Multifunction three-dimensional displacement and topography laser interferometry system

The invention discloses a multifunction three-dimensional displacement and topography laser interferometry system, belonging to the technical fields of photo mechanics, engineering material, structural member deformation, displacement testing, topography measurement and the like. The invention consists of a laser device, a image collecting and shooting system, a light split coupler, a light split photoswitch, a DC electrical source controller, a three-dimensional laser interference optical path system, a loading charging floor for putting test pieces, a bracket adjusting system, a computer and the like. The laser interferometry system can realize high-precision measurement of u, v and w displacement fields, and displacement measurement sensitivity can reach wavelength magnitude; the laser interferometry system has two displacement measurement modes of digital holography and electronic speckle pattern interferometry, and also has the mode of digital holographic measurement of surface topography. The invention can realize the adjustment of degrees of freedom on multiple directions by using the bracket adjusting system, brings convenience for system imaging and measurement adjustment, and has the characteristics of convenient use, compact structure, high measurement precision and the like; because the system is provided with a phase shifting device, the displacement measurement precision of the system of the invention can reach nanometer magnitude after phase shifting treatment.