Temperature Sensor Thermal Paste Encapsulation
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Solution Overview
Problem
Conventional temperature sensors face limitations in achieving high precision due to mechanical stresses caused by thermal expansion and adhesive coupling, which result in measurement errors when resolving temperatures in the millikelvin range.
Innovation Solution
The sensor element is completely enclosed with a thermally conductive paste within the housing, decoupling it mechanically while maintaining thermal contact, and ensuring hermetic sealing to prevent outgassing, especially in ultra-clean environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the sensor element is directly contacted with the housing wall to improve thermal exchange, then thermal contact is improved, but mechanical stress increases due to thermal expansion differences
Solution Approach 1:
A thermally conductive paste is introduced as an intermediary substance between the sensor element and the housing wall. This paste maintains good thermal contact while being compliant enough to avoid transmitting mechanical stresses from thermal expansion to the sensor element, thus resolving the contradiction between thermal contact and mechanical stress.
Solution Approach 2:
The physical state and properties of the coupling medium are changed from rigid (direct contact) to viscous/compliant (thermally conductive paste). This parameter change allows the system to maintain thermal conductivity while eliminating mechanical stress transmission, enabling high-precision temperature measurement without stress-induced errors.
2Strength
If adhesive cementing or clamping is used to fix the sensor, then mechanical stability is improved, but measurement accuracy deteriorates due to induced mechanical stress
Solution Approach 1:
The thermally conductive paste serves as a stress-free intermediary that replaces adhesive cementing and clamping methods. It provides sufficient mechanical support to hold the sensor element in place while being compliant enough not to induce stress, thereby maintaining both mechanical stability and measurement accuracy.
Solution Approach 2:
Rigid mechanical fixing methods (adhesive cementing, clamping) are replaced with a compliant thermal paste that provides mechanical support without stress induction. This substitution eliminates the trade-off between mechanical stability and measurement precision by using a material that provides support through viscosity rather than rigid bonding.
3Temperature
If the housing wall is made thin to reduce thermal insulation, then thermal exchange is improved, but mechanical strength and hermetic sealing deteriorate
Solution Approach 1:
The thermally conductive paste acts as an intermediary that enables effective thermal exchange without requiring thin housing walls. It fills the gap between the sensor element and the housing wall, providing a high thermal conductivity path while allowing the housing wall to maintain its structural thickness for hermetic sealing and mechanical strength.
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 high-resolution temperature measurements in the millikelvin range with reduced mechanical stress, ensuring accurate and reliable readings without contamination, and is suitable for use in ultra-high vacuum conditions.
Implementation Method 1
the sensor element is totally enclosed with a thermally conductive material, in particular with a thermally conductive paste
Implementation Method 2
ensuring hermetic sealing to prevent outgassing, especially in ultra-clean environments
Data Source
AI summary
A temperature sensor comprising a sensor element that is arranged in a housing, is characterized in that the sensor element is totally enclosed with a thermally conductive material, preferably with a thermally conductive paste, inside the housing.