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相关概念视频

Local Attraction01:22

Local Attraction

40
Local attraction refers to disturbances in compass readings caused by magnetic influences from nearby objects such as metal fences, buried pipes, vehicles, buildings, power lines, or natural iron ore deposits. Small items like wristwatches, steel tools, or belt buckles can also interfere with the compass by creating local magnetic fields that distort the Earth's natural magnetic field. These distortions lead to inaccurate readings, posing navigation and land surveying challenges.Local...
40
Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

263
Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
263
Magnetic Declination01:19

Magnetic Declination

33
Magnetic declination is the angle between true north, which aligns with the Earth's rotational axis, and magnetic north, which follows the direction of the Earth's magnetic field. This discrepancy exists because the magnetic poles do not coincide with the geographic poles. The value of magnetic declination depends on the observer's location on Earth and is subject to changes over time due to the dynamic nature of the Earth's magnetic field.The declination is called eastern when magnetic north...
33
Meridians01:28

Meridians

314
In surveying, meridians are vital reference lines to measure directions and establish accurate land orientations. Meridians run from the north to the south poles, providing a stable framework for angular measurements and mapping. Meridians are fundamental in survey design, with the primary types being astronomic, magnetic, and assumed meridians. Each type offers distinct benefits and limitations, selected based on the project's scale and precision needs.The astronomic meridian is aligned with...
314
Diamagnetism01:26

Diamagnetism

2.4K
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
2.4K

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相关实验视频

Updated: Jun 11, 2025

Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement
09:43

Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement

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一种基于SQUID磁力计和磁梯度张量不变数的远程两点磁性定位方法.

Yingzi Zhang1, Gaigai Liu1, Chen Wang1

  • 1State Key Laboratory of Dynamic Measurement Technology, North University of China, Taiyuan 030051, China.

Sensors (Basel, Switzerland)
|September 28, 2024
PubMed
概括

使用SQUID传感器的新磁定位方法将检测范围扩展到500米. 这种先进的技术准确地以最小的误差定位目标,克服了现有的磁梯度张量 (MGT) 方法的局限性.

关键词:
磁性异常检测检测 磁性异常检测磁梯度张力器磁梯度张力器磁性定位的磁性定位超导量子干扰装置是一种超导量子干扰装置.

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相关实验视频

Last Updated: Jun 11, 2025

Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement
09:43

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Published on: November 7, 2017

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Magnetic Tweezers for the Measurement of Twist and Torque
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科学领域:

  • 物理 物理学 物理
  • 地质物理学 地质物理学
  • 传感器技术 传感器技术

背景情况:

  • 现有的双点磁梯度张差 (MGT) 定位方法仅限于2.5米的检测距离.
  • 这些方法需要先了解目标的磁矩向量,这种向量通常是未知的.
  • 实时,远程定位仍然是当前MGT技术面临的挑战.

研究的目的:

  • 开发一种新的两点磁位定位方法,用于远程和实时目标检测.
  • 为了克服现有的MGT定位系统的距离和未知的磁矩限制.
  • 增强干扰抑制能力,以提高定位准确度.

主要方法:

  • 使用自主开发的超灵敏超导量子干扰装置 (SQUID) 磁力计.
  • 在线定位模型中使用磁梯度张量 (MGT) 不变量.
  • 整合了一个准牛顿优化算法,用于先进的干扰抑制.

主要成果:

  • 模拟显示使用超导MGT系统的潜在检测距离为500m.
  • 拟议的方法在非盲区的相对定位误差显著低于1%,优于NSPT和XTPT方法.
  • 在10米距离的实验验证结果显示相对定位误差为4.5229%.

结论:

  • 拟议的基于SQUID的MGT定位方法在遥感能力方面取得了重大进展.
  • 该方法有效计算磁矩和相对位置向量,提高定位精度.
  • 它为实时,远距离的磁性目标定位提供了强大的解决方案,并提高了错误性能.