{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,17]],"date-time":"2026-06-17T01:53:53Z","timestamp":1781661233816,"version":"3.54.5"},"reference-count":24,"publisher":"MDPI AG","issue":"15","license":[{"start":{"date-parts":[[2023,8,3]],"date-time":"2023-08-03T00:00:00Z","timestamp":1691020800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"National Natural Science Foundation of China","award":["61973178"],"award-info":[{"award-number":["61973178"]}]},{"name":"National Natural Science Foundation of China","award":["U2066203"],"award-info":[{"award-number":["U2066203"]}]},{"name":"National Natural Science Foundation of China","award":["21KJA470006"],"award-info":[{"award-number":["21KJA470006"]}]},{"name":"National Natural Science Foundation of China","award":["KYCX223347"],"award-info":[{"award-number":["KYCX223347"]}]},{"name":"Smart Grid Joint Fund of State Key Program of National Natural Science Foundation of China","award":["61973178"],"award-info":[{"award-number":["61973178"]}]},{"name":"Smart Grid Joint Fund of State Key Program of National Natural Science Foundation of China","award":["U2066203"],"award-info":[{"award-number":["U2066203"]}]},{"name":"Smart Grid Joint Fund of State Key Program of National Natural Science Foundation of China","award":["21KJA470006"],"award-info":[{"award-number":["21KJA470006"]}]},{"name":"Smart Grid Joint Fund of State Key Program of National Natural Science Foundation of China","award":["KYCX223347"],"award-info":[{"award-number":["KYCX223347"]}]},{"name":"Major natural science projects of colleges and universities in Jiangsu Province","award":["61973178"],"award-info":[{"award-number":["61973178"]}]},{"name":"Major natural science projects of colleges and universities in Jiangsu Province","award":["U2066203"],"award-info":[{"award-number":["U2066203"]}]},{"name":"Major natural science projects of colleges and universities in Jiangsu Province","award":["21KJA470006"],"award-info":[{"award-number":["21KJA470006"]}]},{"name":"Major natural science projects of colleges and universities in Jiangsu Province","award":["KYCX223347"],"award-info":[{"award-number":["KYCX223347"]}]},{"name":"Postgraduate Research &amp; Practice Innovation Program of Jiangsu Province","award":["61973178"],"award-info":[{"award-number":["61973178"]}]},{"name":"Postgraduate Research &amp; Practice Innovation Program of Jiangsu Province","award":["U2066203"],"award-info":[{"award-number":["U2066203"]}]},{"name":"Postgraduate Research &amp; Practice Innovation Program of Jiangsu Province","award":["21KJA470006"],"award-info":[{"award-number":["21KJA470006"]}]},{"name":"Postgraduate Research &amp; Practice Innovation Program of Jiangsu Province","award":["KYCX223347"],"award-info":[{"award-number":["KYCX223347"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Aiming at the problems of lateral force interference and non-uniform strain of robot fingers in the process of pressure tactile sensing, a flexible tactile sensor with a square hole structure based on fiber Bragg grating (FBG) is proposed in this paper. Firstly, the optimal embedding depth of the FBG in the sensor matrix model was determined by finite element simulation. Secondly, according to the size of the finger knuckle and the simulation analysis based on the pressure tactile sensor element for the robot finger, the square hole structure was designed, and the overall dimensions of the sensing element and size of the square hole were determined. Thirdly, the FBG was embedded in the polydimethylsiloxane (PDMS) elastic matrix to make a sensor model, and the tactile sensor was fabricated. Finally, the FBG pressure tactile sensing system platform was built by using optical fiber sensing technology, and the experiment of the FBG tactile sensor was completed through the sensing system platform. Experimental results show that the tactile sensor designed in this paper has good repeatability and creep resistance. The sensitivity is 8.85 pm\/N, and the resolution is 0.2 N. The loading sensitivity based on the robot finger is 27.3 pm\/N, the goodness of fit is 0.996, and the average value of interference in the sensing process is 7.63%, which is lower than the solid structure sensor. These results verify that the sensor can effectively reduce the lateral force interference and solve the problem of non-uniform strain and has high fit with fingers, which has a certain application value for the research of robot pressure tactile intelligent perception.<\/jats:p>","DOI":"10.3390\/s23156897","type":"journal-article","created":{"date-parts":[[2023,8,3]],"date-time":"2023-08-03T11:23:03Z","timestamp":1691061783000},"page":"6897","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["Research on Finger Pressure Tactile Sensor with Square Hole Structure Based on Fiber Bragg Grating"],"prefix":"10.3390","volume":"23","author":[{"given":"Guan","family":"Lu","sequence":"first","affiliation":[{"name":"School of Mechanical Engineering, Nantong University, Nantong 226019, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shiwen","family":"Fu","sequence":"additional","affiliation":[{"name":"School of Mechanical Engineering, Nantong University, Nantong 226019, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tianyu","family":"Zhu","sequence":"additional","affiliation":[{"name":"School of Mechanical Engineering, Nantong University, Nantong 226019, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2264-9153","authenticated-orcid":false,"given":"Yiming","family":"Xu","sequence":"additional","affiliation":[{"name":"School of Electrical Engineering, Nantong University, Nantong 226019, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,8,3]]},"reference":[{"key":"ref_1","unstructured":"Wang, F., Feng, Y., and Zhang, H. (2018). Research progress of fiber Bragg grating tactile sensor. Transducer Microsyst. Technol., 37."},{"key":"ref_2","unstructured":"Wo, H. (2019). Design and Preparation of Capacitive Three-Dimensional Force Flexible Tactile Sensor, Zhejiang University."