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These are but details of the luminaire components. I've used a bit damaged fixture I borrowed from the Technology Networks Brno for a couple of days. Due to a slight deformation of the fixture body the glass did not touch perfectly the felt gasket. Apr 18 18:04, im002119.jpg |
| Apr 18 18:05, im002120.jpg |
| Apr 18 18:06, im002121.jpg |
| Apr 18 18:07, im002122.jpg |
| Apr 18 18:11, im002123.jpg |
| Apr 18 18:12, im002124.jpg |
| Apr 18 18:14, im002125.jpg |
| Apr 18 18:15, im002126.jpg |
| Apr 18 18:15, im002127.jpg |
| Apr 18 18:16, im002128.jpg |
| Apr 18 18:18, im002129.jpg |
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The first series of a start of an HPS lamp begins. The initial spectrum is that of a shining mercury vapour. The images have been taken by a HP315 digital camera through spectral glasses (no glass, just a diffraction grating, a foil with both vertical and horizontal grooves, for more see at the bottom). Apr 18 18:37, im002130.jpg |
| Apr 18 18:37, im002131.jpg |
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It became a low-pressure sodium now. The main yellow-orange line (a doublet of course, but too narrow to see it) becomes prominent, the colours are spoiled by the camera. Apr 18 18:37, im002132.jpg |
| Apr 18 18:38, im002133.jpg |
| Apr 18 18:38, im002134.jpg |
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The pressure rises and the main yellow-orange sodium line is no line anymore, growing thicker due to ``pressure broadening''. Apr 18 18:39, im002135.jpg |
| Apr 18 18:39, im002136.jpg |
| Apr 18 18:39, im002137.jpg |
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An absorption core in the already quite broad main sodium line develops. I suppose that it is produced by a layer of colder sodium vapour along the walls of the corund tube becoming optically thick in spite that it is geometrically very thin. Apr 18 18:40, im002138.jpg |
| Apr 18 18:40, im002139.jpg |
| Apr 18 18:42, im002140.jpg |
| Apr 18 18:51, im002150.jpg |
| Apr 18 18:54, im002151.jpg |
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Another lamp start begins, the first image has been to late to capture the mercury phase. LPS (low-pressure sodium) spectrum is the first one. Apr 18 20:43, im002153.jpg |
| Apr 18 20:44, im002155.jpg |
| Apr 18 20:44, im002156.jpg |
| Apr 18 20:45, im002158.jpg |
| Apr 18 20:47, im002159.jpg |
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This is already a true HPS (high-pressure sodium) spectrum, with the main line being a very broad one, spanning over several fainter lines which remained narrow. The diffraction glasses I've used are sold for fun, but they are excellent for many purposes. They are a lot easier to use than CD to see all types of spectra around us. They can be ordered from Rainbow Symphony or from Edmund Scientifics (search for ``diffraction'') -- another diffraction foils and literature on using them and on spectra in general can be bought from there as well. Apr 18 20:47, im002160.jpg |