Miniaturization of Digital Holographic Optical System for Displacement and Strain Measurement Using Multiple Imaging Device

有效的应变测量技术是检测基础设施缺陷的必要条件。相移数字全息是一种方便的测量位移和应变分布的方法。为了生产更紧凑的实用设备，需要简化光学装置。作者提出了一种利用多成像装置测量位移和应变的方法。研制了一种由5个成像器件组成的光学装置。提出了一种简单的移相光学装置，利用球面波为每个成像设备提供参考波。验证了该方法的有效性。

Efficient strain measurement technique is required to inspect defects in the infrastructure. Phase-shifting digital holography is a convenient method to measure displacement and strain distributions. To simplify the optical setup is required for producing more compact equipment for practical use. Authors proposed a method to measure displacement and strain using multiple imaging devices. An optical setup using five imaging devices was developed. A simple phase-shifting optical setup to provide reference wave to each imaging device using a spherical wave was proposed. The effectiveness of this proposed method was confirmed.