聚合物混合状态检测中信号特征提取技术研究

Study on signal characteristic extracting technology to monitor the mixing status of polymer

针对螺杆挤出机中聚合物挤出过程的混合状态的在线检测要求,研究聚合物混合状态的超声波脉冲检测的特征信号的提取技术。通过研究超声波在聚合物中的速度和能量的衰减,推测分散在基体中的分散状态等混合物的状态。实验表明:通过差分法提取聚合物混合物和单一聚合物的特征信号,可以明显提高特征值的精确度,获得较好的效果。本文为聚合物混合状态在线检测特征信号的提取提供方法参考。

As a response to the need of on-line monitoring for mixing status of polymer during screw extrusion,the signal characteristic extracting technology was studied to monitor the mixing status of polymer. The mixing status of polymer can be speculated from velocity and attenuation of ultrasonic wave propagation during the polymer. The experimental results indicate that using the difference method can improve the precision of ultrasonic wave signal characteristic. This paper provide a signal characteristic extracting method for on-line monitoring the mixing status of polymer.