Method and device for suppressing multiple scattering when examining turbid media by means of three-dimensional cross-correlation technique

摘要

The invention relates to a portable device for carrying out examinations of turbid media using a three-dimensional cross-correlation technique and for suppressing the influence of multiple scattering, as well as to an adjustment method for adjusting the device. The device has a base plate (1) upon which an adjustable laser (2) is positioned in tilting devices or by means of mirrors for directing the laser beam perpendicularly onto the wall of a cuvette (6) filled with a medium to be examined. The device is provided with a translucent plate (7) which in some sections is completely mirror-coated and in other sections is partially mirror-coated and which serves as a beam splitter (4). The plate is firmly secured to the base plate (1) using a positioning fixture (8) whose support surface (16) for the translucent plate (7) is situated at a fixed angle with respect to the base plate (1). The positioning fixture (8) is detachably secured to the base plate (1) and to a cuvette fixture having receptacles for the cuvette (6) and for a cylindrical translucent container (70) filled with a liquid which is situated on the base plate (1). Displacement devices for the cuvette fixture (5) which allow the cuvette to be continuously positioned are also mounted on the base plate. Tilting and displacement devices for at least two detection optics are situated so that they can be fixedly positioned on a base plate on the detection side of the device and so that this base plate can be firmly locked on the base plate (1). Photon multipliers and correlators for receiving cross-correlation or auto-correlation functions are also provided.