TY - JOUR
T1 - Adaptive heterodyne photorefractive interferometer for ultrasound detection
T2 - Optimization & application
AU - Ing, R. K.
AU - Pouet, B. F.
AU - Krishnaswamy, Sridhar
AU - Royer, D.
PY - 1997/12/1
Y1 - 1997/12/1
N2 - The advantages of ultrasonic remote detection using a heterodyne photorefractive interferometer are demonstrated. The speckle nature of the light reflected by a rough surface (or after propagation through a multimode fiber) does not degrade the interferometer sensitivity. Thanks to the process of wave mixing in photorefractive crystals, this interferometer has a large etendue. Furthermore, the heterodyne detection provides an absolute measurement of the ultrasonic amplitudes. In this paper, we investigate the influence of an applied ac electric field. Two photorefractive crystals, undoped BSO and BSO:Cr, which have different optical characteristics are compared. Finally, examples of application to NDE are demonstrated.
AB - The advantages of ultrasonic remote detection using a heterodyne photorefractive interferometer are demonstrated. The speckle nature of the light reflected by a rough surface (or after propagation through a multimode fiber) does not degrade the interferometer sensitivity. Thanks to the process of wave mixing in photorefractive crystals, this interferometer has a large etendue. Furthermore, the heterodyne detection provides an absolute measurement of the ultrasonic amplitudes. In this paper, we investigate the influence of an applied ac electric field. Two photorefractive crystals, undoped BSO and BSO:Cr, which have different optical characteristics are compared. Finally, examples of application to NDE are demonstrated.
UR - https://www.scopus.com/pages/publications/0031347642
UR - https://www.scopus.com/inward/citedby.url?scp=0031347642&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0031347642
SN - 1051-0117
VL - 1
SP - 613
EP - 616
JO - Proceedings of the IEEE Ultrasonics Symposium
JF - Proceedings of the IEEE Ultrasonics Symposium
ER -