Re: [Vo]:Modern Measurements of Geothe's dark spectrum
Look at the conclusions of the technical paper https://arxiv.org/abs/1706.09063 Power Area Density in Inverse Spectra --- Conclusions: 1. The existence of the investigated inverse spectral regions ultra-yellow (UY) and infra-cyan (IC) demonstrates empirically that the inverse spectrum is not merely a visual phenomenon but should be seen as the consequence of radiation energy conservation in spectral experiments. 2. If the data of inverse spectra are evaluated in the same way, then a spectrum with only positive spectral components (ordinary spectrum) as well as an inverse spectrum with equal absolute but negative spectral components are obtained, irrespective of the measured radiometric quantities, the spectral range and the illumination used. 3. In the past, the IR range has been explored through temperature measurements. This has recently led to the question of whether “negative temperatures” can be measured in the inverted IR range (Müller 2015). Since the temperature measurement, like the measurement presented here, is based on power densities, this assumption can be confirmed. If temperature is measured in mutually inverse spectra and the measured values are converted into differences to the temperature of the respective backgrounds, a spectrum with only positive values (ordinary spectrum) and a spectrum with only negative values (inverse spectrum) always results. 4. In the field of classical spectroscopic methods, a spectrum cannot be empirically prioritized in favour of its inverse counterpart: they are spectroscopically equivalent and this equivalence is guaranteed by the energy conservation of the radiation in the spectra pair. Harry On Sat, Oct 31, 2020 at 1:30 PM H LV wrote: > > > This paper on the same spectral radiance measurements might be more > appealing for some: > > https://arxiv.org/abs/1706.09063 > > Power Area Density in Inverse Spectra > Matthias Rang, Johannes Grebe-Ellis > Abstract > < and a quantitative description with radiometric units was suggested (Rang > 2015). It could be shown that inverse spectra complement each other > additively to a constant intensity level. Since optical intensity in > radiometric units is a power area density, it can be expected that energy > densities of inverse spectra also fulfill an inversion equation and > complement each other. In this contribution we report findings on a > measurement of the power area density of inverse spectra for the near > ultraviolet, visible and the infrared spectral range. They show the > existence of corresponding spectral regions ultra-yellow (UY) and > infra-cyan (IC) in the inverted spectrum and thereby present additional > experimental evidence for equivalence of inverse spectra beyond the visible > range.>> >
Re: [Vo]:Modern Measurements of Geothe's dark spectrum
sorry, the first link I gave may have an error in it. This works http://www.holisticsciencejournal.co.uk/id/In_dialogue%20Goethes%20Farbenlehre%20Grebe-Ellis%20and%20Passon.pdf Harry On Sat, Oct 31, 2020 at 1:30 PM H LV wrote: > I was beginning to feel like a legend in my own mind, but it seems that in > recent years other people have been making measurements of Goethe`s dark > spectrum with modern instruments. This paper provides some context for > Goethe`s work on colour theory and includes a graph of the spectral > radiance curve of Goethe`s dark spectrum. Roughly speaking Newton`s light > spectrum of blue-green-red emerges from a prism when it is stuck by light > beam within a field of dark, whereas Goethe`s dark spectrum of > yellow-magenta-cyan emerges from a prism when it is struck by a shadow beam > within in a field of light. > > I imagined there must be an infra-cyan and ultra-yellow beyond the visible > part of Geothe`s dark spectrum so I was pleased to see those same terms are > used in this paper. For those people who who turned off by the name of the > journal and think all metaphysical jargon is woo-woo gooble-de-gook, I > suggest you focus on the figures and the data: > > Goethe’s Farbenlehre from the Perspective of Modern Physics > > http://www.holisticsciencejournal.co.uk/id/In_dialogue Goethes > Farbenlehre Grebe-Ellis and Passon.pdf > > The key finding is in the last figure which shows the spectral radiance > curves for both the Newton light spectrum and the Goethe dark spectrum. > Where the Newton spectral radiance curve peaks sharply in the infrared, > there is a correspondingly pronounced dip in the Goethe spectral radiance > curve in the infracyan. > > This paper on the same spectral radiance measurements might be more > appealing for some: > > https://arxiv.org/abs/1706.09063 > > Power Area Density in Inverse Spectra > Matthias Rang, Johannes Grebe-Ellis > Abstract > < and a quantitative description with radiometric units was suggested (Rang > 2015). It could be shown that inverse spectra complement each other > additively to a constant intensity level. Since optical intensity in > radiometric units is a power area density, it can be expected that energy > densities of inverse spectra also fulfill an inversion equation and > complement each other. In this contribution we report findings on a > measurement of the power area density of inverse spectra for the near > ultraviolet, visible and the infrared spectral range. They show the > existence of corresponding spectral regions ultra-yellow (UY) and > infra-cyan (IC) in the inverted spectrum and thereby present additional > experimental evidence for equivalence of inverse spectra beyond the visible > range.>> > > Harry >
