X-Ray Carrier Detection for Low-Mobility Insulating Materials
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Solution Overview
Problem
Existing measurement methods for low carrier mobility in insulating materials suffer from insufficient sensitivity and accuracy, hindering the development and application of high-performance insulating materials due to weak current changes.
Innovation Solution
A detection method combining X-ray excitation with voltage signal analysis, using a triangular wave voltage and an X-ray source to generate and drive carriers within the insulating material, followed by current signal acquisition and calculation to determine carrier mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional measurement methods are used for insulating materials with low carrier mobility, then the measurement process is simple, but the sensitivity and accuracy are insufficient due to weak current changes
Solution Approach 1:
The patent applies preliminary action by using X-ray irradiation to pre-generate carriers in the insulating material before the actual measurement. This preliminary carrier generation ensures that there are sufficient carriers available for measurement, overcoming the problem of weak current changes in materials with low carrier mobility. The X-ray irradiation is performed as a preparatory step to populate the material with carriers that can then be measured under applied voltage.
Solution Approach 2:
The patent introduces an intermediary substance (X-ray) to facilitate the measurement process. The X-ray acts as a mediator that converts electromagnetic energy into carrier generation, indirectly enabling the measurement of carrier mobility. This intermediary approach allows the measurement system to detect carrier behavior without directly interacting with the low-mobility carriers themselves, thereby improving measurement sensitivity and accuracy.
2Measurement precision
If X-ray excitation with voltage signal analysis is used, then sensitivity and accuracy are improved, but the device complexity increases
Solution Approach 1:
The patent employs periodic action by using a triangular wave voltage signal with a specific frequency (0.1-10 Hz) to drive the carriers. This periodic voltage application creates a time-varying electric field that modulates carrier motion, generating detectable current signals. The periodic nature of the voltage signal allows for synchronized detection and signal processing, improving measurement accuracy while managing system complexity through frequency-based control.
Solution Approach 2:
The patent replaces direct mechanical or electrical measurement approaches with an optical/electromagnetic-based method. Instead of using complex electrical probes or mechanical measurement systems, the invention uses X-ray excitation combined with voltage signal analysis. This substitution of measurement methodology reduces mechanical complexity while enhancing sensitivity through electromagnetic interaction with the carriers.
3Measurement precision
If the amplitude of triangular wave voltage is set to 70% of rated breakdown voltage, then carrier mobility measurement accuracy is improved, but the risk of sample breakdown increases
Solution Approach 1:
The patent applies partial action by using a voltage amplitude (70% of rated breakdown voltage) that is sufficient to drive carriers for accurate measurement but deliberately kept below the breakdown threshold. This partial application of voltage ensures adequate carrier motion for detection while maintaining a safety margin that prevents sample breakdown. The 70% level provides an optimal balance between measurement sensitivity and sample protection.
Solution Approach 2:
The patent implements beforehand cushioning by setting the voltage amplitude at 70% of the rated breakdown voltage, which creates a protective buffer or safety margin before the actual breakdown point is reached. This pre-established cushion prevents accidental sample damage while still providing sufficient electric field strength for accurate carrier mobility measurement. The buffer zone allows for measurement optimization without compromising sample integrity.
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 sensitivity and accuracy in measuring carrier mobility, enabling reliable data for material assessment and promoting the development of high-performance insulating materials.
Implementation Method 1
irradiating the sample by using an X-ray to generate carriers inside the sample
Implementation Method 2
driving the carriers to move under an action of the triangular wave voltage
Data Source
AI summary
A detection method and device for low carrier mobility of an insulating material, relating to a technical field of electrical property testing of insulating polymer materials, includes following steps: fixing a sample; applying a triangular wave voltage to both ends of the sample; irradiating the sample by an X-ray to generate carriers inside the sample, in which, the carriers is driven to move under an action of the triangular wave voltage, and an irradiation process of the X-ray coincides with a rising phase of the triangular wave voltage; acquiring a current signal of the sample under the action of the triangular wave voltage; and calculating a carrier mobility based on the current signal. The detection method and device for low carrier mobility of the insulating material achieves accurate detection of behaviors of the carriers inside the insulating material by combining X-ray excitation with voltage signal analysis.