GB/T 40658-2021 in English
VALIDPotassium bromide optical elements
- Issued on:2021-10-11
- Implemented on:2022-05-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$272.00
《GB/T 40658-2021溴化钾光学元件》由TC103（全国光学和光子学标准化技术委员会）归口，TC103SC5（全国光学和光子学标准化技术委员会光学材料和元件分会）执行，主管部门为中国兵器工业集团公司。
Introduction
Analysis of the core content of the standard
Potassium bromide optical elementsAs an important infrared optical material, its standard stipulates the technical requirements for the entire process from raw material performance to processing accuracy:
| Technical category | Core indicators | Allowance deviation |
|---|---|---|
| Physical properties | Density 2.75g/cm³ | ±0.02g/cm³ |
| Optical properties | 0.2-25μm transmittance ≥90% | - |
| Mechanical properties | Vickers hardness ≥ 10.56kg/mm² | - |
Details of key performance indicators
Optical property parameters
Standard requirements Potassium bromide maintains excellent optical properties over a wide spectrum:
- Refractive index gradient: ≤1.7155 at 0.2537μm wavelength, ≤1.5204 at 25μm wavelength
- Temperature stability: refractive index temperature coefficient reaches -40.8×10-6/℃(25μm)
- Low absorption characteristics: light absorption coefficient in the 1μm band ≤0.000003cm-1
Processing accuracy requirements
When a certain infrared imaging lens uses a potassium bromide lens, special attention should be paid to the following:
- Surface roughness Ra≤10nm to ensure imaging clarity
- Parallelism deviation≤20' to ensure optical path collimation
- Surface shape deviation aperture number≤3 to control wavefront distortion
Key points for standard implementation
Test environment control
All tests must be carried out under (25±2)℃ and humidity≤70% conditions to avoid vibration and electromagnetic interference.
Typical test methods
| Test items | Equipment requirements | Sample specifications |
|---|---|---|
| Crystal orientation determination | X-ray orientation instrument (±30″) | 5×5×3mm cube |
| Refractive index test | Infrared refractometer (±0.00001) | 40×30×30mm prism |
Technology evolution analysis
Compared with the earlier version, this standard has the following major improvements:
- Added dynamic test requirements for refractive index temperature coefficient
- Light absorption coefficient test wavelength extended to 25μm
- Surface processing accuracy requirements increased by 20%
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