Priming Light Flow for Deep Layer Heating
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Solution Overview
Problem
Existing methods for thermal treatment of materials, such as semi-conductors, using light flows struggle to efficiently heat deep portions of materials, as the heating depth is limited and costly, with thermal profiles typically peaking at the surface and decreasing towards the interior, making it difficult to achieve high temperatures without exceeding material limits like melting or vaporization temperatures.
Innovation Solution
A method involving a priming region with a different material, heated by a secondary light flow, which then heats the main layer through thermal diffusion to a high temperature range, allowing a main light flow to penetrate and raise the temperature of the layer from a low to a high temperature range, enabling deeper and more efficient heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If light flow is used to heat deep portions of material, then heating depth increases, but surface temperature exceeds material limits (melting/vaporization)
Solution Approach 1:
A priming light flow is applied before the main light flow to preheat the material to a temperature where the absorption coefficient becomes significant. This preliminary heating action enables the main light flow to be absorbed more effectively at depth without causing excessive surface heating, as the material is already in a temperature range where absorption occurs.
Solution Approach 2:
The invention exploits the temperature-dependent absorption coefficient by changing the temperature parameter of the material through priming. As temperature increases, the absorption coefficient increases, allowing the main light flow to penetrate deeper and be absorbed more effectively at the target depth, thereby resolving the contradiction between heating depth and surface temperature control.
2Productivity
If light flow intensity is increased to heat deep portions, then heating efficiency improves, but surface temperature exceeds material limits
Solution Approach 1:
The priming light flow performs a preliminary heating action that prepares the material to absorb the main light flow more effectively. This two-stage approach improves overall heating efficiency for deep portions while maintaining surface temperature control, as the priming phase creates the necessary absorption conditions without requiring excessive intensity from the main flow.
Solution Approach 2:
By changing the temperature parameter through priming, the material's absorption characteristics are modified to enable efficient energy absorption at depth. This parameter change allows the main light flow to be applied at optimal intensity levels that improve heating efficiency without causing surface overheating or material damage.
3Temperature
If conventional light flow heating is used, then surface heating is effective, but deep portion heating becomes difficult and costly
Solution Approach 1:
The priming light flow performs a preliminary action of heating the material to a temperature where absorption becomes significant. This enables subsequent deep heating by the main light flow, overcoming the limitation of conventional methods that only effectively heat the surface. The priming action creates the conditions necessary for deep portion heating without requiring extreme parameters.
Solution Approach 2:
The invention changes the temperature parameter of the material through priming, which fundamentally alters the absorption characteristics. This parameter change enables the main light flow to penetrate and heat deep portions effectively, resolving the contradiction between effective surface heating and difficult deep portion heating by operating in a temperature regime where absorption occurs at depth.
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 allows for efficient and localized heating of deep layers, achieving high temperatures with reduced surface heating, thus overcoming the limitations of traditional methods by creating an absorbent thermal front that progresses through the material, enabling effective thermal treatment of semi-conductors like silicon.
Implementation Method 1
the absorption of the light flows takes place at the exterior surface and/or in the vicinity of the exterior surface of parts
Implementation Method 2
the heating of deeper portions takes place through thermal diffusion from the exterior surface and/or from its vicinity receiving the light flow to deeper areas of the part to be treated
Implementation Method 3
the wavelength of said main light flow is chosen such that the coefficient of absorption of said flow by the material of the layer to be heated is low while the temperature of the material of said layer to be heated is in a low temperature range (PBT) and that this absorption coefficient sharply increases with temperature
Data Source
AI summary
The invention relates to a method and to a device for at least locally heating a plate including at least one layer (2) to be at least locally heated by at least one main, light flow pulse, and including at least one priming region (4) located deeply relative to the front surface of said layer to be heated, wherein the main flow (7) is capable of heating said layer to be heated (2) while the temperature of the latter is within a high temperature range (PHT), and a priming a secondary heating means (9) capable of heating said priming region from a temperature within a low temperature range (PBT) up to a temperature within said high temperature range (PHT).