Anisotropic measurements of rubber sheets with an X-band three-wave interferometer

A three-wave recording interferometer modified for the anisotropic measurement of rubber sheets containing carbon particles is discussed. Due to the modifications, it is no longer necessary to use an anechoic chamber, and the disadvantages of antennas are eliminated, together with diffraction along the edges of samples. After a description of the experimental instrument, some of the measurement results are presented. >