{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,20]],"date-time":"2025-11-20T06:05:13Z","timestamp":1763618713572,"version":"3.45.0"},"reference-count":28,"publisher":"MDPI AG","issue":"22","license":[{"start":{"date-parts":[[2025,11,17]],"date-time":"2025-11-17T00:00:00Z","timestamp":1763337600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100004837","name":"Spanish Ministry of Science and Innovation","doi-asserted-by":"crossref","award":["PID2021-122505OB-C32","PID2024-155582OB-C32"],"award-info":[{"award-number":["PID2021-122505OB-C32","PID2024-155582OB-C32"]}],"id":[{"id":"10.13039\/501100004837","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>This article presents a model for analyzing the effect of misalignments in the optical power gathered by a single-color fiber-optic off-axis pyrometer when there is a tilting angle between the longitudinal fiber axis and the plane of the emitted surface. The model takes into account the fiber parameters, such as the diameter and the numerical aperture, as well as the target object size and measuring distance. Simulations show the simultaneous influence of tilting angle and lateral displacement. This provides key behavioral insights to guide alignment and calibration, helping to avoid temperature measurement errors in advanced manufacturing. The model allows integration of the emissivity angle dependence. Results show that the influence of lateral misalignment is negligible for values below 15 \u00b5m (which is 1\/10 of the 150 \u00b5m minimum distance) when considering a 160 \u00b5m object size and a 60\u00b0 tilting angle. The displacement influence, for a fixed tilting angle, is higher in specific directions of displacement.<\/jats:p>","DOI":"10.3390\/s25227011","type":"journal-article","created":{"date-parts":[[2025,11,19]],"date-time":"2025-11-19T11:17:27Z","timestamp":1763551047000},"page":"7011","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Misalignment Effects on Power Gathered by Optical Fiber Pyrometer"],"prefix":"10.3390","volume":"25","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4148-1720","authenticated-orcid":false,"given":"Salvador","family":"Vargas","sequence":"first","affiliation":[{"name":"Electrical Engineering Faculty, Universidad Tecnol\u00f3gica de Panam\u00e1, Ave. Universidad Tecnol\u00f3gica, El Dorado, Panam\u00e1 0819-07289, Panama"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2138-3130","authenticated-orcid":false,"given":"Alberto","family":"Tapetado","sequence":"additional","affiliation":[{"name":"Electronics Technology Department, Universidad Carlos III de Madrid, 28911 Legan\u00e9s, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4895-0913","authenticated-orcid":false,"given":"Carmen","family":"V\u00e1zquez","sequence":"additional","affiliation":[{"name":"Electronics Technology Department, Universidad Carlos III de Madrid, 28911 Legan\u00e9s, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2025,11,17]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"118744","DOI":"10.1016\/j.jmatprotec.2025.118744","article-title":"Review of grinding temperature theory and measurement for the needs of the times: Promoting the development of advanced manufacturing","volume":"337","author":"Zhao","year":"2025","journal-title":"J. Mater. Process. Technol."},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Mitra\u0161inovi\u0107, A., \u0110ur\u0111evi\u0107, T., Ne\u0161kovi\u0107, J., and Radosavljevi\u0107, M. (2025). Temperature Monitoring in Metal Additive Manufacturing in the Era of Industry 4.0. Technologies, 13.","DOI":"10.3390\/technologies13080317"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"3261","DOI":"10.1109\/TIA.2020.2980478","article-title":"High-Speed Temperature Monitoring for Steel Strips Using Infrared Line Scanners","volume":"56","author":"Usamentiaga","year":"2020","journal-title":"IEEE Trans. Ind. Appl."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"1380","DOI":"10.1109\/JLT.2015.2513158","article-title":"Two-Color Pyrometer for Process Temperature Measurement During Machining","volume":"34","author":"Tapetado","year":"2016","journal-title":"J. Lightw. Technol."},{"key":"ref_5","first-page":"93","article-title":"Submicrometer Resolution Hyperspectral Quantum Rod Thermal Imaging of Microelectronic Devices","volume":"2","author":"Pomeroy","year":"2019","journal-title":"ACS Appl. Electron. Mater."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"1768","DOI":"10.1109\/TIM.2010.2089894","article-title":"Temperature Measurement Using the Wedge Method: Comparison and Application to Emissivity Estimation and Compensation","volume":"60","author":"Usamentiaga","year":"2011","journal-title":"IEEE Trans. Instrum. Meas."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"128818","DOI":"10.1016\/j.surfcoat.2022.128818","article-title":"Investigation of IR pyrometer-captured thermal signatures and their role on microstructural evolution and properties of Inconel 625 tracks in DED-based additive manufacturing","volume":"447","author":"Misra","year":"2022","journal-title":"Surf. Coat. Technol."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"1407","DOI":"10.1007\/s10845-023-02119-y","article-title":"Process monitoring and machine learning for defect detection in laser-based metal additive manufacturing","volume":"35","author":"Herzog","year":"2024","journal-title":"J. Intell. Manuf."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"111147","DOI":"10.1016\/j.measurement.2022.111147","article-title":"A sub-nanosecond pyrometer with broadband spectral channels for temperature measurement of dynamic compression experiments","volume":"195","author":"Wu","year":"2022","journal-title":"Measurement"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"98","DOI":"10.1007\/s40516-025-00279-8","article-title":"Correcting the Influence of the Angle-Dependent Emissivity on Pyrometric Temperature Measurements for Laser Processes","volume":"12","author":"Traunecker","year":"2025","journal-title":"Lasers Manuf. Mater. Process."