We demonstrate tomographic imaging of the refractive index of turbid media using bifocal optical coherence refractometry (BOCR). The technique, which is a variant of optical coherence tomography, is based on the measurement of the optical pathlength difference between two foci simultaneously present in a medium of interest. We describe a new method to axially shift the bifocal optical pathlengt...

Formulation of the problem. Solving problems urban transport communications, in particular constantly growing intensity automobile traffic megalopolises, is one main directions minimizing environmental and man-made risks environment. Global concepts greening large cities pay considerable attention to possibilities underground space take on functions most dangerous risky surface objects since im...