Ultrafast three-dimensional imaging system based on phase-shifting method and hybrid dispersion laser scanning

In this paper, we proposed an ultrafast 3-D imaging system based on phase-shifting method and a hybrid dispersion scanning technique. The imaging system is capable of acquiring the 3-D shape of the object at an ultrafast scan rate. A theoretical model is built to describe the operation principle of the imaging system and to analyze the performance of the system. In the demonstration, the imaging system is designed with practical devices and components. The system has a scan rate of 25 MHz and a frame rate of 100 kHz. The field of view is 50 μm × 50 μm, and the number of pixels of one frame is 260 pixel × 1000 pixel. The reconstructed 3-D image has the peak signal-to-noise ratio (PSNR) of 30.11 dB. The performance of the imaging system is investigated by analyzing the influence of the input beam size and the resolution of the digitizer. The input collimated light with large beam size is preferred for high image quality. Moreover, the depth resolution can be improved by using high-resolution digital signal processing.