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"585","DOI":"10.1029\/2018JE005840","article-title":"Modeling the angular dependence of emissivity of randomly rough surfaces","volume":"124","author":"Warren","year":"2019","journal-title":"J. Geophys. Res. Planets"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"2942","DOI":"10.1109\/JSEN.2020.3022179","article-title":"High spatial resolution optical fiber two colour pyrometer with fast response","volume":"21","author":"Tapetado","year":"2021","journal-title":"IEEE Sens. J."},{"key":"ref_13","doi-asserted-by":"crossref","unstructured":"N\u00fa\u00f1ez-Cascajero, A., Tapetado, A., Vargas, S., and V\u00e1zquez, C. (2021). Optical Fiber Pyrometer Designs for Temperature Measurements Depending on Object Size. Sensors, 21.","DOI":"10.3390\/s21020646"},{"key":"ref_14","doi-asserted-by":"crossref","unstructured":"Safarloo, S., Tapetado, A., and V\u00e1zquez, C. (2023). Experimental Validation of High Spatial Resolution of Two-Color Optical Fiber Pyrometer. Sensors, 23.","DOI":"10.3390\/s23094320"},{"key":"ref_15","doi-asserted-by":"crossref","unstructured":"Vargas, S., Tapetado, A., and V\u00e1zquez, C. (2023). Influence of Tilting Angle on Temperature Measurements of Different Object Sizes Using Fiber-Optic Pyrometers. Sensors, 23.","DOI":"10.3390\/s23198119"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"e2020GL091856","DOI":"10.1029\/2020GL091856","article-title":"Fast and Localized Temperature Measurements During Simulated Earthquakes in Carbonate Rocks","volume":"48","author":"Aretusini","year":"2021","journal-title":"Geophys. Res. Lett."},{"key":"ref_17","doi-asserted-by":"crossref","unstructured":"Aydogan, B., and Chou, K. (2024). Review of In Situ Detection and Ex Situ Characterization of Porosity in Laser Powder Bed Fusion Metal Additive Manufacturing. Metals, 14.","DOI":"10.3390\/met14060669"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"117751","DOI":"10.1016\/j.jmatprotec.2022.117751","article-title":"Cutting temperature measurement using a novel near-infrared two-color pyrometer under dry and wet cutting of Ti-6Al-4V alloy","volume":"309","author":"Li","year":"2022","journal-title":"J. Mater. Process. Technol."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"96","DOI":"10.1016\/j.procir.2017.12.029","article-title":"Temperature Measurement of Wire Electrode in Wire EDM by Two-color Pyrometer","volume":"68","author":"Koyano","year":"2018","journal-title":"Procedia CIRP"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"991","DOI":"10.1364\/AO.22.000991","article-title":"Transmission loss caused by an angular misalignment between two multimode fibers with arbitrary profile exponents","volume":"22","author":"Opielka","year":"1983","journal-title":"Appl. Opt."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"231","DOI":"10.1002\/mop.20427","article-title":"Power coupling between two step-index multimode fibers of different numerical apertures with an angular misalignment","volume":"43","author":"Gao","year":"2004","journal-title":"Microw. Opt. Technol. Lett."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"2505","DOI":"10.1109\/JLT.2021.3051458","article-title":"Launch Light Design for Coupling Loss Measurement of Step-Index Multimode Fiber Connections","volume":"39","author":"Horiguchi","year":"2021","journal-title":"J. Lightw. Technol."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"130575","DOI":"10.1016\/j.optcom.2024.130575","article-title":"Large Core Multimode Fiber with High Tolerance to Coupling Misalignment and Dust Contamination in Intra-Vehicle Networks","volume":"564","author":"Ma","year":"2024","journal-title":"Opt. Commun."},{"key":"ref_24","doi-asserted-by":"crossref","unstructured":"Kam, W., Ong, Y.S., O\u2019Keeffe, S., Mohammed, W.S., and Lewis, E. (2019). An Analytical Model for Describing the Power Coupling Ratio between Multimode Fibers with Transverse Displacement and Angular Misalignment in an Optical Fiber Bend Sensor. Sensors, 19.","DOI":"10.3390\/s19224968"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"409","DOI":"10.1038\/s42005-025-02323-7","article-title":"Efficient Dynamic Free-Space-to-Fiber Coupling of Cylindrical Vector Beams via Twisted Moir\u00e9 Meta-Devices","volume":"8","author":"Liu","year":"2025","journal-title":"Commun. Phys."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"7551","DOI":"10.1109\/JLT.2025.3575727","article-title":"Demonstration of Simultaneous Mitigation of Turbulence and Misalignment in a Free-Space Mode-Division-Multiplexed Optical Link Using Beam Shaping","volume":"43","author":"Ramakrishnan","year":"2025","journal-title":"J. Lightw. Technol."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"109","DOI":"10.12913\/22998624\/209176","article-title":"Production of spherical Inconel 625 powder for additive manufacturing by plasma-arc wire atomization: Influence of non-transferred and transferred arc modes on fine powder yield","volume":"19","author":"Korzhyk","year":"2025","journal-title":"Adv. Sci. Technol. Res. J."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"6409","DOI":"10.1109\/JLT.2024.3438108","article-title":"Single-Mode Sapphire Fiber Temperature Sensor","volume":"42","author":"Wang","year":"2024","journal-title":"J. Lightw. Technol."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/25\/22\/7011\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,11,20]],"date-time":"2025-11-20T05:22:42Z","timestamp":1763616162000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/25\/22\/7011"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,11,17]]},"references-count":28,"journal-issue":{"issue":"22","published-online":{"date-parts":[[2025,11]]}},"alternative-id":["s25227011"],"URL":"https:\/\/doi.org\/10.3390\/s25227011","relation":{},"ISSN":["1424-8220"],"issn-type":[{"type":"electronic","value":"1424-8220"}],"subject":[],"published":{"date-parts":[[2025,11,17]]}}}