1、INTERNATIONAL STANDARD ISO 20508 First edition 2003-12-01 Reference number ISO 20508:2003(E) ISO 2003 Fine ceramics (advanced ceramics, advanced technical ceramics) Determination of light transmittance of ceramic films with transparent substrate Cramiques techniques Dtermination de la transmission d
2、e la lumire des films cramiques avec substrats transparentsISO 20508:2003(E) ii ISO 2003 All rights reserved PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which
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7、20508:2003(E) ISO 2003 All rights reserved iii 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 me
8、mber 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 take part in the work. ISO collaborates closely with the International E
9、lectrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards ad
10、opted 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. Attention is drawn to the possibility that some of the elements of this document may be the subject of pa
11、tent 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 iv INTERNATIONAL STANDARD ISO 20508:2003(E) ISO 2003 All rights reserved 1 Fine ceramics (advanced ceramics, advanced technical cerami
12、cs) 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 visible light transmittance of a transparent coating material, e.g., the transparent electrode for display devices, in which a fine
13、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 translucent medium is not included in this International Standard. 2 Terms and definitions For the purposes of this document, the followi
14、ng 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 flux, expressed as a percentage 2.2 spectral transmittance proportion of incident light which is transmitted through a transparent o
15、r 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 International Standard, is considered to be an air blank 3 Principle of test and measurement This International Standard concerns the
16、measurement of spectral transmittance using a spectrophotometer, employing an air blank as a transmittance reference. The substrate alone shall not be used as the reference. The schematic diagram of the measurement equipment is shown in Figure 1. The transmittance is measured by placing the test pie
17、ce 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 substrate side and thence to the detector. 4 Test environment and test conditions 4.1 Test environment The test shall be carried out at a
18、 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 specific conditions of use specified for the spectrophotometer, they shall be followed. 100 % 100 % 15 C2 7 C3 5 % 85 %ISO 20508:2003(E) 2
19、 ISO 2003 All rights reserved 4.2 Test conditions The test conditions shall be as follows. a) The test-piece shall be placed with its coated face towards the light source and normal to it. NOTE Although in principle the transmittance should not be dependent on the direction of light transmission, th
20、is International Standard unifies the procedure by specifying this condition. The angle tolerance on perpendicularity of the film/substrate to the light 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 refere
21、nce 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 substrate Figure 2 Cross section of installed specimen in light path 1 380 nm 780 nmISO 20508:2003(E) ISO 2003 All rights reserved 3 c) The spectral ban
22、dwidth of sample beam (in Figure 1) shall be smaller than , and with advantage may be smaller than . d) A wavelength scanning speed and spectrophotometer response time shall be selected for which, in accordance with the instruction manual for the instrument, no distortion is produced in the spectrum
23、. 5 Apparatus The measurement shall be based on the use of a spectrophotometer with the following minimum performance and functions. 5.1 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 Wavel
24、ength accuracy, or less; the accuracy shall be calibrated by use of a wavelength standard before the test. 5.1.3 Photometric accuracy, (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
25、periodically. 5.2 Test-piece holder, capable of holding the test-piece with its surface perpendicular to the incident light beam. 6 Certified reference materials 6.1 General The following reference materials shall be used for calibration and checking the performance of the spectrophotometer. 6.2 Wav
26、elength standard A certified optical filter calibrated for wavelength, or a well-established spectral line of the light source shall be 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
27、 a specimen authorized by an official organization such as National Institute of Standards and Technology (NIST) or Japan Quality Assurance 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 piec
28、e 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 no 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
29、light. Dust should be removed by a gentle clean-air jet. Adherent dirt should be removed only by methods agreed upon between relevant parties since damage to the film may result. 10 nm 2nm 0,5 nm 0,5 %ISO 20508:2003(E) 4 ISO 2003 All rights reserved 8 Method Unless otherwise instructed in the recomm
30、ended operational procedure for the spectrophotometer, determine the baseline of the spectrophotometer in the absence 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 t
31、he range to . Unless recently calibrated, insert the cleaned certified wavelength standard into the test-piece holder 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
32、 measure its transmittance spectrum. Digitize the transmittance at the wavelength described in the data table of the transmittance 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
33、 and measure its transmittance spectrum. Digitize the transmittance every over the range to . Normalize the digitized 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 informat
34、ion: a) reference to this International Standard, i.e., determined in accordance with ISO 20508; b) name and address of 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
35、 of the spectrophotometer used, and the certified materials used for wavelength and transmittance standards; e) description 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 780 nm. 5 ISO 20508:2003(E) ICS 81.060.30 Price based on 4 pages ISO 2003 All rights reserved
