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Topic: Abbe number

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Crown glass

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Power number

Dimensionless number

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Rayleigh number

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Aberration in optical systems

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	Abbe number - Wikipedia, the free encyclopedia
		In physics and optics, the Abbe number, also known as the V-number or constringence of a transparent material is a measure of the material's dispersion (variation of refractive index with wavelength).
		Abbe numbers are only a useful measure of dispersion for visible light, and for other wavelengths, or for higher precision work, the group velocity dispersion is used.
		Abbe numbers are used to calculate the necessary focal lengths of achromatic doublet lenses to minimize chromatic aberration.
	en.wikipedia.org /wiki/Abbe_number (272 words)

	Ernst Abbe - Wikipedia, the free encyclopedia
		Ernst Karl Abbe (January 23, 1840 in Eisenach – January 14, 1905 in Jena), was a German physicist.
		Abbe is best known for his work in optics; however, during his association with Carl Zeiss' microscope works, in Jena, he introduced the eight-hour workday, in remembrance of the 14-hour workday of his own father.
		The eight-hour workday would not be widely emulated in the United States until its use in the next century by the Ford Motor Company 1914, although it was proclaimed in 1884.
	en.wikipedia.org /wiki/Ernst_Abbe (118 words)

	[No title]
		JOHN2 ABBE, son of John1 and Mary () Abbe, born in 1636 or 1637, probably in Salem, Mass., died suddenly, December 11, 1700, in Windham, Conn. As early as 1663, he was one of three to oversee the Town's Common and to resist encroachments on the timber.
		To Thomas Abbe 35 acres Meadow 4 acres and a homelot of 11 acres.
		Adonijah Montague of Pawlet, Vt. Abigail Abbe, b.Oct. 25, 1709.
	www.fortunecity.com /millenium/sat/426/ged/docs/abbe.txt (13542 words)

	Dimensionless number - Wikipedia, the free encyclopedia
		In dimensional analysis, a dimensionless number (or more precisely, a number with the dimensions of 1) is a pure number without any physical units.
		Such a number is typically defined as a product or ratio of quantities which have units of identical dimension, in such a way that the corresponding units can be converted to identical units and then cancel.
		Dimensionless numbers are widely used in the fields of mathematics, physics, and engineering but also in everyday life.
	www.wikipedia.org /wiki/Dimensionless_Number (1040 words)

	IMT - Applied Optics - achromat demonstration
		For such purpose, one lens is made in a crown glass (low dispersion, i.e.
		Abbe number above 50), while the other is made of a flinte glass (high dispersion, i.e.
		The crown lens concentrate on the optical effect (for example focusing) and introduces some dispersion, and the second lens aims at balancing this dispersion while having the least possible optical influence on the lens function.
	www-optics.unine.ch /education/optics_tutorials/achromat.html (337 words)

	Optical sciences technical definitions : abbe number, abbe value, pupillarity distance, refractive index, specific ...
		The Abbe number or constant of a lens is the reciprocal of the V value, or dispersive power.
		The number usually ranges between 20 and 60 and higher number have less chromatic dispersion than material with lower Abbe numbers.
		Abbe numbers for ophthalmic lens materials range between 60 and 30.
	www.essilor.com.my /Professional/Encyclo/technicwords/technicwords.htm (729 words)

	Lens Materials (Site not responding. Last check: 2007-10-20)
		number of factors should be considered when determining which lens material will work best for the patient.
		- The Abbe number of a lens material is the reciprocal of the medium's V value, or dispersive power, usually ranging between 20 and 60.
		The higher the number in the prescription, the stronger that prescription is, and the more the light must be bent in order to correct your vision.
	www.newmanblackstock.com /lens_materials.html (1365 words)

	Encyclopedia: Abbe-number (Site not responding. Last check: 2007-10-20)
		In optics, dispersion is a phenomenon that causes the separation of a wave into spectral components with different frequencies, due to a dependence of the waves speed on its frequency.
		Ernst Karl Abbe Ernst Karl Abbe (January 23, 1840 in Eisenach â€“ January 14, 1905 in Jena), was a German physicist.
		Dimensionless numbers In optics, an Abbe prism, named for its inventor, the German physicist Ernst Abbe, is a type of constant deviation dispersive prism similar to a Pellin_Broca prism.
	www.nationmaster.com /encyclopedia/Abbe_number (504 words)

	Canon UK - Glossary Film Cameras
		The Abbe number is determined by the following formula using the index of refraction for three Fraunhofer's lines: F (blue), d (yellow) and c (red).
		An optical glass characteristic distribution chart is a graph using the Abbe number as the horizontal axis and the d line index of refraction as the vertical axis.
		The brightness of a lens is determined by the F number, but this value only indicates the brightness at the optical axis position, i.e., at the center of the image.
	www.canon.co.uk /For_Home/Product_Finder/Cameras/filmcam_glossary.asp?ComponentID=28033&SourcePageID=26324 (8898 words)

