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GB/T 5137 consists of 5 parts under the general title Test methods of safety glazing materials used on road vehicles:
——Part 1: Mechanical properties tests;
——Part 2: Optical properties tests;
——Part 3: Radiation, high temperature, humidity, fire and simulated weathering resistance tests;
——Part 4: Determination of solar characteristic;
——Part 5: Resistant-to-chemical and resistant-to-temperature changes test.
This is Part 2 of GB/T 5137.
This part is developed in accordance with the rules given in GB/T 1.1-2009.
This part replaces GB/T 5137.2-2002 Test methods of safety glazing materials used on road vehicles—Part 2: Optical properties tests. In addition to editorial changes, the following main technical changes have been made with respect to GB/T 5137.2-2002:
——Clause 2 “Normative references" is added (see Clause 2);
——"Test application conditions" are deleted and "Terms and definitions" are added (see Clause 3 hereof, and Clause 3 of 2002 edition).
——The test purpose of the luminous transmittance test is revised to "determine whether the safety glazing material has a certain regular luminous transmittance". (see 5.1 hereof, and 4.1 of 2002 edition); the requirements of test specimens are added (see 5.2); the requirements of luminous transmittance test for light source are modified (see 5.3.1 hereof, and 4.3.1 of 2002 edition); "Expression of results" and "Alternative methods" are deleted (see 4.5 and 4.6 of 2002 edition).
——The requirements of test specimens are added (see 6.2); the ring target equipment and the requirements for the expression of results in the secondary image deviation test are added (see 6.4.1 and 6.4.2.3); the distance between the observer and the specimen is added (see 6.4.2.2); the expression of results is deleted, and the part related to the test process in the expression of results is incorporated into the “procedure” (see 6.4.2.4 hereof, and 5.4.3 of 2002 edition).
——The clause title of collimating telescope test is modified, and the "test procedure" is changed to "test principle", and “ expressions of results" is changed to "procedure" (see 6.5.2 and 6.5.3 hereof, and 5.5.2 and 5.5.3 of 2002 edition); the orientation of the specimen in the diagram of the collimating telescope test equipment is corrected (see Figure 5 hereof, and Figure 5 of 2002 edition); the method of fast scanning with target light box is changed to optional method (see 6.5.2 and 6.5.3 hereof, and 5.5.2 and 5.5.3 of 2002 edition).
——The limitation of the projector on the light source in the optical distortion test is deleted, and the requirements of the screen are added (see 7.3 hereof, and 6.3 of 2002 edition); the deviation range of R1 and R2 is increased (see 7.4.1); the “expression of results” is deleted, and its contents are incorporated into the “procedure” (see 7.4.4 hereof, and 6.5 of 2002 edition).
——The luminous reflection test is revised, the requirements of test specimens are added, the classification description of apparatus and standard samples is cancelled, the apparatuses are divided into spectrophotometers and photoelectric integral photometers, and the “expression of results” is deleted (see 8.2, 8.3 and 8.4 hereof, and 9.2, 9.3, 9.4 and 9.5 of 2002 edition).
——The visibility test after crushing is deleted (see Clause 7 of 2002 edition).
——The colour recognition test is deleted (see Clause 8 of 2002 edition).
——S(λ)V(λ) at 5 nm interval and 10 nm interval are deleted, and the relative value S(λ)V(λ) at 5 nm interval is retained; the equation is modified and incorporated into 8.4.2 (see Annex C heerof and Annex A of 2002 edition).
This standard has been redrafted and modified in relation to ISO 3538:1997 Road vehicles—Safety glazing materials—Test methods for optical properties.
This part has been changed largely from ISO 3538:1997 in terms of structure. See Annex A for the comparison between this part and ISO 3538:1997 in clause No.
This part includes technical differences with respect to ISO 3538:1997. The clauses and subclauses concerned are identified by a vertical single line (｜) located in the blank on its external margin of the page. These technical changes and reasons are listed in Annex B.
The following editorial changes have been made in this part:
——The standard name is modified.
This part was proposed by the Ministry of Industry and Information Technology of the People's Republic of China.
This part is under the jurisdiction of the National Technical Committee of Auto Standardization (SAC/TC 114).
The previous editions of this part are as follows:
——GB 5137.2-1987, GB/T 5137.2-1996 and GB/T 5137.2-2002.
Test methods of safety glazing materials used on road vehicles—
Part 2: Optical properties tests
1 Scope
This part of GB/T 5137 specifies the methods of luminous transmittance test, secondary image deviation test, optical distortion test and luminous reflection test for safety glazing material used on road vehicles.
