Shielded Conductor Current Measurement for X-Ray Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for measuring current in high-voltage x-ray systems are inconvenient and prone to errors due to the difficulty in accurately measuring cable charge current without adding cost or complexity, especially when rapid voltage changes are required.
Innovation Solution
A measurement system with shielded wires connected between the high voltage source and the x-ray system, including a measurement resistor at high voltage potential, which minimizes capacitive current interference and allows accurate current measurement by keeping the shielding at the same high voltage potential as the filament wires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional cable charge current measurement methods are used, then current measurement can be performed, but measurement precision deteriorates due to capacitive current interference
Solution Approach 1:
The shielding is connected to the high voltage potential, creating an equipotential environment around the measurement wires. This eliminates potential differences between the shielding and the high voltage conductors, thereby eliminating capacitive current flow and improving measurement accuracy.
Solution Approach 2:
A measurement resistor is introduced as an intermediary element connected between the shielding and one of the wires. This resistor provides a controlled path for current measurement while the shielding acts as an intermediary structure that maintains equipotential conditions, isolating the measurement from capacitive interference.
2Speed
If fast voltage transitions are implemented, then system responsiveness improves, but measurement reliability deteriorates due to increased capacitive effects
Solution Approach 1:
By maintaining the shielding at high voltage potential throughout rapid voltage transitions, the system preserves equipotential conditions even during fast changes. This ensures that capacitive currents remain negligible regardless of the speed of voltage transitions, maintaining measurement reliability.
3Measurement precision
If shielded measurement system is implemented, then measurement precision improves, but device complexity increases
Solution Approach 1:
The measurement system is segmented into distinct functional components: shielded wires for signal transmission, high voltage shielding for interference protection, and a measurement resistor for current sensing. This modular segmentation allows each component to perform its specific function efficiently while keeping the overall system manageable.
Solution Approach 2:
The shielding structure serves multiple functions simultaneously: it provides electromagnetic shielding, maintains equipotential conditions, and serves as a reference potential for the measurement resistor. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
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
Enables accurate measurement of tube current even during rapid voltage changes, reducing capacitive current influence and ensuring reliable control of electron beam intensity and energy in x-ray systems.
Implementation Method 1
A measurement system with shielded wires connected between the high voltage source and the x-ray system, including a measurement resistor at high voltage potential, which minimizes capacitive current interference
Data Source
AI summary
Systems and methods for measuring current with shielded conductors are provided. One system includes a first wire within shielding, wherein the first wire is connected between a high voltage source and a filament of an x-ray system. The system also includes a second wire within shielding, wherein the second wire is connected between the high voltage source and the x-ray system and the shielding of the first and second wires is at a high voltage potential of the x-ray system. The system further includes a measurement resistor at a high voltage potential, wherein the measurement resistor is connected between the shielding and one of the first or second wires.