6. Sound wave and ultrasonic measurement systems
This method of measuring true levels without contact with the product, based on the reflection of a sound or ultrasound wave on the product/gas interface, was long considered promising, but difficult. A better understanding of the phenomena involved and the advent of more sophisticated electronics (notably microprocessor-based) have enabled us to master the problems and produce perfectly reliable installations.
6.1 Characteristics of sound and ultrasound waves
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Sound wave and ultrasonic measurement systems
Microwave systems
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