Generally,a confocal Fabry-Perot interferometer is only able to detect the out-of-plane component of a displhacement field;while the in-plane component often has the information about the material which cannot be found in this out-of-plane component.In this paper,based on a confocal Fabry-Perot interferometer set-up for detecting the out-of-plane component of a laser generated acoustic field.,a technique is developed to detect both the out-of-plane and inplane displacement components simultaneously with a novel two-channel confocal Fabry-perot interferometer.
PAN Yongdong QIAN Menglu(Institute of Acoustics, Tongji University Shanghai 200092)
