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相关概念视频

Equipments Used to Measure Body Temperature01:13

Equipments Used to Measure Body Temperature

951
Body temperature can be assessed using various devices and measured in Celsius or Fahrenheit.
Glass-bulb Thermometer:
Glass-bulb thermometers are hollow glass tubes with a bulb tip containing liquid such as ethanol or mercury. Historically, glass bulb mercury thermometers were the standard device to measure body temperature. Today, mercury thermometers are prohibited in many countries due to the hazardous effects of mercury and the risk of exposure if the glass bulb breaks. In general,...
951
Ferromagnetism01:31

Ferromagnetism

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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
2.4K
Galvanometer01:25

Galvanometer

2.1K
Common devices, including car instrument panels, battery chargers, and inexpensive electrical instruments, measure potential difference (voltage), current, or resistance using a d'Arsonval galvanometer. This electromechanical instrument is also known as a moving coil galvanometer.
The galvanometer consists of  two concave-shaped permanent magnets, providing a uniform radial magnetic field in the annular region. In the center, a pivoted coil of fine copper wire is placed in the uniform...
2.1K
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

934
In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
934
Magnetic Damping01:17

Magnetic Damping

415
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...
415
Assessing Body Temperature - Tympanic membrane01:14

Assessing Body Temperature - Tympanic membrane

562
Assessing tympanic membrane temperature involves using a tympanic membrane thermometer (TMT). Here is a step-by-step guide:
Step 1: Begin by practicing good hand hygiene to prevent the transmission of microorganisms.
Step 2: Turn on the thermometer and wait until the ready sign appears on the screen to ensure accurate measurement.
Step 3: Slide the probe cover in place to prevent cross-contamination.
Step 4: Instruct the patient to tilt their head to the side for comfort and check for cerumen...
562

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相关实验视频

Updated: May 28, 2025

A Simple Approach to Perform TEER Measurements Using a Self-Made Volt-Amperemeter with Programmable Output Frequency
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基于磁电复合材料的宽温度范围计.

Boyu Xin1, Qianshi Zhang1, Lizhi Hu2

  • 1Key Laboratory of Polar Materials and Devices (MOE), Shanghai Center of Brain-Inspired Intelligent Materials and Devices, Department of Electronics, East China Normal University, Shanghai 200241, China.

Sensors (Basel, Switzerland)
|February 13, 2025
PubMed
概括

使用Metglas/PZT/Metglas复合材料的新型磁电 (ME) 计程表实现了高精度的旋转速度测量. 该设备在极端温度 (-70°C至160°C) 中可靠运行,具有出色的抗干扰能力.

关键词:
感应极端温度的传感器电磁复合材料是一种电磁复合材料.旋转速度测量仪计时器计时器的时间表.

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Quantifying the Relative Thickness of Conductive Ferromagnetic Materials Using Detector Coil-Based Pulsed Eddy Current Sensors
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科学领域:

  • 材料科学 材料科学 材料科学
  • 传感器技术 传感器技术
  • 物理 物理学 物理

背景情况:

  • 传统的计时器在极端温度环境中面临限制.
  • 磁电 (ME) 复合材料为强大的传感器应用提供了潜力.
  • 开发适用于恶劣工业环境的传感器对于精确的监测至关重要.

研究的目的:

  • 开发和描述使用Metglas/PZT/Metglas磁电复合材料的高精度计时器.
  • 为了评估ME计时器在广泛的温度范围内 (-70°C至160°C) 的运行稳定性和准确性.
  • 在各种环境条件和频率下研究ME反应特征.

主要方法:

  • 一个Metglas/PZT/Metglas ME复合传感器的制造.
  • 使用COMSOL多物理模拟分析来建模ME反应.
  • 在不同频率,直流偏差和温度下对ME系数进行系统的实验研究.
  • 使用直流电机设置进行性能评估,以模拟从480到1260rpm的旋转速度.

主要成果:

  • 速度计ME表现出高的测量精度,与480-1260rpm范围内的设置值密切匹配.
  • ME系数在-70°C至160°C之间表现出良好的规律性和稳定性,与模拟结果保持一致.
  • 计时器在高温环境中保持了高信号噪声比 (SNR) 和出色的抗干扰能力.

结论:

  • 开发的Metglas/PZT/Metglas ME计时器适用于在极端温度条件下高精度旋转速度测量.
  • 传感器在广泛的操作温度范围内表现出可靠的性能,准确性和稳定性.
  • 这种ME计时表显示出在要求苛刻的工业环境中应用的巨大潜力,需要强大而精确的测量解决方案.