为满足某些国家工程的发展需要, 比如说航天领域内, 液态燃料液位监测作为飞行指标考核的一个关键参数, 检测精度直接影响到各类飞行器的指标实现效率。基于塑料光纤弯曲损耗和受抑全内反原理, 设计了一种可实现单点离散与多点连续的液位传感系统。理论分析后, 使用实际器材验证理论分析, 阐述了操作原则、系统结构和技术优势, 分析了进行液位测量的可行性。根据理论分析的结果, 基于已有器材搭建了离散和连续式液位传感系统, 同时设计了一套实验装置并利用该装置对传感系统进行了验证实验。实验结果表明: 所提出的新型液位传感系统不仅可以实现液位的测量, 而且具有较好的测量一致性和易实现性。其中连续液位测量系统达到了测试量程450 mm, 测试灵敏度为0.808 3 μW/mm的液位测量。对工程应用领域的具有较好的参考意义。

In order to meet the growing requirements of some national projects, such as the aerospace, monitoring of fuel liquid level, as a key parameter of the flight evaluation, directly affects the efficiency of all kinds of crafts. A liquid level sensor system, which can achieve both single-point discrete and multi-point continuous measurement, was designed based on the bending loss of the plastic optical fiber and the total internal reflection principle. After description of the theory, the actual equipment was used to test the theoretical analysis, illustrate the operating principle, systematical composition and the advantages of the technology were inustrated, simultaneously the feasibility of liquid level measuring experiments in theory was analyzed. Furthermore, both discrete and continuous liquid level sensing systems were finished. The verifying experimental system was also set up. The experimental results show the proposed liquid level sensor system not only can realize the measurement of the liquid level, but also has good consistency and simple implementation. The continuous liquid level sensing system can reach the test range of 450 mm with a sensitivity of 0.808 3 ?滋W/mm, showing a significant reference for the engineering application.