Fiber array coupling based multi-spectral streak tube detection imaging method.

Abstract

The complementary advantages of the multi-spectral technique and streak tube detection imaging technique can enrich target information with high detection accuracy. In this paper, a new multi-spectral streak tube imaging method is proposed. Instead of using a set of receiving systems for each wavelength, i.e., the traditional method, we use different lengths of fiber arrays in our imaging system to produce the time difference between the echo signals of different wavelengths arriving at the detectors. The imaging process is completed by just one set of the receiving system. The contradiction between multiple wavelength information sub-area processing and large depth of field is alleviated, and the high time resolution is ensured. The mathematical model of this simplified system is established, and two simulation experiments are organized. First, the influence of the time difference on the judgment of echo signals is discussed. Second, we simulate the process of detecting and imaging a target using the traditional multi-spectral streak tube detection method and the proposed method. Finally, we compare the three-dimensional images obtained via the two methods. By observation and calculation, we find that the imaging depth of field and time resolution of the proposed method are better than those of the traditional method.