Absolute profile measurement for large scale constrcution using comb self beat distance sensor

2015 Fiscal Year Final Research Report

• Project/Area Number: 26630087
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Intelligent mechanics/Mechanical systems
• Research Institution: The University of Tokyo
• Principal Investigator: Takamasu Kiyoshi 東京大学, 工学(系)研究科(研究院), 教授 (70154896)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: コムレーザー / 距離測定 / 粗面 / 三次元測定 / 大型構造物

Outline of Final Research Achievements

The absolute distance measurement method to rough surface using self-beat signal of the comb laser is proposed. Phase signal of self-beat without cyclic error can be obtained using beat down method by two comb lasers. The absolute profile of a cylinder with rough surface of roughness over 10 µm can be measured with accuracy of several tens µm from the 3 m distant position with measuring wave length of 83 mm. Moreover, the absolute distance over measuring wave length can be decided using coincident method of two measuring frequencies (3.5 GHz and 3.6 GHz).

Free Research Field

精密測定