Reconstructing two-dimensional acoustic object fields by use of digital phase conjugation of scanning laser vibrometry recordings.
A scanning laser Doppler vibrometer is used to record two-dimensional ultrasound fields in air. The laser light of the vibrometer traverses the sound field to and from a rigid reflector and determines the velocity field, a quantity proportional to the sound pressure rate, in each scanned point relative to the sound source. The object sound is the scattered field from objects outside the recording area. Digital reconstruction by use of phase conjugation (time reversal) of the object sound field is then performed, and the original object field intensity and phase is reconstructed.
Zipser
Lothar
L
Hochschule für Technik und Wirtschaft, University of Applied Sciences, Friedrich-List-Platz 1, D-01069 Dresden, Germany.
Franke
Heinz
H
Olsson
Erik
E
Molin
Nils-Erik
NE
Sjödahl
Mikael
M