Experimental study of target detection based on vibration and polarization characteristics

A new method of detecting target is presented based on vibration and polarization and a series of experiments have been done. The frequency difference is modulated by vibration displacement signal. A computer is used to adopt and analyze the vibration signal. The method has a good potential prospective to be applied in high resolution, low and middle frequency vibration measurement or random vibration measurement. Vibration imagery offers new possibilities for target classification, and for investigating and monitoring vibration behavior of large scale structures. Experimental and theoretical comparisons of laser detecting techniques with and without spatial resolution capability will be presented. The polarizing characteristics of laser reflected from targets are studied, and some physical parameters of the laser are given, such as backward reflection energy and polarization degree. In order to discriminate the original polarization radiation and non-polarization radiation, the emission system of laser and the detection system of both vertical polarization and parallel polarization are discussed. Analysis of the measured relative polarization and reflectance consists of single wavelength and multi-wavelength comparisons with man-made and background items. A direct comparison is made between natural and man-made materials and different wavelengths of light.