W-band Vibrometer for Non-contact Thermoacoustic Imaging
Archita Hati, Craig W. Nelson
Non-contact thermoacoustic imaging (TAI) has several desirable characteristics for applications such as explosive detection in high-water content media. In this paper, we report a detection technique using mm-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 the 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 also does not require highly reflective surface of the target to detect the thermoacoustic vibrations.
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
and Nelson, C.
W-band Vibrometer for Non-contact Thermoacoustic Imaging, IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, [online], https://doi.org/10.1109/TUFFC.2019.2923909
(Accessed June 15, 2021)