用于顯微成像的單根光纖共振型壓電掃描器
[Abstract]:In order to promote the more important role of scanning microscopic optical imaging in clinical medical application and biological research, this paper focuses on the key scientific and technological problems in the development of single fiber resonant piezoelectric scanner. The principle, method, technology and application of the scanner are discussed systematically. This paper breaks through the exploration and blindness in the development and manufacture of single fiber optic resonance piezoelectric scanner, studies the operating mechanism of the scanner, determines the determinant factors of the scanner's performance, and designs the scanner. Production and evaluation provide effective scientific guidance. The main research results obtained in this paper are as follows: 1) the effects of material parameters on the key deformation parameters and vibration parameters of the scanners are studied and the quantitative relationship between them is clarified. The displacement at the end of the piezoelectric square tube is proportional to the square of the length of the piezoelectric plate, proportional to the piezoelectric coefficient, proportional to the applied electric field, and negatively related to the width and thickness of the piezoelectric plate. The amplitude of the cantilever of the scanner is inversely proportional to the square of the diameter of the fiber, the length of the cantilever and the modulus of elasticity. 2) the coupled field numerical simulation model is used. The input and output response mechanism of the scanner system is studied. The first to fortieth modes of the scanner are obtained, and the vibration modes including chord vibration, cantilever vibration, square tube torsion, square tube vibration, and longitudinal scaling are determined. It is clear that the cantilever vibration can provide effective optical scanning. The steady-state response of the structure under sinusoidal excitation is obtained, and the response of the system caused by the excitation of the fourth-order resonant frequency of the 0-14kHz spectrum is obtained. The behavior of the scanner under the action of inertia, damping and other factors with time after-effect is analyzed. Fifty motion transients of spiral scanning and 60 motion transients of Lisaru scanning are obtained. 3) the design of scanner realizes individualized customization according to different requirements. For in vivo clinical endoscope application, a low voltage miniaturization scanner with a diameter of 2 mm and a driving voltage of 10 V peak is developed, and a grid scanner with high continuity and uniformity is developed for the application of in vitro scanning imaging. It has stable line scanning rate 879Hz and frame rate 3Hz. For nonlinear optical imaging applications, a scanning device with small nonlinear optical effect and high acquisition efficiency is developed. When the pulse width of 52mW power output is 175 fs and the diameter of the probe is 3.5mm after encapsulation, the probe is the first to drive 350 渭 m diameter optical fiber with a small size single fiber resonant piezoelectric scanner to obtain a larger vibration range than that of 1mm. In conclusion, the theoretical and experimental study of single fiber resonant piezoelectric scanner is carried out to meet the application requirement of micro optical imaging system. The key problems of the scanner operation mechanism are discussed, and a complete implementation scheme is proposed. The prototype system is obtained and the imaging application is realized. The work in this paper provides a basis for the application of a single fiber optic resonance piezoelectric scanner.
【學位授予單位】:華中科技大學
【學位級別】:博士
【學位授予年份】:2014
【分類號】:R318.6
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