Dynamic Detection Count for Laser Light Control
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Solution Overview
Problem
Existing optical control devices for semiconductor lasers face challenges in quickly adjusting the light amount of the laser beam to a target value due to unstable light detection immediately after the drive current is initiated, leading to potential unsatisfactory control and prolonged time to reach the target value.
Innovation Solution
The optical control device includes a semiconductor laser, a light amount detecting unit, and a controller that references a smaller number of detection results when the drive current first starts flowing to quickly adjust the light amount and a larger number once the target value is reached for stable control, allowing for efficient adjustment and stabilization of the light amount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the controller refers to a large number of detection results when the drive current first starts flowing, then the control precision is improved, but the response time deteriorates and the light amount cannot be adjusted quickly to the target value
Solution Approach 1:
The controller dynamically changes the number of detection results it refers to based on the operational state of the semiconductor laser. When the drive current first starts flowing, the controller refers to a smaller number of detection results (e.g., 1-3 results) to enable quick response. After the light amount reaches the target value, the controller increases the number of detection results referred to (e.g., 5-10 results) to improve control precision. This dynamic adjustment resolves the contradiction between response time and control precision.
Solution Approach 2:
The controller changes the parameter of 'number of detection results referred to' based on the operational phase. In the initial phase when drive current starts flowing, the parameter is set to a smaller value for fast response. In the stable phase after reaching target value, the parameter is increased for precise control. This parameter change strategy effectively resolves the technical contradiction.
2Speed
If the controller refers to a small number of detection results when the drive current first starts flowing, then the response time is improved, but the control stability deteriorates
Solution Approach 1:
The system dynamically adjusts the number of detection results referred to based on the operational state. During the initial adjustment phase, a smaller number is used for fast response. Once the light amount reaches the target value, the system transitions to using a larger number of detection results to ensure stable control. This dynamic adaptation resolves the contradiction between speed and stability.
Solution Approach 2:
The controller performs preliminary action by using a smaller number of detection results during the initial phase to quickly bring the light amount close to the target value. After this preliminary adjustment, the controller then uses a larger number of detection results to refine and stabilize the control. This two-stage approach resolves the contradiction between speed and stability.
3Loss of time
If the light amount is controlled by referring to unstable detection results immediately after drive current starts flowing, then the response time is reduced, but the control accuracy deteriorates due to overshoot and fluctuation
Solution Approach 1:
The controller dynamically adjusts the number of detection results referred to based on the stability of the light amount. When the drive current first starts flowing and the light amount is unstable, the controller refers to a smaller number of detection results to enable quick response while accepting some instability. After the light amount reaches the target value and becomes stable, the controller refers to a larger number of detection results to ensure high control accuracy. This dynamic adjustment resolves the contradiction between response time and control accuracy.
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 rapid adjustment of the light amount to the target value and maintains stable control by varying the number of detection results referenced, effectively addressing the instability issues and ensuring satisfactory control of the laser beam.
Implementation Method 1
a light amount detecting unit that detects a light amount of the light generated by the semiconductor laser
Data Source
AI summary
An optical control device includes a semiconductor laser that generates a light according to a drive current, a light amount detecting unit that detects a light amount of the light generated by the semiconductor laser; and a controller that controls the drive current to adjust the light amount to a target value by referring to a referring number of detection results of the light amount by the light amount detecting unit. The referring number at a time when the controller starts the drive current flowing is smaller than the referring number after the detection result of the light amount reaches a predetermined value.