Long range ultrasonics is a type of nondestructive testing (NDT) method that uses high-frequency sound waves to detect and evaluate defects in materials. Unlike traditional ultrasonic testing, which uses sensors that are in direct contact with the material being tested, long range ultrasonics uses sensors that can be positioned a few inches or even several feet away from the material.

This allows the test to be performed without the need for direct access to the surface of the material, making it well suited for inspecting large or complex structures, such as bridges, buildings, or pipelines. Long range ultrasonics is commonly used to detect cracks, voids, and other defects in materials that could affect their strength and performance.