Ceramic Pressure Sensor Temperature Gradient Compensation
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Solution Overview
Problem
Ceramic pressure sensors face measurement errors due to temperature gradients caused by temperature differences between the medium and ambient temperatures, which existing solutions struggle to compensate for without restricting sensor construction or material choices.
Innovation Solution
A ceramic pressure sensor design featuring a temperature transducer with series-connected thermoelements and an electrically-conductive layer on the thrust ring, allowing for external temperature gradient measurement and compensation, thereby avoiding integration-related restrictions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature transducer with integrated thermoelements is used to compensate for temperature gradient measurement errors, then measurement precision is improved, but device complexity and material restrictions increase
Solution Approach 1:
The temperature transducer is extracted from the pressure sensor and positioned externally in the housing. The transducer measures the temperature gradient in the housing rather than within the pressure sensor itself, eliminating integration constraints and material restrictions while maintaining measurement accuracy for compensation purposes.
2Measurement precision
If thermoelements are integrated into the pressure sensor for temperature gradient measurement, then measurement precision is improved, but ease of manufacture deteriorates
Solution Approach 1:
The temperature transducer is positioned externally in the housing rather than being integrated into the pressure sensor. This extraction allows independent manufacturing of the pressure sensor and temperature transducer components, simplifying the manufacturing process and expanding material selection flexibility.
3Ease of manufacture
If the temperature transducer is positioned outside the pressure sensor, then ease of manufacture and design freedom are improved, but measurement precision may deteriorate
Solution Approach 1:
The housing serves as an intermediary structure that contains both the pressure sensor and the externally positioned temperature transducer. The transducer measures the temperature gradient in the housing, which indirectly reflects the temperature conditions affecting the pressure sensor, maintaining measurement accuracy for compensation while preserving manufacturing flexibility.
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 design effectively compensates for measurement errors caused by temperature gradients, improving accuracy without constraining sensor construction or material selection, and is suitable for applications with slow or rapid temperature changes.
Implementation Method 1
a temperature transducer for providing a thermovoltage dependent upon a temperature gradient along the pressure measuring sensor, comprising two, series-connected thermoelements
Data Source
AI summary
A pressure measuring sensor having a ceramic pressure sensor includes a temperature transducer to provide a thermovoltage dependent on a temperature gradient. The temperature transducer includes two series-connected thermoelements, each of which has a galvanic contact between a wire of the thermoelement and a connecting conductor connecting the galvanic contacts of the two thermoelements to one another. The temperature transducer enables the compensation for a measuring error caused by a temperature gradient occurring along the pressure measuring sensor.