Automatic Alignment of Optical System Using Shape Memory Alloy |
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| Authors: | Minoru Sasaki Yuji Arai Kazuhiro Hane |
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| Institution: | (1) Department of Mechatronics and Precision Engineering, Tohoku University, Sendai 980-77, Japan |
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| Abstract: | Properties of the shape memory alloy of 29 μm thick Ni-Ti foil are investigated as an actuator to align optical elements. Since the intrinsic properties of the Ni-Ti foil are not satisfactory in reproducibility and hysteresis, a simple feedback control is used. A pinhole integrated with a surrounding position sensor is proposed to realize a confocal optical system having an automatic alignment function. Large displacement (mm) and precision at the level of the optical wavelength are found to be possible.Present at 1996 International Workshop on Interferometry (IWI ‘96), August 27-29, Saitama, Japan. |
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| Keywords: | shape memory alloy Ni-Ti two way shape memory effect alignment pinhole photodetector feedback control |
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