Pressure Sensor Temperature Gradient Compensation
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Solution Overview
Problem
Existing pressure measurement sensors face challenges in accurately compensating for temperature gradient influences due to their cross-sensitivity, particularly when assuming equilibrium states that do not account for time-varying temperature gradients, which can lead to inaccuracies in pressure readings.
Innovation Solution
A method that involves registering temperature signals, determining their time derivative, and applying correction functions based on the sign and magnitude of the time derivative to adjust pressure measurements, with specific coefficients and functions for positive and negative temperature changes, and using a temperature sensor in thermal contact with the pressure measuring cell to account for dynamic temperature effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If equilibrium-based temperature correction methods are used, then the correction process is simple, but the accuracy deteriorates under time-varying temperature gradients
Solution Approach 1:
The patent transitions from static equilibrium-based correction to dynamic correction by introducing time derivatives of temperature (dT/dt, d²T/dt²) into the correction model. This allows the system to adapt to time-varying temperature gradients while maintaining reasonable complexity through structured correction functions.
Solution Approach 2:
The correction approach changes from using only temperature values (equilibrium parameters) to incorporating temperature derivatives (dynamic parameters). This parameter expansion enables accurate compensation for transient temperature effects without excessive complexity.
2Device complexity
If the system is modeled as a Markov system using only current parameters, then the correction model is simple, but the accuracy deteriorates when material history affects the system
Solution Approach 1:
The patent incorporates historical temperature information through time derivatives and integration, effectively preparing the correction model to account for past thermal states. This allows the system to anticipate and compensate for thermal effects based on previous conditions, improving accuracy without excessive complexity.
Solution Approach 2:
The correction model uses feedback from temperature derivatives and integrated temperature history to continuously adjust pressure measurements. This feedback mechanism captures material history effects while maintaining a structured correction 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 effectively compensates for temperature gradient influences, ensuring rapid convergence of pressure measurements to accurate values by differentiating correction functions based on the sign and magnitude of temperature changes, thereby improving the accuracy and reliability of pressure measurements.
Implementation Method 1
a temperature sensor, which registers a temperature relevant for the behavior of the pressure measuring cell
Data Source
AI summary
A method for the compensating temperature gradient influences on a pressure measuring transducer, comprising the steps of: registering a pressure signal Sp(t); registering a temperature signal T(t); ascertaining a pressure measured value ps(Sp(t), T(t)); determining the time derivative of the temperature signal dT/dt; correcting the pressure measured value with a correction function, which depends on the time derivative, wherein, as a function of the sign of the time derivative, another correction function is selected, or other coefficients in a function of equal type are selected.