	United States Patent Application: 0040092378
		A lead-free optical glass having a refractive index n.sub.d of 1.55.ltoreq.n.sub.d.ltoreq.1.60, an Abbe number v.sub.d of 54.ltoreq.v.sub.d.ltoreq.63 and a transformation temperature Tg.ltoreq.500.degree.
		A lead-free optical glass having a refractive index n.sub.d of 1.56.ltoreq.n.sub.d.ltoreq.1.59, an Abbe number v.sub.d of 55.ltoreq.v.sub.d.ltoreq.62 and a transformation temperature Tg.ltoreq.500.degree.
		However, compared to gob spraying, the reduced number of cycles and pieces and, with small geometry, the added value cannot be derived from the value of the material alone.
	appft1.uspto.gov /netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=/netahtml/PTO/srchnum.html&r=1&f=G&l=50&s1="20040092378".PGNR.&OS=DN/20040092378&RS=DN/20040092378 (4124 words)

	Ernst Abbe (Site not responding. Last check: 2007-10-20)
		Abbe is best known for his work optics ; however during his association with Carl Zeiss ' microscope works in Jena he introduced the eight-hour workday in remembrance of the 14-hour workday his own father.
		The eight-hour workday would be widely emulated in the United States until its use in the next by the Ford Motor Company 1914 although it was proclaimed in 1884.
		Ernst Abbe (Biographien hervorragender Naturwissenschaftler, Techniker und Mediziner)
	www.freeglossary.com /Ernst_Abbe (155 words)

	The EyeCare Connection
		The Abbe number represents the relative degree of distortion generated while looking through off-center areas of the lens.
		Generally, the higher the index of refraction, the lower the Abbe, but this is not a linear proportion.
		Abbe of 30 is considered to have a high potential aberration and Abbe of 60 is considered the most minimal distortion for consumer level lenses.
	www.eyecarecontacts.com /thin_light_lenses.html (911 words)

	SPIE - Web Cast - Education (Site not responding. Last check: 2007-10-20)
		A material with a high Abbe number means that different wavelengths will have nearly the same index of refraction in that medium, yielding less separation between wavelengths of light.
		The number of cavities determines the overall shape of the transmittance curve.
		60-40), the first number is referred to as the scratch number and quantifies defects of a long nature, such as scratches, while the second number indicates round defects such as digs and is referred to the dig number.
	spie.ndgo.net /aud/glossary2.asp (10547 words)

	High index/high Abbe number composition US Patent 5977276 (Site not responding. Last check: 2007-10-20)
		By the term "Abbe number", as used herein, we mean the number expressing the extent to which the shorter and longer wavelengths of light are separated by refraction through a lens, that is the amount the lens disperses the various colours.
		By the term "high Abbe number" as used herein, we mean a polymer having an Abbe number of at least approximately 35, preferably 38 or above.
		A satisfactory lens having a high Abbe number of 42 and high refractive index was formed.
	patents.nimblewisdom.com /patent/5977276-High-index-high-Abbe-number-composition (3593 words)

	Lens Materials
		It's Abbe value is 32, This lens is about 25% thinner than CR-39 and blocks approximately 18% of UV light.
		Its Abbe number is 58, close enough to crown not to matter.
		The patient must be made aware of the fact that this is a softer lens and scratching may occur even though it has a factory scratch coating.
	www.nfos.org /degree/opt21/module_06.html (1275 words)

	Optical and ophthalmic glass with refractive indices greater than or equal to 1.56, Abbe numbers greater than or equal ...
		In addition to the main properties of high refractive index and high Abbe number at low density, optimal, ophthalmic glass must have further important properties in order to be useful as glass for spectacle lenses.
		In the glasses according to this invention are combined the fulfillment of the demand for high refractive index and high Abbe number at lowest density, as well as excellent crystallization behavior, chemical hardenability, chemical stability and a sharp UV absorption limit at 340-390 nm.
		The high Abbe number demanded in DEOS 31 39 212 is not really necessary since the color fringes occur in spectacle lenses upwards of a v.sub.d less than 42 and may disturb the wearer of the spectacles.
	xrint.com /patents/us/4562161 (2186 words)

	Abbe
		Fiske left the town in 1655 followed by a number of the church, and in 1657 Mr.
		Samuel Abbe son of John (2) Abbe, born probably at Wenham, Mass., about 1646 or soon after his father's settlement there; died in Windham, Conn., March, 1697/8.
		She vowed vengence upon them and when several of their cows and hogs were taken sick, the blame was laid to her as a witch.
	members.aol.com /ggilb10335/Abbe.html (3776 words)

