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W -Band Vibrometer for Noncontact Thermoacoustic Imaging



Archita Hati, Craig Nelson


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.
Proceedings Title
Proceedings of the 2019 IEEE IFCS-EFTF
Conference Dates
April 14-18, 0019
Conference Location
Orlando, FL, US
Conference Title


Phase noise, Thermoacoustic Imaging, Vibrometer, W-band


Hati, A. and Nelson, C. (2019), W -Band Vibrometer for Noncontact Thermoacoustic Imaging, Proceedings of the 2019 IEEE IFCS-EFTF, Orlando, FL, US, [online], (Accessed April 17, 2024)
Created June 20, 2019, Updated March 25, 2024