Surface Scattering Properties Of Non-cooperative Laser Measurement System

Non-cooperative target laser measurement technology has become the newdemands of the development of laser technology. No need cooperative target makelarge space measurement or non-contact measurement more effective, easier andmuch safer. However, It is precisely because of no cooperative, the incident lasercontact with the targets surface directly. So received laser is not only very weak, butalso complex and uncertain. That makes our non-cooperative measurement system hasno high precision and wide range. Therefore, it’s meaningful for non-cooperativesystem to study scattering characteristics of the target surfaceTo solve this problem, first of all, this paper summarize the status of thescattering characteristics in other areas, and make it clearly that what we should do isto study scattering properties of the1550nm infrared laser incident to machiningsurfaces. Then the basic theory of scattering characteristics is to be introduced.According to the feature of target surfaces, experimental research is based on thebidirectional reflectance distribution function (BRDF). After introducing BRDF andit’s measurement methods, the properties of target is introduced and analyzed. Thenaccording to this measurement needs, designed and built a hemispherical surfacescattering characteristics of space target measuring device for different roughness, andmeasured the targets in the different incident angles and different azimuth anglesrespectively.After that, according to the non-cooperative target measuring systemconfiguration, the system is mainly receives the backscattered light. Therefore, thearticle designed and built backscattering experiment measuring systems, andmeasured targets which processing by different methods. Finally, the measurementresults of each experiment were analyzed and discussed.Experimental results show that all of the surface roughness, texture, and thezenith angle of the incident light, the azimuth angle will affect the regularity of lightscattering. For the scattering of the hemisphere, the roughness effects the distributionof scattering energy in space. The smoother surface, the greater the light scatteringpeak. The surface texture impact change speed of energy near the peak. Regardless ofincident direction, the energy distribution is consistent with texture direction. Thezenith angle of the incident light determine the peak position. For the average surface, specular reflection direction is always the direction of the scattering peak. Fornon-random rough surface, the peak position of different incident direction would bedifferent. For backscattering, the maximum value of the backscattering is when thethe incident angle is0°.And the scattering would be very weak if incident anglebigger than5°.Moreover, the roughness and processing method also effect thebackscattering properties.