1、BRITISH STANDARD BS ISO 20508:2003 Fine ceramics (advanced ceramics, advanced technical ceramics) Determination of light transmittance of ceramic films with transparent substrate ICS 81.060.30 BS ISO 20508:2003 This British Standard was published under the authority of the Standards Policy and Strat
2、egy Committee on 13 February 2004 BSI 13 February 2004 ISBN 0 580 43442 7 National foreword This British Standard reproduces verbatim ISO 20508:2003 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee RPI/13, Advanced technical
3、ceramics, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the sec
4、tion entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.
5、Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor re
6、lated international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii and iii, a blank page, pages 1 to 4, an inside back cover and a back cover. The BSI copyright notice displayed in t
7、his document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsINTERNATIONAL STANDARD ISO 20508 First edition 2003-12-01 Reference number ISO 20508:2003(E) Fine ceramics (advanced ceramics, advanced technical ceramics) Determination of light trans
8、mittance of ceramic films with transparent substrate Cramiques techniques Dtermination de la transmission de la lumire des films cramiques avec substrats transparentsBSISO20508:2003ISO :80502(3002)E ii ISO 3002 All rithgs reresvde id FDPscalimer ThFDP si fam eliy ctnome niat deddebyepfa.sec In cacna
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13、eneva 02 T.le 22 14 + 10 947 11 Fxa + 22 14 0 94774 9 Eam-il ocpyrithgios.ogr Web wwwi.soo.rg BSISO20508:2003ISO 05023002:8)E( ISO 3002 r llAithgs reservde iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies)
14、. The work of preparing International Standards 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
15、-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. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part
16、 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted 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
17、a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 20508 was prepared by Technical Committee ISO/TC 206, Fine ceramics. BSISO20508:2003. vi
18、ANRETNIITOTS LANDNADRA ISO 05023002:8)E( ISO 3002 r llAithgs reservde 1 Fine ceramics (advanced ceramics, advanced technical ceramics) Determination of light transmittance of ceramic films with transparent substrate 1S c o p e This International Standard specifies a test method for determining the v
19、isible light transmittance of a transparent coating material, e.g., the transparent electrode for display devices, in which a fine ceramic thin film is coated on to a substrate. This International Standard is not applicable to deliberately coloured, uneven or non-parallel faced test pieces. A transl
20、ucent medium is not included in this International Standard. 2 Terms and definitions For the purposes of this document, the following terms and definitions apply. 2.1 transmittance proportion of incident light which is transmitted through a transparent or semi-transparent body for a given luminous f
21、lux, expressed as a percentage 2.2 spectral transmittance proportion of incident light which is transmitted through a transparent or semi-transparent body for a given monochromatic wavelength, expressed as a percentage 2.3 reference means of providing transmittance that, for the purposes of this Int
22、ernational Standard, is considered to be an air blank 3 Principle of test and measurement This International Standard concerns the measurement of spectral transmittance using a spectrophotometer, employing an air blank as a transmittance reference. The substrate alone shall not be used as the refere
23、nce. The schematic diagram of the measurement equipment is shown in Figure 1. The transmittance is measured by placing the test piece perpendicular to the light beam as indicated in Figure 2 so that the beam is incident perpendicularly on the film side of the test piece and transmitted to the substr
24、ate side and thence to the detector. 4 Test environment and test conditions 4.1 Test environment The test shall be carried out at a temperature between and and in an environment of between and humidity and which is free from mechanical vibrations that may affect the measurement. If there are specifi
25、c conditions of use specified for the spectrophotometer, they shall be followed. 100 % 100 % 15 C2 7 C3 5 % 85 % BSISO20508:20031ISO :80502(3002)E 2 ISO 3002 All rithgs reresvde 4.2 Test conditions The test conditions shall be as follows. a) The test-piece shall be placed with its coated face toward
26、s the light source and normal to it. NOTE Although in principle the transmittance should not be dependent on the direction of light transmission, this International Standard unifies the procedure by specifying this condition. The angle tolerance on perpendicularity of the film/substrate to the light
27、 beam is . b) The range of wavelength to be used for measurement shall be to . Key 1 light source 2 monochromator 3 sector or beam splitter 4 reference beam 5 sample beam 6 detector 7 sample 8 sample compartment Figure 1 Schematic diagram of spectrophotometer Key 1 light beam 2t h i n f i l m 3 subs
28、trate Figure 2 Cross section of installed specimen in light path 1 380 nm 780 nm BSISO20508:20032ISO 05023002:8)E( ISO 3002 r llAithgs reservde 3 c) The spectral bandwidth of sample beam (in Figure 1) shall be smaller than , and with advantage may be smaller than . d) A wavelength scanning speed and
29、 spectrophotometer response time shall be selected for which, in accordance with the instruction manual for the instrument, no distortion is produced in the spectrum. 5 Apparatus The measurement shall be based on the use of a spectrophotometer with the following minimum performance and functions. 5.
