Pressure Sensor Compensation Using Multi-Axial Temperature Sensing
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Solution Overview
Problem
Existing pressure sensors face inaccuracies in temperature compensation, particularly during rapid temperature changes, due to intrinsic stresses and parasitic pressure signals caused by thermal expansion in components with different coefficients of expansion, leading to measurement errors.
Innovation Solution
A pressure sensor with multiple temperature sensors positioned at different axial locations and distances from the process fluid, connected to a compensation unit that accounts for various temperatures and input information such as installation position, medium, and container properties, using pre-calibrated compensation values to accurately correct for thermal and parasitic effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single temperature sensor is used for compensation, then the device complexity is low, but the measurement precision deteriorates during rapid temperature changes
Solution Approach 1:
The temperature compensation system is segmented into multiple temperature sensors positioned at different locations (first temperature sensor near the process connection, second temperature sensor in the housing) to measure different thermal zones. This segmentation allows the system to capture temperature gradients and perform more accurate compensation during rapid temperature changes, resolving the contradiction between measurement precision and device complexity.
Solution Approach 2:
The patent adds a spatial dimension to temperature measurement by positioning temperature sensors at different axial locations along the pressure sensor assembly. This dimensional approach enables the system to detect temperature gradients along the axial direction, improving compensation accuracy without simply increasing the number of sensors at a single location.
2Measurement precision
If multiple temperature sensors are used, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-calculating and storing compensation values in a lookup table during the manufacturing process. The compensation unit queries this pre-prepared table based on measured temperatures, avoiding the need for complex real-time calculations. This approach improves temperature compensation accuracy while keeping the operational system structure relatively simple.
Solution Approach 2:
The patent introduces a compensation unit as an intermediary component that mediates between the multiple temperature sensors and the pressure measurement system. This intermediary processes temperature data, retrieves appropriate compensation values from the lookup table, and applies corrections to the pressure signal, thereby managing the complexity of multiple sensors through a dedicated intermediate processing layer.
3Reliability
If temperature compensation is performed using conventional methods, then the device complexity remains low, but the measurement precision deteriorates under thermal stress
Solution Approach 1:
The patent applies local quality by positioning temperature sensors at specific locations with different thermal characteristics - the first temperature sensor is positioned near the process connection where temperature changes are most rapid, while the second temperature sensor is positioned in the housing where temperature is more stable. This localized measurement approach improves reliability under thermal stress by capturing the most relevant temperature information without requiring a complex distributed sensor network.
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 provides precise and rapid temperature compensation, minimizing measurement errors by considering multiple temperature sources and environmental factors, resulting in more accurate pressure readings.
Implementation Method 1
the pressure sensor has at least one first temperature sensor for measuring a first temperature and a second temperature sensor for measuring a second temperature
Implementation Method 2
Particularly in the case of pressure measuring cells which are exposed at their mounting location to large temperature fluctuations that, in part, occur within a short period of time, this may result in intrinsic stresses or internal deformations, particularly of the diaphragm. These temperature-induced intrinsic stresses may subsequently cause parasitic pressure signals
Data Source
AI summary
The invention relates to a pressure sensor and related method for the compensation of a pressure, wherein the pressure sensor has a pressure measuring cell, with a housing and an electronic sensor system and an electronic evaluation system disposed within the housing, as well as at least one first temperature sensor for measuring a first temperature and a second temperature sensor for measuring a second temperature, wherein the pressure sensor has a compensation unit connected to the at least two temperature sensors, and wherein the compensation unit determines a compensation for the pressure taking into account at least the first temperature and the second temperature.