A Short Introduction to Radio Astronomypropagation.ece.gatech.edu › ... ›...
Transcript of A Short Introduction to Radio Astronomypropagation.ece.gatech.edu › ... ›...
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A Short IntroRadio As
dand
ALMA Ob(for Eng
Jua
oduction totronomyththe
servatoryygineers)
an Pablo Caram - [email protected] - 2011School of Electrical and Computer Enginering
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"Radio Astronomy" afrom the stars?
E bj t t t t• Every object at a temperatureelectromagnetic waves.
as in radio waves
b 0 K l i di te above 0 Kelvin radiates
Juan Pablo Caram - 2011School of Electrical and Computer Enginering
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What can we "see" afrequencies?
Ch i l d d• Chemical compounds and rea• Colder (older and further awa• Easier to analyze!Easier to analyze!
at millimeter-wave
tiactionsay) sources
Juan Pablo Caram - 2011School of Electrical and Computer Enginering
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How do we observe • No CCD/CMOS sensors. Wa
lenses.lenses.• Use very directional antenn
broadband receivers.A t A d i t f• Antenna Arrays and interfesensor, but without a lens.
• Need to accurately measureNeed to accurately measure at every antenna.
• Spectral analysis and image
radio sources?avelength are too large. No
nas, and ultra-sensitive ultra-
t Lik ierometry: Like an image
relative phase and amplituderelative phase and amplitude
e synthesis.
Juan Pablo Caram - 2011School of Electrical and Computer Enginering
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The Atacama Large Millimeter/Suub-millimeter Array
Juan Pablo Caram - 2011School of Electrical and Computer Enginering
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Juan Pablo Caram - 2011School of Electrical and Computer Enginering
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Juan Pablo Caram - 2011School of Electrical and Computer Enginering
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A Global Projectj
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Where do we build this thing?
Juan Pablo Caram - 2011School of Electrical and Computer Enginering
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Where do we build this thing?
Juan Pablo Caram - 2011School of Electrical and Computer Enginering
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Where do we build this thing?
Juan Pablo Caram - 2011School of Electrical and Computer Enginering
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Where do we build this thing?
Juan Pablo Caram - 2011School of Electrical and Computer Enginering
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Where do we build this thing?
Juan Pablo Caram - 2011School of Electrical and Computer Enginering
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Basics of ALM& I t f& Interf
MA Electronics f tferometry
Juan Pablo Caram - 2011School of Electrical and Computer Enginering
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Basics of ALM& I t f& Interf
MA Electronics f tferometry
Juan Pablo Caram - 2011School of Electrical and Computer Enginering
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The Arrayy
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Juan Pablo Caram - 2011School of Electrical and Computer Enginering
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Juan Pablo Caram - 2011School of Electrical and Computer Enginering
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Juan Pablo Caram - 2011School of Electrical and Computer Enginering
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Holographyg p y
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Holographyg y
Juan Pablo Caram - 2011School of Electrical and Computer Enginering
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The Reeceiver
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Front End• 1st Down-conversion• 1st LO Synthesis• 1 LO Synthesis
Juan Pablo Caram - 2011School of Electrical and Computer Enginering
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Band Cartridge
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Reference Sign• All reference signals combined and• All reference signals combined and
through 1 single-mode fiber.
nalsd deliveredd delivered
Juan Pablo Caram - 2011School of Electrical and Computer Enginering
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Li L thLine-Lengthh C tih Correction
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Correlator
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Final ProFinal Pro
Power Spectrum Example: First InterferCore (19 January, 2008)
ductsducts
rometric Spectrum at the ATF, Orion Hot
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FinalProducts
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19 Antennas
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Credits: Some material has been taken fPlease visit for furt
from the ALMAObservatory.org website. ther credit details.