A Microwave-Induced Thermoacoustic Imaging System With Non-Contact Ultrasound Detection.
Journal
IEEE transactions on ultrasonics, ferroelectrics, and frequency control
ISSN: 1525-8955
Titre abrégé: IEEE Trans Ultrason Ferroelectr Freq Control
Pays: United States
ID NLM: 9882735
Informations de publication
Date de publication:
10 2019
10 2019
Historique:
pubmed:
30
6
2019
medline:
30
6
2019
entrez:
29
6
2019
Statut:
ppublish
Résumé
Portable and easy-to-use imaging systems are in high demand for medical, security screening, nondestructive testing, and sensing applications. We present a new microwave-induced thermoacoustic imaging system with non-contact, airborne ultrasound (US) detection. In this system, a 2.7 GHz microwave excitation causes differential heating at interfaces with dielectric contrast, and the resulting US signal via the thermoacoustic effect travels out of the sample to the detector in air at a standoff. The 65 dB interface loss due to the impedance mismatch at the air-sample boundary is overcome with high-sensitivity capacitive micromachined ultrasonic transducers with minimum detectable pressures (MDPs) as low as 278 μ Pa
Identifiants
pubmed: 31251184
doi: 10.1109/TUFFC.2019.2925592
doi:
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.
Langues
eng
Sous-ensembles de citation
IM