Multi-layer PCB Thermal Management for Laser Detector Uniformity
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Solution Overview
Problem
Systems using laser detectors face reduced sensitivity due to low temperature and temperature variations across the detector surface, which can limit the range of guided projectiles relying on laser detection for targeting.
Innovation Solution
A multi-layer printed circuit board (PCB) assembly with a thermally-conductive ring, resistive elements, and thermally-conductive vias is used to maintain an even temperature distribution across the laser detector, incorporating a thermally-conductive heat-distribution region and plated-thru vias to transfer heat and reduce temperature variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the laser detector is operated in cold environments, then the system can function in diverse conditions, but the sensitivity of the laser detector reduces due to low temperature and temperature variation
Solution Approach 1:
A thermally conductive ring is introduced as an intermediary component between the heat source and the laser detector. This ring acts as a thermal mediator that evenly distributes heat across the detector surface, preventing direct thermal coupling that would cause hot spots while ensuring uniform temperature distribution for optimal sensitivity.
Solution Approach 2:
The system actively changes the temperature parameter of the laser detector by implementing heating control. Temperature sensors monitor the detector temperature and feedback control adjusts the heating power to maintain the detector within an optimal temperature range, transforming the detector's thermal state from cold/variable temperature to controlled stable temperature.
2Temperature
If heating elements are applied directly to the laser detector, then the temperature can be maintained, but hot and cold spots are created that reduce sensitivity
Solution Approach 1:
The heating function is segmented and distributed through multiple heating zones rather than a single concentrated heat source. The thermally conductive ring divides the heating area into multiple segments that collectively provide uniform heat distribution across the detector surface, eliminating localized hot spots.
Solution Approach 2:
The thermally conductive ring serves as a thermal intermediary that decouples the heating elements from direct contact with the detector. This intermediary layer spreads the thermal energy uniformly before it reaches the detector, preventing direct thermal coupling that would create temperature non-uniformities.
3Device complexity
If no temperature control is implemented, then the device complexity is low, but the sensitivity and range of the guided projectile are reduced
Solution Approach 1:
The PCB substrate is designed to serve multiple functions simultaneously: it provides mechanical support for the detector, acts as a thermal management platform with integrated heating zones, and incorporates temperature sensing capabilities. This multi-functionality reduces the need for separate dedicated components, balancing complexity with performance.
Solution Approach 2:
The heating elements, temperature sensors, and detector mounting structure are merged into a single integrated PCB assembly. The thermally conductive ring is integrated directly into the PCB layer structure, combining thermal management functions with the mechanical support function in one unified component rather than separate assemblies.
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 solution effectively maintains the laser detector within a predetermined temperature range, enhancing its sensitivity by minimizing hot and cold spots and ensuring consistent performance, especially in cold environments.
Implementation Method 1
a plurality of thermally-conductive shafts coupling the thermally-conductive ring to a thermally-conductive heat-distribution region. The thermally-conductive shafts transfer heat between the thermally-conductive heat-distribution region and the thermally-conductive ring
Implementation Method 2
The second layer 200 may comprise a plurality of resistive elements aligned with the thermally-conductive detector region to generate heat
Data Source
AI summary
Embodiments of a system to maintain an even temperature distribution across a laser detector are generally described herein. In some embodiments, the system includes a multi-layer printed circuit board (PCB) assembly that includes a first layer comprising a thermally-conductive ring provided circumferentially around a thermally-conductive detector region for mounting the laser detector, a second layer comprising a plurality of resistive elements aligned with the thermally-conductive detector region to generate heat, and a fourth layer comprising a thermally-conductive heat-distribution region aligned with the thermally-conductive detector region. A plurality of thermally-conductive vias is provided to couple the thermally-conductive ring of the first layer to the thermally-conductive heat-distribution region of the fourth layer. The thermally-conductive vias transfer heat between the thermally-conductive heat-distribution region and the thermally-conductive ring to provide an even distribution of heat across the laser detector.