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Light Acquisition02:16

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In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
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Directional relays, essential for managing unidirectional fault currents, enhance the safety and efficiency of power systems. On power lines equipped with directional relays, faults downstream (to the right) of the current transformer typically cause the fault current to lag the bus voltage by approximately 90 degrees, known as the forward direction. In contrast, upstream (left-side) faults may result in the fault current leading the bus voltage by nearly 90 degrees, termed the reverse...
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Electronic Distance Measuring Instruments01:30

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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...
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When measuring distances in areas with physical obstructions, such as a lake in a field, surveyors must employ techniques to calculate accurate lengths without direct line measurements. One effective method is the offset technique, which allows for precise distance estimation over inaccessible stretches.In this scenario, a surveyor must measure a side of an area that crosses a lake. Since the measuring tape cannot span the lake, the surveyor begins by establishing a baseline that aligns with...
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遠距離探知器の光源とインジェクションロックを備えた長距離開路BOTDA

Mengying Ru, Jiageng Chen, Zuyuan He

    Optics letters
    |August 29, 2025
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    まとめ
    この要約は機械生成です。

    この研究では,端末から端末までの Brillouin 光学時間領域分析 (BOTDA) システムを導入し,検出範囲を拡張します. この新しい構成は,高解像度と精度で長距離ファイバーセンシングを実現します.

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    科学分野:

    • 光電子機器
    • 光ファイバーセンサー
    • 光学について

    背景:

    • 従来のブリルーイン光学時間領域分析 (BOTDA) システムは,二端アクセスアーキテクチャを使用します.
    • このアーキテクチャは,試験中のファイバー (FUT) の往復配線レイアウトを必要とします.
    • 探知範囲は 繊維の長さの半分に制限されています

    研究 の 目的:

    • BOTDAシステムのエンドツーエンドのトポロジー構成を提案し,実証する.
    • オープンパスの設定で長い検出範囲を達成します.
    • 従来のBOTDAシステムの範囲の制限を克服するために.

    主な方法:

    • ポンプと探査機のライトが反対側からFUTに入ってくるエンドツーエンドのトポロジーを実装しました.
    • 遠端の探査機にリモート光源を使用した.
    • ポンプとプローブライトの間の周波数同期のためのインジェクションロックを使用し,バックワードプローパゲッティングプローブライトをマスターソースとして使用します.

    主要な成果:

    • 80kmのシングルモード・ファイバーで システムを実証しました
    • FUTの端で5.0mの空間解像度を達成しました.
    • FUTの反対端で0.85MHzの周波数不確実性を得ました.

    結論:

    • 提案された端から端のBOTDA構成は,検出範囲を効果的に拡張します.
    • このシステムは,長距離で高い空間解像度と周波数精度を示しています.
    • この構成は,長距離光ファイバーセンシングアプリケーションに有効なソリューションを提供します.