概括
我们介绍了频率调制的连续波数字全息 (FMCW-DH) 用于使用时间和空间频率进行高容量的全息复杂化. 这种方法成功地将多个全息图进行多重复合,并以高精度测量表面配置文件.
科学领域:
- 光学和光子学 在光学和光子学.
- 全息影像的使用方法.
- 计量学 计量学 计量学
背景情况:
- 全息复合对于增加数据存储和传输能力至关重要.
- 现有的方法面临带宽和多重传输能力的局限性.
- 数字全息提供先进的波浪前线记录和重建.
研究的目的:
- 提出和演示一种新的离轴频率调制连续波数字全息 (FMCW-DH) 技术.
- 为了利用时空和空间频率来增强全息复杂化带宽.
- 为了验证该技术在复杂化多个全息图和测量表面配置文件方面的有效性.
主要方法:
- 实现一个离轴数字全息图设置.
- 使用频率调制的连续波光源来产生时间载波频率.
- 采用离轴配置来实现空间载波频率的多重化.
- 展示两个物体在两个波长上的全息图的多重复合.
- 重建复杂的波面并应用双波长方法进行表面造型.
主要成果:
- 通过使用时间和空间频率的组合,成功地进行了多个全息图的多重复合.
- 从复杂的波线上准确地重建相位分布图.
- 使用双波长方法精确测量已知的步高,验证该技术的计量能力.
结论:
- 拟议的FMCW-DH技术通过利用时间和空间频率有效地扩展可多重复的带宽.
- 这种方法为高容量的全息数据存储和先进的光学计量提供了可行的解决方案.
- 在表面配置文件中展示的应用突出了FMCW-DH的实际实用性.
相关概念视频
01:17Bandpass Sampling
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In signal processing, bandpass sampling is an effective technique for sampling signals that have most of their energy concentrated within a narrow frequency band. This type of signal is known as a bandpass signal. The key principle of bandpass sampling involves sampling the signal at a rate that is greater than twice the signal's bandwidth to prevent aliasing.
A bandpass signal has a spectrum with a lower frequency limit, denoted as ω1, and an upper frequency limit, denoted as ω2....
A bandpass signal has a spectrum with a lower frequency limit, denoted as ω1, and an upper frequency limit, denoted as ω2....
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01:10Reconstruction of Signal using Interpolation
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Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next...
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