Caption: Fig.2a Schematic representation of reflection
polariscopeThe surface stress [[sigma].sub.s] in all the specimens was measured with the scattered light
polariscope SCALP (Glasstress Ltd.; Fig.
Figure 2.8 shows the optical image of the cube in the plane crossed
polariscope when polarizing elements are parallel to the borders of the cube.
Color patterns are produced by the internal stresses which are revealed by a
polariscope. (11) The
polariscope is comprised of two main elements, the polarizing filters and a light source as seen in Figure 3.
When light that has experienced retardation is viewed with a
polariscope, the two components of the original light beam interfere with one another, resulting in a visible display of varying colors and intensities (fringes) wherever stress is present in the material.
For industrial applications, a portable scattered light
polariscope, referred to as the SCALP, has been developed at GlasStress Ltd [6].
The loaded models were examined in the polarized light of a circular
polariscope, both in white and monochromatic light.
At the same time, when GASP permits measurement of the surface stress at the tin side of glass panels [2], the scattered light
polariscope SCALP permits measurement of the stress profile through the panel thickness.
This article also uses the
polariscope (Coretech-nology, Taiwan) to measure the birefringence of molded microlens arrays.
The model's stress analysis was made through the fotoelastic method using a
polariscope, at room temperature.
In addition, the doublets will show a peculiar behaviour in the
polariscope, with no distinct extinction, which points toward an assembled stone.
The average birefringence, <[n.sub.zz] - [n.sub.[theta][theta]]>, was measured using a Gaertner optical
polariscope L305 equipped with a light source of a wavelength of 5.65 X [10.sup.-7] m and a seven-order L-133-A Babinet compensator.