Duma Virgil-Florin, Lee Kye-sung, Meemon Panomsak, Rolland Jannick P
Department of Product Design, Aurel Vlaicu University of Arad, 77 Revolutiei Ave., Arad 310130, Romania.
Appl Opt. 2011 Oct 10;50(29):5735-49. doi: 10.1364/AO.50.005735.
We analyze the three most common profiles of scanning functions for galvanometer-based scanners (GSs): the sawtooth, triangular and sinusoidal functions. They are determined experimentally with regard to the scan parameters of the input signal (i.e., frequency and amplitude). We study the differences of the output function of the GS measured as the positional error of the oscillatory mirror from the ideal function given by the input signal of the device. The limits in achieving the different types of scanning functions in terms of duty cycle and linearity are determined experimentally for the possible range of scan parameters. Of particular importance are the preservation of an imposed duty cycle and profile for the sawtooth function, the quantification of the linearity for the sinusoidal function, and the effective duty cycle for the triangular, as well as for the other functions. The range of scan amplitudes for which the stability of the oscillatory regime of the galvo mirror is stable for different frequencies is also highlighted. While the use of the device in certain scanning regimes is studied, certain rules of thumb are deduced to make the best out of the galvoscanner. Finally, the three types of scanning functions are tested with a Fourier domain optical coherence tomography (FD OCT) setup and the conclusions of the study are demonstrated in an imaging application by correlating the determined limits of the scanning regimes with the requirements of OCT.
我们分析了基于振镜的扫描仪（GSs）三种最常见的扫描函数曲线：锯齿波、三角波和正弦波函数。根据输入信号的扫描参数（即频率和幅度）对它们进行了实验测定。我们研究了以振荡镜的位置误差相对于设备输入信号给出的理想函数来衡量的GS输出函数的差异。针对扫描参数的可能范围，通过实验确定了在占空比和线性度方面实现不同类型扫描函数的限制。特别重要的是锯齿波函数的规定占空比和曲线的保持、正弦波函数线性度的量化、三角波以及其他函数的有效占空比。还突出了振镜在不同频率下振荡状态稳定的扫描幅度范围。在研究该设备在某些扫描模式下的使用时，推导出了一些经验法则以充分利用振镜扫描仪。最后，使用傅里叶域光学相干断层扫描（FD OCT）装置对这三种扫描函数进行了测试，并通过将确定的扫描模式限制与OCT的要求相关联，在成像应用中展示了该研究的结论。
