Abstract: By using low-frequency speaker as a vibration source and optical feedback self-mixing interference effect to convert infrasound vibration into self-mixing interference signal to detect the frequency and intensity, we design a compact and simple infrasound vibration and measurement device for experimental teaching. According to the result testing in the simulation environment of infrasound, this device can measure the infrasound signal correctly.

Key words: infrasound vibration, self-mixing interference, Fourier transform