Heat Spreader for Mobile Thermal Sensor Accuracy
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Solution Overview
Problem
Thermopile systems in portable devices face temperature measurement errors due to internal heat generation and external thermal gradients, which can cause temperature fluctuations and inaccuracies, especially when heat is distributed unevenly across the device.
Innovation Solution
A mobile thermal sensor system incorporating a heat spreader, such as a heat sink, is used to dissipate heat evenly across the substrate, ensuring that thermopiles and a reference temperature detector operate at consistent temperatures, thereby minimizing thermal gradient errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If thermopile systems are used in portable devices, then temperature measurement capability is provided, but temperature measurement accuracy deteriorates due to internal heat generation and external thermal gradients
Solution Approach 1:
A heat spreader is introduced as an intermediary component between the substrate and the thermopile system. This heat spreader receives heat from the substrate and distributes it uniformly across the thermopile components, preventing direct thermal coupling that would cause measurement errors. The heat spreader acts as a thermal mediator that decouples the harmful heat generation from the sensitive temperature measurement function.
Solution Approach 2:
The heat spreader is designed to create uniform temperature distribution across all thermopile components and the reference temperature detector. By ensuring homogeneous thermal conditions, the system eliminates temperature gradients that would otherwise cause differential heating and measurement inaccuracies. The heat spreader achieves this through its high thermal conductivity and geometric design that promotes even heat distribution.
2Reliability
If thermopile systems operate in portable devices, then temperature sensing function is enabled, but measurement reliability deteriorates due to thermal fluctuations from uneven heat distribution
Solution Approach 1:
The heat spreader serves as a thermal buffer and mediator that isolates the thermopile system from rapid temperature changes in the substrate. It absorbs and redistributes thermal energy, smoothing out thermal fluctuations and providing stable operating conditions for accurate temperature measurement. This intermediary function enhances measurement reliability by preventing direct transmission of thermal transients.
Solution Approach 2:
The heat spreader maintains homogeneous temperature across all sensing elements during thermal transients. By ensuring uniform heat distribution even during changing thermal conditions, the system prevents differential thermal expansion and varying response times that would compromise measurement reliability. The homogeneous thermal field ensures all components experience identical thermal environments.
3Measurement precision
If heat spreader is added to the thermopile system, then thermal gradient errors are reduced, but device complexity increases
Solution Approach 1:
The heat spreader is a single intermediary component that performs multiple thermal management functions simultaneously. Rather than requiring complex active control systems, multiple sensors, or sophisticated thermal isolation mechanisms, a single heat spreader component provides passive thermal equalization. This simplifies the overall system architecture while achieving the desired measurement precision.
Solution Approach 2:
The heat spreader achieves homogeneous temperature distribution through its inherent material properties and geometric design, eliminating the need for complex active thermal control systems. The passive thermal equalization function is built into the component structure itself, reducing system complexity while maintaining high measurement precision across all thermopile elements.
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
The heat spreader effectively eliminates or reduces thermal fluctuations and gradients, allowing for accurate temperature measurements in mobile devices, even under conditions of internal heat generation or external radiation, enhancing the reliability of thermopile systems.
Implementation Method 1
a heat spreader coupled to the substrate... the heat spreader is configured to contact the mobile thermal sensor system and disperse heat
Implementation Method 2
A thermopile can include an electronic device that converts thermal energy into electrical energy... generate an output voltage proportional to a local temperature difference or a temperature gradient
Data Source
AI summary
A mobile thermal sensor system, a mobile device case, and a process for fabricating a mobile thermal sensor system are described that include using a heat spreader (e.g., a heat sink). In an implementation, the mobile thermal sensor system includes a substrate configured to support an electrical component; a thermal detector package coupled to the substrate, the thermal detector package including a first thermopile, a second thermopile, and a reference temperature detector; and a heat spreader coupled to the substrate. In another implementation, a mobile device case can include a case configured to house a mobile device, where the mobile device includes a mobile thermal sensor system.