Probe Heating Jacket With Mechanical Isolation for Drift Control
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Solution Overview
Problem
Existing mechanical testing instruments face challenges in maintaining temperature control without affecting their mechanical or electromechanical properties, experiencing thermomechanical drift, and suffering from heat transfer issues that impact test accuracy and reliability.
Innovation Solution
A mechanically isolated heating element surrounds the probe to localize heat transfer, minimizing heat escape and reducing stress on the instrument, while maintaining precise temperature control through non-contact heating methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heating element is directly coupled to the mechanical testing instrument, then temperature control is achieved, but the mechanical or electromechanical properties of the instrument are affected and thermomechanical drift occurs
Solution Approach 1:
A heating jacket is introduced as an intermediary component that surrounds the probe but does not directly contact it. The heating jacket transfers heat to the probe through thermal conduction across a small gap, achieving temperature control without the heating element being mechanically coupled to the probe, thus avoiding degradation of the probe's mechanical properties
Solution Approach 2:
The heating system is segmented into separate components: the heating element is isolated from the probe, with the heating jacket serving as a distinct thermal coupling medium. This segmentation allows independent optimization of the heating function and the mechanical testing function without interference between them
2Reliability
If the heating element is mechanically isolated from the probe, then thermomechanical drift is reduced, but heat transfer efficiency may be compromised
Solution Approach 1:
The heating jacket is designed as a thin-walled structure that closely conforms to the probe geometry. This thin film approach maintains close thermal coupling between the heating element and the probe while preserving mechanical isolation, achieving both thermomechanical stability and efficient heat transfer
Solution Approach 2:
The heating element is positioned in a surrounding configuration (radial dimension) rather than direct axial contact, allowing heat transfer through multiple directions simultaneously. This dimensional arrangement increases the effective heat transfer surface area while maintaining mechanical isolation
3Loss of energy
If heat transfer is localized proximate to the mechanical testing instrument, then heat escape is minimized, but the complexity of the heating system increases
Solution Approach 1:
The heating jacket is designed to conformally surround the probe, creating a nested configuration where the heating element is positioned within a protective housing that closely envelops the probe. This nesting arrangement localizes heat transfer to the immediate vicinity of the probe while using a modular, integrated structure to manage system complexity
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 enhances test precision and accuracy by isolating the heating element from the probe, reducing thermomechanical drift, and minimizing stress on the instrument, thereby improving the reliability and performance of mechanical testing systems.
Implementation Method 1
heat transfer from multiple directions relative to the instrument while at the same time enclosing the instrument and minimizing escape of the transferred heat
Implementation Method 2
the mechanical testing instrument is heated, for instance the mechanical instrument is heated to substantially equal a temperature of the sample of material. By heating the probe to a temperature equal to (e.g., including approaching) the temperature of the sample heat transfer between the sample and the mechanical testing instrument is minimized
Data Source
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AI summary
Among other things, a heating jacket configured for heating a mechanical testing instrument having a probe is disclosed herein. The heating jacket includes a heating element including a jacket wall, and the jacket wall extends around a probe recess, the jacket wall is configured to receive a probe of a mechanical testing instrument within the probe recess, and the heating element is mechanically isolated from the probe with a probe gap. Additionally, a system to correct for thermomechanical drift in a mechanical testing assembly is disclosed herein. The system isolates the mechanical testing instrument from thermomechanical drift of a system frame using a determined difference between, for instance, a probe displacement and a sample displacement.