	The Spectacle Shoppe, Inc. (Optical Goods Retail) (Site not responding. Last check: 2007-10-20)
		It is a measure of the degree to which light is dispersed or separated when entering a lens.
		If the Abbe value is too low, then the light dispersion will cause chromatic aberration which appears in one's vision to be like a rainbow around viewed objects especially noticed around light sources.
		The lower the Abbe value, the more chromatic aberration will be a characteristic of that lens.
	www.krspecs.com /abbe.html (245 words)

	Optical lens in transparent organic polymer material with high refractive index and high Abbe number - US Patent 6533815 (Site not responding. Last check: 2007-10-20)
		Ophthalmic lens according to claim 1, wherein the monomer with a high Abbe number represents 10 to 70% by weight with respect to the total weight of monomers present in the composition.
		Preferably again, a monomer with a high Abbe number is chosen, the refractive index of which is at least 1.56.
		The refractive index at 21° C., the Abbe number, the relative density at 21° C. the glass transition temperature, the suitability for colouring and the odour were determined with regard to these lenses.
	www.patentstorm.us /patents/6533815.html (3865 words)

	Abbe number -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-20)
		Named for (Click link for more info and facts about Ernst Abbe) Ernst Abbe (1840-1905), German physicist.
		Abbe numbers are used to classify (A brittle transparent solid with irregular atomic structure) glasses.
		Abbe numbers are only a useful measure of dispersion for visible light, and for other wavelengths, or for higher precision work, the (Click link for more info and facts about group velocity dispersion) group velocity dispersion is used.
	www.absoluteastronomy.com /encyclopedia/A/Ab/Abbe_number.htm (144 words)

	Auckland Astronomical Society
		To do this it must meet what is known as the achromatic condition, which is a simple ratio between the Abbe number of the glass used and the focal lengths of the two lenses.
		Abbe number An index number of a particular glass which allows the glass to be designed as an achromat.
		Flint Glass Flint glass is a general name for glass with a high refractive index and a low Abbe number.
	www.astronomy.org.nz /aas/Journal/RefractorTelescopes.asp (1661 words)

	Wavelength Optical Newsletter June 2000 (Site not responding. Last check: 2007-10-20)
		The Abbe number appears to have developed an almost mystical quality, unequaled by other lens characteristics, As a result, some materials, notably polycarbonate and, to a much lesser degree (oddly) 1.600 and 1.670 index plastics, have been roundly criticised by many practitioners, solely on the basis of a low Abbe number.
		While the Abbe number is a very important figure for camera and instrument designers, it is of little value in ophthalmic optics unless we can measure its effects.
		With regard to the effects of chromatism, as measured by the Abbe number, the studies quoted by Torgersen found that transverse chromatic aberration (TCA) of 0.16 causes a one-line drop in acuity, measured on the Snellen chart (a drop in V/A from 6/6 to 6/7.5).
	www.oten.edu.au /oten/wavelength/35.html (3024 words)

	Profotos - Photo Glossary (A-B) (Site not responding. Last check: 2007-10-20)
		•Abbe number - denotes the degree of refraction of light of different wavelengths to different extents, given by a transparent material, such as glass.
		The lower the Abbe number, the greater the dispersion of colors.
		The system standard requires the printing of frame number, film cassette number and processing date automatically on the back of each Advanced Photo System print.
	www.profotos.com /education/referencedesk/glossary/index.shtml (3698 words)

	Abbe number (Site not responding. Last check: 2007-10-20)
		In physics and optics the Abbe number also known as the V-number or constringence of a transparent material is a of the material's dispersion (variation of refractive index with wavelength).
		Named for Ernst Abbe (1840 - 1905) German physicist.
		Abbe numbers are only a measure of dispersion for visible light and other wavelengths or for higher precision work group velocity dispersion is used.
	www.freeglossary.com /Abbe_number (274 words)

	G-S Plastic Optics - Custom Optics (Site not responding. Last check: 2007-10-20)
		It has an index @588nm of 1.49, and an Abbe number of 55.3.
		Acrylic is also known for its very good clarity and excellent transmission properties throughout the visible portion of the spectrum.
		Polycarbonate is similar to polystyrene in index (@588nm, 1.586) and Abbe number (29.9).
	www.gsoptics.com /custom_optics (895 words)

	Abbe Refractometers (Site not responding. Last check: 2007-10-20)
		Refractive index or Abbe number (v d or v e) can be measured at different wavelengths ranging from 450 to 1,100nm.
		The DR-M2 digitally displays measurement result of refractive index or Abbe number on the LCD.
		The instrument calculates the dispersion value or ABBE number (nD@589-1/nF-nC).
	www.rlinstruments.com /prod02.htm (518 words)

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