GB/T 36403-2018Test methods of infrared transmittance for infrared optical glass—Fourier transform method (English PDF)
红外光学玻璃红外透过率测试方法 傅里叶变换法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
June 7, 2018
Implementation date
May 1, 2019
Scope
GB/T 36403-2018 is the English-translated version of 红外光学玻璃红外透过率测试方法 傅里叶变换法.
GB/T 36403-2018 describes how to measure the infrared transmittance of infrared optical glass by the Fourier transform method. Infrared transmittance is the percentage of radiant flux that passes through the front and back faces of the sample.
The standard covers the test principle, the test equipment, the samples, which are parallel plates at least 2 mm thick with polished faces, and the test environment of 20 °C ± 5 °C and no more than 70% relative humidity.
It then gives the test procedure, from the baseline measurement to recording the transmittance data and curves, followed by data processing, measurement uncertainty and the test report.
Crystals, ceramics and other infrared optical materials may be tested with it as a reference. It was issued on 7 June 2018 and has applied since 1 May 2019.
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Document preview — GB/T 36403-2018
National Standard of the People's Republic of China
- ICS
- 81.040.10
- Classification
- Q 37
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword3
- 1 Scope4
- 2 Terms and Definitions4
- 3 Test Principle4
- 4 Test Equipment6
- 5 Test Sample7
- 6 Test Environment7
- 7 Test Procedure7
- 8 Data Processing7
- 9 Measurement Uncertainty8
- 10 Test Report8
- Appendix A (informative appendix)9
1 Scope
This Standard specifies the terms, definitions, test principle, test equipment, test samples, test environment, test procedure, data processing, measurement uncertainty and test report of the test of infrared transmittance for infrared optical glass through Fourier transform method.
This Standard is applicable to the test of infrared transmittance of infrared optical glass (wavelength. <= 2.5 µm); infrared optical materials, such as crystal and porcelain, can also take this Standard as a reference.
2 Terms and Definitions
The following terms and definitions are application to this Standard.
2.1 Infrared Transmittance
Infrared transmittance refers to the transmittance of infrared optical glass on the infrared band. It is expressed as the percentage of radiant (light) flux that transmits the front and back side of the sample.
3 Test Principle
The test principle of the test of infrared transmittance for infrared optical glass through Fourier transform method is demonstrated in Figure 1 below.
4 Test Equipment
Generally speaking, the exit wavelength of infrared source adopted in instrument shall be within the range of 2.5 µm ~ 25 µm. Before radiating into the interferometer, the light source shall pass collimated beam expander and uniform beam expander. The effective caliber of the instrument shall be >= 30 mm.
5 Test Sample
5.1 Dimension requirement. the sample shall be > effective caliber of the light hole; the thickness shall be >= 2 mm.
5.2 Processing requirement. sample shall be processed into parallel plate; the two luminous surfaces shall be polished; surface requirement. aperture shall be <= 1, partial aperture shall be <= 0.5; parallelism shall be <= 1'; surface rickets V, the remaining surfaces shall be thoroughly grinded.
6 Test Environment
6.1 Ambient Temperature
Ambient temperature shall be within 20 °C ± 5 °C.
6.2 Relative Humidity
The relative humidity of test environment shall be <= 70%.
7 Test Procedure
7.1 Switch on the instrument, pre-heat to stability.
7.2 Open the test software, input certain parameters, such as the range of wave number, the number of scanning and resolution.
7.3 Test cavity baseline.
7.4 Wipe the sample clean; put it into the sample room.
7.5 Test the transmittance of the sample; record the test data and curves.
7.6 Take out the sample, close the software; switch off the computer and the instrument.
8 Data Processing
Export the transmittance data and curves of various wavelengths. […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
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