Strain Gauge Operational Amplifier Circuit for Multi-Axis Deformation
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Solution Overview
Problem
Conventional strain gauge Wheatstone bridge circuits are limited in their ability to measure mechanical changes, particularly in terms of flexibility and accuracy, especially when dealing with complex mechanical deformations such as bending and torsion across multiple axes.
Innovation Solution
A device comprising at least one resistor and an operational amplifier, where the resistor converts mechanical changes into resistance value changes, serving as input resistance for the operational amplifier, allowing for various circuit configurations to measure multiple types of mechanical changes, including bending and torsion across multiple axes, by using strain gauges, inductive, or capacitive resistors, and employing multiple resistors with adjustable input voltages to enhance measurement precision and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional Wheatstone bridge circuits are used for measuring mechanical changes, then the measurement can be performed with standard circuit configurations, but the flexibility and accuracy for measuring complex mechanical deformations (bending and torsion across multiple axes) are limited
Solution Approach 1:
The patent divides the measurement function into separate operational amplifiers, each dedicated to measuring a specific mechanical parameter (bending moment, torque, etc.). This segmentation allows each amplifier to be optimized for its specific measurement task, improving versatility while maintaining manageable circuit complexity through functional decomposition
Solution Approach 2:
The patent creates a universal measurement platform where multiple operational amplifiers with different input resistance configurations can measure various mechanical parameters (bending, torsion, multiple axes) using the same basic circuit architecture. This multi-functionality approach enables a single device to handle diverse measurement tasks without requiring completely different circuit designs for each parameter
2Measurement precision
If multiple strain gauges are connected in Wheatstone bridge circuits to measure multiple mechanical parameters, then comprehensive measurement coverage is achieved, but measurement precision and accuracy are reduced due to interference from temperature and common mode voltages
Solution Approach 1:
The patent introduces operational amplifiers as intermediary devices between the strain gauges and the measurement system. These amplifiers with their high input impedance serve as buffers that isolate the strain gauge bridge circuits from each other, preventing common mode voltage interference and temperature drift from affecting multiple measurements simultaneously, thereby improving measurement accuracy
Solution Approach 2:
The patent extracts the measurement function for each mechanical parameter into separate operational amplifier circuits, allowing each to be independently optimized and calibrated. This separation removes the相互 interference that occurs in traditional Wheatstone bridge configurations where multiple measurements share common circuit elements, thus improving precision by eliminating cross-talk and common mode errors
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
This configuration enables precise measurement of various mechanical changes, including bending and torsion across multiple axes, with improved accuracy and flexibility, allowing for simultaneous measurement of multiple types of deformations and reduced interference from temperature and common mode voltages.
Implementation Method 1
at least one resistor, which is designed to convert a mechanical change into a change of its resistance value
Data Source
AI summary
A device for measuring mechanical changes includes at least one first resistor which is designed to convert a mechanical change into a change of its resistance value and at least one operational amplifier, wherein the at least first resistor and the operational amplifier are connected such that the at least first resistor serves as input resistance for the operational amplifier and the operational amplifier provides or can provide a measurement result at an output. The first resistor is for example a strain gauge that can be secured to a component.