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The core of the spectral confocal measurement system is a dispersive objective lens that uses optical dispersion to establish a one-to-one correspondence between the focusing position and wavelength, achieving high-resolution measurements in the longitudinal direction. Despite significant progress in dispersive objective lenses for spectral confocal sensor systems, challenges such as a limited dispersion range, high cost, and insufficient measurement accuracy persist. To expand the measurement range and improve the accuracy of the spectral confocal sensor, we designed a compact, long-axial dispersion objective lens. This lens has a simple structure that requires only six lens elements, two of which form cemented doublets. The system length is 58 mm, with a working distance of 46 \u00b1 6 mm and a dispersion range of 12 mm within the wavelength range of 450\u2013656 nm. The lens has an object-side numerical aperture (NA) of 0.22 and an image-side NA between 0.198 and 0.24, ensuring high light energy utilization. Finally, a spectral confocal measurement system was constructed based on the designed dispersive objective lens, and performance evaluation tests were conducted. The test results showed that the system achieved a resolution of 0.15 \u03bcm and a maximum linear error of \u00b10.7 \u03bcm, demonstrating high-precision measurement capabilities. The proposed lens design enables the development of more portable and cost-effective spectral confocal sensors.<\/jats:p>","DOI":"10.3390\/s24165122","type":"journal-article","created":{"date-parts":[[2024,8,8]],"date-time":"2024-08-08T07:01:25Z","timestamp":1723100485000},"page":"5122","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Compact Chromatic Confocal Lens with Large Measurement Range"],"prefix":"10.3390","volume":"24","author":[{"given":"Ning","family":"He","sequence":"first","affiliation":[{"name":"Ningbo Research Institute, Zhejiang University, Ningbo 315100, China"},{"name":"College of Optical Science and Engineering, Zhejiang University, Hangzhou 310058, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-6930-5476","authenticated-orcid":false,"given":"Huiqin","family":"Hu","sequence":"additional","affiliation":[{"name":"Ningbo Research Institute, Zhejiang University, Ningbo 315100, China"},{"name":"College of Optical Science and Engineering, Zhejiang University, Hangzhou 310058, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zhiying","family":"Cui","sequence":"additional","affiliation":[{"name":"Ningbo Yongxin Optics Co., Ltd., Ningbo 315048, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xinjun","family":"Xu","sequence":"additional","affiliation":[{"name":"Ningbo Research Institute, Zhejiang University, Ningbo 315100, China"},{"name":"College of Optical Science and Engineering, Zhejiang University, Hangzhou 310058, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dakai","family":"Zhou","sequence":"additional","affiliation":[{"name":"Ningbo Research Institute, Zhejiang University, Ningbo 315100, China"},{"name":"College of Optical Science and Engineering, Zhejiang University, Hangzhou 310058, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yunbo","family":"Chen","sequence":"additional","affiliation":[{"name":"Ningbo Research Institute, Zhejiang University, Ningbo 315100, China"},{"name":"College of Optical Science and Engineering, Zhejiang University, Hangzhou 310058, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Puyin","family":"Gong","sequence":"additional","affiliation":[{"name":"Ningbo Yongxin Optics Co., Ltd., Ningbo 315048, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8766-4605","authenticated-orcid":false,"given":"Youhua","family":"Chen","sequence":"additional","affiliation":[{"name":"Ningbo Research Institute, Zhejiang University, Ningbo 315100, China"},{"name":"College of Optical Science and Engineering, Zhejiang University, Hangzhou 310058, China"},{"name":"Ningbo Yongxin Optics Co., Ltd., Ningbo 315048, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Cuifang","family":"Kuang","sequence":"additional","affiliation":[{"name":"Ningbo Research Institute, Zhejiang University, Ningbo 315100, China"},{"name":"College of Optical Science and Engineering, Zhejiang University, Hangzhou 310058, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2024,8,7]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"5968","DOI":"10.1364\/AO.38.005968","article-title":"Thickness-Profile Measurement of Transparent Thin-Film Layers by White-Light Scanning Interferometry","volume":"38","author":"Kim","year":"1999","journal-title":"Appl. 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