Thermal Characterization Device for Contact Resistance
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Solution Overview
Problem
Current measurement devices for thermal conductivity fail to accurately estimate thermal characteristics, particularly contact thermal resistance, in thin heat conducting materials, leading to incomplete heat radiation efficiency assessment in electronic devices.
Innovation Solution
A measurement device using a unidirectional heat flow steady state comparison method with a three-layer structure and a heat-transfer promoting agent to reduce contact thermal resistance, allowing for accurate measurement of thermal conductivity and contact thermal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If prior measurement devices for thermal conductivity are used, then thermal conductivity measurement is possible, but contact thermal resistance cannot be accurately estimated especially in thin heat conducting materials
Solution Approach 1:
The measurement device segments the thermal resistance measurement into two distinct components: contact thermal resistance and material thermal resistance. By using multiple measurement configurations (with and without the heat conducting material), the device can separately quantify each component, enabling accurate measurement of contact thermal resistance even in thin materials where it dominates the total thermal resistance.
Solution Approach 2:
The invention changes the measurement parameters by introducing interface pressure as a controllable variable. By systematically varying the interface pressure between the heat conducting material and the measurement device components, the device can characterize the pressure-dependent contact thermal resistance, providing comprehensive thermal performance data for thin materials under different operating conditions.
2Reliability
If heat conducting materials with high thermal conductivity are developed, then heat radiation efficiency improves, but contact thermal resistance becomes the dominant factor in thin materials
Solution Approach 1:
The measurement device extracts and isolates the contact thermal resistance component from the total thermal resistance measurement. By using reference measurements (without the heat conducting material) and subtracting the contact resistance contribution, the device can determine the true material thermal resistance, enabling accurate assessment of heat conducting materials even when contact resistance dominates the total value.
3Ease of operation
If interface pressure and surface roughness are not controlled, then measurement simplicity is maintained, but measurement accuracy deteriorates
Solution Approach 1:
The measurement device incorporates feedback mechanisms by continuously monitoring interface pressure and adjusting measurement parameters accordingly. The system uses measured data to calculate and compensate for contact thermal resistance effects, providing accurate thermal characteristic estimates even when interface conditions vary, thus maintaining both operational simplicity and measurement precision.
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
Enables precise estimation of thermal characteristics with high accuracy, reducing the impact of interface pressure and surface roughness, and shortening measurement time, thereby improving heat radiation efficiency in electronic devices.
Implementation Method 1
a heat-transfer promoting agent to reduce contact thermal resistance
Implementation Method 2
unidirectional heat flow steady state comparison method with a three-layer structure
Data Source
Figure 1
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AI summary
To provide a measurement device for estimating thermal characteristics by using a unidirectional heat flow steady state comparison method, which can measure a value of contact thermal resistance of an object to be measured, a value of thermal resistance and thermal conductivity and can applies an adequate thermal measurement and analysis technology by an interface pressure dependency of the object to be measured, a technique for thermal contact and a heat-transfer promoting effect, and has high reliability. A measurement device 1 for estimating thermal characteristics comprises; a heat generating source unit 4 that has heat sensors 4g1 and 4g2 for detecting heat radiating toward a measurement sample unit 5, and that heats the measurement sample unit 5; the measurement sample unit 5; and a heat cooling source unit 6 that has heat sensors 6c1 and 6c2 for detecting heat radiating from the measurement sample unit 5, and that cools the measurement sample unit 5, wherein those units are sequentially stacked, the measurement sample unit 5 has a three-layer structure consisting of an object 5b to be measured for estimating thermal characteristics, and heat conducting materials 5a and 5c that sandwich the object, the heat conducting materials 5a and 5c are adhered to the heat generating source unit 4 and the heat cooling source unit 6 one another through a heat-transfer promoting agent therebetween, the object 5b to be measured for estimating thermal characteristics and the heat conducting materials 5a and 5c are adhered to one another through physical contact, chemical contact, and/or chemical bond contact.