Device for determining a refractive index in a large number...

Details Device for determining a refractive index in a large number... Device for determining a refractive index in a large number...

2006-12-14

2008-12-02

Punnoose, Roy M (Department: 2886)

Optics: measuring and testing

Refraction testing

C356S131000

Reexamination Certificate

active

07460217

ABSTRACT:
A device for determining a refractive index (Rl) in a large number of points of a physical medium, comprising: a light laser for performing a series of p pulsed laser rays (PLRs) each proceeding from a starting point Ap and arriving in an arrival point Bp following the shortest optical path between the two points Ap and Bp; a timer to record a time Tp when each PLR reaches the arrival point Bp; and a computer programmed for finding the shortest optical path among all the optical paths starting from the starting point Ap and all reaching the arrival point Bp, and from p linear equations linking elementary optical paths (L) and the refraction indices (N) to the detected travel time Tp, for solving the matrix equation [N]*[L]=[T] relative to a vector of the refractive indices [N] and repeating until [L] and [N] converge.

REFERENCES:
patent: 4792227 (1988-12-01), Yoshizawa
patent: 5588032 (1996-12-01), Johnson
patent: 5633708 (1997-05-01), Svendsen
patent: WO03042670 (2003-05-01), None

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