Multi-Channel Data Acquisition via Optical Fiber Segmentation
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Solution Overview
Problem
Existing data acquisition systems for multi-channel signals face issues with noise interference and increased complexity and cost due to the large number of wires and DAQ boards required, which also lead to decreased channel-specific sampling time.
Innovation Solution
A system that uses channel-voltage transmission modules with optical fiber cables to convert voltage signals from multiple channels into serial digital signals, which are then transmitted outside a shield room, reducing noise and complexity by utilizing a serial-to-parallel conversion module and DIO board for data storage, allowing for efficient high-speed data acquisition without external noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple DAQ boards are used to increase the number of channels, then the number of acquisition channels is improved, but the device complexity and cost increase
Solution Approach 1:
The system divides the 256 channels into 16 groups, with each group handled by a separate transmission module. Each module processes 16 channels independently, converting them to serial digital signals. This segmentation allows the system to scale to high channel counts while maintaining manageable complexity within each module.
Solution Approach 2:
Multiple transmission modules are combined and connected to a single computer system through optical fiber cables. The modules work in parallel, with their outputs merged at the computer level, reducing the need for multiple separate DAQ boards and simplifying the overall system architecture.
2Adaptability or versatility
If multiple DAQ boards are used to increase the number of channels, then the number of acquisition channels is improved, but the cost increases
Solution Approach 1:
Each transmission module is designed as a universal unit that can handle multiple channels (16 channels per module). These modules can be replicated and combined to achieve different total channel counts, providing flexibility without requiring custom designs for each channel configuration.
Solution Approach 2:
The system replaces traditional electrical connection systems with optical fiber cable connections. This substitution eliminates the need for numerous electrical wires and reduces interference, while the modular design allows cost-effective scaling by adding identical modules rather than complex custom wiring.
3Adaptability or versatility
If the number of wires is increased to support more channels, then the number of acquisition channels is improved, but noise interference increases
Solution Approach 1:
The system replaces electrical signal transmission through wires with optical signal transmission through optical fiber cables. This substitution eliminates electromagnetic interference and ground loops that cause noise, while maintaining the ability to transmit signals from multiple channels simultaneously.
Solution Approach 2:
Optical fiber cables serve as an intermediary medium between the transmission modules inside the shielded room and the computer outside. This intermediary converts electrical signals to optical signals for transmission, blocking external electromagnetic noise while preserving signal integrity.
4Adaptability or versatility
If multiple DAQ boards are used to increase the number of channels, then the number of acquisition channels is improved, but the channel-specific sampling time decreases
Solution Approach 1:
By dividing channels into groups handled by dedicated transmission modules, each module can process its 16 channels with sufficient sampling time. The segmentation prevents the sampling time from being divided across too many concurrent operations, maintaining adequate resolution per channel even as total channel count increases.
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 system effectively transmits multi-channel signals at high speed with reduced noise and complexity, maintaining sampling time and reducing additional production costs, even when increasing the number of channels, by using optical fiber cables and modular components.
Implementation Method 1
transmits a multi-channel signal measured in a shield room to the outside of the shield room at high speed without external noise
Data Source
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AI summary
A system and method for acquiring data of a multi-channel signal are provided. The system includes a channel-voltage transmission module disposed in a shield room blocking electromagnetic waves, connected with a plurality of channels from which analog signals are output, and configured to generate a serial digital signal having information about an analog signal and information about a channel from which the analog signal is output, and an optical fiber cable through which the serial digital signal is transmitted from the channel-voltage transmission module to the outside of the shield room.