测量海底沉积物声学特性的多种波形声源开发与实验-机械工程专业毕业论文.docx

ABSTRACT
Acoustic properties of seafloor sediments is the underlying data of studying the Ocean acoustic field enviroment,is indispensable research contents in constructing geo acoustic model and provide the basic data and the key techno logy for seabed
classification and exploitation of marine resources,national defense and sound velocity and attenuation coefficient are two important parameters to reflect the sound physical properties and the internal structure of the seabed sediments can be distinguished by their time domain pulse wave
measurement method,usually requires manual interpretation of the first wave
information collected.
At present,the measurement of acoustic characteristics of seabed sediments is mainly based on the pulse wave transmission pulse wave measurement method,usually requires manual interpretation of the first wave of information to the uneven sediment media,large transmission sound attenuation,the acquisition of the acoustic wave signal waveform is not stable,to bring disturbance to
the manual on this situation,this paper introduces a new waveform
measurement method,and develops a waveform generator,to try a variety of time domain waveforna to measure the seafloor sediment
This paper introduces the present situation of the acoustic characteristics of the seabed sediments,including the measurement of the laboratory and in situ the measuring principle,on the basis of traditional pulse wave measuring method of analysis,innovatively put forward of seafloor sediments with continuous wave(sine wave,amplitude modulation wave)cross-correlation measuring sound velocity and autocorrelation measurement principle of acoustic attenuation,and gives the calculation the development of measurement device,sound source hardware part of the circuit board signal,the driving circuit board and isolated position;in terms of software,the