压缩机,特别是动力用空气压缩机,是一个很大的噪声源,其噪声已成为公害之一。因此,压缩机噪声的声压级,作为压缩机技术经济指标之一,颇为人们所重视。特别是动力用空气压缩机,要达到“安静运转”,噪声指标则是互相竟争的重要条件之一。然而,测量压 Compressors, especially power-driven air compressors, are a large source of noise and their noise has become one of the hazards. Therefore, the compressor noise sound pressure level, as one of the economic indicators of the compressor, quite people attention. In particular, the power of air compressors, to achieve “quiet operation”, the noise index is one of the important conditions for competition with each other. However, measuring pressure