User talk:Onedrey
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IPPOLIT
[edit]Hello Onedrey, thanks for your contribution to the IPPOLIT article! Please do also leave a note in the discussion on deletion. Galaxy07 (talk) 00:49, 9 January 2010 (UTC)
Michelson and Morley (1887) and other early experimentalists using interferometric techniques in an attempt to measure the properties of the luminiferous aether, used monochromatic light only for initially setting up their equipment, always switching to white light for the actual measurements. The reason is that measurements were recorded visually. Monochromatic light would result in a uniform fringe pattern, and since the fringes would frequently disappear due to vibrations by passing horse traffic, distant thunderstorms and the like, it would be easy to "get lost" when the fringes returned to visibility. The advantages of white light, which produced a distinctive colored fringe pattern, far outweighed the difficulties of aligning the apparatus due to its low coherence length. This was an early example of the use of white light to resolve what is known as the "2 pi ambiguity". Stigmatella aurantiaca (talk) 14:38, 30 April 2012 (UTC)
It seems impossible for me. They were seeking "aether wind". And if there was aether, optical paths of two pencils of light through aether would be rather different, so, there would be no interference in white light. In addition, the displacement of the interference fringes in white light would produce "rainbow" effect, in which colors in interference picture would replace each other, making unclear, where to point the cross wire of the micrometer (in case of monochromatic fringe that's clear, just the center of fringe). I don't think the monochromatic light would disappear because of little vibrations, the width of light pencil compensate it. Very little disturbance should produce just displacement of fringes. Also, in all formulas they used wavelength of yellow light. Have you any source that points on using of white light during experiment. In original work they say they use white light in preparation, for annulling the difference in the lengths of paths, not during experiment. Yellow light seems absolutely useless for preparation Sorry for bad English. Onedrey (talk) 15:17, 30 April 2012 (UTC)
I've added a citation to Michelson's 1881 paper and a quote from that paper. Read the quote. Yellow sodium light easily produced fringes, so was used while setting up the apparatus; then they switched back to the argand lamp. Stigmatella aurantiaca (talk) 15:25, 30 April 2012 (UTC)
Hmmm... And why they always use yellow wavelength in calculations? It should be green if they take the middle of spectrum Onedrey (talk) 16:10, 30 April 2012 (UTC)