本文讨论和分析了双传声器声强法的原理和测量误差,按照工程级的要求设计和研制了数字式声强计,包括声强探头,放大电路,滤波器,单片微机系统,数据处理和数字显示等。并对该声强计的性能进行了测试,分析和讨论。 This paper discusses and analyzes the principle and measurement error of the double microphone sound intensity method. According to the requirements of the engineering level, the digital sound intensity meter is designed and developed, including the sound intensity probe, amplifier, filter, single chip microcomputer system, data processing and Digital display and so on. The performance of the sound intensity meter was tested, analyzed and discussed.