INTERNATIONAL
`STANDARD
`
`ISO
`1944
`
`Secondedition
`1998-06-01
`
`Optics and optical instruments —
`Reference wavelengths
`
`Optique et instruments d'optique — Longueurs d'onde de référence
`
`a|
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`{=
`=“
`——————————
`
`Reference number
`ISO 7944:1998(E)
`
`IMMERVISION Ex. 2015
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`STANDARD
`
`ISO
`1944
`
`Secondedition
`1998-06-01
`
`Optics and optical instruments —
`Reference wavelengths
`
`Optique et instruments d'optique — Longueurs d'onde de référence
`
`a|
`
`|
`{=
`=“
`——————————
`
`Reference number
`ISO 7944:1998(E)
`
`IMMERVISION Ex. 2015
`Licensed to Dave Aikens. ANSI store order # X_666923. Downloaded 08/04/2020. Single userlicense only. Copying and networking LG v. ImmerVision
`IPR2020-00179
`
`1/6
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`ISO 7944:1998(E)
`
`Foreword
`
`ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO
`member bodies). The work of preparing International Standards is normally carried out through ISO technical
`committees. Each memberbodyinterested in a subject for which a technical committee has been established has
`the right to be represented on that committee. International organizations, governmental and non-governmental, in
`liaison with ISO, also take part
`in the work.
`ISO collaborates closely with the International Electrotechnical
`Commission (IEC) on all matters of electrotechnical standardization.
`
`Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
`Publication as an International Standard requires approvalby at least 75 % of the memberbodies casting a vote.
`
`International Standard ISO 7944 was prepared by Technical Committee ISO/TC 172, Optics and optical
`instruments.
`
`This second edition cancels and replacesthefirst edition (ISO 7944:1984), which has been technically revised.
`
`© ISO 1998
`
`All rights reserved. Unless otherwise specified, no part of this publication may be reproducedorutilized in any form or by any means,electronic
`or mechanical, including photocopying and microfilm, without permission in writing from the publisher.
`International Organization for Standardization
`Case postale 56 e CH-1211 Genéve 20 e Switzerland
`Internet
`iso@iso.ch
`Printed in Switzerland
`
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`INTERNATIONAL STANDARD oISO
`
`ISO 7944:1998(E)
`
`Optics and optical instruments — Reference wavelengths
`
`1 Scope
`
`This International Standard specifies two reference wavelengths to be used for the characterization of optical
`materials, optical systems and instruments, as well as ophthalmic lenses.
`It defines the associated principal
`refractive indices and principal dispersions, as well as the Abbe numbers with regard to these reference
`wavelengths andprincipal dispersions.
`
`2 Reference wavelengths, principal dispersions and Abbe numbers
`
`2.1 General
`
`The reference wavelengths are the mercury e-line 546,07 nm (see 2.2) and the helium d-line 587,56 nm (see 2.3).
`
`For non-ophthalmic applications the mercury e-line shall be the reference wavelength.
`
`Other wavelengths which may be usedin addition to these reference wavelengths are givenin tables 1, 2 and 3.
`
`NOTE
`
`Forthe future,it is envisaged that only one reference wavelength is to be specified, even for ophthalmic use.
`
`2.2 Mercury e-line 546,07 nm
`
`The associated principal refractive index nN, is the refractive index at the green mercury e-line and the associated
`principal dispersionis Ne — Ne,
`
`where
`
`Ne
`
`Ne
`
`is the refractive index at the blue cadmium F'-line;
`
`is the refractive index at the red cadmium C'-line.
`
`The Abbe number Vv, with regard to this reference wavelength andthis principal dispersion is defined as:
`
`n, —-1
`Vv, =—*—_
`e
`Ne — Nes
`
`2.3 Helium d-line 587,56 nm
`
`The associated principal refractive index Mg is the refractive index at the yellow helium d-line and the associated
`principal dispersion is Mr — Nc,
`
`where
`
`Ne
`
`is the refractive index at the blue hydrogen F-line;
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`ISO 7944:1998(E)
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`©1SO
`
`No
`
`is the refractive index at the red hydrogenC-line.
`
`The Abbe number Vq with regardto this reference wavelength andthis principal dispersion is defined as:
`
`__ gat
`Vg =
`Ne — Nc
`
`Table 1 — Reference wavelengths and recommended wavelengths
`in the visible and ultraviolet spectral ranges
`
`1) This single line of the Hg-triplet should be used.
`
`Spectral lines|Ultraviolet} Green|YellowViolet Red
`
`
`
`mercury|mercury|mercury|cadmium|hydrogen| mercury|helium|cadmium|hydrogen|helium
`i-line
`h-line
`e-line
`d-line
`r-line
`
`|Etement|Ho|Tvs[vo[cs[|»[w]e|wo|n|
`:
`
`Reference
`546,07|587,56
`wavelength
`nm
`
`Principal
`refractive
`index
`
`Ng
`
`Table 2— Recommended wavelengthsin the infrared spectral range
`[emer[||«|||»|»|w|w|
`Fwasensman|7000|aszaan[rovaaval112560+905[as208|vero|vero.|asnsa|
`1) Caesium s-line
`
`2) Mercury tine
`
`Table 3 — Recommendedlaser wavelengths
`
` mn “ve|smejoe
`
`nm
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`ISO 7944:1998(E)
`
`© ISO
`
`ICS 17.180.01
`
`Descriptors: optics, optical equipment, ophthalmic equipment, optical tests,
`
`testing conditions, reference data, wavelengths.
`
`Price based on 2 pages
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