Non-Contact DC Loop Potential Sensing With Vibration Demodulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for measuring secondary DC loop potential face challenges such as weak electric field strength, difficulty in high-precision measurement, and susceptibility to interference from complex electromagnetic environments, temperature, humidity, and air pressure changes.
Innovation Solution
A non-contact micro intelligent sensing method that demodulates a weak AC current modulation signal using a demodulation circuit and amplifies it with a three-op-amp differential amplifier. This method includes a phase-sensitive detector and low-pass filter to eliminate noise and obtain a stable DC potential signal, which is then processed by a comprehensive computing module to correct for environmental factors and improve measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional contact-based measurement methods are used, then measurement can be performed, but DC short circuits, grounding, electric shock, and real-time monitoring difficulties occur
Solution Approach 1:
The patent replaces the mechanical contact-based measurement system with a non-contact electromagnetic sensing system. The sensing electrode detects DC potential through electromagnetic field coupling without physical contact, eliminating risks of electric shock and DC short circuits while enabling safe real-time monitoring
2Reliability
If non-contact measurement methods are used, then measurement safety is improved, but measurement precision deteriorates due to weak electric field strength
Solution Approach 1:
The patent applies periodic vibration to the sensing electrode to modulate the weak DC electric field signal into an AC signal. This vibration-based modulation technique amplifies the effective signal strength and enables precise measurement through frequency-domain separation, solving the precision problem while maintaining non-contact safety
Solution Approach 2:
The patent uses periodic vibration of the sensing electrode to create time-varying capacitance coupling with the measured conductor. This periodic action transforms the static DC field measurement into a dynamic AC signal that can be amplified and processed with high precision while maintaining electrical isolation
3Reliability
If non-contact measurement is implemented, then safety is improved, but environmental interference from temperature, humidity, and air pressure increases
Solution Approach 1:
The patent incorporates environmental sensors that detect temperature, humidity, and air pressure changes, and uses feedback compensation algorithms to correct measurement deviations caused by these environmental factors. This feedback mechanism maintains measurement accuracy while preserving the safety benefits of non-contact measurement
Solution Approach 2:
The patent compensates for environmental interference by dynamically adjusting measurement parameters based on detected environmental conditions. The system changes operating parameters such as vibration frequency and amplification gain to counteract the effects of temperature, humidity, and air pressure variations, maintaining precision despite environmental changes
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method achieves high measurement accuracy, stability, and adaptability to varying environmental conditions, reducing power consumption and operation and maintenance costs while providing strong anti-interference capabilities.
Implementation Method 1
the vibration capacitor generates an alternating capacitance in the static DC electric field
Implementation Method 2
the induction electrode plate vibrates in the static DC electric field to be measured, so as to generate an alternating capacitance
Implementation Method 3
the Lorentz force driver is used to drive the induction electrode plate to vibrate
Implementation Method 4
demodulating a weak AC current modulation signal through a demodulation circuit
Implementation Method 5
amplifying the weak AC current modulation signal by a three-op-amp differential amplifier
Implementation Method 6
passing the potential signal through a phase-sensitive detector to eliminate noise signals at non-driving frequencies
Implementation Method 7
in which the noise-removed potential signal is filtered out by a low-pass filter to filter out the AC signal to obtain a stable DC potential signal
Data Source
AI summary
A method and a system for optimization to non-contact micro intelligent sensing in secondary DC loop potential are provided, including demodulating a weak AC current modulation signal through a demodulation circuit and amplifying the weak AC current modulation signal; amplifying the weak AC current modulation signal to output a stable and amplified measurable potential signal; processing the potential signal for noise to obtain a stable DC potential signal; inputting the DC potential signal to a comprehensive computing module for analysis and processing; using micro sensors to measure information. The measured potential results are input to the comprehensive computing module to analyze and correct, and the measurement results are output to the communication module for external output. The equipment is packaged to form a potential collection “probe” and a potential measurement “unit”. The potential measurement “unit” supports multiple potential collection “probes” for accessing.