Development of Optical Wave Microphone Measuring Sound Waves with No Diaphragm
The optical wave microphone with no diaphragm(or the optophone),which can detect sound waves wave-optically by using a laser beam without disturbing a sound field and an air flow,is presented as a novel sound measurement technique.In the optical receiving system,the diffraction light generated by sound waves is passed through an optical Fourier-transform system and is focused on an observing plane.The spatial position of diffraction light pattern in the plane is rotated around the laser beam axis when changing the sound incidence angle to the axis,which property can be used as a separation method of sounds with different incidence angles and a hand control method of directivity.In the present experiment,an optical fiber bundle with 16ch fibers is used to detect the diffraction light patterns generated by sounds with different incidence angle.The experimental results show that it is possible to separate two sounds with incidence angle difference of 90 degree and to control the receiving directivity by synthesizing some of fiber output signals.
Yoshito Sonoda Takashi Samatsu Toshiyuki Nakamiya
Graduate School of Industrial Engineering,Tokai University,Toroku 9-1-1,Kumamoto 862-8652,Japan
国际会议
Progress in Electromagnetics Research Symposium 2013(2013年电磁学研究新进展学术研讨会)
台北
英文
359-363
2013-03-01（万方平台首次上网日期，不代表论文的发表时间）