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首页> 外文期刊>Optics & Laser Technology >Design of a remote and integrated Sagnac interferometer that can generate narrowband guided wave through the use of laser and effective optics to detect defects occurred in plates
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Design of a remote and integrated Sagnac interferometer that can generate narrowband guided wave through the use of laser and effective optics to detect defects occurred in plates

机译：遥控和集成的SAGNAC干涉仪的设计，可以通过使用激光和有效光学器件来检测板材发生缺陷的窄带引导波

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To inspect the integrity of specimens that are moving or no space available to mount sensors on their surfaces, laser generated guided wave (GW) becomes the only feasible option. However, conventional GW generated by laser-based emission is in broadband frequency range. Hence, unwanted GW modes, along with the emitted desired GW mode, also get produced simultaneously to the inspected specimen. The results generated from reflected GW become chaotic, making the identification of GW signals truly reflected by defects very difficult. Hence, substantial research efforts have been spent on reducing unwanted GW modes by spatially modulating the laser pattern to emit narrowband GW. Previous methods to generate narrowband GW include the use of slit mask, diffractive grating, lenticular array, and interference of laser beam. Among these techniques, each has certain shortcomings. A recent research achievement is the design of the integrated optical Mach-Zehnder system (IOMZ) (J. Chen et al, Opt. Lett., 42, 4255, 2017). It can emit desired narrowband Lamb wave into the aluminum plate by using pulsed laser and the designed optical system. Although the results showed IOMZ's ability in emitting narrowband GW mode, significant unwanted noise was also generated, making the signal-to-noise ratio (SNR) of the received GW signals rather low. In this study a new optical system to overcome the shortcoming of the above reported devices is proposed. It is called integrated Sagnac interferometer-based optical system (SIOS) which can minimize generation of unwanted noise and substantially improve the SNR of reflected GW signals. A comparison study is also presented to illustrate the effectiveness of SIOS is superior to that of the IOMZ. Experimental results reveal that the proposed SIOS is promising for remote nondestructive testing and evaluation.
机译：为了检查正在移动的标本的完整性或没有可用于安装在其表面上的传感器的空间，激光产生的导波（GW）成为唯一可行的选择。然而，由基于激光的发射产生的传统GW是宽带频率范围。因此，不需要的GW模式以及发射的所需GW模式，也可以同时产生对被检查的标本产生。从反射的GW产生的结果变得混乱，使得识别真正被缺陷反射的GW信号非常困难。因此，通过在空间调制激光模式发射窄带GW来减少不需要的GW模式的实质性研究努力。以前的生成窄带GW的方法包括使用狭缝掩模，衍射光栅，透镜阵列和激光束的干扰。在这些技术中，每个技术都有一定的缺点。最近的研究成就是集成光学马克Zehnder系统（IOMZ）的设计（J. Chen等人，选择。Lett。，42,4255,2017）。通过使用脉冲激光和设计的光学系统，它可以将所需的窄带羊波吹入铝板中。虽然结果表明IOMZ在发射窄带GW模式方面的能力，但也产生了显着的不需要的噪声，使得所接收的GW信号的信噪比（SNR）相当低。在本研究中，提出了一种克服上述报告装置的缺点的新光学系统。它被称为基于集成的SAGNAC干涉仪的光学系统（SIOS），其可以最小化不需要的噪声的产生并基本上改善反射GW信号的SNR。还提出了比较研究以说明SIOS的有效性优于IOMZ。实验结果表明，拟议的SIO是对远程无损检测和评估的承诺。

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