On-line measurement for the depth of the oil pump jet pressure vessel

In this paper, the authors introduce a new method for measuring the pressure vessel depth of the oil pump jet by indirectly measuring the dimension of the punch needle. The system is a type of photo-electronic-mechanic device, which includes an area matrix CCD image sensor, optical system, microprocessor unit and numerical control machine tools. This system can complete the high-speed data acquisition by two-port RAM technique, meanwhile the dynamic resolution of the measurement system is up to 1 /spl mu/m by data processing and modeling software.