测试原理是利用激光位移传感器扫描木材表面，提供特征信号，由傅里叶分析仪FFT记录时间信号的波形，计算机进行数据处理和分析判断。
The system is consisted of a laser sensor which provides scanning signal , a FFT analyser which records a curve and a personal computer which analyses and processes data from FFT analyser .
傅里叶分析仪