{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T01:43:35Z","timestamp":1760233415019,"version":"build-2065373602"},"reference-count":26,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2021,1,14]],"date-time":"2021-01-14T00:00:00Z","timestamp":1610582400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100012166","name":"National Key Research and Development Program of China","doi-asserted-by":"publisher","award":["2017YFA0701200"],"award-info":[{"award-number":["2017YFA0701200"]}],"id":[{"id":"10.13039\/501100012166","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100013287","name":"Science Challenge Program","doi-asserted-by":"publisher","award":["TZ2018006-0203-01"],"award-info":[{"award-number":["TZ2018006-0203-01"]}],"id":[{"id":"10.13039\/501100013287","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Tianjin Natural Science Foundation of China","award":["19JCZDJC39100"],"award-info":[{"award-number":["19JCZDJC39100"]}]},{"name":"Postdoctoral Innovative Talent Support Program of China","award":["BX20190230"],"award-info":[{"award-number":["BX20190230"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Profile measurement is a key technical enabler in the manufacturing of highly curved freeform surfaces due to their complex geometrical shape. A current optical probe was used to measure nearly rotary freeform surfaces with the help of one rotation axis, because the probe needs to measure along the normal vector of the surface under the limitation of the numerical aperture (NA). This kind of measuring system generally has a high cost due to the high-precision, multi-axis platform. In this paper, we propose a low-cost, dual-axis rotation scanning method for a highly curved freeform surface with an arbitrary shape. The optical probe can scan the surface profile while always keeping consistent with the normal vector of the measuring points with the help of the double rotation axis. This method can adapt to the changes in curvature in any direction for a highly curved freeform surface. In addition, the proposed method provides a system error calibration technique for the rotation axis errors. This technique can be used to avoid the dependence of the measuring system on the high-precision platform. The three key system errors that affect the measurement accuracy such as installation error of the B-axis, A-axis, and XZ perpendicularity error are first analyzed through establishing an error model. Then, the real error values are obtained by the optimal calculation in the calibration process. Finally, the feasibility of the measurement method is verified by measuring one cone mirror and an F-theta mirror and comparing the results to those obtained using commercial equipment. The maximum measurable angle of the system is \u00b190\u00b0, the maximum measurable diameter is 100 mm, and the measurement accuracy of the system reaches the micron level in this paper.<\/jats:p>","DOI":"10.3390\/s21020554","type":"journal-article","created":{"date-parts":[[2021,1,15]],"date-time":"2021-01-15T01:33:29Z","timestamp":1610674409000},"page":"554","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Modeling and Analysis of System Error for Highly Curved Freeform Surface Measurement by Noncontact Dual-Axis Rotary Scanning"],"prefix":"10.3390","volume":"21","author":[{"given":"Li","family":"Miao","sequence":"first","affiliation":[{"name":"State Key Laboratory of Precision Measuring Technology &amp; Instruments, Laboratory of Micro\/Nano Manufacturing Technology, Tianjin University, Tianjin 300072, China"}]},{"given":"Linlin","family":"Zhu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Precision Measuring Technology &amp; Instruments, Laboratory of Micro\/Nano Manufacturing Technology, Tianjin University, Tianjin 300072, China"}]},{"given":"Changshuai","family":"Fang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Precision Measuring Technology &amp; Instruments, Laboratory of Micro\/Nano Manufacturing Technology, Tianjin University, Tianjin 300072, China"}]},{"given":"Ning","family":"Yan","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Precision Measuring Technology &amp; Instruments, Laboratory of Micro\/Nano Manufacturing Technology, Tianjin University, Tianjin 300072, China"}]},{"given":"Xudong","family":"Yang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Precision Measuring Technology &amp; Instruments, Laboratory of Micro\/Nano Manufacturing Technology, Tianjin University, Tianjin 300072, China"}]},{"given":"Xiaodong","family":"Zhang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Precision Measuring Technology &amp; Instruments, Laboratory of Micro\/Nano Manufacturing Technology, Tianjin University, Tianjin 300072, China"}]}],"member":"1968","published-online":{"date-parts":[[2021,1,14]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1843","DOI":"10.1364\/AO.51.001843","article-title":"Design and fabrication of a freeform microlensarray for a compact large-field-of-view compound-eye camera","volume":"51","author":"Li","year":"2012","journal-title":"Appl. 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