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Topic: Visual spectrum

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	Spectra
		Together they constitute the "visual spectrum" (or "optical spectrum") because it is the part of the full spectrum that is seen with the human eye.
		The visual spectrum of light, however, is but a tiny portion of the whole picture, of a huge spectrum of radiation that extends in both directions from the edges of the rainbow.
		Visual radiation is in the middle, with wavelengths that extend from 0.00004 centimeters for violet light to about 0.00007 centimeters for extreme red.
	www.astro.uiuc.edu /~kaler/sow/spectra.html (5922 words)

	Optical spectrum - Wikipedia, the free encyclopedia
		The optical spectrum (light or visible spectrum) is the portion of the electromagnetic spectrum that is visible to the human eye.
		Helium was first detected through an analysis of the spectrum of the Sun; chemical elements can be detected in astronomical objects by emission lines and absorption lines; and the shifting of spectral lines can be used to measure the redshift or blueshift of distant or fast-moving objects.
		The first exoplanets to be discovered were found by analysing the doppler shift of stars at such high resolution that variations in their radial velocity as small as a few metres per second could be detected: the presence of planets was revealed by their gravitational influence on the motion of the stars analysed.
	en.wikipedia.org /wiki/Visual_spectrum (646 words)

	Color Vision 1 - photo.net
		The human visual system can detect the range of light spectrum from about 400 nanometers (violet) to about 700 nanometers (red).
		Light at any wavelength in the visual spectrum range from 400 to 700 nanometres will excite one or more of these three types of sensors.
		Our visual system selectively senses the range of light wavelengths that we refer to as the visual spectrum.
	www.photo.net /photo/edscott/vis00010.htm (813 words)

	visual light (Site not responding. Last check: 2007-10-14)
		Visual light is a kind of electromagnetic waves, whose wavelengths are roughly from 380nm to 770nm.
		As a result, the life form on the earth may evolve so as to be sensitive to the visual light.
		The atmosphere is transparent to the visual light with wavelength of 300nm to 1000nm.
	www.shokabo.co.jp /sp_e/optical/spectrum/visual/visual.htm (270 words)

	FAQ9: Why is the visual spectrum continuous if it is produced by electrons going from one quantum state to another ...
		Why is the visual spectrum continuous if it is produced by electrons going from one quantum state to another within the atom?
		The "visual spectrum" is the range of frequencies to which our eyes are sensitive.
		The evolutionary advantage of being able to see, using the spectrum of light coming from the hot sun, determined the fact that our vision is well matched to the range of frequencies in the peak of the thermal spectrum from the sun.
	www2.slac.stanford.edu /vvc/faqs/faq9.html (432 words)

	Optical spectrum : Visual spectrum (Site not responding. Last check: 2007-10-14)
		The optical spectrum (visible spectrum) is the portion of the electromagnetic spectrum that is visible to the human eye (see color for the sequence of colors).
		The term "optical spectrum" originally applied only to that region of the electromagnetic spectrum which is visible to the normal human eye, but is now considered to include all wavelengths between the shortest wavelengths of X-rays and the longest of radio.
		It was Sir Isaac Newton in 1666 who first used the word spectrum to refer to the celebrated Phenomenon of Colours which can be extracted from sunlight, by a glass prism.
	www.explainthis.info /vi/visual-spectrum.html (358 words)

	Winnebago_V5
		Spectrum’s advance booking lets librarians and media center staff (and patrons, if given permission) reserve items for a specified date, ensuring material availability exactly when necessary—especially helpful for planning lessons and special events.
		Visual Search lets users click through a hierarchy of graphical buttons, each representing a single subject—a great search tool for young patrons becoming familiar with the library.
		Spectrum 5 is scheduled for general release in January, 2001, and will be shown at upcoming trade shows.
	www.biblio-tech.com /bTR900/December_2000/winnebago_v5.html (529 words)

	Visual Spectrum - (Site not responding. Last check: 2007-10-14)
		The optical spectrum (light or visible spectrum) is the portion of the electromagnetic spectrum that is visible to the huma
		FAQ9: Why is the visual spectrum continuous if it is produced by electrons going from one quantum state to another...
		The "visual spectrum" is the range of frequencies to which our eyes...
	spectrum.faagr.com /index.php?k=visual-spectrum (960 words)

