title: Full-field mapping of ultrasonic field by light-source-synchronized projection.
abstract: A simple method for imaging ultrasonic fields in clear media is introduced. A modulated laser source is used to project the ultrasonic field onto a CCD camera. By use of the source-synchronized lock-in detection scheme, 2D images of the amplitude and phase distributions can be determined simultaneously. This technique is experimentally demonstrated with a 1-MHz and a 3.5-MHz ultrasonic transducer operated in continuous-wave mode. This method is very straightforward to implement and can be combined with the traditional tomographic reconstruction technique to obtain the 3D distribution of an ultrasonic field.
authors.forename: G
authors.initials: G
authors.lastname: Yao
authors.forename: L V
authors.initials: LV
authors.lastname: Wang
mesh_terms: D006801:Humans; D008027:Light; D014465:Ultrasonics