The invention relates to a
vibration detection method based on the
laser wavefront coding technique. In the prior art, the high-performance and non-destructive
telemetry of the vibration information cannot be realized. According to the technical scheme of the invention, the method is designed based on the phase-interference behavior and the
laser wavefront coding principle of a
laser astigmatism field, wherein the dynamic
wavefront polarization and the phase encoding are conducted. After the coding process, the
light beam of a
light field is separated into a feedback
reference beam and a forward
test beam. The
test beam is projected onto a to-be-detected vibration object. An information beam is formed in the part of the
light field that is provided with speckle spots by means of an out-of-focus imaging component. Through the overlapping and intersecting process of the information beam and the
reference beam, an interference field is formed. A
photoelectric sensor is arranged in an interference region, so that the
photoelectric conversion of the interference information is realized. A vibration analyzing unit is used for analyzing the vibration information of a detection region through
processing the above information. The method has the advantages of high sensitivity, high reliability, non-contact detection, non-destructive
telemetry, strong anti-interference capability, flexible frequency characteristics, large amount of information, easy
system construction, wide application range, easy function expansion, convenient integration, flexible construction and the like.