A method is described which allows to measure pole figures under
the condition of constant information depth. This is achieved by
using ω- and χ-tilt simultaneously. In order to obtain satisfactory
integrated intensities the use of a position sensitive detector is
nearly indispensable. The functional relationship between
ω and χ for constant information depth and the transformation
of Euler angles {ϕ1,φ,ϕ2} to pole figure angles {α β} are given as well as the necessary intensity
correction. The use of ω-tilt leads to blind areas in the centre of pole
figures which can, however, be compensated by increasing the
number of pole figures and using appropriate ODF programs.The method was tested with composite samples obtained by stacking
aluminium foils with known textures but with exchanging rolling
and transverse direction of the uppermost foil. The results will
be shown in the second part of the paper.