Research on photoelectric detection technique applied to underwater detection system using pulsed laser

Jionghui Rao; Gang Lu; Kecheng Yan; Xiaohui Zhang; Min Xia; Donghua Zhu

doi:10.1117/12.790879

22 February 2008 Research on photoelectric detection technique applied to underwater detection system using pulsed laser

Jionghui Rao, Gang Lu, Kecheng Yan, Xiaohui Zhang, Min Xia, Donghua Zhu

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Proceedings Volume 6622, International Symposium on Photoelectronic Detection and Imaging 2007: Laser, Ultraviolet, and Terahertz Technology; 66221D (2008) https://doi.org/10.1117/12.790879
Event: International Symposium on Photoelectronic Detection and Imaging: Technology and Applications 2007, 2007, Beijing, China

Abstract

Unlike optical detection of air targets, detecting underwater targets by optical technique is more complicated because of strong backscattering and absorption attenuation caused by water itself while rays propagating underwater. If a pulsed laser is employed as the active illuminator of an underwater detection system, it's possible to decrease the effect of backscattering light from water to a large degree and improve detection distance of the system consequently. In this paper, a set of underwater optical detection system is designed. This system can be used to detect underwater targets or micro bubbles in water. In order to optimize the system's performance, different photoelectric detectors are used in the system and contrastive experiments are implemented. A high-speed PMT and a high-speed PIN photodiode are employed without adjusting other system components. Accordingly, optical receiving systems and amplification circuits were designed, and a series of contrastive experiments were implemented. In these experiments, a board and micro bubbles mass works as targets which are placed in changing distance to detection system. By analyzing of the experimental results, it is concluded that both of the PMT and PIN detector can detect the reflected signal of board and micro bubbles effectively in a certain range. And they can be used in different applications because of their different characteristics.

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Jionghui Rao, Gang Lu, Kecheng Yan, Xiaohui Zhang, Min Xia, and Donghua Zhu "Research on photoelectric detection technique applied to underwater detection system using pulsed laser", Proc. SPIE 6622, International Symposium on Photoelectronic Detection and Imaging 2007: Laser, Ultraviolet, and Terahertz Technology, 66221D (22 February 2008); https://doi.org/10.1117/12.790879

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KEYWORDS

Target detection

Signal detection

Sensors

Pulsed laser operation

Submerged target detection

Geometrical optics

Backscatter

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