Research On Testing Technique Of Airborne Laser Of Dynamic Irradiation Precision

The problems of alignment of optical axes between laser axis and visible light axis is solved by using testing technique of airborne laser of dynamic irradiation precision. As an important index of multi-optical axis aiming systems, alignment of optical axes has a direct influence on the hitting probability and tracking accuracy of the system on the target. The infrared up-conversion is a key of components. A mirror and a beam splitter should be installed in the light path to reflects and separates the light. Simpler structure, smaller volume and better image quality advantages to belong to this test equipment.Design parameters of collimating optical system was determined by analyzing the working environment and technical specifications of testing system. Visual assessment can be replaced by axial calibrating system. And improve the self calibration of collimator to improve the illuminate accuracy. The optical system was designed for calibrating the two optical axis parallelism of visible light and 1.06μm laser. The optical system comprised off-axis reflective structure which containing a high-order paraboloid and a secondary hyperboloid, a mirror and a beam splitter should be installed behind the secondary baffle to reflects and separates the light in order to compressing volume.1mm-diameter-aperture halogen lamp with ZnS filter provides uniform illumination for calibration system. The calibration system has the advantages that compact in stucture and small in size, which image quality approach the diffraction limit at transmissional and reflectional light in full band. The influence factors of energy loss and high semipermeable coating is analyzed and designed. The transmittance of optical system is proved to satisfy the technical requirement. A proper algorithm is selected to calculate the center of spot by analyzing background noise and other information of image.Design results show that the image quality of axial object lens is good, and its radius of defocused spots is confined within 6.581μm, distortion is less than 0.05%. FOV is 5.14°. relative aperture is 1/3. total track is 75.6mm. Aperture of the optical axis parallelism of two-axial system is 240mm, focal length is 1500mm. The axial dimension of the system approximate 470mm, radial size is about 447mm. The diameter of defocused spots in transmitted beams are 3.365μm, while in reflectional beams are 3.586μm. Its image quality reaches the diffraction limit at refractional and reflectional light in full band.The simulation results that the two optical axes angle is 6" show that accuracy of this system can meet the designing requirements. The system has extensive application prospect for the trend of multi-optical axis parallelism calibration system to be automatized and lightweight.