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基于光电接收目标的漫反射光原理,采用红外激光探测室内声波,在对目标特性研究和漫反射回波信号光功率估算的基础上,设计和研制了实验系统。用红外激光探测从玻璃目标返回带有受声波调制的激光漫反射回波信号,在6-63 m距离及直接反射光线与探测器光轴之间的夹角β≤±4°时,可以听见所探测到回波信号中的声音;当β=4°-15°时,可以探测到激光漫反射回波信号,但听不到声音。实验证明,利用漫反射激光探测室内声音的方法是可行的。
Based on the diffuse reflection principle of photoelectric receiving target, infrared laser is used to detect indoor acoustic wave. Based on the research of target characteristic and optical power of diffuse reflection echo signal, experimental system is designed and developed. Return infrared diffusely reflected echo signal with acoustic modulation returned from the glass target with infrared laser detection, at 6-63 m distance and the angle β ≤ ± 4 ° between the direct reflected light and the detector optical axis The detected sound in the echo signal; when β = 4 ° -15 °, the laser diffuse echo signal can be detected, but the sound can not be heard. Experiments show that the use of diffuse laser detection of indoor sound method is feasible.