Vasco Teixeira R & D, coatings production and inspection, stress analysi University of Minho - Physics Centre, Portugal, Joined Feb 2000, 3
Vasco Teixeira R & D, coatings production and inspection, stress analysi University of Minho - Physics Centre, Portugal, Joined Feb 2000 3
07:42 Mar-15-2000 Measurement very low emissivity in coatings and surfaces
I am looking for a simple equipment that measures directly the surface emissivity of thin coatings deposited on glass, aluminium or copper. The application is for quality inspection sputtered solar absorbers to be used in thermal collectors for water heating. At 100 degress celsius the emissivity is about 0.05. The epsilon range should be up to 0.5 or more. The IR wavelenght should be the correspondent of 100 degrees up to 500 or more.
Pulse thermography is a non-contact test method that is ideal for
the characterization of thin fil
ms and coatings or the detection
defects. With a remarquable short test time and a high detection
sensitivity, the Telops TESTD-PT is the perfect tool for non-
destructive testing. With such high frame rates, it is even
to investigate highly conductive or diffusive materials.
The conformability is obtained with a flexible membrane filled with water between the transducer and
the inspected component. The coupling between the membrane and the component requires a small quantity of water or couplant. The conformable wedge combines the acoustic performance of immersion technique with good coupling and low attenuation.