Non-contacting level measurement of irregular surfaces using coded ultrasound and cross correlation analysis

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Abstract
An instrument has been developed for measuring the level of solid materials stored in a container in which ultrasound bursts with random durations are transmitted towards the solid/air interface. The acoustic transit time is measured by cross correlating the transmitted signals and received echoes. This technique overcomes erroneous measurement associated with conventional single pulse systems, caused by rogue reflections from the rough surface. This is achieved because the randomness of the ultrasound bursts alter the transmitted beam angle and hence the solid surface is scanned in a random manner. The rogue echoes are then averaged out in the cross correlator, and the major peak always corresponds to the correct level.

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