Ms. Lihua Lei Profile

Lihua Lei

at Qianxuesen lab

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Proceedings Article | 1 November 2016 Paper

Research on the characteristic of acoustic signal induced by thermoelastic mechanism

Ju Zhou, Li Hua Lei, Jian Jun Zhang, Ming Xue

Proceedings Volume 10157, 101572C (2016) https://doi.org/10.1117/12.2246828

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When a laser irradiates into the liquid medium, the medium absorbs the laser energy and induces sound source. As a new method to generate underwater sound wave, laser-acoustic has a variety of commercial and oceanographic applications on the information transmission between aerial and underwater platform, underwater target detection, marine environment measurement etc. due to its merits such as high acoustic intensity, spike pulse and wide frequency spectrum. According to different energy intensity of the laser pulse and the spatial and temporal distribution of energy interaction region, the mechanism of the laser interacting with water that generating sound are classified as thermoelastic, vaporization and optical breakdown mainly. Thermoelastic is an important mechanism of laser-acoustics. The characteristics of photoacoustic signal that induced by thermoelastic mechanism was summarized and analyzed comprehensively. According to different induce conditions, theoretical models of the photoacoustic signal induced by a δ pulse and a long pulse laser are summarized respectively, and its nature characteristic in the time domain and frequency domain were analyzed. Through simulation, the theoretical curve of the sound directivity was drawn. These studies will provide a reference for the practical application of laser-acoustics technology.

Proceedings Article | 25 October 2016 Paper

Research on laser induced acoustic source based underwater communication system

Lihua Lei, Ju Zhou, Lei Zhang, Xiaoyun Wan

Proceedings Volume 10157, 1015720 (2016) https://doi.org/10.1117/12.2246733

KEYWORDS: Acoustics, Telecommunications, Transducers, Laser energy, Laser optics, Optical communications

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Acoustic transducers are traditionally used to generate underwater acoustical energy with the device physically immersed in water. Novel methods are required for communicating from an in-air platform or surface vessel to a submerged vessel. One possible noncontact downlink communication system involves the use of laser induced acoustic source. The most common mechanisms of opto-acoustic energy conversion are, by order of increasing laser energy density and efficiency, thermal expansion, surface evaporation and optical breakdown. The laser induced acoustic source inherently bears the obvious advantage of not requiring any physical transducer in the medium. At the same time, acoustic energy propagation is efficient in water, whereas optical energy propagate well in air, leading to a more efficiency opto-acoustic communication method. In this paper, an opto-acoustic underwater Communication system is described, aiming to study and analysis whether laser induced sound could achieve good performance for effective communication in practical application.

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