Patent ID: 8982332
Filing Date: 2015-03-17
Classification: G01B,G01S

Abstract:
1. A device, comprising: a first CW laser oscillator that oscillates a first CW laser; a second CW laser oscillator that oscillates a second CW laser, where a frequency of the second CW laser is different than a frequency of the first CW laser; a third CW laser coupled from the first and second CW lasers; an optical comb oscillator; a first circuit that extracts a first pair of beats from a reference CW laser and light from the optical comb oscillator and obtains a second pair of beats from the first pair of beats, wherein the reference CW laser is divided from the third CW laser; a second circuit that extracts a third pair of beats from a detected CW laser and the light from the optical comb oscillator and obtains a fourth pair of beats from the third pair of beats, wherein the detected CW laser is divided from the third CW laser and reflected from an object; a processor that calculates a phase difference between a phase of one of the second pair of beats and a phase of one of the fourth pair of beats.