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Related Concept Videos

Parallel Resonance01:23

Parallel Resonance

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The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
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Double Resonance Techniques: Overview01:12

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Characteristics of Series Resonant Circuit01:24

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Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
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Concept of Resonance and its Characteristics01:19

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If a driven oscillator needs to resonate at a specific frequency, then very light damping is required. An example of light damping includes playing piano strings and many other musical instruments. Conversely, to achieve small-amplitude oscillations as in a car's suspension system, heavy damping is required. Heavy damping reduces the amplitude, but the tradeoff is that the system responds at more frequencies. Speed bumps and gravel roads prove that even a car's suspension system is not...
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Consider designing an oscillator circuit, a crucial component in various electronic devices and systems. The objective is to create an oscillator circuit with specific characteristics: a damped natural frequency of 4 kHz and a damping factor of 4 radians per second. To accomplish this, a parallel RLC circuit is employed, known for its ability to sustain oscillations at a resonant frequency. In this case, the damping factor is pivotal in achieving the desired performance.
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Related Experiment Video

Updated: Jun 25, 2025

Construction of a Wireless-Enabled Endoscopically Implantable Sensor for pH Monitoring with Zero-Bias Schottky Diode-based Receiver
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Passive Wireless Partial Discharge Sensors with Multiple Resonances.

Zhenheng Xu1,2, Bing Tian2, Shiqi Guo1

  • 1Key Laboratory of MEMS of the Ministry of Education, School of Electronic Science & Engineering, Southeast University, Nanjing 210096, China.

Micromachines
|May 25, 2024
PubMed
Summary
This summary is machine-generated.

This study presents a novel passive wireless sensor for detecting partial discharge (PD) in Gas-Insulated Switchgear (GIS). The new sensor offers enhanced sensitivity and a high signal-to-noise ratio, improving PD detection accuracy.

Keywords:
inductor–capacitor sensormulti-resonantpartial discharge detectionwireless sensing

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Area of Science:

  • Electrical Engineering
  • Materials Science
  • Physics

Background:

  • Partial discharge (PD) is a primary defect in Gas-Insulated Switchgear (GIS) insulation.
  • Current PD detection methods, such as wired antennas or external UHF antennas, have limitations including destructive installation and poor anti-interference capabilities.
  • There is a need for non-invasive, highly sensitive PD detection methods for GIS.

Purpose of the Study:

  • To develop and evaluate a novel passive wireless sensor for detecting PD within GIS.
  • To enhance PD detection sensitivity and signal-to-noise ratio (SNR) compared to existing methods.
  • To validate the accuracy and effectiveness of the proposed sensor through experimental benchmarking.

Main Methods:

  • A passive wireless PD sensor utilizing a multi-resonant sheeting branch-inductor was designed and implanted inside GIS on an observation window.
  • A coaxially aligned external readout circuit was used to wirelessly interrogate the sensor and obtain PD signals.
  • Experimental validation involved benchmarking the proposed sensor against a commercial UHF sensor in a controlled laboratory setting.
  • Wireless calibration tests were conducted to assess the precision of PD signal measurements.

Main Results:

  • The proposed multi-resonant sensor demonstrated a 2.5-times enhancement in signal strength compared to a commercial UHF sensor.
  • A high signal-to-noise ratio (SNR) of 68.82 dB was achieved due to the internal implantation of the sensor.
  • The wireless calibration test showed a high signal test precision of 0.72 pC.
  • Phase-resolved partial discharge (PRPD) patterns were successfully obtained, demonstrating the sensor's capability to capture PD characteristics.

Conclusions:

  • The developed passive wireless PD sensor offers a non-disruptive and highly effective solution for PD detection in GIS.
  • The sensor's multi-resonant design significantly enhances detection sensitivity and signal quality.
  • The experimental results confirm the proposed method's superior performance, high SNR, and accuracy in PD monitoring applications.