Pressure Sensor Temperature Compensation via Differential Signal
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Solution Overview
Problem
Existing pressure sensors require pre-storing compensation factors for temperature variations, increasing manufacturing steps and costs due to the need for unique output characteristic corrections for each element.
Innovation Solution
A pressure sensor design utilizing two pressure receiving elements with the same output characteristics, where one is connected to a diaphragm and the other is disconnected, outputs a signal based on the difference between their voltage changes, eliminating the need for temperature compensation factors by ensuring equal temperature influence on both elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature compensation operation using pre-stored compensation factors is performed, then temperature influence on output signal is eliminated, but manufacturing steps and costs increase
Solution Approach 1:
The pressure sensor is segmented into two separate pressure receiving elements: one that receives both pressure and temperature influences, and another that receives only temperature influences. This segmentation allows the temperature component to be isolated and subtracted from the total signal, eliminating the need for pre-stored compensation factors and reducing manufacturing complexity.
Solution Approach 2:
The second pressure receiving element acts as an intermediary that measures only the temperature influence on the output signal. By using this intermediary element, the temperature component can be identified and removed from the first element's signal, achieving accurate temperature compensation without requiring complex pre-stored compensation data for each element.
2Measurement precision
If compensation factors determined according to each element's output characteristic are pre-stored, then accurate temperature correction is achieved, but manufacturing costs increase
Solution Approach 1:
By segmenting the measurement function into two identical pressure receiving elements with the same output characteristics, the patent eliminates the need for individualized compensation factors. Each element has identical characteristics, so no element-specific calibration data needs to be stored, simplifying the manufacturing process while maintaining accurate temperature correction.
Solution Approach 2:
The patent uses two pressure receiving elements that are designed to have the same output characteristics and homogeneity. This homogeneity ensures that both elements respond identically to temperature changes, allowing the second element's output to serve as a direct template for compensating the first element's signal without requiring element-specific compensation factors.
3Measurement precision
If one pressure receiving element is connected to diaphragm and another is disconnected, then pressure detection is enabled, but structural asymmetry increases
Solution Approach 1:
The patent intentionally introduces asymmetry in the connection configuration: one pressure receiving element is connected to the diaphragm while the other is disconnected. This controlled asymmetry is necessary to create the functional difference needed for pressure detection - the connected element experiences both pressure and temperature, while the disconnected element experiences only temperature, enabling the differential measurement approach.
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 approach allows for accurate pressure detection without requiring compensation factors, reducing manufacturing complexity and costs while maintaining precise temperature compensation, ensuring the signal is influenced only by pressure.
Implementation Method 1
Each of the pressure receiving elements has a pressure receiving surface and outputs an output signal that changes according to a temperature and a pressure applied to the pressure receiving surface
Implementation Method 2
The pressure receiving surface of one of the pressure receiving elements is connected to the diaphragm through the coupling portion
Data Source
AI summary
A pressure sensor includes a diaphragm, a coupling portion coupled to the diaphragm, and two pressure receiving elements. Each pressure receiving element outputs an output signal that changes according to the temperature and the pressure applied to a pressure receiving surface and has an output characteristic that represents the relationship of the output signal to the pressure and the temperature. The two pressure receiving elements have the same output characteristics. The pressure receiving surface of one of the two pressure receiving elements is connected to the diaphragm through the coupling portion, and the pressure receiving surface of the other pressure receiving element is disconnected from the diaphragm. The pressure sensor outputs a signal that is in accordance with the difference between voltages of the two pressure receiving elements.