As divergent light from a fiber coupled LED enters an interferometer
setup including a Kösters-Prism, it creates a white light interference
pattern. The fringes of the interference pattern change their pitch and
angle depending on the angle of the measurement mirror. Experimental
results show that the analyzable measurement range of a compact
experimental setup with short ways for the light is up to 16'. Boresight
errors inside the Kösters-Prism have a crucial influence on the shape of
the interference pattern. The correlation between the slope of the
measurement mirror and the slope of the interferences can be described by
an arctangent function. The larger the boresight errors, the flatter the
increase of the arctangent function at the zero point. Moreover, it has
been found that the distances between the fringes become smaller, as the
misalignment of the point of light onto the CMOS-line becomes wider. The
relationship between the angle of the strip slope and the angle of the
measurement mirror slope is 1°=0,67'' at the turning point (test series 3,
measurement series 2).