To meet the demand of 19in radio frequency instruments for high reliability chassis, the chassis structure design and manufacturing was carried out focusing on the chassis components, mainly including chassis structure design, semi-rigid cable module design, metal parts processing, semi-rigid cable module processing and chassis assembly. The final equipment passed the environmental adaptability test assessment, and its performance met the requirements for the use of the four-level equipment in GJB3947A-2009. demonstrates the feasibility of the chassis structure design and manufacturing, and providing a reference for the design and manufacturing of the same type of 19in radio frequency chassis.
To meet the demand of miniaturized instruments for high reliability chassis, the chassis structure design was carried out focusing on the environmental adaptability of the chassis products, mainly including the overall layout design, anti-vibration and impact design, electromagnetic compatibility design, thermal design and three-proof design. The final product has passed the test verification, and meets the use requirements of the four-level equipment in GJB3947A-2009, demonstrates the feasibility of the structure design, and providing a reference for the structure design of the same type of chassis.
A new laser differential reflection-confocal lens thickness measurement (DRCTM) method is proposed for the high-accuracy measurement of the lens thickness. DRCTM uses the test beam reflected from the lens first and last surface to determine the vertex positions of the two surfaces. Differential confocal technology is used to precisely identify the lens vertexes of the lens first and last surfaces, thereby enabling the precise measurement of the lens thickness. Compared with the existing measurement methods, DRCTM has high accuracy and strong anti-interference capability. Theoretical analysis and experimental results indicate that the DRCTM measurement error can be limited to 0.0015%.
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