水下气泡幕激光后向探测中的背景噪声抑制

水下气泡幕的激光后向探测中,背景噪声尤其是水体的后向散射光信号对信号的接收和处理造成了严重的干扰.对该问题进行分析,并进行了实验研究,调整发射器和接收器之间的距离,对后向散射光信号功率进行实测,对数据进行了比较分析.结果表明,适当增大接收器和发射器之间的距离,有利于水体后向光散射信号的抑制,可提高有无气泡幕信号之间的差异,从而提高水下气泡幕激光后向探测的能力.

Restraint of Background Noise for Laser Backward Detection of Bubble Films in Water

Restraint of background noise,for example water interference,is an important problem for laser backward detection of bubble films in water.The problem was analyzed and an experiment was carried out.The powers of light backward scattered from water and bubble film were measured when the distances between the laser and the detector were changed,and the data were analyzed by comparison.The results show that moderately increasing the distance between laser and detector will favor restraint of water backward scattering light interference and will enlarge the difference between signals having and having no bubble films,so it will improve the laser backward detection capability of bubble films in water.