Semiconductor-Free Peltier Sensor for High-Power Laser Detection
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Solution Overview
Problem
Current radiation sensors fail to accurately measure high-energy laser radiation with powers greater than 100 watts due to overheating, which can damage the sensor and lead to measurement errors, and existing Peltier elements are not suitable for such high radiation levels.
Innovation Solution
A high-performance radiation sensor using semiconductor-free, ductile thermopiles with specific materials and configurations, such as nickel and iron, to achieve efficient heat dissipation and maintain sensitivity, while minimizing thermal resistance and mechanical stress, allowing the sensor to operate effectively at high radiation powers without melting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional laser radiation sensors are used to measure high-power laser radiation, then measurement capability is provided, but the sensor overheats and gets damaged at radiation powers greater than 100 watts
Solution Approach 1:
The patent changes the material parameters of the thermopile from conventional semiconductor materials to metal-based materials (such as copper-constantan or copper-alumel), which fundamentally alters the thermal and electrical properties. This parameter change enables the sensor to withstand high temperatures and high-power laser radiation while maintaining measurement capability.
Solution Approach 2:
The patent employs composite material structures combining different metals with complementary properties. The thermopile uses dissimilar metal layers (copper and constantan or alumel) that are thermally and electrically conductive, creating a composite structure that dissipates heat effectively while generating measurable voltage signals from thermal gradients.
2Temperature
If Peltier elements are used for high-power radiation measurement, then heat dissipation capability is improved, but sensitivity is reduced
Solution Approach 1:
The patent applies local quality by creating controlled thermal gradients within the sensor structure. Different regions of the thermopile experience different temperatures, with the front surface absorbing radiation and the rear surface cooled by a heat sink. This localized temperature differentiation maintains sensitivity while allowing overall heat dissipation.
Solution Approach 2:
The patent introduces a third dimension (depth/thickness) to the thermopile structure to enable heat dissipation pathways. By extending the thermopile layers through the thickness of the sensor and providing thermal conduction paths to the rear surface and heat sink, the design adds dimensional complexity that facilitates heat removal without compromising surface sensitivity.
3Measurement precision
If semiconductor-based Peltier elements are used, then sensitivity to small radiation fluctuations is achieved, but the sensor cannot handle radiation outputs greater than tens of watts
Solution Approach 1:
The patent replaces fragile semiconductor thermopiles with robust metal-based thermopiles that are mechanically stronger and thermally more stable. While metal thermopiles have lower Seebeck coefficients, their superior mechanical and thermal robustness makes them suitable for high-power applications where semiconductor materials would fail or degrade.
4Temperature
If the Peltier element structure is optimized for heat dissipation, then thermal resistance is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent segments the Peltile element into distinct functional layers: radiation-absorbing front surface, alternating thermopile layers for voltage generation, thermally conductive backing layer, and cooled rear surface. This segmentation allows each layer to be optimized for its specific function while maintaining overall manufacturability through standardized layering processes.
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 sensor maintains sensitivity and mechanical robustness, preventing overheating and damage from high-energy laser radiation, enabling accurate measurement of radiation powers up to 1000 watts with controlled temperature distribution and signal resolution.
Implementation Method 1
The first and second materials A, B should each have a Seebeck coefficient, measured relative to platinum at 273 K, of greater than 6 μV/K or less than or equal to 15 μV/K
Implementation Method 2
the total thermal resistance of the entire Peltier element P parallel to the transverse direction Q, in the thermal flow direction, from the top to the bottom of the entire Peltier element P must be kept as small as possible
Data Source
Figure 1
AI summary
It is proposed to use a Peltier element (P) as a high-performance radiation sensor for electromagnetic radiation at wavelengths of up to 20 µm with radiation power outputs greater than 100 watts, wherein an electrical voltage is measured at the Peltier element (P) according to the radiation-induced heat flow in the transverse direction (Q) of the Peltier element (P), wherein the Peltier element (P) has a thermally active layer made up of alternately arranged first thermopiles (1) comprising a first material (A) and second thermopiles (2) comprising a second material (B), and the thermopiles (1, 2) are formed without semiconductors.