介绍了一种用于实时傅里叶变换的线性调频变换运算法.这种方法依靠有大时间带宽积的声光卷积器.获得了对于傅里叶变换的约为75兆赫的瞬时带宽,在连续波时间选通波形下,动态范围超过60分贝.用通过器件的接近均匀的光束强度,测得旁瓣振幅在理论值的0.5分贝内.测得相应相位误差小于5°.不难演示这种声测运算法的灵活性,用它可以使旁瓣加权函数和变换的时间变率两者都变化. A linear FM transform algorithm for real-time Fourier transform is introduced, which relies on an acousto-optic convolver with a large time-bandwidth product, obtains an instantaneous bandwidth of about 75 MHz for Fourier transform, With continuous wave time gated waveform, the dynamic range exceeds 60 decibels and the sidelobe amplitude is measured within 0.5 decibels of the theoretical value using a nearly uniform beam intensity across the device. The corresponding phase error is measured to be less than 5 °. The flexibility of this acoustical algorithm allows it to vary both the sidelobe weighting function and the transformed time variability.