Pressure Sensor Temperature Compensation via Segmented Strain Zones
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Solution Overview
Problem
Existing pressure sensing technologies suffer from signal distortion due to temperature drift, which complicates accurate pressure detection as temperature changes interfere with the pressure signal.
Innovation Solution
A pressure sensing device with a rigid structure and force sensors, where strain amplification zones are formed between rigid blocks, and second sensors provide temperature compensation signals to isolate the pressure signal from temperature signals, using a bridge circuit connected to a signal processing circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional pressure sensors are used, then pressure detection is achieved, but temperature drift causes signal distortion
Solution Approach 1:
The sensor output signal is segmented into two independent components: pressure signal and temperature signal. This is achieved by placing first sensors in strain amplification zones to detect pressure-induced strain and second sensors on rigid blocks to detect temperature-induced strain, allowing separate measurement and subsequent subtraction of temperature effects from the total signal.
Solution Approach 2:
Second sensors act as intermediary elements that specifically measure temperature drift effects. These sensors are positioned on rigid blocks where they detect only temperature-induced strain changes, serving as a reference that mediates the separation between temperature and pressure signals in the overall measurement system.
2Measurement precision
If temperature compensation is implemented, then signal accuracy improves, but device complexity increases
Solution Approach 1:
Temperature compensation functionality is merged into the existing pressure sensing structure by strategically positioning second sensors on rigid blocks within the same device framework. The compensation mechanism shares the same structural platform and signal processing pathway as the primary pressure sensing, avoiding the need for separate compensation hardware systems.
Solution Approach 2:
The rigid block structure serves multiple functions: it provides mechanical support for the sensor assembly, creates strain amplification zones for pressure detection, and simultaneously serves as a mounting platform for second sensors that enable temperature compensation. This multi-functionality reduces overall device complexity by eliminating dedicated temperature compensation structures.
3Measurement precision
If strain amplification zones are created, then pressure signal detection sensitivity increases, but structural complexity increases
Solution Approach 1:
Instead of attempting to measure minute strain changes directly in a uniform structure, the design inverts the approach by creating rigid blocks that remain relatively strain-free and positioning sensors on these stable reference points. The strain amplification effect is achieved through the structural geometry itself rather than through complex sensor positioning or additional amplification mechanisms.
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 solution effectively eliminates signal distortion from temperature changes, providing a clean pressure signal in various temperature environments, with advantages of easy installation, simple circuit design, low cost, and minimal temperature drift.
Implementation Method 1
first sensors arranged in the strain amplification zones and capable of following the deformation of the measured object
Implementation Method 2
second sensors arranged on the rigid blocks and located close to corresponding first sensors. An output signal of each of the second sensors serves as a temperature compensation amount of the corresponding first sensor
Data Source
AI summary
A pressure sensing device is provided. In the pressure sensing device, the rigid structure includes rigid blocks arranged at intervals, and strain amplification zones are formed between every two adjacent rigid blocks. The force sensors include first sensors and second sensors. The first sensors are arranged on the two installation surfaces of the strain amplification zones and capable of following the deformation of the measured object, the second sensors are arranged on the two installation surfaces of the rigid blocks and located close to corresponding first sensors. At least four force sensors are connected to form a bridge circuit, and the bridge circuit is electrically connected to a signal processing circuit, so as to detect deformation of the rigid structure and obtain a force acted on the measured object. An output signal of each of the second sensors serves as a temperature compensation signal of the corresponding first sensors.