Pressure Detecting Device External Force Error Correction
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Solution Overview
Problem
Existing pressure detecting devices suffer from low detection accuracy due to inclusion of external force components in measurement values, leading to unreliable results.
Innovation Solution
A pressure detecting device with multiple strain resistant bridges is employed, where the central strain resistant bridge's output is corrected using the outputs from outer peripheral bridges to eliminate errors caused by external forces, enhancing detection accuracy and allowing for early detection of temporal degradation or faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a detection portion is placed at the position where the amount of strain is maximum, then the detection sensitivity is improved, but the measurement value includes components of external force other than pressure, resulting in low detection accuracy
Solution Approach 1:
The strain detecting element is divided into multiple detection portions with different strain sensitivity characteristics. A first detection portion is positioned at the maximum strain location for high sensitivity, while a second detection portion is positioned at a location with less strain for external force detection. This segmentation allows the system to simultaneously achieve high detection sensitivity while compensating for external force interference through combined signal processing.
2Measurement precision
If multiple strain resistant bridges are provided at different positions, then the ability to correct external force errors is improved, but the device complexity increases
Solution Approach 1:
The multiple strain resistant bridges serve dual functions: the first detection portion provides primary pressure detection with high sensitivity, while the second detection portion simultaneously serves as an external force sensor and a reference for error correction. This multi-functionality reduces the need for additional dedicated correction mechanisms, thereby limiting the increase in device complexity while achieving improved error correction capability.
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 solution significantly improves detection accuracy by correcting for external force errors and enables early detection of instrument degradation, resulting in a highly reliable pressure measurement.
Implementation Method 1
a strain detecting element which detects strain caused in the strain inducer
Data Source
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AI summary
In order to provide a highly accurate pressure detecting device which is not affected by a component of an external force, a pressure detecting device which is mounted in a measurement target instrument includes: a strain inducer 15 to which pressure of a pressure medium is applied and which generates strain in accordance with the pressure; and a strain detecting element 16 that is bonded onto a surface opposite to a pressure receiving surface of the strain inducer 15, in which the strain detecting element 16 includes one or multiple central strain resistant bridges 300a which are arranged at a central portion of the strain detecting element 16 in a bonded surface direction, and one or multiple outer peripheral strain resistant bridges 300b - 300n which are arranged at an outer periphery, and in which, for example, deformation of the strain detecting element 16 caused by an external force when being screw-fixed to the measurement target instrument is obtained through the multiple strain resistant bridges, an error of detection pressure caused by the obtained deformation in a pressure value detected through the central strain resistant bridge 300a is corrected, and the corrected pressure value is referred to as a detection value of the pressure detecting device.