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相关概念视频

Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

407
Consider a crane whose telescopic boom rotates with an angular velocity of 0.04 rad/s and angular acceleration of 0.02 rad/s2. Along with the rotation, the boom also extends linearly with a uniform speed of 5 m/s. The extension of the boom is measured at point D, which is measured with respect to the fixed point C on the other end of the boom. For the given instant, the distance between points C and D is 60 meters.
Here, in order to determine the magnitude of velocity and acceleration for point...
407
Statically Indeterminate Problem Solving01:16

Statically Indeterminate Problem Solving

430
Statically indeterminate problems are those where statics alone can not determine the internal forces or reactions. Consider a structure comprising two cylindrical rods made of steel and brass. These rods are joined at point B and restrained by rigid supports at points A and C. Now, the reactions at points A and C and the deflection at point B are to be determined. This rod structure is classified as statically indeterminate as the structure has more supports than are necessary for maintaining...
430
Types of Global Positioning System Surveys01:30

Types of Global Positioning System Surveys

63
GPS surveying methods vary in application, accuracy, and data collection techniques, catering to diverse surveying and mapping needs. Static GPS, kinematic GPS, and real-time kinematic (RTK) surveying are widely used. Each technique offers distinct advantages.Static GPS involves placing one receiver at a known reference point and another at the target point. It collects exact positional data by observing multiple satellite ranges over an extended period, achieving centimeter-level accuracy for...
63
Adjusting a Traverse01:12

Adjusting a Traverse

66
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...
66
Distance Measurements by Taping01:18

Distance Measurements by Taping

46
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...
46
Differential Leveling01:12

Differential Leveling

190
Differential leveling is a precise method in surveying used to determine the elevation difference between two points. Its primary goal is to establish accurate vertical measurements to create level surfaces or grade lines critical for designing and constructing infrastructures such as roads, bridges, and buildings.The procedure for differential leveling begins with setting up and leveling the instrument at a point where the benchmark can be seen. The level rod is held on the benchmark (BM), and...
190

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相关实验视频

Updated: Jul 12, 2025

Long-term Video Tracking of Cohoused Aquatic Animals: A Case Study of the Daily Locomotor Activity of the Norway Lobster Nephrops norvegicus
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峰值跟踪BOTDA与动态三元搜索

Di Qi, Xun Guan, Yuansen Cheng

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    此摘要是机器生成的。

    这项研究引入了一个峰值跟踪的Brillouin光学时间域分析 (PT-BOTDA) 系统. 它显著减少了频率扫描,提高了分布式光纤传感应用的效率.

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    科学领域:

    • 光电学是指光电子产品.
    • 光纤传感传感器是指光纤传感器.
    • 光子学 是一个光子学.

    背景情况:

    • 布里卢恩光学时间域分析 (BOTDA) 对于分布式光纤传感至关重要.
    • 传统的BOTDA系统需要广泛的频率扫描,限制了测量速度和效率.
    • 精确的布里卢因频率转移 (BFS) 确定对于精确的应变和温度测量至关重要.

    研究的目的:

    • 为 BOTDA 系统开发一个高效的动态 Brillouin 频率转移 (BFS) 搜索方案.
    • 为了减少一次测量所需的扫描频率的数量.
    • 在各种条件下评估拟议方案的性能.

    主要方法:

    • 实施一个峰值跟踪BOTDA (PT-BOTDA) 系统.
    • 开发使用三元搜索的动态BFS搜索方案.
    • 在频率选择和Brillouin增益之间建立一个反循环.
    • 用不同的搜索细粒度和传感范围进行性能评估.

    主要成果:

    • 在1MHz和0.1MHz阶段,扫描频率分别降低了至少85%和97%.
    • 保持了3米的空间分辨率.
    • 在足够的信号噪声比 (SNR) 条件下,证明了令人信服的BFS搜索准确性.
    • 以较小的搜索间隔展示了效率的提高.

    结论:

    • 拟议的带有三元搜索的PT-BOTDA显著提高了测量效率.
    • 该方案有效地减少了频率扫描要求,而不会影响精度.
    • 这一进步为分布式光纤传感提供了更实用,更快的解决方案.