This standard applies to the optical performance test of welding goggles. GB/T 3609.3-1983 Optical performance test method for welding goggles GB/T3609.3-1983 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Methods of optical test for welding goggles
Methods of optical test for welding goggles This standard applies to the optical performance test of welding goggles. 1 Transmittance test
1.1 Instrument
A fully automatic, full-band spectrophotometer is selected, but it must be equipped with an attenuation plate accessory. 1.2 Test
1.2.1 Ultraviolet transmittance test
Only for the two wavelengths of 313nm and 365nm, first measure the absorption value and calculate the transmittance value. 1.2.2 Infrared transmittance test
UDC 614.891/.893
: 621.791: 535
GB 3609.3—83
Infrared rays are from 780 to 2000mm, and the transmittance value is read every 10nm. Finally, the average transmittance is calculated according to the formula. The near infrared is 780~1300nm and is calculated according to formula (1): (1300nmr (a) da
520J780nmm
The mid-infrared is 1300~2000nm and is calculated according to formula (2): (1)
J m () da
When the transmittance value of filter shading number 1.2~6 is greater than 0.5%, the above direct reading method can be used to calculate the transmittance according to the above formula. When the transmittance of filter shading number 7~16 is less than 0.5%, the direct reading method cannot be used. The transmittance value must be calculated by measuring absorption with an attenuation plate.
2 Test of visible light transmittance
2.1 Instrument
Use an optical densitometer for testing, and the instrument accuracy is ±0.10D. 2.2 Test Principle and process
The shading number of the filter is determined by formula (3): S
Where: S—filter shading number,
D——optical density.
(3)
During the test, place the sample in the test position of the optical densitometer to measure the optical density of the filter, and then calculate the shading number and visible light transmittance according to formula (3).
3 Parallelism test
is one of the means to evaluate the optical quality of the filter 3.1 Test device See the figure.
National Bureau of Standards 1983-04-15 Issued
1984-01-01 Implementation
3.2 Equipment
Cloud light source
Light source, condenser, ruler, condenser seat. 3.3 Test steps
GB3609.3—83
Condenser
Turn on the power, adjust the zero point, so that the 1m light spot falls on the zero point of the ruler, that is, perpendicular to each other, and then put the dew test sample on the condenser. Between the mirror and the ruler (the light is 1m from the sample surface to the ruler), when the light is incident vertically from the first surface and then passes through the second surface of the sample, if the ruler deviates by 1cm, it is called a prism degree. If it is below 1/6 prism degree, it is qualified. In the absence of the above device, the thickness of the lens can be directly measured to determine the parallelism. The specifications and dimensions of the filter are specified in GB3609.1--834.1.1. The thickness difference in the long direction of
must be less than:
1 Length difference = tg12'23\×108=0.00331×108=0.354mmThe thickness difference in the width direction should be less than:wwW.bzxz.Net
1Width difference=tg12*23×50=0.0036×50=0.180mmIt is stipulated that the thickness of the four corners of the filter should be measured. The average value of the thickness of the two corners of one side is the thickness of this side. The difference in thickness of the opposite sides should be less than the above specified value.
4Diopter test
Use an ordinary diopter inspection machine to test. The diopter between the two meridians of each filter does not exceed 0.125D. The instrument accuracy requirement is ±0.05D.
5Color measurement
The color of the filter cannot be a single color, but a mixed color, preferably brown or dark green. Use a spectrophotometer to test. The wavelength of the maximum transmittance should be between 500 and 620nm, or gray. Visually inspect under a 60W incandescent light. Additional Notes:
This standard was proposed by the Ministry of Labor and Personnel of the People's Republic of China. This standard was drafted by the Beijing Institute of Labor Protection Science. The main drafters of this standard are Li Shuxian, Xing Zhiming, Ti Changqing and Du Xia.
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