$W$ -Band Vibrometer for Noncontact Thermoacoustic Imaging | Zendy

Archita Hati | Zendy; Craig W. Nelson | Zendy

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$W$ -Band Vibrometer for Noncontact Thermoacoustic Imaging

Author(s) -

Archita Hati,

Craig W. Nelson

Publication year - 2019

Publication title -

ieee transactions on ultrasonics ferroelectrics and frequency control

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.159

H-Index - 136

eISSN - 1525-8955

pISSN - 0885-3010

DOI - 10.1109/tuffc.2019.2923909

Subject(s) - laser doppler vibrometer , acoustics , interferometry , sensitivity (control systems) , optics , materials science , laser scanning vibrometry , displacement (psychology) , vibration , laser , frequency band , physics , bandwidth (computing) , electronic engineering , laser beams , engineering , telecommunications , psychology , psychotherapist

Noncontact thermoacoustic imaging (TAI) has several desirable characteristics for applications such as explosive detection in high-water-content media. In this letter, we report a detection technique using millimeter-wave interferometry based on sensitive phase detection at W -band. The displacement sensitivity of the proposed W -band vibrometer at 95 GHz is of the order of 1 nm. We also analyze the effect of phase noise on the sensitivity of the vibrometer. Unlike laser-based sensors, a W -band sensor has several advantages; it can easily penetrate surface obscurants such as fur or cloth and it does not require a highly reflective surface of the target to detect the thermoacoustic vibrations.

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