Because inclined cracks are more harmful to pressurized tanks than parallel cracks, the existing ultrasonic testing methods cannot meet the needs of on-line monitoring for pressure vessels. Therefore, in this paper, inclined cracks in a pressure vessel are studied by using optical fiber ultrasonic sensor technology. The relationship between the oblique angle of the inclined cracks, the time when the peak voltage signal appears and the peak voltage is discussed by using the ultrasonic reflection method. Based on the experiment, the mathematical relationship between the slope angle and the time of the peak voltage signal is modified, and then the simplified safety assessment parameters of the slope crack are modified.

由于倾斜裂纹比平行裂纹对压力容器的危害更大，现有的超声波检测方法不能满足压力容器在线监测的需要。因此，本文利用光纤超声波传感器技术对压力容器中的倾斜裂纹进行了研究。利用超声反射法讨论了倾斜裂纹的斜角、峰值电压信号出现的时间与峰值电压之间的关系。在实验的基础上，修正斜坡角度与峰值电压信号时间的数学关系，进而修正斜坡裂缝的简化安全评估参数。