Wang Xing, Zhang Guang-Ming, Ma Hongwei, Zhang Yishu, Wang Doudou
School of Mechanical Engineering, Xi'an University of Science and Technology, Xi'an 710054, China.
General Engineering Research Institute, Liverpool John Moores University, Liverpool L3 3AF, UK.
Sensors (Basel). 2018 Feb 13;18(2):573. doi: 10.3390/s18020573.
In ultrasonic array imaging, 3D ultrasonic wavefields are normally recorded by an ultrasonic piezo array transducer. Its performance is limited by the configuration and size of the array transducer. In this paper, a method based on digital holographic interferometry is proposed to record the 3D ultrasonic wavefields instead of the array transducer, and the measurement system consisting of a pulsed laser, ultrasonic excitation, and synchronization and control circuit is designed. A consecutive sequence of holograms of ultrasonic wavefields are recorded by the system. The interferograms are calculated from the recorded holograms at different time sequence. The amplitudes and phases of the transient ultrasonic wavefields are recovered from the interferograms by phase unwrapping. The consecutive sequence of transient ultrasonic wavefields are stacked together to generate 3D ultrasonic wavefields. Simulation and experiments are carried out to verify the proposed technique, and preliminary results are presented.
在超声阵列成像中，三维超声波场通常由超声压电阵列换能器记录。其性能受阵列换能器的结构和尺寸限制。本文提出一种基于数字全息干涉术的方法来记录三维超声波场，以替代阵列换能器，并设计了由脉冲激光器、超声激励以及同步和控制电路组成的测量系统。该系统记录超声波场的一系列连续全息图。从不同时间序列记录的全息图计算干涉图。通过相位展开从干涉图中恢复瞬态超声波场的幅度和相位。将瞬态超声波场的连续序列堆叠在一起以生成三维超声波场。进行了仿真和实验以验证所提出的技术，并给出了初步结果。
