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関連する概念動画

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

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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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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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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
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アレイ導波路からのコヒーレントパターンのデコーディングによる自由空間光角度推定

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.

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まとめ
この要約は機械生成です。

本研究では、導波路デコーディングと深層学習を用いた新しい光角度（AOA）推定法を紹介する。この技術は、従来のAOAセンサーの限界を克服し、高精度と堅牢性を達成する。

キーワード:
角度推定アレイ導波路注意機構コヒーレントモードデコーディング畳み込みニューラルネットワーク

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関連する実験動画

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科学分野:

  • フォトニクス
  • 光学センシング
  • 人工知能

背景:

  • 従来の角度（AOA）推定法は、小型化、複雑さ、信頼性に課題を抱えています。
  • 既存の技術では、コンパクトで堅牢な光学センサーの需要を満たすことが困難です。

研究 の 目的:

  • 従来の技術の限界を克服する新しい自由空間光AOA推定法を提示すること。
  • アレイ導波路コヒーレントモードデコーディングと深層学習を活用して、正確な空間角度情報取得を行うこと。

主な方法:

  • 入射光の伝播とアレイ入力導波路での干渉から得られるAOA関連の位相差を利用します。
  • スラブ導波路出力でマルチビーム干渉縞を形成し、アレイ出力導波路でサンプリングします。
  • AOA推定のために、訓練された畳み込みニューラルネットワーク（CNN）-Attention Regressorを使用します。

主要な成果:

  • 40°視野にわたって平均絶対誤差（MAE）0.0142°および二乗平均平方根誤差（RMSE）0.0193°を達成しました。
  • 従来のピーク線形キャリブレーションおよび他のニューラルネットワークアーキテクチャと比較して、優れた精度を示しました。
  • シミュレートされた位相ノイズおよび製造公差に対して顕著な堅牢性を示しました。

結論:

  • 新しい方法は、光学信号の空間角度情報を効果的にデコードします。
  • 集積フォトニクスと深層学習の相乗効果が、高度な光学センシングに役立つことを強調します。
  • 高度に統合され、堅牢で高性能なオンチップ光学センサーへの道を開きます。