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readme 1893 1 10202 document 1893 indexcodes.txt text/plain eebacd3656dc9a276cbdc19859a776f3 MD5 1136 2018-03-27 14:02:47 https://researchdata.gla.ac.uk/577/6/indexcodes.txt 577 6 6 text/plain other Generate index codes conversion from Text to indexcodes en public

indexcodes.txt

http://eprints.org/relation/isVersionOf https://researchdata.gla.ac.uk/id/document/1892 http://eprints.org/relation/isVolatileVersionOf https://researchdata.gla.ac.uk/id/document/1892 http://eprints.org/relation/isIndexCodesVersionOf https://researchdata.gla.ac.uk/id/document/1892 archive 5 disk0/00/00/05/77 2018-03-27 14:05:51 2019-01-23 14:53:33 2018-03-27 14:05:51 data_collection show Gibson Graham 5412 Toninelli Ermes 35232 Horsley Simon A. R. Spalding Gabriel Hendry Euan Phillips David 30394 Padgett Miles 10309 0000-0001-6643-0618 glaresearchdata:2018-01-31-577 pub 30600000 Two zip files: MIC1 and MIC2 are available on request as too large to download The linear Doppler shift is familiar as the rise and fall in pitch of a siren as it passes by. Less well known is the rotational Doppler shift, proportional to the rotation rate between source and receiver, multiplied by the angular momentum carried by the beam. In extreme cases the Doppler shift can be larger than the rest frame frequency and for a red-shift, the observed frequency then becomes 'negative'. In the linear case, this effect is associated with the time reversal of the received signal, but it can only be observed with supersonic relative motion between the source and receiver. However, the rotational case is different, if the radius of rotation is smaller than the wavelength then the velocities required to observe negative frequencies are sub-sonic. Using an acoustic source at ≈100Hz we create a rotational Doppler shift larger than the lab-frame frequency. We observe that once the red-shifted wave passes into the 'negative frequency' regime, the angular momentum associated with the sound is reversed in sign compared to that of the lab-frame. These low velocity laboratory realisations of extreme Doppler shifts have relevance to superoscillatory ï¬elds, and offer new opportunities to probe interactions with rotating bodies and aspects of pseudo relativistic frame translation. 2018-01-31 published University of Glasgow 10.5525/gla.researchdata.577 Image Text 62450 1 TWISTS - Twists & more: the complex shape of light Miles Padgett European Research Council (ERC) 340507 S&E P&A - PHYSICS & ASTRONOMY 63638 1 EPSRC Centre for Doctoral Training in Sensing and Measurement Andrew Harvey Engineering and Physical Sciences Research Council (EPSRC) EP/L016753/1 SCHOOL OF PHYSICS & ASTRONOMY FALSE en 2028-03-27 R FALSE TRUE http://eprints.gla.ac.uk/id/eprint/156548