1、_ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising there
2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2012 SAE International All rights reserved. No part of this p
3、ublication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-497
4、0 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/J2134_201212 SURFACE VEHICLE STANDARD J2134 DEC2012 Issued 1995-09 Revised 2012-1
5、2Superseding J2134 JUL2005 Luminous Reflectance in Safety Glazing Materials for Road Vehicles RATIONALE This document was revised in accordance to the harmonization of Z26 and ISO regulations. The test procedure is closely harmonized with a test method, adopted in response to wide demand in the inte
6、rnational community, by the International Organization for Standardization. (See ISO 3538-1997.) This document is similar to ISO 3538, Section 5.5 Luminous reflection test. 1. SCOPE The scope of this SAE Performance Standard is to provide a simple, practical, and broadly applicable test procedure fo
7、r appraising luminous Illuminant A reflectance of reflecting safety glazing materials for road vehicles. This SAE Performance Standard, which provides a simple test procedure widely used in the optics field, may be used to measure the reflectivity which films applied to safety glazing materials for
8、road vehicles may enhance. This test procedure applies to conditions where feasibility, rather than accuracy of measurement, is of prime importance. Measurements can be made outside laboratories in a quality control environment and in similar applications, when glazings, instead of small test specim
9、ens, have to be tested. 2. REFERENCES 2.1 Applicable Documents The following publications form a part of this specification to the extent specified herein. Unless otherwise indicated, the latest issue of SAE publications shall apply. SAE J2134 Revised DEC2012 Page 2 of 42.1.1 ISO Publication Availab
10、le from American National Standards Institute, 25 West 43rd Street, New York, NY 10036-8002, Tel: 212-642-4900, www.ansi.org. ISO 3538-1997 Road vehicles - Glazing materials - Test methods for optical properties, Section 5.5 Luminous reflection test 2.1.2 CIE Publication Available from CIE Central B
11、ureau, Kegelgasse 27, A-1030 Vienna, AUSTRIA CIE Publication 15:2004 Colorimetry, 3rd ed. 3. Definitions For the purpose of this test procedure, the following definitions apply. 3.1 CIE standard Illuminant A A radiant source SA(g79) whose relative spectral radiant power distribution in the visible s
12、pectrum (wavelength range: 380 to 780 nm) corresponds to a black body radiator at 2856 K g114 50 K. 3.2 CIE 1931 standard observer The ideal colorimetric observer with color matching functions x(g79), y(g79), z(g79) corresponding to a field of view subtending a 2-degree angle on the retina is common
13、ly called the “2 degree standard observer.“ 3.3 luminous reflectance The ratio of the reflected luminous flux to the incident luminous flux, either at a specified wavelength of light or for a specified illumination source. 4. Apparatus14.1 primary instrument A highly accurate, integrating sphere, la
14、boratory photometer, or spectrophotometer capable of determining the Illuminant A reflectance of small working standards. 4.2 secondary instrument A less accurate, generally portable, instrument that is capable of determining the Illuminant A reflectance on safety glazing materials by applying the f
15、ormula in Section 7 to this instruments measured values. 4.3 light trap A device that reduces to 1% or less the contribution of reflection from the transmitted source beam to the measured reflectance value. The light trap must also block the ambient transmitted light. 1Since environmental conditions
16、 within the scope of this document render primary instruments impractical, secondary instruments are used to obtain reflectance data comparable to primary instrument data. SAE J2134 Revised DEC2012 Page 3 of 45. Requirements 5.1 The test conditions of temperature, pressure, and humidity must be such
17、 as not to affect the reflectance measurements. 5.2 Stray light must not be a part of the measured specimen reflectance and all measurements should be made with a light trap. 5.3 Primary standards are required to calibrate primary instruments. These are usually highly diffuse reflecting flat tiles w
18、ith reflectance values traceable to an accredited standards supplier. 5.4 The total error of the primary instrument shall be within 1% absolute of the guaranteed primary standard value. 5.5 Secondary standards are required to calibrate secondary instruments. These standards shall be similar to the s
19、afety glazing materials to be measured. Their reflectance values shall have been determined from calibrated primary instruments. 6. Procedure 6.1 Calibrate primary instrument per the instrument manufacturers instructions using a primary standard. 6.2 Measure a secondary standard with this primary in
20、strument and light trap, noting its film side and curvature orientation according to the instrument manufacturers recommendation. Denote this measurement as “B(%)”. 6.3 Calibrate secondary instrument per the instrument manufacturers instructions, using this secondary standard and light trap, noting
21、its film side and curvature orientation. Denote this measurement of the secondary standard as “Cb”. 6.4 Measure the test specimen in the secondary instrument with the specimen and light trap oriented as was the secondary standard during calibration. Measure the reflectance according to the instrumen
22、t manufacturers instructions. Denote this measurement as “Ca”. 6.5 Obtain at least three separate measurements, spanning the flattest area of the test specimen. 7. Calculation of Corrected Illuminant A Reflectance Values 7.1 Calculate corrected Illuminant A reflectance A (%) values from secondary in
23、strument data by using Equation 1: CbCa(%)B(%)A g117g32 (Eq. 1)where: A(%) = Corrected (Illuminant A) secondary instrument specimen value (%) B(%) = Measured (Illuminant A) primary instrument, secondary standard value (%) Ca = Measured (Illuminants A, C, or D) secondary instrument specimen data Cb =
24、 Measured (same illuminant used for Ca) secondary instrument, secondary standard data SAE J2134 Revised DEC2012 Page 4 of 48. Expression of Results 8.1 The reflectance may be determined at any point on the test specimen of safety glazing material that is within the limits of the previous test proced
25、ure. Record the type, construction, and radius of curvature of the specimen, the primary and secondary instruments used, the type and orientation of the primary and secondary standards, the illuminant used to measure Ca and Cb, and the reflectance values of the secondary standard and test specimen.
26、9. Notes 9.1 Marginal Indicia A change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous issue of this document. An (R) symbol to the left of the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only. PREPARED BY THE SAE GLAZING MATERIALS STANDARDS COMMITTEE
