Absolute and Precise Terahertz-Wave Radar Based on an Amplitude-Modulated Resonant-Tunneling-Diode Oscillator

Photonics

卷:5

Adrian Dobroiu¹  Ryotaka Wakasugi¹  Safumi Suzuki¹  Masahiro Asada¹  Yusuke Shirakawa¹ 

[1] Tokyo Institute of Technology, Meguro, Tokyo 152-8552, Japan;

关键词: terahertz-wave radar;    resonant-tunneling diode;    amplitude-modulated continuous-wave radar;   

DOI  :  10.3390/photonics5040052

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown