微小卫星液化推进剂气化过程可视化检测方法

微小卫星在科学研究、交通导航、自然灾害预报、城市规划、环境监测、国防安全等领域应用潜力巨大.然而，作为常用于微小卫星系统的液化气推进装置，其推进剂存在气化不完全问题，导致推进性能下降.为了有效控制气化过程，研究了基于电容层析成像(ECT)技术的液化推进剂气化过程可视化和气相含率检测方法.为了提高测量信噪比和降低加工难度，设计了一个6电极柔性PCB传感器.针对6电极成像质量较差问题，在线性反投影(LBP)和Tikhonov正则化的基础上，提出了像素插值法，建立了灰度值 相含率映射模型.仿真结果表明，应用像素插值后，重建图像平均相对误差降低了7.72%，图像质量显著提高，相含率测量误差显著减低(不大于4.86%).最后，基于微小卫星推进剂气化的实际情况设计了模拟实验装置，证明了所设计的柔性PCB传感器和所提出算法及映射模型的可行性.

Visual Detection Method for Gasification Process of Micro Satellite Liquefied Propellant

Micro satellites are widely used in scientific research, traffic navigation, natural disaster forecasting, urban planning, environmental monitoring, national defense security, etc. However, liquefied gas propulsion device, which is often used in micro satellite systems, has a problem that its propellant is not completely vaporized, resulting in a decrease in propulsion performance. To effectively control the gasification process, based on electrical capacitance tomography (ECT) technique, the visualization and void fraction detection method of the liquefied propellant gasification process are presented in this paper. A 6 electrode flexible PCB sensor is designed to improve the signal noise ratio of the measurement and reduce the difficulty in processing. Due to the poor image quality of the 6 electrode ECT system, a pixel interpolation method is proposed based on linear back projection (LBP) and Tikhonov regularization. The mapping model from gray value to void fraction is also established. Simulation results show that after applying pixel interpolation, the average relative error of the reconstructed image is reduced by 7.72%, and the image quality is significantly improved, with the void fraction measurement error significantly reduced (less than 4.86%). Finally, based on the actual situation of micro satellite propellant gasification, an experiment setup is established, which proves the feasibility of the proposed method.