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相关概念视频

Distance Corrections01:15

Distance Corrections

27
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...
27
Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

32
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 short...
32
Distance Measurements by Taping01:18

Distance Measurements by Taping

32
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...
32
Errors in Taping01:18

Errors in Taping

23
Errors in taping arise from multiple factors that can significantly impact measurement accuracy in surveying. Misalignment of the tape, often due to human error, is one primary source. A skilled rear tapeman, using a telescope, can help correct alignment by guiding the head tapeman; however, human limitations still lead to small inaccuracies. These errors may include misplacement of pins or inaccurate tape readings due to common visual confusions, such as mistaking a six for a nine. Such...
23

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相关实验视频

Updated: Jun 21, 2025

Quantifying the Relative Thickness of Conductive Ferromagnetic Materials Using Detector Coil-Based Pulsed Eddy Current Sensors
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使用基于模糊逻辑的EMAT进行厚度测量

Yingjie Shi1,2, Shihui Tian1, Jiahong Jiang1

  • 1Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China.

Sensors (Basel, Switzerland)
|July 13, 2024
PubMed
概括

本研究提出了一种新的模糊逻辑组合方法,用于使用电磁超声波 (EMAT) 增强金属厚度测量. 该技术在工业应用中显著提高了范围和精度.

关键词:
电磁声学传感器 电磁声学传感器模糊的逻辑模糊的逻辑脉冲压缩脉冲的压缩测量厚度的测量方法

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Last Updated: Jun 21, 2025

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科学领域:

  • 材料科学 材料科学 材料科学
  • 非破坏性测试 不破坏性测试
  • 超声波测量方法 超声波测量方法

背景情况:

  • 准确的非接触金属厚度测量对于工业至关重要.
  • 现有的超声波方法,包括电磁超声波 (EMAT),在范围和精度上有局限性.
  • 这些限制阻碍了EMAT的广泛采用.

研究的目的:

  • 为EMAT开发一种新的联合厚度测量方法.
  • 通过提高范围和准确性来扩大EMAT的应用范围.
  • 将模糊逻辑与超声波技术集成在一起,以提高性能.

主要方法:

  • 利用一种新的综合方法,将模糊逻辑与超声波技术相结合.
  • 使用短脉冲飞行时间 (TOF) 进行初始厚度估计.
  • 包含使用共振,短脉冲回声和线性频率调制回声的二次测量,以模糊逻辑为指导.

主要成果:

  • 实现了0.3-1000.0毫米的广泛测量范围.
  • 证明了高水平的准确性,中位误差在±0.5mm内.
  • 综合方法的性能优于传统的短脉冲回声技术.

结论:

  • 新的模糊逻辑组合方法显著提高了金属厚度测量的EMAT性能.
  • 与现有方法相比,这种方法提供了更广泛的测量范围和更高的精度.
  • 该技术对各种工业应用具有巨大潜力,需要精确,非接触式厚度测量.