IJAT Vol.18 No.1 pp. 66-76
doi: 10.20965/ijat.2024.p0066

Research Paper:

Measurement of a Freeform Surface by Dragging Three Point Method Along with a Circular Path

Kento Tokuchi*,†, Mikio Kurita*,**, and Keisuke Takahashi**

*Department of Astronomy, Faculty of Science, Kyoto University
Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto, Kyoto 606-8502, Japan

Corresponding author

**LogistLab Inc.
Tokyo, Japan

July 14, 2023
December 14, 2023
January 5, 2024
freeform, measurement, dragging three-point method, circular path, telescope

Freeform surfaces can realize optical systems with a wide field of view, high throughput, and high contrast. For constructing optical systems with freeform surfaces, measuring technology is essential. However, it is difficult to measure freeform surfaces by existing measurement methods. We have developed a new measurement method of the dragging three-point method (DTPM). To realize further improvement in the accuracy of the DTPM, we propose the DTPM with a circular path. Since the circular path is closed, the measurement error can be reduced by the boundary condition that the height and slope agree with at the start and end points of the measurement. To evaluate this method, we conducted the circular path measurement of an off-axis asphere. The measurement repeatability was RMS = 1.5 nm, and the result agreed well with that of an interferometric test; the difference was RMS = 17.2 nm.

Cite this article as:
K. Tokuchi, M. Kurita, and K. Takahashi, “Measurement of a Freeform Surface by Dragging Three Point Method Along with a Circular Path,” Int. J. Automation Technol., Vol.18 No.1, pp. 66-76, 2024.
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Last updated on Feb. 19, 2024