Experiment research of acoustic effect induced by pulsed CO2 laser in water
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1.
National Laboratory of Laser Technology, Huazhang University of Science and Technology, Wuhan 430074, China;
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2.
School of Science, Wuhan University of Science and Technology, Wuhan 430070, China
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Corresponding author:
CHENG Zu-hai, chengzuhai@mail.hust.edu.cn
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Received Date:
2005-11-29
Accepted Date:
2006-02-21
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Abstract
In order to get the characteristics of laser ultrasound in water,a spherical ceramic hydrophone and a digital oscilloscope were used to receive,demonstrate and store the optoacoustic signal induced by a TEA CO2 pulsed laser.Later the digital signal was analyzed and handled with a computational software.The experimental results showed that:the amplitude of the signal increased with the laser pulse energy and the signal had frequency peaks at 31kHz and 62kHz below 100kHz.Furthermore the peak frequencies decreased when the laser pulse width increased.The above results mean that applicable laser ultrasound source with higher amplitude and lower frequency,which can be used in underwater communication and underwater detection,can be chosen and acquired by adjusting the energy and width of laser pulse.
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References
|
[1]
|
SHAN Q,DEWHURST R J.Surface breaking fatigue crack detections using laser ultrasound[J].A P L,1993,62(21):2649～2651. |
|
[2]
|
HUANG J,NAGATA Y,KRISHNASWAMY S et al.Laser based ultrasonics for flaw detection[A].IEEE 1994 Ultrasonics Symposium Proceedings[C].New York:IEEE,1994.1205～1209. |
|
[3]
|
DEATON J B,MCKIE A D W,SPICER J B et al.Generation of narrow band ultrasound with a long cavity mode locked Nd:YAG laser[J].A P L,1990,56 (24):2390～2392. |
|
[4]
|
WANGNER J W,DEATON J B,SPICER J B.Generation of ultrasound by repetitively Q-switching pulsed Nd:YAG laser[J].Appl Opt,1988,27(22):4696～4700. |
|
[5]
|
SERGEY V E.Optoacoustics of oceans[M].Bellingham:SPIE Optical Engineering Press,1997.379～414. |
|
[6]
|
QIAN M L,ZHANG W Ch,WU T Ch.Study of characteristics of ultrasound pulse thermoelastically generated by a laser pulse[J].Acta Acustica,1995,20(1):1～10(in Chinese). |
|
[7]
|
MENG Zh T.The study of theory of ultrasound pulse waveform produced by laser pulse[J].Bulletin of Science and Technology,2001,17(5):38～42(in Chinese). |
|
[8]
|
ZHOU B K.Principles of laser[M].4th ed,Beijing:National Defence Industry Press,2000.132～136(in Chinese). |
|
[9]
|
HICKMAN G D,EDMONDS J A.Laser-acoustic measurements for remotely determining bathymetry in shallow turbid waters[J].Journal of the Acoustical Society of America,1983,73 (3):840～843. |
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