直接光强检测方式分析激光遥测水下声场探测灵敏度

Sensitivity Analysis of Underwater Sound Field with Laser Remote Sensing by Direct Detection

激光声遥感探测水下声信号技术,是比以往任何一种水声探测技术都先进的技术,但探测系统的灵敏度一直未曾分析。得出了在直接光强检测方式下表面微波的最小可探测幅度值,并且分析了最小可探测幅度值分别和探测高度、接收孔径的关系。在直接光强检测方式下,针对水下声场形成的表面微扰现象,通过建立探测系统的一维物理模型进行理论推算。直接光强检测方式下表面微波的最小可探测幅度值为0.424 4mm,当表面微波幅度超过该值时,探测系统灵敏度完全满足对水下声场的实时监测要求。

Laser remote sensing of the underwater sound field is more advanced detection technology for underwater object search, however, the sensitivity of the detection system had not been analyzed. This article analyzed three laser remote sensing methods for underwater sound field, and then studied the surface micro-wave formed from underwater sound field. It was obtained through the theoretical calculation that the minimum detection limit of amplitude was 0.424 4 mm for surface microwave. By analyzing the relationship between the minimum detection limit of amplitude, the height of sender and the aperture of receiver, it was understood for the theoretical basis of influence factors for the detection of underwater sound field, also provided for the basic idea for improving sensitivity.