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GB/T 5137.2-2020 English PDF (GBT5137.2-2020)

GB/T 5137.2-2020 English PDF (GBT5137.2-2020)

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GB/T 5137.2-2020: Test methods of safety glazing materials used on road vehicles -- Part 2: Optical properties tests

This Part of GB/T 5137 specifies the methods for visible light transmittance test, secondary image separation test, optical distortion test, and visible light reflectance test of safety glazing materials used on road vehicles. This Part applies to the tests of safety glazing materials used on road vehicles.
GB/T 5137.2-2020
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 43.040.60
T 34
Replacing GB/T 5137.2-2002
Test methods of safety glazing materials used on road
vehicles - Part 2: Optical properties tests
(ISO 3538:1997, Road vehicles - Safety glazing materials -
Test methods for optical properties, MOD)
ISSUED ON: MARCH 31, 2020
IMPLEMENTED ON: FEBRUARY 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 6
4 Test conditions ... 6
5 Visible light transmittance test ... 6
6 Secondary image separation test ... 8
7 Optical distortion test ... 14
8 Visible light reflectance test ... 19
Annex A (Informative) Structural changes of this Part compared with ISO 3538:1997 ... 21
Annex B (Informative) Technical differences between this Part and ISO
3538:1997 and their causes ... 24
Annex C (Informative) S(??)V(??) values ... 27
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 for visible light transmittance test, secondary image separation test, optical distortion test, and visible light reflectance test of safety glazing materials used on road vehicles.
This Part applies to the tests of safety glazing materials used on road vehicles. 2 Normative references
The following documents are indispensable for the application of this document. For the dated references, only the editions with the dates indicated are applicable to this document. For the undated references, the latest edition (including all the amendments) are applicable to this document.
QC/T 1119 Road vehicles - Glazing materials - Terminology (QC/T 1119-
2019, ISO 3536:2016, MOD)
3 Terms and definitions
For the purposes of this document, 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 ambient conditions:
a) Ambient temperature: 20 ??C??5 ??C;
b) Atmospheric pressure: 8.60??104 Pa~1.06??105 Pa;
c) Relative humidity: 40%~80%.
5 Visible light transmittance test
5.1 Test purpose
Determine whether the safety glazing material has a certain regular
transmittance.
5.2 Sample
It shall use the product or test piece. The test piece can be cut from the corresponding test area on the product. Before the test, the sample shall be clean and free of dirt and condensation.
5.3 Test apparatus
5.3.1 Light source: Tungsten lamp. Its filament is in a parallel hexahedron of 1.5 mm??1.5 mm??3 mm; or a defining diaphragm is added. The spectral distribution of the light source shall conform to the relative spectral power distribution of CIE standard illuminant A. The voltage applied to the two ends of the filament shall make the color temperature 2856 K??50 K. The voltage shall be stable within ??0.1%.
5.3.2 Optical system: The schematic diagram of its test principle is shown in Figure 1. It consists of two lenses L1 and L2 with focal length f not less than 500 mm and corrected for chromatic aberration. The relative aperture of the lens does not exceed f/20. The distance between the lens L1 and the light source shall be adjustable, to obtain a substantially parallel beam. On the side away from the light source at a distance of 100 mm??50 mm from the lens L1, install a diaphragm A1. LIMIT the diameter of the beam to 7 mm??1 mm. The second
diaphragm A2 shall be placed in front of the lens L2 with the same performance as L1. The image of the light source shall be located in the center of the receiver. The third diaphragm A3, whose diameter is slightly larger than the cross-section of the maximum size of the light source image. It shall be placed in front of the receiver, to avoid the scattered light generated by the sample falling on the receiver. The measuring point shall be at the center of the beam.
2 - Lens L1; 6 - Lens L2;
3 - Diaphragm A1; 7 - Diaphragm A3;
4 - Sample; 8 - Receiver.
Figure 1 -- Schematic diagram of test principle of optical system
5.3.3 Measuring device: The relative spectral sensitivity of the receiver shall be consistent with the CIE 1931 spectral luminous efficiency. The sensitive surface of the receiver shall be covered with a scattering medium; and shall be at least twice the cross-section of the largest size of the light source image. If an integrating sphere is used, the diameter of the sphere's entrance port shall be at least twice the cross-section of the largest size of the light source image. The linearity of the receiver and the supporting indicator shall not be greater than ??2% of full scale or ??10% of the reading value. Choose a small value. 5.4 Test procedure
5.4.1 TURN on the power of the instrument. Before putting the sample into the light path, adjust the display value of the receiver to 100. BLOCK the light path; adjust the receiver display value to 0.
5.4.2 PUT the sample between the diaphragms A1 and A2. Adjust the orientation of the sample, so that the incident angle of the beam and the glass surface is 90????5??.
