Multi-wavelength correlated imaging system based on digital micromirror device

Abstract

The invention discloses a multi-wavelength correlated imaging system based on a digital micromirror device, and the system comprises a laser, the digital micromirror device, a transmitting optical system, a receiving optical system, a dispersing prism, a linear array detector, and a computer. The laser outputs a UWB (ultra wide band) laser pulse to the digital micromirror device. The digital micromirror device receives a modulation signal outputted by the computer, modules the UWB laser pulse, and converts the UWB laser pulse into a pseudo thermal optical pulse. The transmitting optical systemcarries out the beam expanding and shaping of the pseudo thermal optical pulse, and then the pseudo thermal optical pulse is transmitted to a target object. A target echo signal is gathered and downsampled by the receiving optical system, and then is dispersed by the dispersing prism, and finally is transmitted to the linear array detector to be converted into an electric signal. The digital micromirror device is used for modulating the UWB narrow laser pulse to generate a pseudo thermal optical effect, thereby achieving the correlated imaging. The system can obtain the spectrum image information and distance information of the target object through the linear array detector.

Description

technical field [0001] The invention relates to the field of photoelectric imaging, in particular to a multi-wavelength correlation imaging system based on a digital micromirror device. Background technique [0002] The correlation imaging system involved in the present invention is a novel system imaging system that uses quantum entanglement light source, thermal light source or pseudo-thermal light source to irradiate the target to obtain the spatial distribution information of the target. The system uses a quantum entangled light source, thermal light source or pseudothermal light source to generate a beam with time-space correlation characteristics. to the target; the reflected optical signal of the target converges on the point detector through the receiving optical system; the electrical signal output by the point detector and the light field distribution information obtained by the area array detector are coincidentally measured, and the target image can be obtained. ...

AI Technical Summary

Problems solved by technology

[0003] The current correlative imaging system has the following problems: the quantum entanglement light source or thermal light source is not high in efficiency and low in brightness, and it is difficult to adapt to the long-distance imaging application environment; the acquisition of target information is single, which is not conducive to target recognition; the image reconstruction algorithm based on coincidence measurement The calculation speed is slow and the reconstruction quality is poor. Compared with the traditional imaging system in the conventional imaging scene, the advantages are not obvious, which limits the practical application of the correlation imaging system.

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