探伤车超声波检测系统基准灵敏度确定方法

Method for Determining Reference Sensitivity of Ultrasonic Testing System of Flaw Detection Car

探伤车高速检测在役钢轨时,其超声波各通道灵敏度通常依据相应通道的杂波分布进行实时调整,当超声波通道杂波较多时,降低该通道灵敏度以减少杂波,但灵敏度降低增大了钢轨伤损漏检的风险,确定检测过程中的基准灵敏度是保证探伤车检测效果的关键。通过分析探伤车超声波检测伤损判读原理,对比探伤车与探伤仪基准灵敏度的异同,提出探伤车超声波检测系统在不同速度条件下各超声波通道基于超声波A显扫查间距的基准灵敏度确定方法。在实验室条件下,对该方法确定的不同速度下基准灵敏度进行了验证。结果表明:该基准灵敏度确定方法可行有效。

When the in-service rail is detected by a flaw detection car at a high speed,the sensitivity of each ultrasonic channel is usually adjusted in real time according to the clutter distribution of the corresponding channel.When the ultrasonic channel has more clutter,the sensitivity of this channel will be lowered to reduce clutter,but the lowering of sensitivity increases the risk of missing detection of rail damage.The key to ensuring the testing effect of flaw detection car is to determine the reference sensitivity during testing.By analyzing the ultrasonic testing damage interpretation principle of the flaw detection car and comparing the similarities and differences in reference sensitivity between flaw detection car and flaw detector,this paper proposes a method for determining the reference sensitivity of each ultrasonic channel based on the ultrasonic A displayed traveling length under different speed conditions of ultrasonic testing system of flaw detection car.The reference sensitivity at different speeds determined with this method is validated under laboratory conditions.The results show that the method for determining the reference sensitivity is feasible and effective.