The Study Of Single Fiber Piezoelectric Scanner And Its Vibration Characteristics

A single fiber scanner based on a piezoelectric ceramic tube is proposed and studied.Applying a phase-inverted voltage to a pair of electrodes of the piezoelectric ceramic causes the piezoelectric actuator to deflect axially,which drives the fiber in the center of the piezoelectric ceramic tube to scan with forming a projection illumination area on the surface of the object,then optical collector takes the light reflected from the surface of the object and converts it into electric signal which is restored by computer to a two-dimensional image,The single fiber scanner has a compact structure which is composed of an optical fiber,piezoelectric actuator tube(PZT-5A),insulation collar,and metal outer protective sleeve.The diameter can be controlled within 2.1mm.The material for each component is easily available and the process of scanner assembly is simple to operate.The structure of scanner is compact,especially the cost is lower,this endoscope can be widely used in medical detection,micro projection and narrow imaging.In this thesis,the development of endoscope in the world is introduced,the advantages and disadvantages of different endoscopy types are summarized and compared,this thesis also proposes a single fiber scanning endoscope based on the principle of optical fiber scanning,the endoscope is made of piezoelectric actuator tube(PZT-5A),optical fiber,insulating collar,outer protective metal sleeve,insulating glue composition.The paper analyzes the characteristics of piezoelectric ceramics,as well as the principle of optical fiber resonance scanning,then uses finite element analysis software to simulate the model of the endoscopic scanner,during the simulation,when the scanning probe changes with the length of the fiber cantilever and the structure of fiber cantilever,the scanning amplitude of the fiber cantilever end and the resonance frequency can be acquired.Except the selection of materials for each part,the auxiliary tools for the manufacture of the single fiber scanner are also shown,after making the scanner,the experimental data is compared with the simulation data.The stability of the single fiber scanner is also tested with the time changed,and the optical signal is successfully acquired to recover the 2D imaging.