| 摘要 |
PROBLEM TO BE SOLVED: To eliminate the effect of a change in the position of a laser ranging means regard; regarding the technique for measuring road surface depression, ground depression, or the like, by using a laser ranging means in a non- contacting manner. SOLUTION: According to this depression measuring method, the target surface of depression measurement is irradiated with laser light obliquely at a prescribed angle, change in the distance to a portion irradiated with the laser light is measured by the use of the laser ranging means by measuring reflected light from the target surface, and the amount of depression of the target surface is measured, based on the change in the distance detected by the ranging means. Each time the amount of depression of the target surface is measured, the position of the ranging means is measured, relative to an immovable point previously set in a non-depression area other than the target surface (step S11) and then the amount of depression of the target surface is measured (step S12).
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