Sensing System Electrical Isolation for Calibration Accuracy
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Solution Overview
Problem
Sensors, especially sensitive amperometric gas sensors, face interference and accuracy limitations due to electrical interference during calibration, which affects their sensitivity and accuracy.
Innovation Solution
A sensing system with a sensor unit and driver where the sensing circuit and memory circuit are electrically isolated, allowing calibration data to be stored and used independently, preventing electrical interference and enabling sensitive operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If calibration circuits are incorporated within the sensor unit to perform calibration during use, then calibration can be carried out during operation, but electrical interference from the calibration circuits affects the sensitivity and accuracy of very sensitive sensors
Solution Approach 1:
The sensor system is divided into two electrically isolated parts: the sensor unit containing only the sensing circuit, and the sensor driver containing the calibration circuit. This segmentation allows calibration to occur in the driver without electrical interference affecting the sensitive sensing circuit in the sensor unit.
Solution Approach 2:
The calibration circuit is extracted from the sensor unit and placed in the sensor driver. This extraction removes the source of electrical interference from proximity to the sensitive sensing circuit, allowing calibration to proceed without degrading sensor sensitivity or accuracy.
2Device complexity
If calibration data are stored in the sensor driver, then the sensing circuit remains simple and sensitive, but the sensor unit requires demountable connection to transfer calibration data
Solution Approach 1:
The sensor unit and sensor driver are combined into a functional system where the sensor unit provides sensing and the driver provides calibration and data storage. The demountable connection allows these two parts to work together while maintaining the simplicity of the sensing circuit in the sensor unit.
3Loss of information
If calibration data are stored in the sensor unit, then calibration information is readily available, but electrical interference in the sensor unit affects sensing accuracy
Solution Approach 1:
The calibration data storage function is extracted from the sensor unit and placed in the sensor driver. This extraction ensures that calibration information is readily available in the driver while the sensor unit remains electrically quiet and free from interference that would degrade sensing accuracy.
Data Source
AI summary
A sensing system comprising a sensing unit and a sensor drive, wherein the sensing unit comprises a sensing circuit and a memory circuit, the sensing circuit and the memory circuit being electrically isolated from each other within the sensing unit.