Generation of a steerable ultrasonic beam using a phased array of low power semiconductor laser sources and fiber optic delivery
Generation of a steerable ultrasonic beam using a phased array of low power semiconductor laser sources and fiber optic delivery
复制标题
使用低功率半导体激光源相控阵和光纤传输生成可操纵超声波束
DOI：
10.1088/0964-1726/16/3/020
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发表时间：
2007
影响因子：
4.1
通讯作者：
B. Culshaw
中科院分区：
文献类型：
--
作者：
C. Swift;S. Pierce;B. Culshaw
利用线性光纤阵列将8个低功率(1.5W)半导体激光器的光功率传输到铝板上。光纤排列成线性相控阵。然后利用高达520 ns的时间延迟来调整阵列中各单元的激励，从而允许在阵列间距为8 mm的情况下将产生的超声波波束的方向控制在最大18°的角度。激励采用3.6微焦耳激光脉冲的形式，因此是真正的非破坏性的。使用压电式传感器或干涉型光纤传感器实现检测。
A linear array of optical fibers was used to deliver optical power from 8 low power (1.5 W) semiconductor laser sources to an aluminum plate. The optical fibers were arranged to form a linear phased array. Time delays of up to 520 ns were then utilized to adjust the excitation of the elements in the array, thus allowing the direction of the generated ultrasonic beam to be controlled at angles of up to 18° for an array spacing of 8 mm. Excitation was in the form of 3.6 µJ laser pulses and hence was truly non-destructive. Detection was achieved using piezoelectric transducers or interferometric fiber optic sensors.