Thermal/infrared testing: mapping the temperature from the area, determined by the infrared radiations emitted. The superior-frequency vibrations that are the basis of ultrasonic NDT typically take place as either longitudinal waves (particle movement parallel to wave path) or shear waves (particle movement perpendicular to wave path). All generally utilized NDT https://josmarconsulting.com/landing-pages/best-geo-technical-service-in-india.html