Capacitive Rotary Joint Multiplexing for High-Rate Data Transfer
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Solution Overview
Problem
Existing rotary joint systems for CT scanners face challenges in achieving high data rates with low data losses and reliable diagnostics, particularly in complex systems with multiple data transmission links, where misalignment and defects lead to static and dynamic errors, complicating service and commissioning.
Innovation Solution
A rotating capacitive data link system with multiple transmission line segments and receiving couplers, combined with a multiplexing scheme, includes a transmit and receive signal processor for encoding and error correction, and a status matrix for real-time diagnostics to identify misalignments and defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple capacitive links are combined with rotation angle dependent multiplexing scheme to increase data transmission bandwidth, then data transmission rate is improved, but system complexity increases
Solution Approach 1:
The circular transmission lines are divided into multiple transmission line segments (at least two segments per circular transmission line), with each segment connected to a transmitter. This segmentation allows the system to achieve higher data transmission rates by providing multiple parallel capacitive links while maintaining manageable system complexity through modular structure.
Solution Approach 2:
The system implements rotation angle dependent multiplexing where the assignment of receiving couplers to transmission line segments changes dynamically with the rotation angle. This dynamic multiplexing scheme allows the system to optimize data transmission bandwidth by adapting the signal paths based on the relative rotational position between the first and second bodies.
2Productivity
If multiple data transmitter and receiver components are used to achieve high data rates, then data transmission bandwidth is improved, but difficulty in identifying misalignment and defective components increases
Solution Approach 1:
The system incorporates a status matrix that provides real-time feedback on the operational status of each transmission line segment and receiving coupler combination. This feedback mechanism enables precise identification of misaligned or defective components by monitoring signal quality and transmission performance across all capacitive links, facilitating targeted maintenance without requiring system shutdown or complex diagnostic procedures.
3Measurement precision
If existing diagnosis methods are used for single errors in single transmission link, then single component errors can be identified, but they are of limited benefit in complex systems with multiple transmitters and receivers that generate parallel multiplexed data transmission links
Solution Approach 1:
The status matrix serves as a universal diagnostic tool that can identify and locate errors across all transmission line segments and receiving couplers simultaneously. It provides a comprehensive view of the entire multiplexed system's health, adapting to various error conditions including misalignment, defective components, and signal quality issues across all parallel data transmission links, rather than being limited to single-link diagnostics.
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
Ensures high data transmission bandwidth with low losses and reliable diagnostics, allowing for efficient service and maintenance by identifying defective components without increasing system size, and facilitating easy commissioning.
Implementation Method 1
high density rotary joint for contactless data transfer based on capacitive coupling technology
Data Source
AI summary
A rotating capacitive data link system includes a first body rotatable relative to a second body. The first body has one or multiple circular signal transmission lines with multiple transmission line segments. The second body has multiple circular arranged sets of receiving couplers with multiple receiving couplers. Each of the sets of receiving couplers matches to one of the circular signal transmission lines, such that depending on the relative rotational position or angle between the first body and the second body multiple capacitively coupled paths between the transmission line segments and the receiving couplers of a matching set of receiving couplers exist. A receive signal processor is provided to generate a detailed error or status matrix of transmission errors.