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激光散斑传感技术具有结构简单、灵敏度高等特点,可以实现对应力、振动、距离、速度、流速等物理量的传感测量,已成为光学传感领域中的研究热点之一。设计了一套基于激光散斑的应力传感系统。该系统使用波长为405 nm激光作为光源,利用音圈电机振动多模光纤,同时采用CCD图像传感采集系统对抛光玻璃表面进行显微成像,通过MATLAB软件对采集到的散斑图像进行分析处理,计算散斑对比度,拟合散斑对比度随时间变化的曲线。结果表明:散斑图像对比度的变化反应了多模光纤应力的变化,通过多模光纤应力变化可以判断是否有入侵者,实现了防盗功能。
The laser speckle sensing technique has the advantages of simple structure and high sensitivity, and can realize the sensing measurement of physical quantities such as stress, vibration, distance, velocity, flow velocity and the like, and has become one of the research hotspots in the field of optical sensing. A stress sensing system based on laser speckle was designed. The system uses 405 nm laser as light source, vibrates multi-mode optical fiber with voice coil motor, and uses CCD image acquisition system to carry out microscopic imaging on the polished glass surface. The collected speckle image is analyzed by MATLAB software , Calculated speckle contrast, the curve of the speckle contrast with time. The results show that the change of contrast of speckle image reflects the change of multimode fiber stress, and the intrusion can be judged by the change of stress of multimode fiber to realize the anti-theft function.