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相关概念视频

Magnetic Damping01:17

Magnetic Damping

489
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
489
Passive Filters01:27

Passive Filters

561
Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
561
Time and frequency -Domain Interpretation of PI Control01:27

Time and frequency -Domain Interpretation of PI Control

157
Proportional-Integral (PI) controllers are essential in many control systems to improve stability and performance. They are commonly used in everyday devices like thermostats to enhance system damping and reduce steady-state error. When the zero in the controller's transfer function is optimally placed, the system benefits significantly in terms of stability and accuracy.
Acting as a low-pass filter, the PI controller slows the system's response and extends settling times. This requires...
157
Induction01:16

Induction

4.1K
An emf is induced when the magnetic field in a coil is changed by pushing a bar magnet into or out of the coil. emfs of opposite signs are produced by motion in opposite directions, and the directions of emfs are also reversed by reversing poles. The same results are produced if the coil is moved rather than the magnet—it is the relative motion that is important. The faster the motion, the greater the emf. Additionally, there is no emf when the magnet is stationary relative to the coil.
A...
4.1K
Faraday's Law01:10

Faraday's Law

4.2K
Faraday's law state that the induced emf is the negative change in the magnetic flux per unit of time. Any change in the magnetic field or change in the orientation of the area of the coil with respect to the magnetic field induces a voltage (emf). The magnetic flux measures the number of magnetic field lines through a given surface area. Magnetic flux is estimated from the integral of the dot product of the magnetic field vector and the area vector. The negative sign describes the...
4.2K
Induced Electric Fields: Applications01:27

Induced Electric Fields: Applications

1.7K
An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
1.7K

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相关实验视频

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High-precision Electromagnetic Flowmeter with Empty Pipe Detection via Complex Programmable Logic Device-based Waveform Recognition
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High-precision Electromagnetic Flowmeter with Empty Pipe Detection via Complex Programmable Logic Device-based Waveform Recognition

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低通波器用于用于电磁感应系统的温度偏移纠正方法.

Martial Tazifor Tchantcho1, Egon Zimmermann1, Johan Alexander Huisman2

  • 1Central Institute of Engineering, Electronics and Analytics (ZEA-2), Forschungszentrum Juelich GmbH, 52428 Juelich, Germany.

Sensors (Basel, Switzerland)
|September 9, 2023
PubMed
概括

本研究引入了一种新方法,使用两个低通波器来纠正电磁感应 (EMI) 系统中的温度漂移,提高土壤电导率 (ECa) 数据的准确性.

关键词:
显而易见的电导率 (ECa)电磁感应 (EMI) 是一种电磁感应.温度偏移纠正温度偏移纠正

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Near-Infrared Temperature Measurement Technique for Water Surrounding an Induction-heated Small Magnetic Sphere
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科学领域:

  • 地质物理学 地质物理学
  • 环境科学 环境科学
  • 仪器化 仪器化 仪器化

背景情况:

  • 电磁感应 (EMI) 系统对于在近表面应用中绘制土壤电导率 (ECa) 是至关重要的.
  • 温度波动显著影响EMI测量的稳定性和可靠性,需要有效的偏移校正.
  • 现有的静态漂移校正方法无法解决仪表组件中延迟的热变化.

研究的目的:

  • 开发和验证EMI系统的新型漂移校正方法,以解释延迟的热变化.
  • 提高受温度漂移影响的ECa测量的准确性和可靠性.
  • 评估两种低通波器 (LPF) 模型与单一LPF和静态校正方法的有效性.

主要方法:

  • 用一个配有八个温度传感器的定制EMI设备进行测量,温度范围为10°C至50°C.
  • 开发了一种包含两个LPF的漂移校正模型,以考虑系统组件的延迟热反应.
  • 混合复杂演化 (SCE-UA) 全球优化算法用于高效的校准参数估计.

主要成果:

  • 拟议的双LPF漂移模型在单个测量中实现了根平均平方误差 (RMSE) <1 mSm−1.
  • 在所有数据集中同时进行漂移校正,产生了<1.2 mSm-1的RMSE,明显优于单个LPF校正 (高达4.5 mSm-1).
  • 该模型有效地描述了在不同温度条件下EMI测量装置的漂移行为.

结论:

  • 本文介绍的双LPF漂移校正方法准确地减轻了EMI系统中温度诱导的漂移.
  • 这种先进的方法提高了土壤电导率测绘的可靠性和准确性.
  • 这些发现表明,在动态热环境中,双LPF模型在稳健的ECa数据采集方面具有优越性.