{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,3]],"date-time":"2026-05-03T08:06:51Z","timestamp":1777795611108,"version":"3.51.4"},"reference-count":28,"publisher":"MDPI AG","issue":"16","license":[{"start":{"date-parts":[[2019,8,18]],"date-time":"2019-08-18T00:00:00Z","timestamp":1566086400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100010877","name":"Shenzhen Science and Technology Innovation Commission","doi-asserted-by":"publisher","award":["No. JCYJ20170817160808432"],"award-info":[{"award-number":["No. JCYJ20170817160808432"]}],"id":[{"id":"10.13039\/501100010877","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003453","name":"Natural Science Foundation of Guangdong Province","doi-asserted-by":"publisher","award":["2018A030313748"],"award-info":[{"award-number":["2018A030313748"]}],"id":[{"id":"10.13039\/501100003453","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["No. 51427805"],"award-info":[{"award-number":["No. 51427805"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Youth Funding of Shenzhen Graduate of Tsinghua University","award":["No. QN20180003"],"award-info":[{"award-number":["No. QN20180003"]}]},{"DOI":"10.13039\/501100012166","name":"National Key Research and Development Program","doi-asserted-by":"publisher","award":["No. 2016YFF0100704"],"award-info":[{"award-number":["No. 2016YFF0100704"]}],"id":[{"id":"10.13039\/501100012166","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Chromatic confocal technology (CCT) is one of the most promising methods for the contactless and accurate measurement of structure profiles. Based on the principles of chromatic dispersion and confocal theory, a dispersion probe is proposed and optimized with several commercial and cheap refractive index lenses. The probe provides 0.3\u00d7 magnification and a dispersion range of 400 \u03bcm with a commercial LED source with an effective bandwidth of ca. 450\u2013623 nm. Since the noise fluctuation can affect the extraction stability of the focal wavelength, a modification to the centroid peak extraction algorithm is proposed in this paper, where several virtual pixels are interpolated among the real pixels of the spectrometer before thresholding. In addition, a series of experiments were carried out to test the system\u2019s displacement measurement performance. The results clearly show that stability is improved by the modified algorithm, and the calibration repeatability is \u00b10.3 \u03bcm in the full measurement range with a linear stage. The standard deviation at the fixed position has an optimal value of 0.009 \u03bcm. The section profile of a Fresnel lens is measured by the CCT system to demonstrate its high feasibility and efficiency.<\/jats:p>","DOI":"10.3390\/s19163592","type":"journal-article","created":{"date-parts":[[2019,8,19]],"date-time":"2019-08-19T06:10:14Z","timestamp":1566195014000},"page":"3592","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":55,"title":["Chromatic Confocal Displacement Sensor with Optimized Dispersion Probe and Modified Centroid Peak Extraction Algorithm"],"prefix":"10.3390","volume":"19","author":[{"given":"Jiao","family":"Bai","sequence":"first","affiliation":[{"name":"Division of Advanced Manufacturing, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China"},{"name":"Institute of Materials, China Academy of Engineering Physics, Mianyang 621907, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xinghui","family":"Li","sequence":"additional","affiliation":[{"name":"Division of Advanced Manufacturing, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiaohao","family":"Wang","sequence":"additional","affiliation":[{"name":"Division of Advanced Manufacturing, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Qian","family":"Zhou","sequence":"additional","affiliation":[{"name":"Division of Advanced Manufacturing, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kai","family":"Ni","sequence":"additional","affiliation":[{"name":"Division of Advanced Manufacturing, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2019,8,18]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"2163","DOI":"10.1007\/s00170-016-9494-3","article-title":"Non-contact on-machine measurement using a chromatic confocal probe for an ultra-precision turning machine","volume":"90","author":"Zou","year":"2017","journal-title":"Int. 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