Biblio

Filters: Author is Gong, Xun  [Clear All Filters]
2022-05-06
Fu, Shijian, Tong, Ling, Gong, Xun, Gao, Xinyi, Wang, Peicheng, Gao, Bo, Liu, Yukai, Zhang, Kun, Li, Hao, Zhou, Weilai et al..  2021.  Design of Intermediate Frequency Module of Microwave Radiometer Based on Polyphase Filter Bank. 2021 IEEE International Geoscience and Remote Sensing Symposium IGARSS. :7984–7987.
In this work, an IF(intermediate frequency) module of a hyperspectral microwave radiometer based on a polyphase filter bank (PFB) and Discrete Fourier Transformation (DFT)is introduced. The IF module is designed with an 800MSPS sampling-rate ADC and a Xilinx Virtex-7 FPGA. The module can achieve 512 channels and a bandwidth of 400M and process all the sampled data in real-time. The test results of this module are given and analyzed, such as linearity, accuracy, etc. It can be used in various applications of microwave remote sensing. The system has strong expandability.
2020-01-13
Wang, Xiao-yu, Li, Cong-cong, Wu, Hao-dong, Zhang, De, Zhang, Xiao-dong, Gong, Xun.  2019.  NDE Application of Air-Coupled Transducer for Surface Crack Detection. 2019 13th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA). :1–4.
According to the technical difficulties of the air-coupled piezoelectric ultrasonic transducer, 1-3 type piezoelectric composites and double matching layers structure are adopted in order to solve the acoustic impedance mismatch at the interface between the piezoelectric materials and air. The optimal design of the matching layer thickness for double matching layers structure air-coupled ultrasonic transducer is also completed through experiments. Based on this, 440 kHz flat-plate and focused air-coupled piezoelectric ultrasonic transducer are designed, fabricated and characterized. Finally, surface cracks are detected using the focused air-coupled piezoelectric ultrasonic transducer.