The Doppler technique is used extensively in clinical diagnostic ultrasound devices such as blood flow measurements and cardiological diagnosis. Other industrial applications of ultrasound include cleaning equipment which utilizes ultrasound to form bubbles in the cleaning or sterilizing liquid. Ultrasonically agitated baths containing abrasive particles are used to cut metals and for erosive cleaning. Ultrasonics is also used to form foam in beverage bottles and cans to expel air before closing occurs. Ultrasound may be used to generate frictional heat for sealing thermoplastic packaging.
Airborne ultrasound is utilized in rodent repellent systems.
Ultrasonic energy is used in clinical therapy as a deep heating agent. These are only a few of the many uses of ultrasound.