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太赫兹波成像技术在生物医疗和安全检测等领域具有广阔的应用前景。针对新一代信息技术对便携式太赫兹波成像设备的需求,设计了基于CMOS太赫兹波探测器的成像系统。该系统包括一款CMOS太赫兹波探测器、片外模数转换器(ADC)、FPGA数字信号处理器、二位步进机、四个抛物面镜和太赫兹波辐射源等。CMOS太赫兹波探测器集成了片上贴片天线以及作为检波元件的NMOS晶体管,探测器由180 nm标准CMOS工艺制成。太赫兹波探测器的输出被片外模数转换器(ADC)采集并转换为数字信号,该数字信号被FPGA采集并传输到电脑上成像。所有上述元件均被装备在印刷线路板(PCB)上以减小系统体积。该系统实现了透射式太赫兹波扫描成像而无需斩波-锁相技术,并给出在860 GHz的太赫兹波照射下隐藏在信封内部金属的成像结果。
Terahertz wave imaging technology has broad application prospects in the fields of biomedicine and safety testing. Aiming at the demand of portable terahertz wave imaging equipment by a new generation of information technology, an imaging system based on the terahertz wave detector is designed. The system includes a CMOS terahertz wave detector, off-chip analog-to-digital converter (ADC), FPGA digital signal processor, two stepper, four parabolic and terahertz radiation sources. The CMOS terahertz wave probe integrates an on-chip patch antenna and an NMOS transistor as a detection element. The detector is made of a 180 nm standard CMOS process. The output of the terahertz wave detector is captured by an off-chip analog-to-digital converter (ADC) and converted to a digital signal that is captured by an FPGA and transmitted to a computer for imaging. All of the above components are equipped on a printed circuit board (PCB) to reduce the system volume. The system enables transmissive imaging of terahertz waves without the need for chopping-phase locking techniques and gives the imaging results of the metal hidden in the envelope when irradiated with a terahertz wave at 860 GHz.