Isolated Sensor Interface Using Clock Modulation for Noise-Robust Data
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Solution Overview
Problem
In measurement data acquisition systems, transmitting analog signals over long distances leads to distortion and noise, and harsh electrical conditions require significant engineering effort to maintain effective communication between sensor and control units.
Innovation Solution
A method and interface for a measurement system that modulates a clock signal to convey control information across an electrical barrier, allowing efficient communication between sensor and control units while maintaining stability and reducing noise, using techniques like Sigma-Delta modulation and UART protocol.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If analog measurement signals are transmitted over long distances, then the sensor unit can be positioned remotely from the processing device, but the signal becomes distorted and deteriorated due to damping and noise
Solution Approach 1:
An isolated interface unit acts as an intermediary between the sensor unit and processing device. This interface converts analog signals to digital signals and provides electrical isolation, enabling long-distance transmission while maintaining signal integrity by preventing noise and damping from degrading the measurement signal.
Solution Approach 2:
The patent replaces direct analog signal transmission with a digital communication system. By converting analog measurement signals to digital signals at the isolated interface, the system substitutes the vulnerable analog transmission path with a robust digital communication channel that is resistant to noise and damping over long distances.
2Reliability
If a barrier is provided to electrically separate the sensor unit from the control unit to protect against harsh electrical conditions, then the control unit is protected from voltage variations, but the interface becomes more complex and requires significant engineering effort
Solution Approach 1:
An isolated interface unit serves as a mediator that provides electrical separation between the sensor unit and control unit. This single integrated component handles signal conversion, electrical isolation, and communication protocol management, protecting the control unit from harsh electrical conditions while maintaining a relatively simple overall system architecture.
Solution Approach 2:
The isolated interface unit performs multiple functions within a single component: analog-to-digital conversion, electrical isolation, signal conditioning, and communication protocol handling. This multi-functionality reduces the need for separate components and minimizes the overall complexity of the interface despite the requirements for electrical separation.
3Reliability
If digital signals are used instead of analog signals for transmission, then the signal is more robust against damping and noise, but an analog-to-digital converter is required which adds to the sensor unit complexity
Solution Approach 1:
The isolated interface acts as an intermediary that contains the analog-to-digital converter. This placement of the ADC in the interface unit rather than in the sensor unit itself allows the sensor unit to remain relatively simple while still achieving robust digital signal transmission that is resistant to damping and noise.
Data Source
AI summary
Methods for use in a measurement system. Some embodiments comprise at least one sensor unit and a control unit, wherein the at least one sensor unit is configured to detect a physical quantity and to form a sensor data signal. The method comprises, at the control unit, receiving a data receive signal from the sensor unit, and interpreting the data receive signal to be one of at least the sensor data signal and another data signal, wherein the interpreting is based on an attribute information intrinsic to the data receive signal. Furthermore, there is a sensor unit for use in measurement data acquisition, an apparatus configured to control a measurement data acquisition, a measurement system for use in measurement data acquisition, and a medium incorporating a sequence of operation steps that, when executed, perform a method for use in a measurement system for data acquisition.