Laser Power Control via Thermal Radiation Feedback
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Solution Overview
Problem
Current laser annealing devices require a long time to stabilize power measurements, leading to significant degradation in throughput due to the need for about one minute to achieve measurement accuracy with existing power meters.
Innovation Solution
A laser power control device and method that uses a heat radiation sensor to measure and store relational data associated with laser beam power, allowing for rapid estimation and adjustment of laser beam power on a machining surface, reducing the time needed for power adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a power meter is used to measure laser beam power, then measurement accuracy is improved, but measurement time increases significantly
Solution Approach 1:
The patent uses a heat radiation sensor to measure the heat radiation from an irradiation object that has been exposed to the laser beam, rather than directly measuring the laser beam power. This creates an indirect measurement copy that provides both speed and accuracy, resolving the contradiction between measurement time and accuracy.
Solution Approach 2:
The heat radiation sensor acts as an intermediary between the laser beam and the measurement system. Instead of directly measuring the laser beam, the system measures the heat radiation emitted by the irradiation object after laser exposure, providing accurate power measurement without the long stabilization time of direct power meter measurement.
2Manufacturing precision
If power measurement and adjustment is performed frequently, then power control accuracy is improved, but throughput degradation increases
Solution Approach 1:
By using heat radiation measurement as an indirect copy of laser power, the system enables rapid power verification without the time-consuming direct measurement process, allowing frequent power checks that maintain accuracy while preserving throughput.
Solution Approach 2:
The system performs power measurement during the actual machining process rather than requiring separate pre-machining measurement steps. The heat radiation measurement occurs naturally during laser irradiation, eliminating additional time requirements and enabling continuous monitoring that maintains both precision and productivity.
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 enables quick and accurate power adjustments, improving the throughput of laser annealing devices by eliminating the need for prolonged measurement times and optimizing power control during machining processes.
Implementation Method 1
a heat radiation sensor that measures heat radiation of an irradiation object irradiated with a laser beam
Data Source
AI summary
A laser power control device includes a storage unit that stores relational data having a measurement value of a heat radiation sensor, which measures intensity of heat radiation of an irradiation object irradiated with a laser beam from a laser machining device in association with a power value of the laser beam on a machining surface of the laser machining device.