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信息传输同人类历史一样悠久。十九世纪人们把声音转换成电信号经远距离传输获得成功,它才有了巨大的飞跃。目前的传声器,尤其是测量用电容传声器,很适于通常的声录制。但在特殊测量时,如邻近螺旋桨和转片时会受干扰。利用强度随声波或空气脉动压力而变化的光线,就能达到无干扰测量的目的。本文阐述为此而制成的“纹影光传声器”。
Information transmission is as long as human history. In the nineteenth century, when people succeeded in converting sound to electrical signals over long distances, it made a huge leap forward. Current microphones, and particularly condenser microphones for measurement, are well suited for typical sound recording. However, during special measurements, such as near the propeller and the rotor will be disturbed. The use of intensity changes with the fluctuating pressure of air or air can achieve the purpose of interference-free measurement. This article describes the “shadow light microphones” made for this purpose.