Measurement Signal Processing for DC Component Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current measurement probes, such as Rogowski current probes, are unable to detect DC signals, resulting in incomplete measurement data when processing signals from devices under test, as they only provide relative current information without indicating the existing DC portion of the measured signal.
Innovation Solution
A method and apparatus that acquire and compare measurement signals with predefined signal characteristics to adjust waveforms, allowing for the compensation of probe limitations by incorporating system knowledge about the device under test, such as specific signal values or patterns, to display a complete signal trace including DC components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a Rogowski current probe is used to measure current signals, then the probe can detect AC current components, but the DC portion of the measured signal cannot be detected
Solution Approach 1:
The patent introduces a second probe with different measurement characteristics as an intermediary device. This second probe can detect DC components that the first Rogowski probe cannot detect. By combining the measurements from both probes, the system recovers the complete current signal including both AC and DC portions, thus using an intermediary to overcome the limitation of the primary measurement device
Solution Approach 2:
The patent makes the measurement system multi-functional by employing multiple probes with different capabilities. The first probe measures AC components while the second probe measures DC components. The measurement apparatus is configured to process signals from both probes simultaneously, making the overall system capable of measuring both AC and DC current components, thereby achieving universality in current measurement
2Device complexity
If only a single probe is used for measurement, then the measurement setup is simple, but the measurement is incomplete without DC portion indication
Solution Approach 1:
The patent merges the functionality of multiple probes into a single integrated measurement system. The apparatus combines signals from the first Rogowski probe (detecting AC components) and the second probe (detecting DC components) through signal processing circuits. This merging allows the system to achieve complete current measurement (both AC and DC) while presenting a unified, integrated measurement solution that manages complexity through systematic integration
3Ease of operation
If the measurement apparatus displays only relative current information, then the display is straightforward, but the user cannot see the DC portion of the measured signal
Solution Approach 1:
The patent uses signal processing circuits as intermediaries between the probes and the display unit. These circuits process the raw signals from both probes, combine the AC and DC components, and generate a composite waveform that represents the complete current signal. This intermediary processing layer translates the combined measurement data into a display format that maintains simplicity while revealing the previously invisible DC portion of the signal
Data Source
AI summary
A method for and apparatus processing a measurement signal of a dynamic physical quantity is provided which includes acquiring a measurement signal representing the dynamic physical quantity over time; comparing the acquired measurement signal with a predefined signal characteristic of the respective physical quantity or with a signal characteristic of another physical quantity being dependent from the respective physical quantity to provide a comparison result; and adjusting a waveform representing the acquired measurement signal based upon the comparison result. A digital oscilloscope is also provided.