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Large angle and high linearity two-dimensional laser scanner based on voice coil actuators.

Xin Wu¹, Sihai Chen, Wei Chen

¹Wuhan National Laboratory for Optoelectronics, Wuhan, Hubei 430074, China. laser_hust@foxmail.com

The Review of Scientific Instruments

|November 4, 2011

Summary

A new two-dimensional laser scanner uses voice coil actuators for large-angle, high-linearity scanning. A closed-loop controller significantly reduces oscillations caused by mechanical resonances, improving performance.

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Area of Science:

Optoelectronics
Mechanical Engineering
Control Systems

Background:

Two-dimensional laser scanners are crucial for applications requiring precise beam steering.
Achieving both large deflection angles and high linearity in laser scanners presents significant engineering challenges.
Mechanical resonances often limit the operational performance and stability of scanning systems.

Purpose of the Study:

To develop a novel two-dimensional laser scanner with a large deflection angle and high linearity.
To implement an effective control strategy to mitigate performance limitations due to mechanical resonances.
To demonstrate the efficacy of a voice coil actuator direct driving mechanism and an in-house deflection angle detecting system.

Main Methods:

Utilized voice coil actuators for direct driving of the steering mirror to achieve large angular motion.
Employed a frequency sweep method with virtual instruments to determine the natural frequency of the laser scanner.
Developed and implemented a closed-loop controller based on a mathematical model, identified using MATLAB and experimental data.
Quantified nonlinearity before and after controller implementation.

Main Results:

The laser scanner demonstrated a significant reduction in nonlinearity from 13.75% to 2.67% at 50 Hz after controller implementation.
Mechanical resonances were identified as the primary limitation to the scanner's performance.
The developed system achieved a large deflection angle and maintained high linearity.
The controller effectively reduced oscillations at the resonance frequency.

Conclusions:

The developed two-dimensional laser scanner, driven by voice coil actuators, achieves high linearity and large deflection angles.
The closed-loop control strategy effectively suppresses mechanical resonance issues, enhancing scanner stability and performance.
This innovative design offers advantages in terms of scanning speed, mirror size, and overall mechanical structure, making it suitable for advanced applications.