Study Of Incoherent On-axis Digital Holography Imaging System Based On Michelson Interferometer

Holography imaging technology can record amplitude and phase information of the object, which is widely used in many fields. Compared with traditional laser holography, Incoherent holography, using a white light source, has no serious coherent speckle noise and high stability requirements of the system, which expand the scope of application of the holography imaging technology. This paper mainly discusses the incoherent on-axis digital holography imaging system based on Michelson interferometer.This paper introduces the development of incoherent holography imaging technology and the basic principle of incoherent holography imaging system. Several typical incoherent holography imaging system is described, and we take the incoherent on-axis digital holography imaging system based on Michelson interferometer, as an example. And the calculation method of the point spread function, the principle of how to record a hologram, the method of how to eliminate conjugate image and zero-order term and the numerical reconstruction algorithm are discussed.We introduces the basic principles of the generalized phase-shifting digital holography interferometry(GPSI) and the method of calculation phase-shifting in incoherent on-axis digital holography imaging system. Three-step GPSI and four-step GPSI was applied in incoherent on-axis digital holography imaging system successfully.This paper builds an incoherent on-axis digital holography imaging system based on Michelson interferometer, and we did some experiments such as standard resolution board, ruler and so on. The experimental results show that the incoherent holography imaging system based on Michelson interferometer, which can record digital holograms rapidly. The three-step GPSI and four-step GPSI algorithm can eliminate conjugate image and zero-order term successfully, and a clear reconstruction is given in the computer. Our experimental results show when the rate of the lateral magnification is 1.6 times, the lateral resolution of the system is up to 45lp/mm. On this basis, we build an incoherent on-axis digital holography telescope imaging system based on Michelson interferometer, and some experimental results are given in chapter four.We use the reconstructed image contrast function as a judgment to learn the digital autofocus features and phase shift error correction algorithm. The experimental results show that the reconstructed image contrast function is appropriate for the low noise interference case and flat object. When faced with high noise or the 3D object, our function couldn’t make the right judgment.