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在钢板的生产和使用过程中,钢板厚度的测量极其重要。传统的激光三角法不适合测量粗糙表面物体和多散射介质的厚度。基于硅酸铋光折变晶体搭建了一套自适应的双波混合干涉仪系统,使用该系统精确测量了铝块的厚度。由于光折变效应形成的全息光栅使信号光和参考光发生衍射,解调出超声振动信号。动态全息光栅的形成,能自动滤除环境引起的低频扰动。该系统在厚度测量、粗糙面超声振动测量中具有灵敏度高、调节方便、非接触、价格相对便宜等特点,将来与激光超声技术相结合在内部缺陷检测上有非常广阔的前景。
In the steel production and use of the process, the measurement of steel thickness is extremely important. Conventional laser triangulation is not suitable for measuring the thickness of rough surface objects and multiple scattering media. Based on the bismuth silicate photorefractive crystal, a set of adaptive dual-wave hybrid interferometer system is set up and the thickness of the aluminum block is accurately measured by the system. The holographic grating formed by the photorefractive effect diffracts the signal light and the reference light to demodulate the ultrasonic vibration signal. The formation of dynamic holographic grating, can automatically filter out low-frequency environment caused by disturbance. The system has the characteristics of high sensitivity, convenient adjustment, non-contact and relatively low price in thickness measurement and rough surface ultrasonic vibration measurement. In the future, it has a very broad prospect in the detection of internal defects with laser ultrasonic technology.