| Ghost imaging, with a high advantage on interference and other aspects, is one of the hot spots and cutting-edge research in recent years in the field of quantum optics. Ghost imaging modalities available in free space can get farther, clarity higher detection images than conventional imaging. Aqueous medium with a strong scattering of light propagation and rapid absorption power make the underwater imaging more difficult.Based on the existing free-space ghost imaging system that combines water absorption and scattering of light, reflective underwater ghost imaging reconstruction formula, visibility and signal to noise ratio has been derived. We establish a pseudo thermal light source model, simulate free space and underwater optical light path, analog single-photon detector and point array detector to obtain signal and reference beams respectively, calculated by correlating the results of numerical simulation of the image, and analyzes the factors that affect the SNR.Using digital micromirror device spatial light modulator modulating 532 nm laser as a light source and PMT detector build an experimental device for underwater target object imaging experiments conducted at different times on the same association target detection by calculating the associated image acquisition experimental results with simulation results to verify the impact factor of the role of the SNR, analyze the reasons of SNR differences in free space and underwater environmental. Second-order reflective underwater ghost imaging has been extended to high-order, analogy to give the expression visibility and SNR. Second-order correlation results were reprocessed been associated with high-order reflective underwater ghost imaging experiments, the influence of order on relevance and visibility of the SNR. In this paper experiments validate the feasibility of pseudo thermal light associated imaging modalities for the detection of underwater target. |
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