In this paper, a new method is proposed for the measurements of the performance parameters of finite sized large area material samples in free field by using broadband pulse compression technique, therefor the low-frequency cutoff of the standard tests are obviously reduced. 本文提出一种新的自由场测量方法,即应用宽带脉冲压缩技术在消声水池中测量有限尺寸的大面积材料样品的性能参数,从而使这种标准测量的低频限被明显降低。