4 January 2019 Using the ultrasound for optical study of sea water
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Proceedings Volume 11024, Asia-Pacific Conference on Fundamental Problems of Opto- and Microelectronics 2017; 110240N (2019) https://doi.org/10.1117/12.2517687
Event: Asia-Pacific Conference on Fundamental Problems of Opto- and Microelectronics 2017, 2017, Taipei, Taiwan
Abstract
The method of laser induced breakdown spectroscopy (LIBS) was used to investigate intensive lines of sodium, calcium, potassium and magnesium in the aqueous solutions under the action of ultrasound at the frequencies of 10.7 kHz, 60 and 240 kHz. Acoustic radiation was generated within of cylinder transducers using a digital generator and powerful amplifier with maximum amplitude of 100 kPa. To excite optical breakdown in water we used a Nd:YAG laser with the wavelength of 532 and 1064nm. The changing of the delay of the control pulses allows to synchronize the time of maximum expansion of the liquid acoustic impulses and the start of the optical breakdown. The additional influence of ultrasonic radiation on the process of laser breakdown was studied. The increasing of the lines intensity under the influence of ultrasound is observed at all concentrations of the used solutions. It is shown that under the action of ultrasound on the dynamics of the cavity in a fluid the phase of the acoustic impact has a great significance. As a result it is shown that under the influence of ultrasound the strong strengthening of the intensity of spectral lines of elements dissolved in aqueous solutions is observed.
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Alexey V. Bulanov and Ivan G. Nagorny "Using the ultrasound for optical study of sea water", Proc. SPIE 11024, Asia-Pacific Conference on Fundamental Problems of Opto- and Microelectronics 2017, 110240N (4 January 2019); doi: 10.1117/12.2517687; https://doi.org/10.1117/12.2517687
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