The active imaging system has shown great potential in harsh environmental conditions, but the imaging quality of the system under certain conditions is difficult to be assessed. Therefore, we performed accurate physical modeling and imaging simulations of the active imaging system. In this paper, we analyze the signal transmission and degradation mechanism of active imaging by considering the global radiation and scattering elements of the imaging profile. Then, a full-chain imaging pixel equation is established to characterize the information conversion process, and global radiation elements such as backscattering, ambient radiation, and atmospheric turbulence are coupled into the imaging conversion model for higher accuracy. Furthermore, various design parameters and environmental parameters are coupled with the imaging model and a 3D digital prototype of the active laser imaging system is completed. The degradation of imaging contrast and range caused by visibility, atmospheric turbulence, aerosol type, and solar zenith angle is quantitatively evaluated. This research can provide useful support for the simulation analysis and performance prediction of active imaging systems.
The macroscopic property of optical material depends on the chemical composition as well as its mesoscopic structure. Thus, the processing of micro- and nanostructures of soft matter, including liquid crystal, is of great importance and can be exploited in many areas. The laser-assisted mechanical injection brings the concept of laser micro-nano manufacturing to the field of liquid crystal (LC) and injects a certain number of microdroplets (MDs) of the water solution with a uniform size into a host LC drop by using a laser beam. With the help of the elasticity of the LC medium, the injected water MDs spontaneously self-assemble into colloidal crystals as inner structures within the closed 3D space of the host LC drop in the microscale. The self-assembly structure of injected MDs in 3D has been scanned using the confocal microscope. In addition, by introducing the cholesteric LC drops with a topological defect line as the host, the injected MDs are captured by the defect line and self-assembled along its geometry into a chain. Moreover, it is proved that laser-assisted mechanical injection is also available for the interface of two immiscible fluids with a relatively high viscosity. The results provide a new method for fabricating and developing customized hierarchical microemulsion, drug delivery system, biosensor, and functionalized microstructure of soft matter.
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