Backward mode detection of laser-induced wide-band ultrasonic transients with optoacoustic transducer

Autor:	Elena V. Savateeva, Natalia B. Podymova, Alexander A. Karabutov, Alexander A. Oraevsky
Rok vydání:	2000
Předmět:	Photoacoustic effect Optical fiber Materials science business.industry Lithium niobate General Physics and Astronomy Laser Piezoelectricity law.invention chemistry.chemical_compound Transducer Optics chemistry law Temporal resolution Optoelectronics Ultrasonic sensor business
Zdroj:	Journal of Applied Physics. 87:2003-2014
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.372127
Popis:	Time-resolved piezoelectric detection of wide-band ultrasonic transients induced by laser pulses in absorbing medium was studied. An optoacoustic transducer was developed for measuring the profiles of ultrasonic transients propagating in backward direction out of the laser-irradiated medium. For this purpose, an optical fiber for delivery of laser pulses to the surface of absorbing medium and a wide-band lithium niobate acoustic transducer were incorporated in one compact system, optoacoustic front surface transducer (OAFST). The transducer possesses temporal resolution (rise time) of 3.5 ns, low effective thermal noise pressure (10 Pa), and high sensitivity of piezoelectric detection (10 μV/Pa) over the ultrasonic frequency range from 1 to 100 MHz. Nd:YAG laser pulses at 355 nm were employed to generate distribution of acoustic sources in water solutions of potassium chromate with various concentrations. A temporal course of ultrasonic transients launched into an optically and acoustically transparent me...
Databáze:	OpenAIRE
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