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基于多层介质中超声波的传播特性,依据c2=△f×2d这一公式,运用频谱分析的方法,对6 MnR基体上厚度分别为1000μm、1400μm、1800μm的316L不锈钢爆炸焊薄层进行了测量。实验选用标称频率为5 MHz和10 MHz的探头,对样品的三个台阶分别取2次波、3次波、4次波的波形。通过对实验结果的分析和比较可得:选用5 MHz探头3次波形功率谱测量的薄层厚度与实际厚度最接近。
Based on the propagation characteristics of ultrasonic waves in multi-layered media, 316L stainless steel explosive welding thin films with thickness of 1000μm, 1400μm and 1800μm respectively on 6 MnR substrate were measured by spectrum analysis according to c2 = Δf × 2d . Experiments using the nominal frequency of 5 MHz and 10 MHz probe, the sample of the three steps were taken 2, 3, 4 waveforms. Through the analysis and comparison of the experimental results, it can be concluded that the thin layer thickness measured by the power spectrum of 3 times of 5 MHz probe is the closest to the actual thickness.