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関連する概念動画

Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

2.7K
Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
2.7K
Distance Corrections01:15

Distance Corrections

436
To achieve precise distance measurements, especially in surveying and construction, certain corrections must be applied to account for potential sources of error like the standardization errors, temperature variations, and slope adjustments.Standardization error emerges when measurement equipment undergoes changes, such as wear, repairs, or weather impacts. To address this, surveyors compare the equipment’s readings to a standard. This process identifies any deviation that might lead to...
436
Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

776
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...
776
Leveling Equipment01:18

Leveling Equipment

678
As leveling involves measuring vertical distances relative to a horizontal line of sight, it requires a graduated rod, called a level rod, for vertical measurements and an instrument called a level for a horizontal sight line. A level includes a high-powered telescope with a mechanism for leveling to ensure the line of sight is horizontal when the bubble in the spirit level is centered. Leveling rods, made of wood, metal, or fiberglass, are graduated in feet or meters and commonly used in two-...
678
Influence of Earth's Curvature and Atmospheric Refraction on Leveling01:26

Influence of Earth's Curvature and Atmospheric Refraction on Leveling

1.4K
During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance.
1.4K
Adjusting a Traverse01:12

Adjusting a Traverse

480
In the site survey of a four-sided traverse, internal angles are essential to ensure geometric accuracy. The survey revealed that the sum of the measured internal angles was 359 degrees and 48 minutes, which is 12 minutes less than the expected 360 degrees. This discrepancy signals an error likely arising from measurement inaccuracies during the fieldwork.To rectify this error, the adjustment process involved distributing the 12-minute shortfall equally across the four internal angles. By...
480

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関連する実験動画

Updated: May 6, 2026

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
09:33

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

Published on: June 7, 2019

6.7K

光学的にアドレッシングされたメタ表面経由の空間光調節器.

Xuhao Fan1,2, Wei Xiong3,4, Ke Xu1

  • 1Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, China.

Nature nanotechnology
|February 16, 2026
PubMed
まとめ
この要約は機械生成です。

新しい光学的にアドレスされたメタ表面空間光調節器 (SLM) は,高ピクセル密度と高速の更新率を達成し,真のホログラフィーを可能にします. この突破は,高度なホログラムディスプレイと拡張現実アプリケーションの重要な値を満たしています.

さらに関連する動画

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

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Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms

Published on: September 25, 2020

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関連する実験動画

Last Updated: May 6, 2026

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
09:33

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms

Published on: September 25, 2020

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科学分野:

  • 光学とフォトニック
  • マテリアルサイエンス 材料科学
  • ナノテクノロジー ナノテクノロジー

背景:

  • ダイナミック・ウェーブフロント・モジュレーションは,ホログラフィック・ディスプレイ,AR/VR,LiDARにおいて極めて重要です.
  • 既存の空間光調節器 (SLM) は,必要なピクセル密度とリフレッシュレートに欠けている.
  • メタ表面および液晶SLMは,時空的産物密度,視野,および更新率に制限があります.

研究 の 目的:

  • 現在の技術の限界を克服する新しい空間光調節器 (SLM) を開発する.
  • 真のホログラフィーのための高空間時間的産物密度を達成するために.
  • リアルタイム複合幅ホログラフィーと高度な光学機能を可能にします.

主な方法:

  • 756nmピッチで独立して調節可能なメタ原子スーパーセルを使用して,光学的にアドレスを付いたメタ表面SLMの製造.
  • 性能を向上させるために,サブミクロメートルのスケールのピクセルを統合.
  • ホログラムの性能,フォーカシング,ビーム・ステアリングの機能に関するデバイスの特徴.

主要な成果:

  • 2.3 × 10 12 ピクセル s -1 cm -2 の空間時間的産物密度を達成し,真のホログラフィーの値を満たしました.
  • SLMのピクセルサイズをサブミクロメートルスケールに縮小しました.
  • リアルタイム・コンプレックス・アンプリチュード・ホログラフィー,3Dフォーカシング,可視スペクトルの ±20.6°の視野でビーム・ステアリングを実証した.

結論:

  • 開発された光学的にアドレスされたメタ表面SLMは,空間光調節技術を大幅に進歩させています.
  • このデバイスは,次世代のホログラムディスプレイ,AR/VR,LiDARの厳しい要件を満たしています.
  • 高い時空密度の製品と多用途な機能は,新しい光学アプリケーションの道を開く.