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Investigations into Optically Controlled Phase Contrast, Polarisation Switchable Narrow Band RF Detection Techniques.

机译：对光控相差，偏振可切换窄带RF检测技术的研究。

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This thesis describes an investigation into S-band microwave frequency phase-contrast imaging. Resolution is a critical issue so system enhancements such as optical remote connection and polarisation-dependant sensing have been implemented within an end-to-end sensing system. Initially, the feasibility of phase-contrast measurements was considered and the limits of phase and amplitude measurements established. A switching matrix was then designed and incorporated into a tri-antenna array to demonstrate triangulation-based location. Commercial, linearly-polarised antennas were then used to demonstrate basic object location. A comprehensive experimental investigation into optical transmission of phase sensitive data using Radio over Fibre (RoF) techniques is then described. Reflective technology and directly modulated Vertical Cavity Surface Emitting Lasers (VCSELs) are assessed for suitability as are Coarse Wavelength Division Multiplexed (CWDM) architectures. These are believed to be a novel contribution in the imaging context as are the techniques employed to enhance and extend the matching and performance of the optical devices. A directly modulated VCSEL based CWDM method was then used over the extended range of 1 km of standard single mode optical fibre. Subsequently, dual polarisation plane techniques were used to generate sequential, orthogonally-separated measurements, which required the development of a suitable antenna. The design, modelling, construction and deployment of a high cross-polar isolation, patch antenna is then described. An antenna with single symmetrical forward lobes (on both polarisation planes) and low back radiation pattern was devised so enabling sensing from a single coincident point. With the device integrated into the final measurement system the resulting “Polarisation Switched, Narrowband, RF Probe System Using a VCSEL Optical Feed” was used to demonstrate improved resolution of a phase contrast RF measurement system at an optically-remoted distance of 1km.
机译：本文描述了对S波段微波频率相衬成像的研究。分辨率是一个关键问题，因此在端到端传感系统中已实现了诸如光学远程连接和偏振相关传感之类的系统增强功能。最初，考虑了相位对比测量的可行性，并确定了相位和幅度测量的极限。然后设计一个开关矩阵，并将其合并到一个三天线阵列中，以演示基于三角测量的位置。然后，使用商用线性极化天线来演示基本的物体位置。然后描述了使用光纤无线电（RoF）技术对相敏数据进行光传输的综合实验研究。评估反射技术和直接调制的垂直腔表面发射激光器（VCSEL）的适用性，以及粗波分复用（CWDM）架构。这些被认为是在成像方面的新颖贡献，用于增强和扩展光学装置的匹配和性能的技术也是如此。然后，在1 km的标准单模光纤的扩展范围内使用了基于直接调制VCSEL的CWDM方法。随后，使用双极化平面技术生成顺序的正交分离的测量结果，这需要开发合适的天线。然后描述了高交叉极化隔离贴片天线的设计，建模，构造和部署。设计了具有单个对称前瓣（在两个极化平面上）和低后向辐射方向图的天线，从而可以从单个重合点进行传感。将设备集成到最终测量系统中后，所产生的“使用VCSEL光学馈源的极化转换，窄带，RF探针系统”被用于演示相距RF测量系统在1km的光学距离上的分辨率提高。

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    Quinlan TJ;

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  • 年度 2016
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