通过探测器尼奎斯特采样精确的透镜扭曲测量
Yongqiang Yang1,2, Zhiyi Wang1, Junlin Li1
1Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China.
Sensors (Basel, Switzerland)
|March 14, 2026
概括
这项研究引入了一种新的透镜扭曲测试方法,使用尼奎斯特采样. 它可以非常精确地为工业成像镜头实现高精度的扭曲测量.
科学领域:
- 光学工程是指光学工程.
- 图像计量学 图像计量学
- 镜头的特征 镜头的特征
背景情况:
- 镜头扭曲显著影响成像性能.
- 精确的扭曲测量对于工业应用至关重要.
- 现有的方法可能缺乏精度或分辨率.
研究的目的:
- 开发一个高精度的镜头扭曲测试方法.
- 为了能够准确地测量扭曲分布.
- 为了评估传统的工业成像镜头.
主要方法:
- 使用探测器尼奎斯特采样图像数据.
- 在Nyquist采样条件下分析Moiré边缘图案.
- 应用相位移算法和扭曲公式.
主要成果:
- 实现了高测试准确度和采样分辨率.
- 在图像平面扭曲方面表现出一致的线性趋势.
- 获得的放大偏差因子可重复度为±108 nm/cm.
- 实现了 ±108 nm/cm3.3 的第三级扭曲测量精度.
结论:
- 提出的尼奎斯特采样方法提供了高精度的扭曲评估.
- 这种技术适用于传统的工业成像镜头.
- 该方法提供可靠和准确的镜头扭曲数据.
更多相关视频
06:55Scanning Light Scattering Profiler SLPS Based Methodology to Quantitatively Evaluate Forward and Backward Light Scattering from Intraocular Lenses
Published on: June 6, 2017
8.0K
07:03Medical-grade Sterilizable Target for Fluid-immersed Fetoscope Optical Distortion Calibration
Published on: February 23, 2017
8.1K
相关概念视频
01:18Aliasing
744
Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original...
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original...
744
01:15Sampling Theorem
1.5K
In signal processing, the analysis of continuous-time signals, denoted as x(t), often involves sampling techniques to convert these signals into discrete-time signals. This process is essential for digital representation and manipulation. A critical component in sampling is the train of impulses, characterized by the sampling interval and the sampling frequency. The relationship between these parameters and the original signal's properties dictates the success of the sampling process.
1.5K
01:22Upsampling
682
Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...
682