Development of precise on-the-machine measurement system for large optics

2015 Fiscal Year Final Research Report

• Project/Area Number: 25287038
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Astronomy
• Research Institution: Kyoto University
• Principal Investigator: kurita mikio 京都大学, 理学(系)研究科(研究院), 准教授 (20419427)
• Co-Investigator(Kenkyū-buntansha): 木野 勝 京都大学, 理学(系)研究科(研究院), 助教 (40377932)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 精密計測 / データ処理 / 精密加工 / 光赤外線天文学

Outline of Final Research Achievements

Interferometers do not work well for a convex or free form optics which does not have real focal point, and need precise reference surface meet with each test surface and large space for the system. A measurement having a capability of more large and free form testing is required for the optics in future astronomy. We developed a measurement system applying three-probe method, and confirmed its performance with measuring a concave mirror 800 mm in diameter. The result shows the good agreement with a result of Fizeu interferometer.
The method is based on the classical theory of least squares. This method regards serial data as elastic body and integrates individual serial data naturally by solving minimum energy problem. Excellent improvements are performed in data procedure. This method can be executed by conventional numerical algorithm: finite element method (FEM) and has potential to be applied for the various fields and numerous data obtained so far and in future.

Free Research Field

光赤外線天文学