Laser Testing Methods
Laser Testing includes three techniques, Holography,Shearography and Profilometry. As the method name implies, all three techniques user lasers to perform the inspections. LM TECHNIQUES Holographic Testing Holographic Testing uses a laser to…
How GPR Works
Ground penetrating radar operates by transmitting pulses of ultra-high frequency radio waves (microwave electromagnetic energy) down into the ground through a transducer (also called an antenna). The ground penetrating radar…
Ground Penetrating Radar
What is Ground Penetrating Radar? Ground penetrating radar (GPR) is a non-destructive geophysical method that produces a continuous cross-sectional profile or record of subsurface features, without drilling, probing, or digging.…
GUIDED WAVE TESTING (GW) Overview
Guided wave ultrasonic testing detects corrosion damage and other defects over long 33 ft. – 165 ft. distances in piping. A special tool (transducer ring) is clamped around the pipe…
Remote Field Sensing
Eddy current testing for external defects in tubes where external access is not possible (e.g. buried pipelines), is conducted using internal probes. When testing thick-walled ferromagnetic metal pipes with conventional…
Pulsed Eddy Current Inspection
Conventional eddy current inspection techniques use sinusoidal alternating electrical current of a particular frequency to excite the probe. The pulsed eddy current technique uses a step function voltage to excite…
Swept Frequency
Swept Frequency Swept frequency eddy current techniques involve collecting eddy current data at a wide range of frequencies. This usually involves the use of a specialized piece of equipment such…
Multiple Frequency Techniques
Multiple frequency eddy current techniques simply involve collecting data at several different frequencies and then comparing the data or mixing the data in some way. Why the need for multiple…
Advanced Techniques – Scanning
Eddy current data can be collected using automated scanning systems to improve the quality of the measurements and to construct images of scanned areas. The most common type of scanning…
Thickness Measurements of Non Conducting Coatings on Conductive Materials
The thickness of nonmetallic coatings on metal substrates can be determined simply from the effect of liftoff on impedance. This method has widespread use for measuring thickness of paint and plastic coatings. The coating…
