Implementation of the Surface Roughness Instrument (SRI) Controller

摘要

The document describes the theory and implementation of the Surface Roughness Instrument Controller (SRIC) program. The controller is part of the Inspection Workstation (IWS) in the Automated Manufacturing Research Facility (AMRF) in the Center for Manufacturing Engineering at the National Bureau of Standards. The SRIC supervises the surface roughness inspection of a part. The inspection is data driven. The SRIC controls two pieces of equipment -- the surface roughness instrument (SRI) and the automatic dial indicator (ADI). The SRI monitors surface roughness by measuring the angular distribution of light scattered from the surface of a part. It does its job in coordination with the IWS robot. Using the SRI optical signals as sensory input, the robot properly aligns the part in front of the SRI so that a valid optical scattering reading is obtained. (The ADI is used to help the robot position the part in front of the SRI for its initial reading.) The SRIC uses the optical data obtained to compute an rms value for roughness and a roughness average.