DESIGN AND APPLICATION OF A NON–CONTACT ULTRASOUND VELOCITY MEASUREMENT SYSTEM WITH AIR INSTABILITY COMPENSATION

摘要

This article describes the design and application of a non-contact ultrasound air instability compensation transducer. The spatial impulse response approach was used to simulate the reflected energy from the reference in the path of the ultrasound from the non-contact transducer to compensate for the error provided by the instability of the air media during measurements. Based on simulation, a model was suggested for the design of a reference for the 1.0 MHz 12.5 mm diameter non-contact ultrasound transducer. Simulation results highly correlated with the measured data to provide R 2 values greater than 0.99. The improved stability of the thickness and ultrasound velocity measurements of polystyrene and cheddar cheese was demonstrated with a constructed air instability compensation transducer. Results indicate that the non-contact air instability compensation ultrasound technique has excellent potential for non-destructive, rapid, and precise quality measurement and monitoring in varying environmental conditions, as in a food manufacturing plant or a process industry