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 a scattering laser principle of photoelectricity sounding from the target, a infrared laser is used in detecting sound wave. On the foundation of researching target specific feature and estimated scattering laser power of echo signal, the experimental equipment is designed. In experiment, a sound of modulation signal is detected from glass target in scattering infrared laser. If the distance between target and light source was 6～63 m and the reflection of laser ray is β≤±4° (an angle with the detector spool) the sound of echoic modulation signal should be heard. If β=4°～15°, the echo signal of scattering laser can be detected, but the sound cannot be heard. Experiment proves that the method of sounding sound wave using scattering laser from the target is feasible.