The Amplifying Circuit And Synchronizer Designing In Self-contained Data Acquisition System

The field vector information acquisition of ocean ambient noise is an indispensablepart of Ocean Ambient Noise field research and other ocean acoustics research. Based onthe self-contained data acquisition system development, this paper mainly studies thesignal amplifying, filtering circuits and data acquisition synchronizer.Firstly, the paper introduces the background and significance of the study, anddevelopment stages of hydroacoustics pretreatment technology, particularly focusing on thedata acquisition system. Currently, submerged-buoy acquisition is one of the most importantcollection methods in ocean data acquisition system. It defines and describes thedevelopment process of submerged-buoy acquisition system, but multi-submerged-buoyacquisition has synchronization problems on time.Secondly, according to the technical target of self-contained data acquisition system,the paper designs signal amplifying and filtering circuits. The circuit uses Butterworth filter,choosing two kinds of operational amplifiers, designing several signal amplifying andfiltering circuits, which test the performance of the circuit, and then comparing self-noise ofthe circuits to determine the optimal solution.Finally, according to the requirements of self-contained data acquisition system, thepaper designs the data acquisition synchronizer. Data acquisition synchronizer adopts highaccuracy and oven controlled crystal as timing controller. Before beginning the dataacquisition, it conducts time synchronization for each set of acquisition system, ensuringthat the sound field information obtained by different acquisition systems are in the sametime. Meanwhile, synchronizer has self-test and time setting functions.This paper studies Butterworth filter and amplifying circuit, and testing them todetermine the optimal form of the signal amplifying and filtering circuits. The test resultsindicate that the circuit and synchronizer are fully compliant with the intended designrequirements.