Y type and s type dual - path saw mass sensors have been tested and analysed in detail . their frequency domain characteristics and time domain characteristics have been tested under non - oscillatory mode . transmission characteristics of y type s type and " - " type saw mass sensors are derived by p matrix representation . primary delay signal triple reflection signal and quintuple reflection signal of these sensor devices have been analysed in detail 结果表明，在正常工作模式下， y型和s型双声路声表醚质量传感器件的三次渡越反射信号和五次渡越反射信号比“一”字型双声路声表醚质量传感器件的三次渡越反射信号和五次渡越反射信号分别小12db 、 16 . 67db和n _ . sdb ? 17 . 3db 。
