Laser Sensor Mirror Control via Feedforward Transient Compensation
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Solution Overview
Problem
Existing laser sensors face instability in rapidly changing the angle of the mirror, leading to potential distortion and reduced resolution due to transient characteristics and response delays, especially during zoom control operations.
Innovation Solution
Incorporating a feedforward circuit with a transient model and a target model to generate a driving waveform that stabilizes the mirror's angle change by using a response improvement filter and a target response filter, which corrects the amplitude and phase commands based on the ratio between the transient and target models.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the mirror amplitude is rapidly changed to enable fast zoom control, then the responsiveness is improved, but the transient characteristics cause instability and distortion
Solution Approach 1:
The feedforward control circuit pre-calculates and applies compensation signals based on the known transient characteristics of the mirror system. By anticipating the instability that will occur during rapid amplitude changes and applying corrective action in advance, the system maintains stability while achieving fast zoom control.
Solution Approach 2:
The control system uses feedback from the actual mirror amplitude to correct deviations from the target amplitude. The feedback control circuit adjusts the driving signal based on the difference between the target and actual amplitudes, compensating for transient instability and ensuring the mirror reaches and maintains the desired angle.
2Productivity
If the mirror amplitude is rapidly changed, then the zoom control speed is improved, but the resolution is reduced due to transient characteristics
Solution Approach 1:
The system pre-calculates the optimal driving waveform that accounts for transient characteristics, ensuring that the mirror reaches the target amplitude smoothly without oscillations that would degrade resolution. This preliminary preparation of the control signal allows fast zoom control while maintaining measurement precision.
Solution Approach 2:
Feedback control continuously monitors the actual mirror amplitude and adjusts the driving signal to eliminate deviations. This ensures that the mirror stabilizes at the correct amplitude with high precision, maintaining resolution even during rapid zoom operations.
3Device complexity
If a simple driving signal is used, then the device complexity is reduced, but the transient response causes amplitude errors
Solution Approach 1:
The feedforward control circuit acts as an intermediary between the target amplitude command and the actual mirror driving signal. It introduces a compensation component that accounts for transient characteristics, improving amplitude accuracy without requiring complex hardware modifications to the mirror itself.
Solution Approach 2:
The feedback control circuit measures the actual mirror amplitude and generates corrective signals to eliminate amplitude errors. This closed-loop approach maintains high amplitude accuracy while keeping the overall device complexity manageable by using standard control components.
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 stable and timely control of the mirror's angle, reducing amplitude errors and maintaining resolution during zoom operations by anticipating and matching the target amplitude and phase changes, thus improving responsiveness and stability.
Implementation Method 1
a light emission element configured to emit laser light
Implementation Method 2
a light receiving element configured to receive the reflected light from the object
Data Source
AI summary
A laser sensor includes: a mirror configured to scan a reflection angle of laser light; a driving waveform generation circuit configured to generate a waveform of a driving signal that controls an amplitude of the mirror, according to an amplitude command value based on a target amplitude that defines a scanning range of the mirror; and a feedforward circuit configured to reflect a transient model in a case where the amplitude of the mirror transiently changes with time according to the driving signal in a case where the target amplitude is changed and a target model of a temporal change of the amplitude of the mirror on the amplitude command value through feedforward control.