ISO-13468-2-1999.pdf
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1、A Reference number ISO 13468-2:1999(E) INTERNATIONAL STANDARD ISO 13468-2 First edition 1999-05-01 Plastics Determination of the total luminous transmittance of transparent materials Part 2: Double-beam instrument Plastiques Dtermination du facteur de transmission du flux lumineux total des matriaux
2、 transparents Partie 2: Instrument double faisceau Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 22:04:11 MDTNo reproduction or networking permitted without license from IHS -,
3、-,- ISO 13468-2:1999(E) ISO 1999 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Org
4、anization for Standardization Case postale 56 CH-1211 Genve 20 Switzerland Internetisoiso.ch Printed in Switzerland ii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Sta
5、ndards is normally carried out through ISO technical committees. Each member body interested 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
6、take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. Draft International Standards adopted
7、 by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 13468-2 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 5,
8、 Physical-chemical properties. ISO 13468 consists of the following parts, under the general title Plastics Determination of the total luminous transmittance of transparent materials: Part 1: Single-beam instrument Part 2: Double-beam instrument Copyright International Organization for Standardizatio
9、n Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 22:04:11 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISOISO 13468-2:1999(E) 1 Plastics Determination of the total luminous transmitt
10、ance of transparent materials Part 2: Double-beam instrument 1 Scope This part of ISO 13468 covers the determination of the total luminous transmittance, in the visible region of the spectrum, of planar transparent and substantially colourless plastics, using a double-beam scanning spectro- photomet
11、er. This part of ISO 13468 cannot be used for plastics which contain fluorescent materials. This part of ISO 13468 is applicable to transparent moulding materials, films and sheets not exceeding 10 mm in thickness. NOTE 1Total luminous transmittance can also be determined by a single-beam instrument
12、 as in part 1 of this International Standard. NOTE 2Substantially colourless plastics include those which are faintly tinted. NOTE 3Specimens more than 10 mm thick may be measured provided the instrument can accommodate them, but the results may not be comparable with those obtained using specimens
13、less than 10 mm thick. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of ISO 13468. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However,
14、 parties to agreements based on this part of ISO 13468 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maint
15、ain registers of currently valid International Standards. ISO 291:1997, Plastics Standard atmospheres for conditioning and testing. ISO 5725-1:1994, Accuracy (trueness and precision) of measurement methods and results Part 1: General principles and definitions. ISO 5725-2:1994, Accuracy (trueness an
16、d precision) of measurement methods and results Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method. ISO 5725-3:1994, Accuracy (trueness and precision) of measurement methods and results Part 3: Intermediate measures of the precision of a
17、standard measurement method. ISO/CIE 10526:1999, CIE standard illuminants for colorimetry. ISO/CIE 10527:1991, CIE standard colorimetric observers. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for R
18、esale, 04/24/2007 22:04:11 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 13468-2:1999(E) ISO 2 CIE Publication No. 15.2:1986, Colorimetry. CIE Publication No. 17.4:1987, International lighting vocabulary also published as IEC 50(845):1987, International electrotechnic
19、al vocabulary Chapter 845: Lighting. 3 Terms and definitions For the purposes of this part of ISO 13468, the terms and definitions given in CIE Publication No. 17.4 for “transparent medium“, “transmittance“, “regular transmittance“, “radiant flux“ and “luminous flux“ apply, together with the followi
20、ng: 3.1 transparent plastics plastics in which the transmission of light is essentially regular and which have a high transmittance in the visible region of the spectrum NOTE Provided their geometrical shape is suitable, objects will be seen distinctly through plastic which is transparent in the vis
21、ible region. 3.2 total spectral transmittance the ratio of the transmitted radiant flux (regular and diffuse) to the incident radiant flux when a parallel beam of monochromatic radiation of a given wavelength passes through a specimen 3.3 total luminous transmittance the ratio of the transmitted lum
22、inous flux to the incident luminous flux when a parallel beam of light passes through a specimen 4 Apparatus 4.1 The apparatus shall consist of the following elements: a stabilized light source; a monochromator; an optical system that forms two parallel beams of monochromatic radiation of equal wave
23、length and approximately equal radiant flux from the output of the monochromator (called the sample and the reference beam); and an integrating sphere fitted with ports and a photodetector. The sample beam enters the sphere through the entrance port. The reference beam enters the sphere through the
24、reference port. The photodetector is mounted on the photodetector port in a manner that allows it to view with equal efficiency all parts of the sphere. Ingress of external light into the integrating sphere shall be prevented. A schematic arrangement of the integrating sphere is shown in Figure 1. 4
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