Ultrasonic techniques involve the use of high-frequency sound waves to image and measure properties of materials or biological tissues. These techniques make use of the principle that sound waves propagate differently through different materials, allowing for the detection of defects, abnormalities, or changes in properties such as density, elasticity, or thickness. Ultrasonic techniques are commonly used in medical imaging, non-destructive testing of materials, and industrial applications such as cleaning and welding. The development of ultrasonic techniques has led to advancements in fields such as medical diagnostics, structural engineering, and material science.