30、1 Spectrophotometer, with the following performance specifications: 5.1.1 Wavelength range, capable of operating over at least the range given in 4.2 b). 5.1.2 Wavelength accuracy, or less; the accuracy shall be calibrated by use of a wavelength standard before the test. 5.1.3 Photometric accuracy,
31、(of the transmittance measurement) or less; the accuracy shall be checked by use of one or more certified transmittance standards (see Clause 6) before the test, or periodically. 5.2 Test-piece holder, capable of holding the test-piece with its surface perpendicular to the incident light beam. 6 Cer
32、tified reference materials 6.1 General The following reference materials shall be used for calibration and checking the performance of the spectrophotometer. 6.2 Wavelength standard A certified optical filter calibrated for wavelength, or a well-established spectral line of the light source shall be
33、 used. 6.3 Transmittance standard A certified optical filter with defined transmittance as a function of wavelength shall be used. NOTE The transmittance standard is a specimen authorized by an official organization such as National Institute of Standards and Technology (NIST) or Japan Quality Assur
34、ance Organization (JQA). 7T e s t - p i e c e The test-piece shall comprise a fine ceramic thin film coated on to the surface of a substrate such as glass, or a piece cut from such an item. The test-piece is wide enough for the luminous flux. The measurement is carried out on a test-piece to which n
35、o dust is adherent. NOTE Dust and other dirt adhering to either face of the test-piece or reference standards can influence the transmittance spectrum by scattering light. Dust should be removed by a gentle clean-air jet. Adherent dirt should be removed only by methods agreed upon between relevant p
36、arties since damage to the film may result. 10 nm 2nm 0,5 nm 0,5 % BSISO20508:20033ISO :80502(3002)E 4 ISO 3002 All rithgs reresvde 8 Method Unless otherwise instructed in the recommended operational procedure for the spectrophotometer, determine the baseline of the spectrophotometer in the absence
37、of a test-piece or reference to obtain the transmittance in accordance with the conditions given in 4.1 and over the wavelength range given in 4.2 b). Digitize the curve every over the range to . Unless recently calibrated, insert the cleaned certified wavelength standard into the test-piece holder
38、and measure the transmittance spectrum. Check that the certified wavelength values are obtained to within . Insert the certified transmittance standard into the test-piece holder and measure its transmittance spectrum. Digitize the transmittance at the wavelength described in the data table of the t
39、ransmittance standard over the range to . Check that the measured transmittance is in agreement with the certified values to within . Insert the test piece into the test-piece holder and measure its transmittance spectrum. Digitize the transmittance every over the range to . Normalize the digitized
40、transmittance spectrum by the air blank to give the test-piece transmittance, and express as a percentage. 9 Test report The test report shall contain at least the following information: a) reference to this International Standard, i.e., determined in accordance with ISO 20508; b) name and address o
41、f the testing establishment; c) date of the test, a unique identification of the report and of each page, the customers name and address and a signatory to the report; d) description of the spectrophotometer used, and the certified materials used for wavelength and transmittance standards; e) descri
42、ption of the test-piece and its identity; f) test conditions used, including wavelength range, spectral bandwidth and wavelength scanning speed; g) original spectrum and the digitized transmittance spectrum, expressed as a percentage. 100 % 10 nm 380 nm 780 nm 0,5 nm 380 nm 780 nm 1% 10 nm 380 nm 78
43、0 nm BSISO20508:20034. 5 BS ISO 20508:2003 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by
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