大动态范围的环境噪声自动测量仪的研制

研制了一台动态范围为90dB以上的环境噪声自动监测及统计分析仪器。可以适用于声级起伏变化很大的环境噪声和交通噪声的全量程监测,并可以把测量结果和统计分析结果自动显示和打印出来,解决了随机性较强的环境噪声的自动监测问题。仪器內部有两只对数放大器,由于器件特性的限制,每只对数放大器的动态范围约60dB左右,但通过微处理器对双通道对数放大器的交替采样,并经过数据处理,实现了二对数放大器的测量动态范围的自动连接,这样扩大了量程(大于90dB)实现了仪器的全量程测试。

DESIGN OF AN AUTOMATIC NOJSE MEASURING INSTRUMENT WITH LARGE DYNAMIC RANGE

A new noise instrument, which can auto matically detect and statistically analyze ambient noise, is designed and established The dynamic range of this instrument is more than 90 dB so it is suitable for the whole dynamic range measurement of ambient and traffic noise. These noises are random and the fluctuation of the sound level is always very strong, The measured data and statistial results can be displayed and printed automatically. There are two logarithmic amplifiers in this instrument. Limited by the characteristics of transistors, the dynamic range of each amplifier is only about 60 dB.But these two amplifiers are operated on differant levels, then we use a microprocessor to automatically select ranges of these two logarithmic amplifiers by sampling two outputs of the amplifiers alternatively and processing the data collected. Thus the measureing range of this instrument can be extended to more than 90 dB and the measurement with large dynamic range is realized.