Absolute and Precise Terahertz-Wave Radar Based on an Amplitude-Modulated Resonant-Tunneling-Diode Oscillator
Absolute and Precise Terahertz-Wave Radar Based on an Amplitude-Modulated Resonant-Tunneling-Diode Oscillator
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DOI：
10.3390/photonics5040052
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发表时间：
2018-12-01
期刊：
影响因子：
2.4
通讯作者：
Asada, Masahiro
中科院分区：
文献类型：
--
作者：
Dobroiu, Adrian;Wakasugi, Ryotaka;Asada, Masahiro
介绍了一种太赫兹雷达的工作原理及其概念验证实验。该雷达基于522 GHz共振隧穿二极管振荡器，其太赫兹输出功率可以通过将调制信号叠加在其偏置电压上轻松地进行调制。通过使用一个调制频率并测量返回信号的时间延迟，可以相对测量传播距离；添加第二个调制频率消除了由调制正弦波的周期性引起的模糊性，并允许绝对距离测量。我们对这种测量方法进行了实验验证，得到了理论预测的亚毫米精度。
We present the principle of a terahertz-wave radar and its proof-of-concept experimental verification. The radar is based on a 522 GHz resonant-tunneling-diode oscillator, whose terahertz output power can be easily modulated by superimposing the modulation signal on its bias voltage. By using one modulation frequency and measuring the time delay of the returning signal, a relative measurement of the propagation distance is possible; adding a second modulation frequency removes the ambiguity stemming from the periodicity of the modulation sine wave and allows an absolute distance measurement. We verified this measurement method experimentally and obtained a submillimeter precision, as predicted by theory.