Patent ID: 6873412
Filing Date: 2005-03-29
Classification: G01N,G02B

Abstract:
1. Method of suppressing multiple scattering during examinations of turbid media using a three-dimensional cross-correlation technique, in which for adjustment of the method a medium is placed in a test container ( 6 ) and illuminated by two parallel laser beams (B, C) that are inclined in such a way that their point of intersection is situated in the test container ( 6 ), and that detection optics ( 14 a , 14 b ) are adjusted to this point of intersection so that the geometry of the detected scattered light is congruent with that of the laser beams (B, C), the scattered light being admitted by the detection optics ( 14 a , 14 b ) and the amplitude of the cross-correlation functions being optimized by using a tiltable mirror ( 15 ), characterized in that first a laser beam (A) is directed so that it strikes the wall of the test container ( 6 ) perpendicularly and is reflected on this wall so that the reflected beam (A 1 ) returns back into the incident laser beam (A), that the laser beam (A) is split into two parallel laser beams (B, C), and that these parallel laser beams (B, C) are inclined so that their point of intersection is situated in the test container ( 6 ), and that in a further step a mirror surface ( 87 ) passing through this point of intersection is provided in the test container ( 6 ), and that the intersecting laser beams (B, C) are thereby reflected, and that the reflected laser light is admitted by the detection optics ( 14 a , 14 b ) situated on the detection side, and the mirror surface ( 87 ) is subsequently removed and a weakly scattering liquid is filled into the test container ( 6 ), and the amplitude of the cross-correlation functions is optimized.