Multi-Pulse Time-Domain Reflectometry for Short Discontinuities
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current time-domain reflectometry systems have limited resolution, making it difficult to detect discontinuities on transmission lines that are shorter than the rise time of the TDR pulse.
Innovation Solution
The method involves transmitting two separate pulses onto a transmission line with controlled delays, capturing and measuring reflections, and analyzing derivative curves, particularly third derivative curves, to identify and calculate the location and length of discontinuities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single pulse is transmitted in conventional TDR, then the measurement process is simple and fast, but the resolution is limited and cannot detect discontinuities shorter than the pulse rise time
Solution Approach 1:
The invention segments the measurement process by transmitting multiple pulses with different delays instead of a single pulse. Each pulse generates a waveform that samples the transmission line at different time points. By dividing the measurement into multiple segmented waveforms and processing them through derivative calculations, the system achieves resolution beyond the single pulse rise time limitation.
Solution Approach 2:
The invention employs periodic action by transmitting a series of pulses at different delays in a systematic sequence. Each pulse is transmitted after a controlled delay period, creating a periodic sampling pattern across the transmission line. This periodic multi-pulse approach allows the system to build up resolution through cumulative waveform analysis.
2Measurement precision
If multiple pulses with different delays are transmitted, then the resolution is enhanced to detect shorter discontinuities, but the measurement time and processing complexity increase
Solution Approach 1:
The invention applies preliminary action by pre-calculating and storing multiple waveforms with different delay values before the actual measurement. The derivative curves are pre-computed for each waveform, allowing the measurement process to quickly reference and compare pre-prepared data rather than performing complex calculations in real-time during measurement.
Solution Approach 2:
The invention transitions from analyzing a single time-domain waveform to analyzing multiple waveforms across an additional dimension of delay values. By introducing the delay dimension and creating a multi-dimensional waveform space, the system can extract discontinuity information that is not visible in any single waveform, effectively trading measurement time for enhanced detection capability.
3Measurement precision
If third derivative curves are calculated for multiple waveforms, then the length of discontinuities can be accurately calculated, but the computational complexity increases
Solution Approach 1:
The invention applies self-service by designing the measurement system to automatically perform the complex derivative calculations and discontinuity length determinations without requiring external intervention. The system self-processes the multiple waveforms, computes the third derivatives, identifies characteristic points, and calculates discontinuity lengths autonomously, making the computational complexity an internal function of the measurement device itself.
Solution Approach 2:
The invention replaces manual or simplified analysis methods with automated computational processing. Instead of using simple waveform comparison or visual inspection, the system substitutes mechanical/manual analysis with electronic computation of higher-order derivatives and algorithmic identification of discontinuity characteristics, achieving higher precision through computational power.
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
Enhances the resolution of time-domain reflectometry by accurately detecting and measuring discontinuities that are shorter than the rise time of the pulse, overcoming the limitations of existing systems.
Implementation Method 1
transmitting a first pulse on a transmission line, transmitting a second pulse on the transmission line
Implementation Method 2
capturing and measuring reflections of the transmitted pulses
Data Source
AI summary
Computer-implemented methods for performing enhanced resolution time-domain reflectometry are provided. Aspects include obtaining a plurality of waveforms by transmitting a first pulse on a transmission line, transmitting a second pulse on the transmission line, where the second pulse is transmitted after the first pulse by a delay, and capturing and measuring reflections of the transmitted pulses, wherein the delay corresponding to each of the plurality of waveforms is different. Aspects also include identifying a discontinuity of the transmission line based at least in part on the plurality of waveforms. Based on a determination that the transmission line includes the discontinuity, aspects include calculating third derivative curves for each of the plurality of waveforms and calculating a length of the discontinuity of the transmission line based on the third derivative curves. Aspects also include creating a notification indicating a location and the length of the discontinuity of the transmission line.