	How do we sense light?
		We perceive color when the different wavelengths composing white light are selectively interfered with by matter (absorbed, reflected, refracted, scattered, or diffracted) on their way to our eyes, or when a non-white distribution of light has been emitted by some system.
		Visible light is merely a small part of the full electromagnetic spectrum, which extends from cosmic rays at the highest energies down through gamma rays, X- rays, the ultraviolet, the visible, the infrared, and radio waves to induction-heating and electric-power-transmission frequencies at the lowest energies.
		Note that this is the energy per quantum (photon if in the visible range) but not the total energy; the latter is a function of the intensity in a beam.
	webexhibits.org /causesofcolor/1.html (152 words)

	Spectrum Visual
		Spectrum has designed a range of software products built around the distribution, management and playback of digital media.
		The Movie was shot on HDV and encoded at Spectrum in HD for release on the Digital Cinema network installed in Ster Kinekor theatres throughout South Africa.
		One of Spectrum's core strengths is our ability to develop custom software for a variety of uses within the media and entertainment industry; to date our software has been used in a variety of TV shows which have run on SABC, read more...
	www.spectrumvns.com (368 words)

	Strategies for teaching students with vision impairments
		The extent of visual disability depends upon the physical sensory impairment of the student's eyes, the age of the student at the onset of vision impairment, and the way in which that impairment occurred.
		If a student with a visual impairment is in class, routinely check the instructional environment to be sure it is adequate and ready for use.
		A wide selection of magnifying devices are available that can be used by visually impaired students to assist in reading or working with objects that need to be observed.
	www.as.wvu.edu /~scidis/vision.html (2295 words)

	Spectrophotometer with visual spectrum display - Patent 4097152
		The rays of red light at 700 nanometers, the longest wavelength in the visible spectrum, are deviated the most, toward point A. Thus at point A, we find that an image of the filament 2 is formed by the lens 5 at a wavelength of 700 nanometers.
		Thus, photodetector 10 measures the intensity of the light in the lower portion of the spectrum display, which portion is not seen, since it is obscured by opaque mask 12.
		The spectral bandwidth of the measurement is determined primarily by the size of the photodetector and is approximately 20 nanometers.
	www.freepatentsonline.com /4097152.html (1476 words)

	Africa Centre for investment Analysis (Site not responding. Last check: 2007-10-14)
		Spectrum Visual Networks (“SVN”) is a company specialising in managing media networks.
		Spectrum Visual Network Solutions (“SVN”) is a company specialising in managing media networks with a particular focus on digital cinema networks.
		South Africa and Spectrum Visual Networks, along with India, was awarded the 2003 Digital Cinema Country of the Year Award by Screendigest, the world’s leading authority on digital cinema and the cinema industry.
	www.acia.sun.ac.za /projects/SMME/2004/Spectrum.htm (857 words)

	template title
		The sun radiates energy across a very broad "spectrum", whose bounds (both on the high-energy end, and the low relatively) are beyond the capacity of humans to detect, without special tools.
		White light (the full visual spectrum) passing through a prism can be dispersed, disaggregated and spread to reveal its component colors.
		The "Primary" Colors are key components of the visual spectrum, and are more the result of the biology and physiology of the human eye mechanism, than any absolutes in the overall energy spectrum of sunlight.
	ivcusers.ed.uidaho.edu /sgraves/nsta_object/11_review.html (739 words)

	Astron. Astrophys. 347, 942-948 (1999)
		The spectrum reported by Oliva (1998, private communication, see also Reconditi and Oliva, 1993 and Oliva et al., 1996) was taken with a slit, whose width was 1.5 arcsec.
		This average spectrum has been corrected for extinction and normalized in the same way as described in the previous section for the IUE spectrum.
		The corrected, normalized spectrum is given in the last column of Table 6.
	aa.springer.de /papers/9347003/2300942/sc7.htm (384 words)

	The Color Spectrum: How Does It Work?--Physical Science/Mathematics lesson plan (grades 9-12)--DiscoverySchool.com (Site not responding. Last check: 2007-10-14)
		Explain to students that the wavelengths for the visible, infrared, and ultraviolet portions of the spectrum are represented in meters on their data sheets.
		Radar is part of the electromagnetic spectrum, a fundamental element of the universe we live in.
		Context: Visible light is the portion of the electromagnetic spectrum with wavelengths between 400 to 700 nanometers.
	school.discovery.com /lessonplans/programs/colorspectrum (2345 words)

	HyperBook X5000 (Site not responding. Last check: 2007-10-14)
		What we call light is really just a tiny portion of the whole spectrum of radiant energy, which includes radio waves, television waves, and X rays.
		Light is the part of the spectrum that we have receptor systems—our eyes—to detect.
		Reading the colors in the spectrum from right to left gives us the familiar name "ROY G BIV," which is a mnemonic, or memory, device enabling us to remember that the colors of the visual spectrum are
	epsych.msstate.edu /biological/eye/color/color7.html (201 words)

