Ms. Sichen Zhang Profile

Sichen Zhang

at Beijing Institute of Technology

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Proceedings Article | 28 February 2021 Paper

Research on high-speed transmission and display technology of optical dynamic scene

Jitian Li, Xin Wang, Zhuo Li, Chang Xu, Sichen Zhang

Proceedings Volume 11781, 117811M (2021) https://doi.org/10.1117/12.2591370

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The optical scene generator is used to generate the optical characteristics of real scenes and is an important means to test the optical imaging system. With the continuous improvement of the performance of optical imaging system, optical scene generator needs to generate optical scene with high frame rate and high resolution, which puts forward higher requirements for the transmission and display rate of scene. In order to meet the requirement of performance test, this paper proposes a transmission and display link of high-speed data transmission and dynamic scene display through digital micromirror device (DMD) based on Windows operating system platform. In terms of data transmission, the relationship between the scene resolution ratio and memory buffer is analyzed. By adjusting the size of send and receive buffer and window, the data transmission rate is increased by 32.82 times. Combined with multithreading technology, the transmission rate of 10 Gigabit network is stabilized at 8.8Gbps. In data receiving, length counting method is used to avoid the problems of packet sticking and packet splitting in TCP/IP. On the DMD display side, the total display rate was doubled by using USB3.0 port transmission, ping-pong buffer technology and binary pulse-width modulation technology. The experimental results show that the whole link transmission rate of the high-speed transmission and display system proposed in this paper reaches 395.5MB/s. It can realize the transmission and display of 8-bit gray scene with frame rate of 200Hz, resolution of 1920 × 1080.

Proceedings Article | 12 March 2020 Paper

Wavelength framing technique based on a diffractive optical element

Qifeng Li, Zhuo Li, Lang Zhou, Sichen Zhang, Yanjin Li, Xin Wang, Rui Shi

Proceedings Volume 11434, 114340E (2020) https://doi.org/10.1117/12.2542475

KEYWORDS: Diffractive optical elements, Imaging systems, Cameras, Diffraction, Ultrafast phenomena, Bandpass filters

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Framing camera is a powerful tool to investigate the ultrafast phenomena in chemical reaction process. Wavelength framing technique is one of the key technologies in the development of framing cameras. The wavelength resolution of the images generated by wavelength framing system determines the interval time of the wavelength framing camera, that is, the time resolution of the wavelength framing camera. In this paper, a wavelength framing system based on a diffractive optical element (DOE) and a band-pass filter (BPF) was set up. The wavelength characteristics of the wavelength framing system were simulated utilizing the theory of multi-beam interference. The central wavelength of each image got from the system, which varies with the position relationship between DOE and BPF, has been obtained. Experiments were carried out through imaging a target of 6 mm × 6 mm by using the wavelength framing system. The spectral characteristics of each image were also studied experimentally. The result we have got proves that the system we have generated can achieve 16-frame imaging, every image has different spectral properties. For the target with a size of 6 mm × 6 mm, the resolution of a single image got from the system is 610 × 610, and the central wavelength ranges from 784 nm to 814 nm. The average difference in central wavelength between adjacent images is 1.95 nm. If the dispersion of the incident pulse light source is 0.46 ps/nm, the time resolution of the system is 0.9 ps.

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