This part is applicable to the test of safety glazing materials used on road vehicle.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
QC/T 1119 Road vehicles—Safety glazing materials—Vocabulary (QC/T 1119-2019, ISO 3536:2016, MOD)
3 Terms and definitions
For the purposes of this standard, the terms and definitions given in QC/T 1119 apply.
4 Test conditions
Unless otherwise specified, the tests shall be carried out under the following conditions:
a) Ambient temperature: 20°C±5°C;
b) Atmospheric pressure: 8.60×104 Pa to 1.06×105 Pa;
c) Relative humidity: 40%–80%.
5 Luminous transmittance test
5.1 Test objectives
The purpose of this test is to determine whether the safety glazing material has a certain regular luminous transmittance.
5.2 Test specimens
The product or test piece shall be used, and the test piece can be cut from the corresponding test area on the product. Before the test, the specimen shall be clean and free from dirt and condensation.
5.3 Apparatus
5.3.1 Light source: realizing CIE standard illuminant A, consisting of an incandescent lamp, the filament of which is contained within a parallelepiped 1.5 mm×1.5 mm×3 mm, or with a limited diaphragm. The voltage at the lamp terminals shall be such that the colour temperature is 2 856 K±50 K. The voltage shall be stabilized within ±0.1%.
5.3.2 Optical system (see Figure 1), consisting of two colourless lenses, L1 and L2, each with a focal length, f, of at least 500 mm and corrected for chromatic aberrations. The clear aperture of the lenses shall not exceed f/20. The distance between the lens L1 and the light source shall be adjusted in order to obtain a light beam which is substantially parallel. A diaphragm A1, shall be inserted to limit the diameter of the light beam to 7 mm ± 1 mm. This diaphragm shall be situated at a distance of 100 mm ± 50 mm from the lens L1 on the side remote from the light source. A second diaphragm, A2, shall be placed in front of lens L2 which shall have the same characteristics as L1. The image of the light source shall be centered on the detector. A diaphragm, A3, with a diameter slightly larger than the cross-section of the largest dimension of the image of the light source is placed in front of the detector in order to prevent scattered light created by the sample from reaching the detector. The point of measurement shall be taken at the centre of the light beam.
Key:
1——light source; 5——diaphragm A2;
2——lens L1; 6——lens L2;
3——diaphragm A1; 7——diaphragm A3;
4——specimen; 8——detector;
Figure 1 Schematic diagram of optical system test principle
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5.3.3 Measuring equipment: of which the detector shall have a relative spectral responsivity in substantial agreement with the CIE spectral luminous efficiency function for photopic vision. The sensitive surface of the detector shall be covered with a diffusing medium and shall have at least twice the cross-section of the largest dimension of the image of the light source. If an integrating sphere is used as the detector, the aperture of the sphere shall be at least twice the cross-section of the measuring beam at that aperture.
The linearity of the detector and the associated indicating instrument shall be less than or equal to ±2% of full scale, or ±10% of the magnitude of the reading, whichever is the smaller.
5.4 Procedure
5.4.1 Turn on the power supply of the instrument, and adjust the instrument indicating the response of the detector to indicate 100 divisions when the test specimen is not inserted in the light path. Block the light path and adjust the display value of the detector to zero.
5.4.2 Place the test specimen between the diaphragms A1 and A2 and adjust its orientation in such a way that the angle of incidence of the light beam is equal to 90°±5°.
5.4.3 Measure the regular transmittance of the test specimen: for every point measured, read the number of divisions, n, and keep one decimal place as the result. The regular transmittance τr is equal to n/100.
6 Secondary image separation test
6.1 Test objectives
The purpose of this test is to determine the angular separation between the primary and secondary images.
6.2 Test specimens
The test uses products as specimens.
6.3 Types of test
Two types of test are recognized:
a) target test;
b) collimation telescope test.
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6.4 Target test
6.4.1 Apparatus
The apparatus shall consist of the following items:
a) Light box, approximately 300 mm × 300 mm × 150 mm, the front of which supports the target and is most conveniently constructed from glass masked with opaque black paper or coated with matt black paint. Any one of the targets in Figure 2 may be selected. The box shall be illuminated by a suitable light source. The inside of the box shall be coated with matt white paint.
b) Support stand: place the specimen at the rake angle of the road vehicle, and can rotate and move in the horizontal and vertical directions.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Test conditions
5 Luminous transmittance test
6 Secondary image separation test
7 Optical distortion test
8 Luminous reflection test
Annex A (Informative) Structural changes of this part with reference to ISO 3538:
Annex B (Informative) Technical differences between this part and ISO 3538:1997 and their causes
Annex C (Informative) S(λ)V(λ) value
