无人机机载载荷安装位姿实时测量系统设计

主要描述了一种快速6自由度测量系统的硬件及软件设计,该测量系统能够对无人机遥测平台上机载载荷进行实时安装检测,确保所有搭载的载荷都能实时调整到预定位置上。系统基于视觉测量原理,利用固定式多目标光学靶的空间坐标将物体的空间位置姿态的变化反演出来,实现物体的6D快速测量,其中角度测量重复性为0.05°,位置测量重复性为0.05 mm。     

多功能过程校验仪的检定及问题探讨

多功能过程校验仪越来越多地应用于现场校验,为现场检修维护人员提供了方便。由于在检定过程中的一些认识上的问题,计量人员在检定过程中往往不能选择合适的标准仪器,本文通过对多功能过程校验仪检定过程中出现的问题进行分析,提出了检定过程中标准仪器选择和使用的一些看法,并对热电偶输出与测量功能的检定提出了一些建议。     

Deposition of cBN films by ion sputtering of SiB6 and AlB12 boron-base materials

Films of cubic boron nitride were deposited on to Mo, Si, WC–Co substrates heated up to 600–800 °C in a three-electrode d.c. device with a discharge localization by magnetic field. During SiB₆ and AlB₁₂ sputtering in Ar–N₂ and Ar–N₂–H₂ atmospheres, the low-frequency (LF) substrate bias ranged from 50 to 500 V (20 kHz), and the total pressure was 1.5 mTorr. The effects of gas atmosphere, LF substrate bias and ionization energy on structure formation and composition of the films being deposited have been studied. The film structure and composition were examined using IR spectroscopy and X-ray diffraction analysis. The deposited films have polycrystal structures with a hexagonal, wurtzitic or cubic symmetry. The predominated quantity of cubic phase is observed in films deposited using SiB₆ in Ar–N₂ atmosphere at a LF substrate bias of 500 V. By introducing hydrogen into the gas atmosphere at a ratio of three parts of N₂ to seven parts of H₂, a wurtzitic phase forms in the film. The cubic BN phase is observed in films obtained using AlB₁₂ if the LF substrate bias is between 200 and 300 V. The Vickers microhardness of the films produced reaches 30.0–35.0 GPa.