{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,20]],"date-time":"2026-03-20T12:52:45Z","timestamp":1774011165761,"version":"3.50.1"},"reference-count":14,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2014,4,14]],"date-time":"2014-04-14T00:00:00Z","timestamp":1397433600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Fibers"],"abstract":"<jats:p>An ultra-high sensitive strain sensor is proposed. The sensing head, based on the post-processing of a fiber Bragg grating, is used to perform passive and active strain measurements. Both wavelength and full width half maximum dependences with the applied strain are studied for the passive sensor, where maximum sensitivities of 104.1 pm\/\u00b5\u03b5  and 61.6 pm\/\u00b5\u03b5 are respectively obtained. When combining the high performance of this sensor with a ring laser cavity configuration, the Bragg grating will act as a filter and  high resolution measurements can be performed. With the proposed sensor, a resolution  of 700 n\u03b5 is achieved.<\/jats:p>","DOI":"10.3390\/fib2020142","type":"journal-article","created":{"date-parts":[[2014,4,14]],"date-time":"2014-04-14T12:54:41Z","timestamp":1397480081000},"page":"142-149","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["Ultra-High Sensitive Strain Sensor Based on Post-Processed Optical Fiber Bragg Grating"],"prefix":"10.3390","volume":"2","author":[{"given":"Marta","family":"Ferreira","sequence":"first","affiliation":[{"name":"INESC Porto, Rua do Campo Alegre, 687, Porto 4169-007, Portugal"},{"name":"Faculdade de Ci\u00eancias da Universidade do Porto, Rua do Campo Alegre, 687, Porto 4169-007, Portugal"}]},{"given":"J\u00f6rg","family":"Bierlich","sequence":"additional","affiliation":[{"name":"IPHT Jena, Institute of Photonic Technology, Albert-Einstein-Str. 9, Jena 07745, Germany"}]},{"given":"Martin","family":"Becker","sequence":"additional","affiliation":[{"name":"IPHT Jena, Institute of Photonic Technology, Albert-Einstein-Str. 9, Jena 07745, Germany"}]},{"given":"Kay","family":"Schuster","sequence":"additional","affiliation":[{"name":"IPHT Jena, Institute of Photonic Technology, Albert-Einstein-Str. 9, Jena 07745, Germany"}]},{"given":"Jos\u00e9","family":"Santos","sequence":"additional","affiliation":[{"name":"INESC Porto, Rua do Campo Alegre, 687, Porto 4169-007, Portugal"},{"name":"Faculdade de Ci\u00eancias da Universidade do Porto, Rua do Campo Alegre, 687, Porto 4169-007, Portugal"}]},{"given":"Orlando","family":"Fraz\u00e3o","sequence":"additional","affiliation":[{"name":"INESC Porto, Rua do Campo Alegre, 687, Porto 4169-007, Portugal"},{"name":"Faculdade de Ci\u00eancias da Universidade do Porto, Rua do Campo Alegre, 687, Porto 4169-007, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2014,4,14]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1258","DOI":"10.1109\/LPT.2006.875520","article-title":"Compact modal interferometer built with tapered microstructured optical fiber","volume":"18","author":"Villatoro","year":"2006","journal-title":"IEEE Photon. 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