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Design and Testing of a Compact Optical Angle Sensor for Pitch Deviation Measurement of a Scale Grating with a Small Angle of Diffraction
Tohoku Univ, Dept Finemech, 6-6-01 Aramaki Aza Aoba,Aoba ku, Sendai, Miyagi 9808579, Japan..
Hokkaido Univ, Div Mech & Space Engn, Sapporo, Japan..
Tohoku Univ, Dept Finemech, 6-6-01 Aramaki Aza Aoba,Aoba ku, Sendai, Miyagi 9808579, Japan..
Tohoku Univ, Dept Finemech, 6-6-01 Aramaki Aza Aoba,Aoba ku, Sendai, Miyagi 9808579, Japan..
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2022 (English)In: International Journal of Automation Technology, ISSN 1881-7629, E-ISSN 1883-8022, Vol. 16, no 5, p. 572-581Article in journal (Refereed) Published
Abstract [en]

The design and testing of different optical heads were performed to evaluate the pitch deviation of a diffrac-tion scale grating with a small diffraction angle. Based on the proposed pitch deviation evaluation method employing optical angle sensors based on laser au-tocollimation, a modified optical head with position -sensitive detectors (PSDs) is first designed and con-structed by following the conventional optical config-uration. Owing to the small angle of diffraction of the first-order diffracted beams, the modified optical head has a large working distance, resulting in poor sensor stability. Therefore, a novel and compact optical head employing a pair of small prisms is designed and de-veloped to shorten the working distance of the opti-cal head. An additional modification was also made to the developed compact optical head in such a way that collimator objectives (COs) in the laser autocollima-tion units are removed to improve the sensor sensitiv-ity. Experimental comparisons were conducted using the three types of optical heads to verify the feasibility of the developed optical angle sensor with PSDs.

Place, publisher, year, edition, pages
Fuji Technology Press Ltd. , 2022. Vol. 16, no 5, p. 572-581
Keywords [en]
diffraction grating, optical head, laser auto-collimation, pitch deviation
National Category
Telecommunications
Identifiers
URN: urn:nbn:se:kth:diva-320509DOI: 10.20965/ijat.2022.p0572ISI: 000863313100008Scopus ID: 2-s2.0-85137555754OAI: oai:DiVA.org:kth-320509DiVA, id: diva2:1705566
Note

QC 20221024

Available from: 2022-10-24 Created: 2022-10-24 Last updated: 2022-10-24Bibliographically approved

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Archenti, Andreas

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