Underwater target detecting device based on single-photon counting method

Abstract

The invention discloses an underwater target detecting device based on a single-photon counting method. Narrow-pulse laser which is output from a pulse laser is divided into two parts by an optical isolator assembly. One part is directly detected by a photoelectric detecting module. An electric signal which is output from the photoelectric detecting module is input into a time-related single-photon counting system and a time delay module, wherein the signal which is input into the time-related single-photon counting system is used as a timing starting signal. The signal which is input into thetime delay module is used as a distance gating control signal. The other part irradiates a target after light beam shaping. After a target echo signal is emitted to the single-photon detecting module, the target echo signal is used as a timing terminating signal for being input into the time-related single-photon counting system. Through performing data processing on the signal of the time-related single-photon counting system, thereby obtaining target information. The underwater target detecting device has advantages of high precision and high sensitivity and furthermore facilitates realization of low power consumption and miniaturization of an underwater target detecting system.

Description

Technical field [0001] The invention belongs to the technical field of laser detection, and specifically relates to an underwater target detection device based on a single-photon counting method. Background technique [0002] The underwater target laser detection system involved in the present invention is a system that realizes underwater target detection by measuring pulse flight time. The system calculates the distance of the target to be measured by measuring the time between the launch of the laser pulse and the receipt of the target echo pulse, combined with the propagation speed of the light in the water medium. First, a pulsed laser light source emits a signal beam. The beam is divided into two parts in the optical path. One part of the beam is received by a photodetector. The optical signal received by the photodetector is converted into an electrical signal and then input to the data acquisition system. The signal is stored and the time corresponding to the peak of the...

AI Technical Summary

Problems solved by technology

[0003] This method makes full use of the characteristics of short wavelength and good directionality of the laser, and has unique advantages such as speed, accuracy, and clarity. However, the disadvantage is that on the one hand, due to the strong attenuation characteristics of different water media on light waves, it greatly restricts underwater targets. Detection distance; on the other hand, the backscattering effect of the underwater environment on the beam affects the laser ranging accuracy and imaging effect

To improve the detection distance and detection accuracy, the traditional technical method is to increase the laser emission power and use a laser with an extremely narrow pulse, which not only greatly increases the volume and cost of the laser, but also puts forward more requirements for the underwater application platform. High requirements are not conducive to military and civilian application requirements for efficient and high-precision underwater target detection

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