@article{oai:air.repo.nii.ac.jp:00003133,
 author = {IMANO, Kazuhiko},
 issue = {6},
 journal = {日本画像学会誌, Journal of the Imaging Society of Japan},
 month = {},
 note = {A refined imaging method is proposed that can detect the surface vibration velocity of a sample placed on a vibrating piezoelectric transducer surface in air. The piezoelectric ultrasonic transducer is excited using a Barker-coded voltage signal under a constant-voltage drive to obtain a vibration velocity with the same waveform as a coded ultrasonic signal in the time domain. The coded vibration velocity is detected using a laser Doppler vibrometer and is used to image the object placed on the transducer via cross-correlation. A silicone rubber sheet containing the characters "U" and "S" are imaged under low S/N conditions to confirm the performance of the method. Ultrasonic velocity in sample can also be measured with this system.},
 pages = {476--479},
 title = {Barker-coded Ultrasonic Imaging using Optical Surface Vibration Measurement},
 volume = {53},
 year = {2014}
}