Study On Wavefront Measurement Technology Based On Radialshearing Interferometer

The technology of wavefront measurement apply to all kinds of field.It plays an irreplaceable role in the development of science and technology.Compare with traditional wavefront measurement technology,such as Twyman-Green interferometry,radial shearing interferometer(RSI) needn't setting special reference beam of light,so large-diameter wavefront can be measured.Furthermore,it is not sensitive to the vibration and the disturbance of the air.And it is suitable to be used on the spot.But the reference beam in RSI system is usually not ideal plane-wave, the wavefront under measuring can not be directly reflected on the interference figure.Then the algorithm of reconstructing wavefront and the interpretation of interference figure become complicate and difficult.In the dissertation,several classic RSIs are analyzed and discussed, established a wavefront measurement system which based on the cyclic radial shearing interferometer.Main contents in the dissertation have been summarized as fellows:1 Based on the principle of radial shearing interference, radial shearing interference fringes was simulated.2 The principle of choosing radial shearing ratio has been presented based on the relative sensitivity and RSI's fringes.3 Based on the radial shearing wavefront character , an algorithm and reconstruction procedure are proposed,the algorithm is based on the least squares principle and the Zernike polynomial.Simple and complex wavefront were simulated,and relativity accuracy was used to indicate error.4 Defects in optical components can generate the interference fringes fracture,to solve that problem ,morphology was used to process the interference fringes.5 Telescope system and beam splitter was design,the relationship with transmission and reflectivity and radial shearing ratio was proposed.6 Radial shearing interferometer wavefront meaurement system was designed and constructed.Simulation was completed and the conclusion shows that the research on wavefront reconstruction algorithm has been fundamentally fulfilled.