Frequency dependence of laser ultrasonic SAW phase velocities measurements. / Li, Chunhui; Song, Shaozhen; Guan, Guangying; Wang, Ruikang K; Huang, Zhihong.
In: Ultrasonics, Vol. 53, No. 1, 01.2013, p. 191-195.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Frequency dependence of laser ultrasonic SAW phase velocities measurements
A1 - Li,Chunhui
A1 - Song,Shaozhen
A1 - Guan,Guangying
A1 - Wang,Ruikang K
A1 - Huang,Zhihong
AU - Li,Chunhui
AU - Song,Shaozhen
AU - Guan,Guangying
AU - Wang,Ruikang K
AU - Huang,Zhihong
PY - 2013/1
Y1 - 2013/1
N2 - Advances in the field of laser ultrasonics have opened up new possibilities in applications in many areas. This paper verifies the relationship between phase velocities of different materials, including hard solid and soft solid, and the frequency range of SAW signal. We propose a novel approach that utilizes a low coherence interferometer to detect the laser-induced surface acoustic waves (SAWs). A Nd:YAG focused laser line-source is applied to steel, iron, plastic plates and a 3.5% agar-agar phantom. The generated SAW signals are detected by a time domain low coherence interferometry system. SAW phase velocity dispersion curves were calculated, from which the elasticity of the specimens was evaluated. The relationship between frequency content and phase velocities was analyzed. We show that the experimental results agreed well with those of the theoretical expectations.
AB - Advances in the field of laser ultrasonics have opened up new possibilities in applications in many areas. This paper verifies the relationship between phase velocities of different materials, including hard solid and soft solid, and the frequency range of SAW signal. We propose a novel approach that utilizes a low coherence interferometer to detect the laser-induced surface acoustic waves (SAWs). A Nd:YAG focused laser line-source is applied to steel, iron, plastic plates and a 3.5% agar-agar phantom. The generated SAW signals are detected by a time domain low coherence interferometry system. SAW phase velocity dispersion curves were calculated, from which the elasticity of the specimens was evaluated. The relationship between frequency content and phase velocities was analyzed. We show that the experimental results agreed well with those of the theoretical expectations.
KW - Surface acoustic wave (SAW)
KW - Frequency content
KW - Laser ultrasonics
KW - GENERATION
KW - ELASTIC PROPERTIES
KW - LINE SOURCE
KW - WAVES
KW - CONSTANTS
KW - Phase velocity
KW - Young's modulus
UR - http://www.scopus.com/inward/record.url?partnerID=yv4JPVwI&eid=2-s2.0-84869118392&md5=dad6f66028894ba62e1d542541950f99
U2 - 10.1016/j.ultras.2012.05.009
DO - 10.1016/j.ultras.2012.05.009
M1 - Article
JO - Ultrasonics
JF - Ultrasonics
IS - 1
VL - 53
SP - 191
EP - 195
ER -