Non-destructive measurements of the glass-fibre content in reinforced plastics by means of microwaves
Abstract
So far, the usual means of measuring the glass content in glass-fiber reinforced plastics has involved destruction of the material. A new method allows such measurements to be made nondestructively by means of microwaves. The method is based upon the difference in permittivity between the glass and the plastic material. The resonance frequency of a measuring coaxial probe is influenced by the permittivity of the composite material, and by use of probes with differences in field penetration into the material information of the fiber distribution can be acquired.
- Publication:
-
4th European Microwave Conference
- Pub Date:
- 1974
- Bibcode:
- 1974eumw.conf..132F
- Keywords:
-
- Glass Fibers;
- Microwave Probes;
- Nondestructive Tests;
- Permittivity;
- Reinforced Plastics;
- Resonant Frequencies;
- Cavity Resonators;
- Coaxial Cables;
- Frequency Measurement;
- Signal Measurement;
- Superhigh Frequencies;
- Instrumentation and Photography