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Measurement of Piston Deposit Thickness Using Laser Profilometer
Abstract:
A novel method of measuring the thickness of deposits on engine pistons,
including within ring grooves, is described. A laser profilometer is used in
conjunction with a rotary stage to measure a continuous profile of the piston
with deposits, and the measurement is repeated after cleaning the deposits from
the piston. Algorithms for aligning the scans and determining the differential
thickness are described, and results are compared to deposit thickness
measurements using a contact-type magnetic induction coating thickness gauge.
This method allows continuous measurement of deposit thickness across the entire
surface including lands and ring grooves as well as quantification of the volume
of the deposits.