METHOD OF DETECTING REFLECTED LASER RADIATION AND APPARATUS FOR DETECTING REFLECTED LASER RADIATION Russian patent published in 2011 - IPC G02B21/00 

FIELD: physics.

SUBSTANCE: method of detecting reflected laser radiation involves generation of double-mode laser radiation, directing said radiation onto an analysed object and injection of radiation reflected by the analysed object into a laser to form resultant laser radiation. The double-mode laser radiation with frequency values ν₁ and ν₂ is generated with splitting ν₁₂=ν₂-ν₁ in the range from 1 MHz to 50 MHz. The distance D between the laser and the analysed object is modulated by giving it in accordance with the condition D≠(c/2ν₁₂)k, where k is an integer (k=0, 1, 2, 3…), c is light velocity, and characteristics of the analysed object are determined by the resultant laser radiation picked up.

EFFECT: improved method.

5 cl, 1 dwg