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Optical parameters and hysteresis behaviors play important role as useful diagnostic techniques in quality control for automotive liquids such as brake oils, engine oils and fuels. Refractive index and Brix properties at different concentrations (5 ppm up to 200 ppm) of standard reference chemical liquid solution (Fe(NO3)3) Nonahydrate were determined with an accuracy of ±10-5 using digital multi-wavelengths (refractometer DSR-λ). Practically, the refractive measurements of the selected standard solution have been investigated as a function of temperature (20 οC up to 50 οC) in the spectrum visible range 0.4-0.7 μm. With increasing both wavelengths and temperature the refractive index decreased monotonically. The refractive criteria are also increased with increasing concentration ratio. Moreover, the Brix of the solution have been studied as a function of temperature (20 οC up to 30 οC) with wavelengths in the same visible spectrum range.

Straightness uncertainty in dimensional metrology is an important parameter in precision engineering. Optimization in straightness measurement using soft algorithm techniques is widely encountered solution in coordinate metrology. In this work, we report on the uncertainty in the CMM measurement of straightness feature for a slab surface. Straightness points have been measured precisely in 3D using CMM at NIS. The straightness has been analyzed using a Particle Swarm Optimization (PSO) algorithm. The probability density distribution of the measured spatial straightness was developed using a Sequential Monte Carlo (SMC) technique; forming probability density histogram with 95% confidence level representing an uncertainty in the straightness measurement. Comparison with relevant reports showed and approved that our results are more accurate since we used a computationally efficient modified SMC technique and PSO algorithm.