Automatic zero calibration with ambient air on every start of the system, optical and acousticalsignal after finishing of calibration.
开启系统时，仪器会自动进行零校准。校准完毕后会出现光学和声学信号。
2
The possibility density technology was used to entrap a little change of acousticalsignal, which can discern the gas incursion and give the alarm efficaciously.
利用概率密度技术捕捉声信号的微小变化，能够有效地识别气侵并报警。
3
The question of passive localization of the underwater sources using matched-field processing is one of the hot topics in the field of underwater acousticalsignal processing.