title: Downstream Fabry-Perot interferometer for acoustic wave monitoring in photoacoustic tomography.
abstract: An optical detection setup consisting of a focused laser beam fed into a downstream Fabry-Perot interferometer (FPI) for demodulation of acoustically generated optical phase variations is investigated for its applicability in photoacoustic tomography. The device measures the time derivative of acoustic signals integrated along the beam. Compared to a setup where the detection beam is part of a Mach-Zehnder interferometer, the signal-to-noise ratio of the FPI is lower, but the image quality of the two devices is similar. Using the FPI in a photoacoustic tomograph allows scanning the probe beam around the imaging object without moving the latter.
authors.affiliation: Center for Non-Destructive Testing (RECENDT) GmbH, Linz, Austria. ro.nuster@uni‐graz.at
authors.forename: Robert
authors.initials: R
authors.lastname: Nuster
authors.forename: Hubert
authors.initials: H
authors.lastname: Gruen
authors.forename: Bernhard
authors.initials: B
authors.lastname: Reitinger
authors.forename: Peter
authors.initials: P
authors.lastname: Burgholzer
authors.forename: Sibylle
authors.initials: S
authors.lastname: Gratt
authors.forename: Klaus
authors.initials: K
authors.lastname: Passler
authors.forename: Guenther
authors.initials: G
authors.lastname: Paltauf
mesh_terms: D000162:Acoustics; D007368:Interferometry / Q000379:methods*; D008027:Light; D055620:Optical Phenomena; D011312:Pressure; D013997:Time Factors; D014054:Tomography / Q000379:methods*