Research on underwater remote sensing with laser ultrasound based on speech recognition control
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摘要: 为了减少激光致声对水下目标遥感的实时性和有效性的影响，分析了激光超声诱导与光声效应原理，采用语音识别技术实现字符化编码，探讨语音信息的基频编码和控制激光发射的码型结构。搭建了实验测试系统，利用波长为1.06μm的脉冲激光进行水下超声激励，通过对水下激光声信号采集处理，完成了实验室空中平台到水下目标的实时语音控制。结果表明，非特定人的语音指令识别与编码方法有效实现了可变基频的激光超声水下目标控制。该研究为激光声水下目标遥感应用提供了一种新的技术途径。Abstract: In order to decrease the effect of laser-induced ultrasound on real-time performance and effectiveness of underwater remote sensing, the theory of laser-induced ultrasound and photoacoustic effect was analyzed. Character encoding was achieved by speech recognition technology. Baseband encoding for speech and code structure of controlling laser emission were discussed. The system of experimental measurement was set up. Pulse laser of 1.06μm wavelength was used to induce underwater ultrasound. By collecting and processing underwater laser-induced sound signals, real-time voice control from air platform in laboratory to underwater target could be accomplished. The experimental results show that, recognition and encoding for speaker-independent voice commands can realize the control of underwater target induced by laser ultrasound with adjustable baseband frequency. The study provides a new approach for underwater remote sensing with laser-induced ultrasound.
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