Port storage tank safety accidents involve large-scale and multi-dimensional spatial problems, making it challenging to conduct traditional experimental research and simulation. This paper utilizes three-dimensional scene modeling and rendering for port storage tanks and their surrounding affected areas. The driving actions of each model structure are analyzed, and their corresponding subordinate relationships are configured. Numerical calculations are used to simulate the three-dimensional dynamic evolution process of safety accidents in the storage tanks. Additionally, a combination of spatial floating naked-eye enhanced stereoscopic display and real-time human-machine interactive technology is proposed. The constructed three-dimensional simulation scene is directly projected in the air, allowing for the intuitive representation of the processes of leakage, dispersion, ignition, propagation, and destruction of port storage tanks. This approach enables immersive and interactive stereoscopic perception, facilitating comprehensive understanding. It also provides technical support for the analysis of port storage tank safety accidents, guiding emergency response, and conducting emergency drills.
In the field of optical fiber distributed acoustic sensing, the combination of pulse compression and frequency division multiplexing will occupy a large bandwidth. In this paper, a novel distributed optical fiber acoustic sensor system is proposed, which can reduce the spectrum resources occupied by the combination of the above two technologies. The system continuously injects nonlinear frequency modulation detection pulses of different frequency ranges. The frequency response range of vibration is improved by frequency division multiplexing, and the spatial resolution is enhanced by nonlinear frequency modulation. Nonlinear frequency modulation also improves the sidelobe rejection ratio without loss of signal-to-noise ratio. In the experiment, eight frequencies were multiplexed using a 120MHz bandwidth. We achieved a spatial resolution of about 5m and a frequency response range of 1~20kHz on a 16.3km fiber.
The large-size naked-eye three-dimensional display can provide stunning visual impact effect for multiple people at the same time, which has always been the hot research spot for scientists. In addition, the corresponding real-time encoding algorithm for large-size three-dimensional image reconstruction is also a pressing problem. Here, a spliced high resolution three-dimensional display system composed of four LCD panels and a large size slit grating is demonstrated. The viewing area of each screen is adjusted individually by the method of black and white viewpoint adjustment. Moreover, the image coding algorithm based on depth offset mapping adjusts the offset of different view areas to spliced reconstructed display image and performs four screen synchronous display through the driving device. In the experiment, the spliced high-resolution 3D real-time rendering display system is realized.
The lenticular grating is the most widely adopted core light control device in the naked-eye autostereoscopic display technology, which has a certain inclination angle with the subpixels on the liquid crystal display to eliminate the moirefringes. However, the segmentation of the sub-pixels by the edge of the lenticular lens unit will inevitably lead to the sawtooth of the displayed three-dimensional image. Therefore, a weighted optimization algorithm for synthetic images is proposed in this paper, which is based on the sub-pixel segmentation area and adjacent pixel values for correction. In the experiment, the sawtooth of the reconstructed image is suppressed and the display quality is improved.
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