	<<<Spectrum Visual>>>
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	IAEEL NEWSLETTER 2/92 (Site not responding. Last check: 2007-10-14)
		This led the LBL team to propose that a reduction in visual performance caused by reducing light levels could be compensated for by reducing pupil size via shifting the lamp spectral distribution towards a higher scotopic content.
		One visual performance factor that demonstrates the LBL proposition is depth of field, which decreases as pupil size increases.
		Several other initially puzzling findings of the effects of light spectrum on visual tasks and visual clarity that have been reported over the past 20 years can be simply understood by consideration of spectral effects on pupil size and the concept of the pupil lumen.
	www.iaeel.org /IAEEL/NEWSL/1992/tva1992/HumFa_2_92.html (1195 words)

	Colorimetry appendix to PROCESSES IN BIOLOGICAL VISION
		This intent is complicated by the width of the radiometric spectrum.
		Within the spectrum including the infrared and lower frequency regions, the primary characteristic of radiation is the total energy associated with it.
		Further reviewing the Visual Block Diagram of Animal Vision, it is clear that if the adaptation amplifiers of the spectral absorption channels do not change their gain in a proportional manner, the values in the P and Q channels will be changed.
	www.4colorvision.com /colorim.htm (4218 words)

	ASD Info \| Alaska Autism Resource Center (Site not responding. Last check: 2007-10-14)
		Visual Supports – The vast majority of individuals on the spectrum are visual learners (i.e.- they learn what they see not what they hear).
		Children on the spectrum did not appear to be able to acquire communication skills in the same manner as their peers.
		While it may be obvious that children on the lower end of the spectrum, who may be non-verbal, would need communication training it is equally as important for youngsters on the upper end of the spectrum to also receive such training.
	www.sesa.org /aarc/asdinfo/instructional.html (1311 words)

	Colour Rendering of Spectra
		To correctly display the effects of dispersion in refractive media, diffraction, or absorption by nontrivial filters, image synthesis tools must consider the spectrum of the electromagnetic radiation and the spectral dependence of its absorption, reflection, and other interactions with objects; perceptual abstractions such as RGB are inadequate.
		Once the spectrum of the light impinging upon a point in the image plane is known, the eye's perception of that spectrum must be determined.
		The spectrum emitted by an ideal fl body is determined entirely by its temperature; many natural and artificial light sources can be approximated by fl body radiators of various temperatures.
	www.fourmilab.ch /documents/specrend (1596 words)

	vision terms - visual spectrum (Site not responding. Last check: 2007-10-14)
		Rods have a different spectral sensitivity from that of cones, and as a consequence longer wavelengths (reds) tend to look relatively darker at night than during the day, whilst shorter wavelengths (blue) tend to look relatively lighter.
		Other creatures have different ranges which make up their visible spectrum, and butterflies can see into the ultra-violet, whilst some snakes can see in the infra-red.
		The camera output is then viewed on screens that display the image using a portion of the spectrum that is visible to people.
	www-staff.lboro.ac.uk /~huph/vispectr.htm (298 words)

	Chapter 3 - Analysis of the visual signals in Papilio dardanus
		When studying visual signalling and perception in a species it is important to understand what visual signals they may be receiving from each other and from their surroundings in general.
		Thus, for an assessment of the visual signals made by the butterflies to conspecifics and to predators, a quantitative measure of their patterns and coloration is required throughout their visual range (approximately 200-700nm).
		Figure 3-22b shows a typical spectrum obtained in Experiment 3-3 for the white patches in hippocoonides, illustrating the small UV peak at 255nm (the rest of the spectrum being due to pigmental reflection).
	www.alexfreeman.co.uk /thesis/3/3.html (15589 words)

	Professor Joanna McKittrick @ UCSD - Luminescent Inorganic Materials (Site not responding. Last check: 2007-10-14)
		Phosphors that emit light in the visual range of the electromagnetic spectrum are of the most concern for pratical applications, such as televisions and computer monitors.
		Two other important parts of the electromagnetic spectrum are the ultraviolet and infrared wavelengths, which range from ~10 nm to 400 nm and from ~700 nm to around 10,000 nm, respectively.
		The relative sensitivity of the eye to the visual spectrum is shown in Figure 2(b).
	maeweb.ucsd.edu /~mckittrick/projects/luminorganica/luminescent.html (1081 words)

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