Two-Fixed-End Beam Pressure Sensor for Small-Displacement Sensing
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Solution Overview
Problem
The detection sensitivity of beam pressure sensors is decreased due to the small strain generated on the bending beam when the displacement of the detected force is small, as they typically have a cantilever structure with one fixed end.
Innovation Solution
A beam pressure sensor design with two fixed ends, featuring opposite stressed and strain surfaces, and strain gauges electrically connected to a circuit, allowing for larger strain differences with small displacements, thereby enhancing detection sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a cantilever structure with one fixed end is used, then the structure is simple, but the strain generated on the bending beam is relatively small when displacement is small, causing detection sensitivity to decrease
Solution Approach 1:
The patent inverts the conventional cantilever structure by fixing both ends of the bending beam instead of leaving one end free. This inversion fundamentally changes the mechanical behavior of the beam, transforming it from a structure with small strain under small displacement to one that generates large strain differences under the same conditions, thereby resolving the contradiction between measurement precision and structural simplicity.
Solution Approach 2:
The patent changes the boundary condition parameter of the bending beam from one-fixed-end to two-fixed-ends. This parameter change in the structural configuration fundamentally alters the strain distribution characteristics, enabling the beam to generate larger strain differences when subjected to small displacements, thus improving detection sensitivity without requiring complex additional components.
2Measurement precision
If the displacement of the detected force is small, then the sensor can operate in a compact range, but the strain generated on the bending beam is relatively small, causing detection sensitivity to decrease
Solution Approach 1:
By inverting the conventional cantilever configuration to a two-fixed-ends structure, the patent reverses the strain generation mechanism. Instead of relying on large displacements to generate measurable strain, the inverted structure amplifies the strain response to small displacements, allowing the sensor to operate in a compact range while maintaining high detection sensitivity.
Solution Approach 2:
The patent changes the mechanical parameter of the bending beam by modifying its boundary conditions from one-fixed-end to two-fixed-ends. This parameter change transforms the strain-displacement relationship, enabling the system to generate large strain differences even when the detected force produces only small displacements, thus resolving the contradiction between compact operation range and strain magnitude.
3Measurement precision
If strain gauges are placed on both stressed and strain surfaces, then detection sensitivity is improved, but device complexity increases
Solution Approach 1:
The patent merges the measurement functions by placing strain gauges on both the stressed surface and the strain surface of the bending beam. This combining of measurement points allows for differential measurement that captures the full strain difference across the beam thickness, significantly improving detection sensitivity. The dual-surface configuration works synergistically to enhance measurement precision while maintaining a relatively simple overall sensor structure.
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 design enables improved detection sensitivity by generating a large strain difference on the bending beam with minimal displacement, improving the sensor's ability to detect forces accurately.
Implementation Method 1
one or more strain gauges, being electrically connected to a circuit configured for detecting strain; at least one of the stressed surface and the strain surface is provided with at least one of the strain gauges
Data Source
AI summary
A beam pressure sensor, a pressure sensing device, an electronic apparatus are disclosed. The beam pressure sensor includes: a bending beam, provided with two ends that are fixed, outside wall surfaces of the bending beam are provided with a stressed surface and a strain surface arranged to be opposite to each other; and one or more strain gauges, each strain gauge being electrically connected to a circuit configured for detecting strain; and at least one of the stressed surface and the strain surface is provided with at least one of the strain gauges. The detection sensitivity of the beam pressure sensor is improved, a small displacement is only needed for the detected force.