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Related Concept Videos

Displacement Current01:19

Displacement Current

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Ampère's law, in its usual form, does not work in places where the current changes with time and is not steady. Thus, Maxwell suggested including an additional contribution, called the displacement current, Id, to the real conduction current I.
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Position and Displacement01:31

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The position of an object defines its location relative to a convenient frame of reference at any particular time. A frame of reference is an arbitrary set of axes from which the position and motion of an object are described. Earth is often used as a frame of reference, and we often describe the position of an object as it relates to stationary objects on Earth. For example, a rocket launch could be described in terms of the position of the rocket with respect to Earth as a whole. On the other...
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Passive Filters01:27

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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...
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Position and Displacement Vectors01:00

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To describe the motion of an object, one should first be able to describe its position (where it is at any particular time). More precisely, the position needs to be specified relative to a convenient frame of reference. A frame of reference is an arbitrary set of axes from which the position and motion of an object are described. Earth is often used as a frame of reference to describe the position of an object in relation to stationary objects on Earth.
Further, several important kinds of...
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Significance of Displacement Current01:27

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A displacement current is analogous to a real current in Ampère's law, participating in Ampère's law the same way as the usual conduction current. However, it is produced by a changing electric field. Displacement current is defined in terms of a time-varying electric field, and also has an associated displacement current density. By adding a term accounting for displacement current, Maxwell modified the existing Ampère's law, which is now called generalized Ampère's law.
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Angular Velocity and Displacement01:08

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Uniform circular motion is motion in a circle at a constant speed. Although this is the simplest case of rotational motion, it is very useful for many situations and is used to introduce rotational variables. When a particle is moving in a circle, the coordinate system is fixed and serves as a frame of reference to define the particle’s position. Its position vector from the origin of the circle to the particle sweeps out the angle θ, which increases in the counterclockwise direction...
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Related Experiment Video

Updated: Feb 9, 2026

Calibrated Passive Sampling - Multi-plot Field Measurements of NH3 Emissions with a Combination of Dynamic Tube Method and Passive Samplers
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A Novel Displacement and Tilt Detection Method Using Passive UHF RFID Technology.

Xiaozheng Lai1, Zhirong Cai2, Zeming Xie3

  • 1School of Computer Science & Engineering, South China University of Technology, Guangzhou 510006, China. laixz@scut.edu.cn.

Sensors (Basel, Switzerland)
|June 9, 2018
PubMed
Summary

This study introduces a low-cost method using passive Radio Frequency Identification (RFID) to monitor object displacement and tilt angle. The system achieves high accuracy, with displacement error under 2 mm and tilt angle error under 2.5 degrees.

Keywords:
antenna polarizationdisplacementradio frequency identification (RFID)tilt angleultrahigh frequency (UHF)

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Area of Science:

  • Wireless Sensor Networks
  • Radio Frequency Identification Technology
  • Object Monitoring Systems

Background:

  • Accurate monitoring of object displacement and tilt angle is crucial for various wireless applications.
  • Existing methods may be costly or complex, necessitating simpler, low-cost alternatives.
  • Passive Radio Frequency Identification (RFID) offers a potential low-cost solution for sensing physical parameters.

Purpose of the Study:

  • To propose and validate a novel, low-cost detection method for object displacement and tilt angle using passive RFID technology.
  • To demonstrate the effectiveness of different RFID antenna polarizations (linear and circular) for measuring displacement and tilt.
  • To quantify the accuracy of the proposed RFID-based sensing system.

Main Methods:

  • Utilized a standard ultra-high-frequency (UHF) RFID reader and passive RFID tags attached to the object.
  • Measured phase variations in the RFID tag's backscattered response to infer object movement.
  • Employed a linearly polarized (LP) reader antenna for accurate displacement detection.
  • Employed a circularly polarized (CP) reader antenna for accurate tilt angle detection, leveraging its linear relationship with phase.

Main Results:

  • The RFID system accurately detected object displacement using a linearly polarized antenna.
  • Object tilt angle was accurately determined using a circularly polarized antenna, correlating linearly with tag phase response.
  • Achieved a mean absolute error (MAE) of less than 2 mm for displacement.
  • Achieved a mean absolute error (MAE) of less than 2.5 degrees for tilt angle within a 500 mm working range.

Conclusions:

  • The proposed passive RFID-based method provides a low-cost and accurate solution for monitoring object displacement and tilt angle.
  • The distinct roles of linearly and circularly polarized antennas enable precise measurement of both parameters.
  • This technology holds promise for enhancing wireless monitoring applications where cost-effectiveness and accuracy are essential.