yliääni

yliääni is a Finnish term that translates to "ultrasound" in English. It refers to sound waves with frequencies higher than the upper limit of human hearing, which is typically around 20 kilohertz (20,000 Hz). These high-frequency sound waves are beyond the range of what most people can perceive.

Ultrasound has a wide range of applications in various fields. In medicine, it is extensively used for diagnostic imaging, such as in prenatal scans to visualize a developing fetus or to examine internal organs. Ultrasound therapy is also employed for pain relief and tissue healing. In industry, ultrasound is utilized for non-destructive testing of materials, cleaning, and welding.

The generation of ultrasound typically involves piezoelectric crystals that vibrate at high frequencies when an electric current is applied. Conversely, when struck by sound waves, these crystals produce an electric charge, allowing for the detection of ultrasound. The short wavelengths of ultrasound enable high-resolution imaging and precise measurements. Its ability to travel through different media and reflect off boundaries makes it a versatile tool.