声学调查设备系统自噪声测量方法研究

Study on the Self Noise Measurement Methods for Acoustic Survey Devices

声学调查设备重要功能之一是用来获取海洋中的背景噪声信号,这些信号都是弱信号,因此系统自噪声是声学调查设备中一项重要性能指标。提出了3种声学调查设备系统自噪声测量的方法,其中短路噪声测量法是实验室应用较多的一种方法,试验结果表明采用短路噪声测量法测量系统自噪声的结果可验证声学调查设备自噪声性能是否满足设计指标。低噪声环境自噪声测量法可以作为设备整机的功能及性能测试。

One important function of acoustic survey devices is to obtain background noise signals in the ocean, which are all weak signals. Therefore, the self noise of a device is an essential parameter for acoustic survey. Three kinds of methods are presented for measuring the self noises of acoustic survey devices. Among them, the short circuit noise measurement method is frequently used in the laboratory. The experiments prove that the self noise results of a system from the short circuit noise measurement method can verify whether the self noise performance of the acoustic survey device can meet the design criteria. The self noise measurement method for low noise environment can be used for testing the function and performance of the whole system.