Research On Multi-parameter Measurement And Control System In Laser Warning

Laser weapons play an increasingly important role in modern wars.Laser reconnaissance,laser ranging,laser guidance,and high-performance laser weapons are widely used in modern wars.In order to cope with the increasingly serious laser threat,it is of great significance to study the multi-parameter measurement and control system of high-performance laser warning,and realize the simultaneous measurement of the attack direction,wavelength and pulse width of two-dimensional laser for rapid response to security threats.In this paper,the multi-parameter measurement and control system of laser warning is studied.The measurement principle is that under the condition of known optical system,the incident angle and wavelength of attacking laser can be judged by the position of zero-order and first-order diffraction spots,and the mathematical relationship is theoretically deduced.The principle of laser pulse width measurement based on time-digital conversion is analyzed.Based on the above principles,the main contents of this research are as follows:Firstly,the Fraunhofer diffraction of black-and-white grating incident by laser at any angle is studied,and the relative light intensity distribution of the diffraction image is calculated theoretically.The relationship between the center position of the zero-order and positive and negative-order bright lines and the incident laser information is obtained.The relationship between the wavelength and direction of the incident laser and the diffraction spot is deduced reversely by data processing,and then the method of calculating the incident laser parameters（wavelength and incident angle）is obtained.At the same time,the principle of measuring pulse width by time-to-digital conversion is analyzed.Secondly,the pulse laser detection circuit,pulse shaping circuit and time digital conversion control circuit are designed.The photoelectric conversion and time interval measurement of the pulse laser signal are completed,and the pulse width measurement and control unit are verified by experiments.The control system of the array detector imaging system is designed,and the imaging effect is verified.The laser spot images of different central wavelengths are collected from different angles,and the extracted spot center coordinates are analyzed.Finally,the assembly and test of the laser warning multi-parameter measurement and control system are completed.The measured wavelength,azimuth angle,pitch angle and pulse width are tested,and the measurement results are analyzed.The experimental results show that the azimuth angle of the system reaches 95°,the pitch angle reaches 75°,the spectral measurement range is 400～1700 nm,and the minimum measurement pulse width is 5 ns.The laser warning multi-parameter measurement and control system can be applied to practical needs.