Ultrasonic measurement

Ultrasonic measurement

The ultrasonic measuring system works with ultrasound for distance measurement in air, unlike ultrasound for material testing, uses low frequency acoustic converters to keep down attenuation. Transmitted vy an ultrasound converter it propagates through air until it hits a reverberant surface which partially reflects it. The acoustic converters operate according to two different principles, as piezo-ceramic oscillators of an extremely narro bandwith or as capacitive oscillators of a wide bandwidth without prominent resonance frequencies.