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相关概念视频

Linear Approximation in Time Domain01:21

Linear Approximation in Time Domain

318
Nonlinear systems often require sophisticated approaches for accurate modeling and analysis, with state-space representation being particularly effective. This method is especially useful for systems where variables and parameters vary with time or operating conditions, such as in a simple pendulum or a translational mechanical system with nonlinear springs.
For a simple pendulum with a mass evenly distributed along its length and the center of mass located at half the pendulum's length,...
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Linear Approximation in Frequency Domain01:26

Linear Approximation in Frequency Domain

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Linear systems are characterized by two main properties: superposition and homogeneity. Superposition allows the response to multiple inputs to be the sum of the responses to each individual input. Homogeneity ensures that scaling an input by a scalar results in the response being scaled by the same scalar.
In contrast, nonlinear systems do not inherently possess these properties. However, for small deviations around an operating point, a nonlinear system can often be approximated as linear....
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IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

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Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
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Tapes are essential in surveying for accurate, durable, and short-distance measurements. Made from lightweight, nylon-coated steel, they offer flexibility and strength for rugged outdoor use. The nylon coating protects against rust and wear, extending the tape's life. Standard lengths, around 30 meters, are marked in meters and millimeters for precision.Surveyors select tapes based on site conditions and accuracy needs. Lightweight, nylon-coated tapes are commonly used for ease of handling and...
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相关实验视频

Updated: Jan 9, 2026

Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
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从数组波导来解码连贯模式,用于自由空间光学到达角度估计.

Jinwen Zhang1, Haitao Zhang1, Zhuoyi Yang1

  • 1State Key Laboratory of Precision Space-Time Information Sensing Technology, Department of Precision Instrument, Tsinghua University, Beijing 100084, China.

Sensors (Basel, Switzerland)
|December 11, 2025
PubMed
概括
此摘要是机器生成的。

本研究引入了一种使用波导解码和深度学习的新光学到达角度 (AOA) 估计方法. 该技术实现了高精度和稳定性,克服了传统AOA传感器的局限性.

关键词:
抵达角度估计估计.一个排列的波导.注意力机制注意力机制一致的模式解码.卷积神经网络是一种卷积神经网络.

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科学领域:

  • 光子学 是一个光子学.
  • 光学传感传感器是什么?
  • 人工智能的人工智能

背景情况:

  • 传统的到达角度 (AOA) 估计方法在小型化,复杂性和可靠性方面面临挑战.
  • 现有的技术很难满足对紧和强大的光学传感器的需求.

研究的目的:

  • 提出一种新的自由空间光学AOA估计方法,克服传统技术的局限性.
  • 为了利用阵列波导连贯模式解码和深度学习来精确的空间角度信息检索.

主要方法:

  • 利用与AOA相关的相差,从发生光传播和干扰到阵列输入波导中.
  • 在板波导输出处形成多束干扰边缘,由阵列输出波导取样.
  • 雇佣了一个经过培训的卷积神经网络 (CNN) -注意力回归器用于AOA估计.

主要成果:

  • 在40度视野中,达到0.0142°的平均绝对误差 (MAE) 和0.0193°的根平均平方误差 (RMSE).
  • 与传统的峰值线性校准和其他神经网络架构相比,证明了更高的精度.
  • 对模拟相位噪声和制造公差表现出了显著的稳定性.

结论:

  • 这种新方法有效地解码光学信号的空间角度信息.
  • 突出了集成光子学和深度学习之间的协同作用,用于先进的光学传感.
  • 为高度集成,强大和高性能芯片内光学传感器铺平了道路.