W -Band Vibrometer for Noncontact Thermoacoustic Imaging

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 displacem...

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Bibliographic Details
Published in:IEEE transactions on ultrasonics, ferroelectrics, and frequency control ferroelectrics, and frequency control, 2019-09, Vol.66 (9), p.1536-1539
Main Authors: Hati, Archita, Nelson, Craig W.
Format: Article
Language:English
Subjects:
<italic xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">W -band
Displacement measurement
Imaging
Mixers
Optical surface waves
Phase noise
Sensitivity
thermoacoustic imaging (TAI)
vibrometer
Vibrometers
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Summary: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.
ISSN:0885-3010
1525-8955
DOI:10.1109/TUFFC.2019.2923909