相关实验视频
Updated: Sep 11, 2025

16:11
Implementation of a Reference Interferometer for Nanodetection
Published on: April 26, 2014
9.5K
概括
本研究引入了一种新的光学频率 (OFC) 方法,用于同时测量三度自由度. 该技术实现了高精度,绝对距离和角度测量,克服了大型制造传统干扰测量的局限性.
科学领域:
- 光学和光子学 在光学和光子学.
- 计量学 计量学 计量学
- 机械工程 机械工程
背景情况:
- 高精度的几何测量对于大型设备制造至关重要,需要绝对,同时和可追溯的测量.
- 传统的光学干涉测量在测量范围上受到波长和衍射限制的限制.
- 光频 (OFC) 通过提供可追溯的长度参考提供了长距离绝对测量的解决方案.
研究的目的:
- 为了扩大适用性,开发一个同时多度自由度 (DOF) 测量技术.
- 整合光学频率与分散干扰测量,以增强测量能力.
- 为应对非线性频率采样和在多点测量中相互干扰的挑战.
主要方法:
- 一种基于分散干扰测量的新三DOF同时测量技术,使用光学频率.
- 改进了用于相位计算的两个不均的里叶变换算法,特别是改进了非均离散里叶变换 (NUDFT) 的非均快速里叶变换 (NUFFT).
- 将相位信息纳入NUFFT方法,以处理不统一的频率采样并减少测量点之间的干扰.
主要成果:
- 成功实施了三DOF同时测量系统.
- 实验验证显示在3弧秒内达成一致,相比之下,对于高达1000弧秒的角度,自动聚合器的效果是一致的.
- 证明绝对测量方案在很大程度上不受时间等环境因素的影响.
结论:
- 本技术可实现绝对的,高精度的,同时进行多DOF测量,克服了传统干扰测量的范围限制.
- 改进的福里埃变换算法有效地解决非线性频率采样和信号干扰.
- 这种方法在需要精确的角度监测和特征检测的大规模制造中的应用中具有显著的潜力.
相关概念视频
IR Spectrometers
1.5K
There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
1.5K
Discrete Fourier Transform
406
The Discrete Fourier Transform (DFT) is a fundamental tool in signal processing, extending the discrete-time Fourier transform by evaluating discrete signals at uniformly spaced frequency intervals. This transformation converts a finite sequence of time-domain samples into frequency components, each representing complex sinusoids ordered by frequency. The DFT translates these sequences into the frequency domain, effectively indicating the magnitude and phase of each frequency component present...
406
Electronic Distance Measuring Instruments
118
Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over...
118
Discrete-time Fourier transform
476
The Discrete-Time Fourier Transform (DTFT) is an essential mathematical tool for analyzing discrete-time signals, converting them from the time domain to the frequency domain. This transformation allows for examining the frequency components of discrete signals, providing insights into their spectral characteristics. In the DTFT, the continuous integral used in the continuous-time Fourier transform is replaced by a summation to accommodate the discrete nature of the signal.
One of the notable...
One of the notable...
476
Continuous -time Fourier Transform
405
The Fourier series is instrumental in representing periodic functions, offering a powerful method to decompose such functions into a sum of sinusoids. This technique, however, necessitates modification when applied to nonperiodic functions. Consider a pulse-train waveform consisting of a series of rectangular pulses. When these pulses have a finite period, they can be accurately represented by a Fourier series. Yet, as the period approaches infinity, resulting in a single, isolated pulse, the...
405
One-Degree-of-Freedom System
556
In mechanical engineering, one-degree-of-freedom systems form the basis of a wide range of electrical and mechanical components. Using these models, engineers can predict the behavior of various parts in a larger system, which gives them insight into how different forces interact with each other.
A one-degree-of-freedom system is defined by an independent variable that determines its state and behavior. One example of a one-degree-of-freedom system is a simple harmonic oscillator, such as a...
A one-degree-of-freedom system is defined by an independent variable that determines its state and behavior. One example of a one-degree-of-freedom system is a simple harmonic oscillator, such as a...
556

