Study on preprocessing technique of digital interferograms using DSP hardware

摘要

With the development of modern science and technology, online detecting technique with high speed and high precision has been used increasingly by researchers in engineering production field. As the most effective and exact apparatus used to detect optics system and optics component, interferometer is developing quickly and its miniaturization has become one of the hotspots at present. In this paper, a systemic study was conducted to process interferograms and to realize real-time online hardware, the study gives the miniaturization a solid basis. On the basis of interferograms characteristics analysis and image noise analysis, the study of interferograms processing algorithms real time based on DSP hardware is conducted. By the analysis of interferograms characteristics, study on interference stripes noise and consideration of images processing results and easily hardware realization, multi-algorithms to smooth interferograms are analyzed and compared. At the same time, the software system of smoothing interferograms is designed which is based on DSP hardware and the real-time algorithms hardware operation is realized. The processing algorithms of interferograms are effective and can be realized by hardware easily via large numbers of experiments. Meanwhile, the DSP hardware can be used to design and simulate diminutive interferometer.