DEVICE FOR CARRYING OUT OPTICAL MEASUREMENTS IN TURBID MEDIA

摘要

A device for localizing an object (118) in a turbid medium (111), comprising a laser (100) which is used for generating amplitude-modulated light which is conducted into a turbid media (111), and a detection unit (107) for measuring the amplitude-modulated light emanating from the turbid media. A signal processing unit (109) measures a phase and amplitude from the detector signal (115). It appears that the accuracy of the measured phase is influenced by higher harmonics present in the detector signal (115). The accuracy of the phase detection is improved by reducing the higher harmonics in the detector signal (115). This is achieved by reducing the higher harmonics in the amplitude-modulated light from the laser (100) by utilizing a two-mode laser.