Technology

Patented Technology

EVISIVE SCAN microwave non-destructive examination (NDE) technology was patented in the early 1990s. This method was developed primarily to inspect dielectric materials such as rubber expansion joints and fiberglass reinforced piping. This advanced and proven microwave NDE technique coupled with a comprehensive data gathering and display program has made it the preferred alternative method of testing for engineers around the globe.

Microwaves are radiated from the transducer to the specimen being tested. A detectable signal is returned at each interface where the dielectric constant changes (e.g. – where there are delaminations, cracks, holes, impurities. or other defects.) The transducer may be moved relative to the specimen at any desired speed and the scanning speed need not be uniform.

Once the data is collected, the software allows the image to be manipulated to enhance features. Also, since it is in digital form, the scan results can be stored and retrieved later to provide information on how a part or a defect has changed over time. This allows determination of the growth rate of a defect, which is critical to determining ultimate service life.

Evisive vs. Other NDE Technology

Ultrasonic Testing cannot be used for rubber or soft plastic because the polymers absorb nearly all sound energy, and reflect essentially none. The mesh or fabric of a composite material so highly scatters and disperses the ultrasonic waves that an extremely noisy reflection results. Through-transmission air-coupled ultrasonic testing requires access to both sides of the sample.

Eddy current measurements do not work for materials that do not conduct electricity.

Radiography is generally used to detect changes in bulk density. Under most operating conditions the most common flaw leading to failure is delamination. In a delamination failure, an essentially two dimensional separation occurs between adjacent component layers. This separation between layers does not typically result in a detectable change in local density, and is therefore not detectable in a radiograph.

Durometer Testing is the current state of the art for nondestructive testing of rubber parts, using a needle that penetrates a portion of the rubber and connects to a strain gauge. Durometers have poor practical utility, but they represent the best technology currently available for non-destructive testing of rubber joints.

Publications

Presentation

We have released several documents giving insight to our technologies and processes.

International

International

We provide our technology worldwide and have worked on many overseas operations.

Immense Networks