Refractive index determining device for part of human or animal body to detect e.g. tumor, has computer to find optical path and to link elementary optical paths and refraction indices to detected travel time, to solve matrix equation

摘要

The device has an infrared laser light (37) movable by one elementary step along a displacement guide (102) or stationary relative to a mirror to perform a series of p coplanar shots. A computer (106) finds an optical path among all optical paths starting from a starting point and reaching an arrival point and links elementary optical paths and refraction indices to detected travel time, to solve a matrix equation. Each shot proceeds from the starting point marked relative to the guide and arrives in the arrival point marked by a detecting unit (40) after passing through a physical environment (44) following an optical path defined as being the shortest optical path between the two points. A timer (104) is synchronized with each shot to record the travel time when each shot reaches the arrival point starting from an initial time when the shot leaves the starting point. The matrix equation is solved relative to a vector of the refractive indices of elementary tiles.