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Exploring on the Sensitivity Changes of the LC Resonance Magnetic Sensors Affected by Superposed Ringing Signals
Tingting Lin1,2, Kun Zhou3,4, Sijia Yu5,6
1College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130061, China. ttlin@jlu.edu.cn.
Sensors (Basel, Switzerland)
|April 26, 2018
Summary
LC resonance magnetic sensors are sensitive but prone to environmental noise. Adjusting the sensor
Area of Science:
- Physics and Engineering
- Magnetic Sensing Technology
Background:
- LC resonance magnetic sensors offer high sensitivity for low-field nuclear magnetic resonance (LF-NMR) and surface nuclear magnetic resonance (SNMR).
- Environmental interference significantly increases the magnetic field noise of these sensors, reducing signal-to-noise ratios (SNRs) in practical applications.
- Ringing, an inherent characteristic of LC sensors, exacerbates white noise levels when environmental interference is present.
Purpose of the Study:
- To investigate the cause of increased noise in unshielded environments for LC resonance magnetic sensors.
- To propose a method for optimizing LC sensor performance across different environmental conditions.
- To enhance the sensitivity and SNR of LC sensors for improved NMR detection.
Main Methods:
- Analyzed noise levels of LC resonance magnetic sensors and Hall sensors in various environments.
- Conducted experiments and simulations to understand the impact of environmental interference on sensor noise.
- Proposed a method to adjust the quality factor (Q) of LC sensors using matching resistors to optimize sensitivity.
Main Results:
- Environmental interference increases white noise in LC sensors due to superposed ringing.
- Matching resistors were used to adjust the sensor's quality factor (Q) for optimal sensitivity in different environments.
- An LF-NMR experiment demonstrated a significant SNR improvement (3.46x) by selecting the best-performing LC sensor configuration.
Conclusions:
- The study identifies ringing as the cause of increased noise in LC sensors under environmental interference.
- Adjusting the quality factor (Q) of LC sensors with matching resistors effectively mitigates noise and enhances SNR.
- This method improves the applicability of LC resonance magnetic sensors for NMR detection in diverse environments.
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