基于互相关算法的单丝取向度测量方法

为保证单丝生产的品质，针对单丝取向度进行测量，提出基于互相关算法的单丝取向度测量方法。该方法采用声速法测量单丝取向度，选用STM32 作为微处理器，并设计了激励脉冲放大电路与接收信号处理电路。微处理器产生的单脉冲经激励脉冲放大电路后传递至发送端压电陶瓷传感器使其产生振动，接收信号处理电路对接收端的信号波形进行滤波、放大等操作后送至微处理器进行AD( Analog-to-Digital) 采集与存储。 根据相关性原理，计算传感器在不同位置的接收时间差，已知传感器移动距离，即可计算声音信号在单丝中的 声速，进而可通过公式计算得到取向度，经实验验证结果表明，测量精密度优于1%。

Method of Measuring Single Orientation Based on Cross-Correlation Algorithm

In order to ensure the quality of monofilament production，a measurement method of monofilament orientation based on cross-correlation algorithm is proposed，which uses sound velocity method to measure monofilament orientation． STM32 is selected as the microprocessor，the excitation pulse amplification circuit and the receiving signal processing circuit are designed． The single pulse generated by the microprocessor is transmitted to the piezoelectric ceramic sensor at the transmitter through the excitation pulse amplification circuit to generate vibration． The receiving signal processing circuit filters and amplifies the signal waveform at the receiver and sends it to the microprocessor for AD ( Analog-to-Digital) acquisition and storage． According to the principle of correlation，the receiving time difference of the sensor at different positions and the moving distance of the sensor are calculated． The sound velocity of the sound signal in the single wire can be calculated． The orientation degree can be calculated by formula． The experiment shows that the measurement precision of this method is better than 1%．