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"163062","DOI":"10.1016\/j.ijleo.2019.163062","article-title":"Fiber Bragg grating tactile sensor for imaging","volume":"198","author":"Samuel","year":"2019","journal-title":"Optik"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"8825019","DOI":"10.1155\/2021\/8825019","article-title":"Three-Dimensional Force Prediction of a Flexible Tactile Sensor Based on Radial Basis Function Neural Networks","volume":"2021","author":"Wang","year":"2021","journal-title":"J. Sens."},{"key":"ref_5","first-page":"1122","article-title":"Embedded Fiber Sensors to Monitor Temperature and Strain of Polymeric Parts Fabricated by Additive Manufacturing and Reinforced with NiTi Wires","volume":"20","author":"Micael","year":"2020","journal-title":"Senors"},{"key":"ref_6","doi-asserted-by":"crossref","unstructured":"Vijay, K., Cui, X., and Hakil, K. (2021). Vision-Based Tactile Sensor Mechanism for the Estimation of Contact Position and Force Distribution Using Deep Learning. Sensors, 21.","DOI":"10.3390\/s21051920"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"308","DOI":"10.1080\/01691864.2020.1860817","article-title":"A soft tactile sensor featuring subcutaneous tissue structure with collagen fibers","volume":"35","author":"Sonoi","year":"2021","journal-title":"Adv. Robot."},{"key":"ref_8","doi-asserted-by":"crossref","unstructured":"Markowski, K., Kacper, W., Pokropek, E., and Marzecki, M. (2020). Numerical and Experimental Performance Analysis of the Chirped Fiber Bragg Grating Based Abrasion Sensor for the Maintenance Applications in the Industry 4.0. Sensors, 20.","DOI":"10.3390\/s20030770"},{"key":"ref_9","first-page":"509","article-title":"Research on shape sensing fiber optic sensing method of bionic flexible antenna","volume":"48","author":"Zhao","year":"2018","journal-title":"Laser Infrared"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"143","DOI":"10.1016\/j.sna.2019.01.018","article-title":"Slip and roughness detection of robotic fingertip based on FBG","volume":"287","author":"Feng","year":"2019","journal-title":"Sens. Actuactors A Phys."},{"key":"ref_11","unstructured":"Yu, Z. (2017). Research on Fiber Optioc Pressure Tactile Sensor of Robot Finger, Shan Dong University."},{"key":"ref_12","unstructured":"Xu, H., Miao, X., and Wang, S. (2018). Robot flexible tactile sensor based on FBG. Robot, 40."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"8727","DOI":"10.1109\/JSEN.2019.2923046","article-title":"Optical Fiber Anemometer Based on a Multi-FBG Curvature Sensor","volume":"19","author":"Fujiwara","year":"2019","journal-title":"IEEE Sens. J."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"663","DOI":"10.1016\/j.sna.2019.06.048","article-title":"A new Fiber Bragg Grating sensor based circumferential strain sensor fabricated using 3D printing method","volume":"295","author":"Yang","year":"2019","journal-title":"Sens. Actuators A-Phys."},{"key":"ref_15","unstructured":"Hao, H. (2012). Research on Optical Fiber Type Tactile Sensor. [Master\u2019s Thesis, Dalian University of Technology]."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"367194","DOI":"10.1155\/2015\/367194","article-title":"Feedforward neural network for force coding of an MRI-compatible tactile sensor array based on fiber Bragg grating","volume":"2015","author":"Saccomandi","year":"2015","journal-title":"J. Sens."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"11013","DOI":"10.1088\/1748-0221\/13\/11\/P11013","article-title":"Fiber Bragg grating-based biomimetic whisker for shape and texture recognition","volume":"13","author":"Jiang","year":"2018","journal-title":"J. Instrum."},{"key":"ref_18","first-page":"604","article-title":"Flexible tactile sensor with 2D structure based on Fiber Bragg grating","volume":"12057","author":"Qi","year":"2021","journal-title":"Proc. SPIE-Int. Soc. Opt. Eng."},{"key":"ref_19","first-page":"206","article-title":"Research on material recognition function of fiber Bragg grating flexible tactile sensor","volume":"43","author":"Qian","year":"2022","journal-title":"Chin. J. Sci. Instrum."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"084010","DOI":"10.1088\/1361-6501\/acd4d7","article-title":"Optical fiber Bragg grating based sensing system of flexible wearable smart sleeve for tracking human arm joint movements","volume":"34","author":"Feng","year":"2023","journal-title":"Meas. Sci. Technol."},{"key":"ref_21","unstructured":"Heo, J., and Lee, J. (December, January 29). Development of flexible force sensors using fiber Bragg grating for tactile and its evaluation. Proceedings of the Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics, Singapore."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"2048","DOI":"10.1109\/JSEN.2017.2664984","article-title":"Design and Experimental Research on Small-Structures of Tactile Sensor Array Unit Based on Fiber Bragg Grating","volume":"17","author":"Qi","year":"2017","journal-title":"IEEE Sens. J."},{"key":"ref_23","first-page":"44","article-title":"Research on decoupling of fiber Bragg grating tactile signal based on neural network","volume":"42","author":"Qian","year":"2021","journal-title":"Chin. J. Sci. Instrum."},{"key":"ref_24","unstructured":"Liu, H. (2012). Application Research of Fiber Grating Sensor in Structural Health Monitoring. [Ph.D. Thesis, Nanjing University of Aeronautics and Astronautics]."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/23\/15\/6897\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T20:25:03Z","timestamp":1760127903000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/23\/15\/6897"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2023,8,3]]},"references-count":24,"journal-issue":{"issue":"15","published-online":{"date-parts":[[2023,8]]}},"alternative-id":["s23156897"],"URL":"https:\/\/doi.org\/10.3390\/s23156897","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2023,8,3]]}}}