Instrumentation, Techniques, and Measurement

Scanning dimensional measurement using laser-trapped microsphere with optical standing-wave scale

[+] Author Affiliations
Masaki Michihata, Satoru Takahashi

The University of Tokyo, Research Center for Advanced Science and Technology, Meguro, Tokyo, Japan

Shin-ichi Ueda, Yasuhiro Takaya

Osaka University, Department of Mechanical Engineering, Suita, Osaka, Japan

Kiyoshi Takamasu

The University of Tokyo, Department of Precision Engineering, Bunkyo, Tokyo, Japan

Opt. Eng. 56(6), 064103 (Jun 19, 2017). doi:10.1117/1.OE.56.6.064103
History: Received March 8, 2017; Accepted June 2, 2017
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Abstract.  We propose a laser trapping-based scanning dimensional measurement method for free-form surfaces. We previously developed a laser trapping-based microprobe for three-dimensional coordinate metrology. This probe performs two types of measurements: a tactile coordinate and a scanning measurement in the same coordinate system. The proposed scanning measurement exploits optical interference. A standing-wave field is generated between the laser-trapped microsphere and the measured surface because of the interference from the retroreflected light. The standing-wave field produces an effective length scale, and the trapped microsphere acts as a sensor to read this scale. A horizontal scan of the trapped microsphere produces a phase shift of the standing wave according to the surface topography. This shift can be measured from the change in the microsphere position. The dynamics of the trapped microsphere within the standing-wave field was estimated using a harmonic model, from which the measured surface can be reconstructed. A spherical lens was measured experimentally, yielding a radius of curvature of 2.59 mm, in agreement with the nominal specification (2.60 mm). The difference between the measured points and a spherical fitted curve was 96 nm, which demonstrates the scanning function of the laser trapping-based microprobe for free-form surfaces.

© 2017 Society of Photo-Optical Instrumentation Engineers

Citation

Masaki Michihata ; Shin-ichi Ueda ; Satoru Takahashi ; Kiyoshi Takamasu and Yasuhiro Takaya
"Scanning dimensional measurement using laser-trapped microsphere with optical standing-wave scale", Opt. Eng. 56(6), 064103 (Jun 19, 2017). ; http://dx.doi.org/10.1117/1.OE.56.6.064103


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