Inspection on roundness instrument based on virtual instrument

Following a brief review on the advance of national and international roundness inspection technique,the inspection technique of obtaining roundness of mechanical parts is proposed,which is based on virtual instrument and Charge-Coupled Devices(CCD).By roundness image processing,the characteristic information of round parts can be got.Thus we can precisely and swiftly test the roundness error and correlative geometry dimension and shape error of the parts.Through the comparison to the standard objects or design demands,we can estimate whether the part is qualified.Experiments show that the virtual instrument of roundness measurement is non-contact measurement instrument and is of fast speed and high precision.