Self-Calibrating Resistive Flexure Sensor Using Reference Element
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Solution Overview
Problem
Conventional flexure sensors face inconsistencies due to manufacturing variations and temperature effects, making calibration challenging due to mismatched resistance properties between the resistive elements and biasing networks.
Innovation Solution
A self-calibrating flexure sensor system is developed, featuring a substrate with both flexible and non-flexible portions, where a first resistive element on the flexible portion and a second resistive element on the non-flexible portion provide a reference resistance, ensuring uniformity and temperature coefficient matching, thus canceling out part-to-part variations and temperature-dependent shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional printing or metal deposition techniques are used to manufacture resistive elements, then manufacturing simplicity is maintained, but manufacturing precision deteriorates due to inconsistent properties from stencil accuracy, material thickness, and composition variations
Solution Approach 1:
The sensor performs self-calibration by using its own resistive element characteristics to automatically adjust and compensate for manufacturing variations, eliminating the need for external calibration equipment or manual adjustment procedures
Solution Approach 2:
The system dynamically adjusts biasing parameters and scaling factors based on actual resistive element measurements to compensate for manufacturing tolerances, transforming fixed manufacturing limitations into adjustable operational parameters
2Device complexity
If fixed-value resistors are used in the biasing network, then device complexity is reduced, but measurement precision deteriorates due to temperature coefficient mismatches between the resistive element and biasing network
Solution Approach 1:
The biasing network uses resistors with temperature coefficients matched to the resistive flexure sensing element, ensuring uniform thermal response characteristics across all resistive components and eliminating temperature-dependent measurement errors
Solution Approach 2:
The system incorporates temperature compensation mechanisms that monitor thermal conditions and adjust biasing parameters accordingly, creating a feedback loop that maintains measurement accuracy across varying temperature conditions
3Manufacturing precision
If each sensor requires individual calibration to compensate for manufacturing variations, then manufacturing precision is maintained, but productivity deteriorates due to the time-consuming calibration process for each device
Solution Approach 1:
The sensor automatically performs calibration functions using built-in reference elements and algorithms, eliminating the need for external calibration equipment and manual procedures for each device
Solution Approach 2:
The sensor incorporates self-calibration capabilities that can be executed during initial power-up or periodic intervals, performing calibration actions automatically without requiring production line stops or additional calibration steps
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 achieves consistent and stable measurements by using the second resistive element as a reference for biasing, eliminating the need for additional circuitry and ensuring uniform exposure to environmental conditions, thereby enhancing the accuracy and reliability of the flexure sensor.
Implementation Method 1
A first resistive element can be disposed on or within the flexible portion. The first resistive element can have a variable resistance dependent on a change in flexure of the flexible portion.
Implementation Method 2
The second resistive element disposed within the non-flexible portion of the substrate can provide a reference resistance for biasing the flexure sensor. Any inconsistencies in the manufacturing of the resistive elements will be uniform across the resistive elements because the resistive elements can be formed on the substrate at the same time. Any deterioration of tolerance and/or stability of the resistive elements over time would also be uniform because all of the resistive elements are exposed to the same environmental conditions throughout the lifetime of the sensor.
Data Source
AI summary
A variable resistance flexure sensor, and a system and method of controlling an appliance using a variable resistance flexure sensor are provided. The sensor can include a substrate having a flexible portion and a non-flexible portion. A plurality of electrically resistive elements, such as a first resistive element and a second resistive element, can be disposed on the substrate where at least one resistive element is exclusively within the non-flexible portion of the substrate and at least one resistive element is within the flexible portion of the substrate. The resistive element within the non-flexible portion of the substrate can act as a reference resistance for the flexure sensor and can be used as, or as part of, a biasing network for the electrically resistive element within the flexible portion of the substrate. The flexure sensor can be used within an appliance to detect various conditions such as temperature, moisture, etc.