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The α-β circular scanning with large range and low noise.

J Liu¹, X You¹, Y Wang¹

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.

Keywords:

Distortion galvanometer large range low noise scanning

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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.