W11Physics1CLec27Cfkw

W11Physics1CLec27Cfkw - Physics 1C Lecture 27C Quiz # on...

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Physics 1C Lecture 27C Quiz # on Monday: All of Chapters 26 and 27.
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Resolution If viewed through a slit of width, a , and applying Rayleigh’s criterion, the limiting angle of resolution is: For the images to be resolved, the angle subtended by the two sources at the slit must be greater than θ min . For a circular opening of diameter D :
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Radio Astronomy
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Astronomy through Interferometry All of these use correlated measurements from more than one telescope in order to increase their effective aperture, and thus beat the diffraction limit of the individual telescopes.
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Challenge in Interferometry • The signals from the different telescopes need to be made to interfere with each other. • This requires a measurement of both the phase and amplitude of the incoming signals. • Phase is obtained by timing of peak amplitude. • Synchronized atomic clocks • SufFciently accurate phase measurements can only be done with long wavelength EM waves. • Accordingly, this technique is only used in radiowave astronomy. • The longer the wavelength, the easier it is to measure the phase.
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Crude Beneft Analysis • Fully instrumented (and thus smaller aperture) single telescope allows viewing o± dimmer objects. • Inter±erometry is similar to having a larger instrument but with sparsely instrumented sensitive area. • Better angular resolution • Dim objects can only be resolved at the angular resolution o± the individual telescopes, not the array. • Resolution generally di±±ers ±or di±±erent directions in feld o± view.
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What’s the limit for resolving distant objects via earth based astronomy? A) engineering limit of how small an aperture telescope can be constructed. B) engineering limit of how large an aperture telescope
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W11Physics1CLec27Cfkw - Physics 1C Lecture 27C Quiz # on...

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