Sensor Element Array Correction for Voltage Drop and Resistance Variation
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Solution Overview
Problem
Existing sensor apparatuses with element array circuits face challenges in achieving high measurement accuracy for physical quantities due to voltage drops and resistance variations in impedance elements.
Innovation Solution
The sensor apparatus incorporates a control circuit that corrects output voltages based on multiple impedance elements, using a power feeding line selector and operational amplifiers to manage voltage potentials, thereby enhancing measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple impedance elements are arranged in an element array circuit, then the sensor can measure physical quantities across multiple positions, but voltage drops and resistance variations occur that reduce measurement accuracy
Solution Approach 1:
The control circuit measures the actual voltage at each node in the element array circuit and uses this feedback information to correct the output voltages. By continuously monitoring and adjusting for voltage drops and resistance variations, the system maintains measurement accuracy despite the presence of multiple impedance elements causing voltage instability.
Solution Approach 2:
The control circuit dynamically adjusts correction values based on measured voltage parameters. By changing the correction parameters according to actual voltage conditions at different nodes, the system compensates for voltage drops and resistance variations, thereby improving measurement precision without requiring perfect voltage stability.
2Measurement precision
If correction circuits are added to each node to compensate for voltage drops, then measurement accuracy improves, but device complexity increases
Solution Approach 1:
Instead of implementing separate correction circuits at each node, the patent merges the correction functionality into a single centralized control circuit. This control circuit measures voltages across all nodes and performs corrections through signal processing, thereby reducing overall device complexity while maintaining measurement precision.
Solution Approach 2:
The control circuit acts as an intermediary between the element array and the output. It introduces correction signals that compensate for voltage drops without requiring direct modification of each node's circuitry. This intermediary approach simplifies the overall system while achieving accurate output voltage correction.
Data Source
AI summary
A sensor apparatus includes an element array circuit and a control circuit. The element array circuit includes first wirings, second wirings, and impedance elements. The second wirings each extend in a direction different from a direction in which the first wirings each extend. The impedance elements are each coupled to both one of the first wirings and one of the second wirings. The control circuit is configured to, based on at least two of output voltages each resulting from corresponding one of correction impedance elements, among the impedance elements, that are coupled to one first correction wiring selected from the first wirings, correct an output voltage resulting from at least one of measurement impedance elements, among the impedance elements, that are coupled to one first measurement wiring that is selected from the first wirings and other than the first correction wiring.