Electrostatic Distribution Measuring Instrument Using Carbon Nanotubes
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Solution Overview
Problem
Non-contact electrostatic distribution measuring instruments decay exponentially over time, limiting their ability to monitor electrostatic distributions effectively.
Innovation Solution
An electrometer with a sensing module using one-dimensional semiconducting linear structures, such as carbon nanotubes or graphene strips, that detect resistance changes caused by electrostatic charges without physical contact, allowing for sensitive and accurate measurement of electrostatic distributions by modulating the Fermi surface and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a non-contact instrument based on electrostatic induction is used, then measurement accuracy is improved and influence from input capacitance and input resistance is reduced, but the test value decays exponentially with time making it unable to monitor electrostatic distribution
Solution Approach 1:
The patent introduces an intermediary sensing structure consisting of conductive members arranged in a specific pattern that mediates between the electrostatic field and the measurement system. This intermediary structure transforms the electrostatic field information into measurable electrical signals without direct contact, thereby maintaining measurement accuracy while preventing exponential decay of test values over time.
Solution Approach 2:
The patent changes the physical parameters of the measurement system by using specific conductive materials with controlled electrical properties, arranging them in predetermined patterns. This parameter change enables the system to maintain stable measurements over time while preserving the non-contact measurement advantage.
2Stability of the object's composition
If a contact instrument is used, then stable measurement can be achieved, but the measurement is heavily influenced by input capacitance and input resistance reducing accuracy
Solution Approach 1:
The patent uses an intermediary sensing structure that combines elements of both contact and non-contact methods. The conductive members are positioned close to the measurement target without direct contact, acting as intermediaries that capture electrostatic field information while minimizing the influence of input capacitance and resistance, thus achieving both stability and accuracy.
Solution Approach 2:
The sensing system is segmented into multiple conductive members arranged in specific patterns. This segmentation allows the system to distribute the measurement function across multiple elements, reducing the impact of individual component parameters like capacitance and resistance on overall measurement accuracy while maintaining stability.
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 electrometer provides stable and accurate monitoring of electrostatic distributions by leveraging the high sensitivity of one-dimensional semiconducting structures to electrostatic fields, maintaining measurement accuracy over time.
Implementation Method 1
the non-contact instrument based on the principle of electrostatic induction is less influenced by input capacitance and input resistance
Implementation Method 2
detect resistance changes caused by electrostatic charges without physical contact, allowing for sensitive and accurate measurement of electrostatic distributions by modulating the Fermi surface and conductivity
Data Source
AI summary
An electrostatic distribution measuring instrument includes a sensing module and a control module. The sensing module includes a plurality of electrostatic sensing elements electrically insulated from each other. The plurality of electrostatic sensing elements is single walled carbon nanotubes or few-walled carbon nanotubes. The control module is coupled to the sensing module and configured to measure a resistance variation ΔR of the sensing module and convert the resistance variation ΔR into a static electricity potential.