5.4.3 Determine the visible light transmittance of the sample; READ the receiver display value n. The result retains 1 decimal place. The visible light
transmittance ??r is equal to n/100.
6 Secondary image separation test
6.1 Test purpose
Determine the angular separation between the primary and secondary images. 6.2 Sample
USE the product as a sample.
6.3 Test methods
Two test methods can be used:
a) Target test;
3 - Center of field of view.
Figure 6 -- Example of observation by collimation telescope test
6.5.3 Test procedure
In order to easily see the existence of secondary image, set the instrument in a dark room or dark place. USE the collimation telescope to measure the most severe area of the sample under the real vehicle installation angle, to determine the maximum value of secondary image separation. It is also possible to use the target-type illuminant control instrument to check the safety glazing material with a simple and fast scanning method, to determine in which areas the most severe secondary image appears.
7 Optical distortion test
7.1 Test purpose
Determine the optical distortion of safety glazing material.
7.2 Sample
USE the product as a sample.
7.3 Test apparatus
The test apparatus shall consist of the following parts:
a) Slide projector: SELECT a suitable light source. The focal length shall not be less than 90 mm. The relative aperture shall be about 1/2.5. The light path is shown in Figure 7. A diaphragm with a diameter of 8 mm is placed about 10 mm in front of the lens.
b) Slide: The projected image is a bright circular array on a dark background. The quality and contrast of the slide shall meet the test requirements, in order to control the measurement error within 5%. When the sample is not placed in the light path, the slide shall get the image shown in Figure 8 on the screen.
Where:
???? - Optical distortion, in minutes of arc (');
??d - Maximum deformation, in millimeters (mm);
R2 - The distance from the sample to the screen, in meters (m).
8 Visible light reflectance test
8.1 Test purpose
Determine the visible light reflectance of safety glazing material under standard illuminant A conditions.
8.2 Sample
It shall use the product or test piece. The test piece can be cut from the corresponding test area on the product. Before the test, the sample shall be clean and free of dirt and condensation.
8.3 Test apparatus
8.3.1 Test apparatus can be divided into spectrophotometer and photoelectric integrating photometer. The maximum allowable error shall not be greater than 1.5%.
8.3.2 From the measured spectral reflectance value ??(??), the
spectrophotometer shall be able to use the relative spectral power distribution function SA(??) of the standard illuminant A and the CIE spectral luminous efficiency V(??) to calculate the visible light reflectance for standard illuminant A. 8.3.3 The relative spectral power distribution of the light source of the photoelectric integrating photometer shall conform to the CIE standard
illuminant A. The relative spectral response of the detector shall conform to the CIE spectral luminous efficiency V(??); and directly generate the visible light reflectance of the standard illuminant A.
8.3.4 The geometric (optical) conditions of the test apparatus shall be one of the following:
a) Diffuse/vertical (d : 0??): The sample is diffusely illuminated by an integrating sphere. The angle between the normal of the sample and the
axis of the measuring beam shall not exceed 10??. The angle between any
one of the beams of at least one end of the receiving beam and its own
optical axis does not exceed 5??.
b) Vertical/diffuse (8?? : d): The sample is illuminated by a beam of light. The angle between the axis of the beam and the normal of the sample shall
not exceed 8??. USE an integrating sphere to collect the reflected luminous flux. The angle between any one of the beams of at least one end of the illuminating beam and its own optical axis does not exceed 5??.
8.3.5 The diameter of the integrating sphere of the test apparatus shall not be less than 100 mm. The total area of the opening shall not be greater than 10% of the surface area of the sphere. The inner surface of the sphere is uniformly coated with a highly diffuse reflective material, which is almost non-selective for the spectrum.
8.3.6 The light absorbing trap of the test apparatus shall be a device, which can reduce the reflection caused by transmitted light to 1% or less of the measured visible light reflectance. It can also block spurious transmitted light from the opposite side of the sample.
8.4 Test procedure
8.4.1 CLEAN the sample.
8.4.2 For the spectrophotometer, the visible light reflectance is calculated according to formula (5). The result is accurate to 0.1%.
Where:
??A - Visible light reflectance under standard illuminant A conditions;
??(??) - Spectral reflectance measured by a spectrophotometer;
S(??)V(??) - The relative value of the product of the relative spectral power distribution function of the standard illuminant A and the CIE spectral luminous efficiency. See Annex C.
8.4.3 For the photoelectric integrating photometer, directly measure the sample. The value obtained is the visible light reflectance. The result is accurate to 0.1%.
8.4.4 RECORD the type of sample, the instrument used, and the visible light reflectance of the sample.

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