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The α-β circular scanning with large range and low noise
1Centre of Ultra-Precision Optoelectronic Instrument Engineering, Harbin Institute of Technology, Harbin, China.
Journal of Microscopy
|March 16, 2017
Summary
A novel circular scanning method enhances scanning range by 57% and speed by 7.8% compared to raster scanning. This technique reduces noise and vibration, potentially extending galvanometer lifetime for applications in optical imaging and fabrication.
Area of Science:
- Optics and Photonics
- Mechanical Engineering
- Signal Processing
Background:
- Raster scanning, a common technique, utilizes sawtooth signals, leading to inefficiencies due to flyback periods.
- High scanning acceleration in traditional methods causes noise and reduces equipment lifespan.
Purpose of the Study:
- To introduce and validate a new circular-route scanning method, termed α-β circular scanning.
- To improve scanning efficiency, range, and system longevity compared to existing methods.
Main Methods:
- Implementation of α-β circular scanning using sinusoidal signals with a π/2 phase difference.
- Experimental comparison of α-β circular scanning with traditional raster scanning.
Main Results:
- Achieved a 57% larger scanning range within the effective optical field of view compared to raster scanning.
- Increased scanning speed by 7.8% by utilizing the entire sine wave, eliminating flyback losses.
- Reduced maximum scanning acceleration by a factor of 44, significantly decreasing noise and vibration.
Conclusions:
- α-β circular scanning offers superior performance in terms of range, speed, and reduced mechanical stress.
- The method promises extended galvanometer lifetime and improved system stability.
- Potential applications include scanning imaging, optical tweezers, and laser-beam fabrication.
