Laser heterodyne interference signal processing system based on AD8302

In order to overcome defects of the traditional phase measurement hardware, such as circuit complexity, low measurement precision and narrow band width, a novel signal processing system of a laser heterodyne interferometer was designed based on AD8302 with good performance. The work theory of the system was analyzed in detail. Static and dynamic experimental data were obtained. The results show that measurement error of the system is less than 0.5 and the measurement resolution of heterodyne interference can reach 0.088nm in theory which is more conductive to measure the microvibration signal.