GB/T 44221-2024 in English
VALIDDetermination of wavefront aberration in optical systems—Electro-optical Shack-Hartmann method
- Issued on:2024-07-24
- Implemented on:2025-02-01
- File Format:PDF
- Delivery:Via email within 5 business days
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《GB/T 44221-2024光学系统波前像差的测定 夏克-哈特曼光电测量法》由TC487（全国光电测量标准化技术委员会）归口，主管部门为中国科学院。
Introduction
Analysis of the core content of the standard
GB/T 44221-2024 standard specifies the complete technical framework for optical system testing using the Shack-Hartmann wavefront aberration meter. Its core innovations are reflected in:
| Technical dimension | Autocollimation method | Direct method |
|---|---|---|
| Measurement principle | The light path passes through the system under test twice | Single pass through the system under test |
| Influence of accuracy | The result is magnified by 2 times | Directly reflects the true value |
| Scope of application | Reflection system detection | Transmission system detection |
Key technical points
1. Wavefront reconstruction algorithm
The standard recommends two core algorithms:
- Pattern reconstruction method: It adopts Zernike polynomial expansion and is applicable to circular aperture systems
- Region reconstruction method: It includes three models of Hugh Jin/Fred/Sauchwell to solve the measurement of irregular apertures
2. Environmental control requirements
The standard strictly stipulates the measurement conditions:
The temperature is controlled at 20±2℃, the fluctuation is ≤±1℃ in 24 hours, the humidity is ≤75%, and the sample needs to be isothermally adjusted for ≥2 hours
Implementation Suggestions
Equipment Selection Guide
Things to pay attention to when selecting a measurement instrument:
- Working wavelength prioritizes 632.8nm laser
- Sampling resolution matches the accuracy of the device being measured
- Auxiliary lens F number ≤ radius of curvature of the device being measured/clear aperture
Data Processing Specifications
After removing outliers according to standard requirements, the calculation formula is:
Φpv = (∑Φpvi)/j Φrms = (∑Φrmsi)/j
The result is retained to three decimal places, and the standard deviation is calculated to evaluate repeatability
Standard Evolution Analysis
Compared with the early GB/T 2831 and other standards. The main progress of this document:
- Added a measurement solution for aspheric optical parts
- Clarified the application of 48 coefficients of Zernike polynomial
- Introduced technical elements of ISO/TR 14999-2 international standard
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