| 摘要 |
PROBLEM TO BE SOLVED: To achieve a precise distance measurement of a long distance.SOLUTION: The distance measurement device is configured to: calculate an approximate reciprocation distance L' to and from a distance measurement object 100 from a time &Dgr;t required until a pulse laser beam irradiated from a laser beam soure 11 is received by a second optical detector 24 by being reflected with the distance measurement object; identify a wavelength n in a reciprocation optical path until a high frequency laser beam irradiated from the laser beam source 11 is received by the second optical detector by being reflected with the distance measurement object on the basis of the calculated approximate reciprocation distance L'; identify a phase difference Φ of the high frequency laser beam caused by the reciprocation optical path; and calculate a distance to the distance measurement object from the identified wavelength n and the identified phase difference Φ. |
