seabase Seabase, Grantsville Utah , Grantsville Utah

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Possible observations from Possible observations from StarBase StarBase S/N=A S/N=Aαn| n|γ|2(Δf.T/2) f.T/2)1/2

1/2

A=7m2; A=7m2; α=0.3; =0.3; Δf=100MHz =100MHz n=5x10 =5x10-5

  • 5m-1
  • 1s-1
  • 1Hz

Hz-1

  • 1x2.5

x2.5-m

  • m for S/N=5

for S/N=5

Spica
 VERITAS
 STARBASE


0.53mas 0.22mas 1.8mas

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SLIDE 11

Possible observations from Possible observations from StarBase StarBase S/N=A S/N=Aαn| n|γ|2(Δf.T/2) f.T/2)1/2

1/2

A=7m2; A=7m2; α=0.3; =0.3; Δf=100MHz =100MHz n=5x10 =5x10-5

  • 5m-1
  • 1s-1
  • 1Hz

Hz-1

  • 1x2.5

x2.5-m

  • m for S/N=5

for S/N=5

Algol


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Conclusions Conclusions

* Lab tests progressing * Lab tests progressing * Semi-digital * Semi-digital correlator correlator

  • essentially working

essentially working *StarBase StarBase telescopes tracking telescopes tracking

  • in Spring 2009

in Spring 2009 * Secondary optics and * Secondary optics and photodetectors photodetectors

  • Summer 2009

Summer 2009 * Bring your toys to Utah * Bring your toys to Utah * * StarBase StarBase visit Saturday, visit Saturday,

  • meeting at 9:00

meeting at 9:00

  • at the Embassy Suites Hotel

at the Embassy Suites Hotel

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Digital Asynchronous Transceiver (DAT) developed in Leeds for VERITAS

Evolution toward local digitization of the intensity