{"id":14488,"date":"2023-09-06T11:51:10","date_gmt":"2023-09-06T10:51:10","guid":{"rendered":"https:\/\/www.sylex.sk\/product\/princip-fbg\/"},"modified":"2025-01-17T10:44:36","modified_gmt":"2025-01-17T09:44:36","slug":"fbg-principle","status":"publish","type":"product","link":"https:\/\/www.sylex.sk\/sk\/produkt\/fbg-principle\/","title":{"rendered":"FBG Principle"},"content":{"rendered":"\t\t<div data-elementor-type=\"product-post\" data-elementor-id=\"14488\" class=\"elementor elementor-14488 elementor-517\" data-elementor-post-type=\"product\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-1e0d00a9 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"1e0d00a9\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-6ed3f60c\" data-id=\"6ed3f60c\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-e92a8b2 elementor-widget elementor-widget-text-editor\" data-id=\"e92a8b2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>A fiber bragg grating is basically a spatial variation of the refractive index inside the core of an optical fiber. This variation is created by exposing the core to a periodic pattern of UV light with a defined energy. After this process the grating works as a wavelength selective mirror.\u00a0 At each position of the periodic index variation a small part of the light travelling along the fiber is reflected back.\u00a0 These small portions of reflected light are combined coherently to one large reflection. The wavelength where the maximum reflection occurs is called the Bragg wavelength and meets the Bragg condition:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-d6d0c94 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"d6d0c94\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-c77f9d7\" data-id=\"c77f9d7\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-4dae8e0 elementor-widget elementor-widget-image\" data-id=\"4dae8e0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"254\" height=\"87\" src=\"https:\/\/www.sylex.sk\/wp-content\/uploads\/2024\/04\/formula.png\" class=\"attachment-large size-large wp-image-11854\" alt=\"\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-eb5eeb4 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"eb5eeb4\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-5d0069a\" data-id=\"5d0069a\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-dca3e02 elementor-widget elementor-widget-text-editor\" data-id=\"dca3e02\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>n<sub>eff<\/sub>\u00a0\u2013 effective refractive index over the exposed region<br \/>\u039b \u2013 Grating period<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-dea760f elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"dea760f\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-632d57b\" data-id=\"632d57b\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-9fbe863 elementor-widget elementor-widget-image\" data-id=\"9fbe863\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"799\" height=\"506\" src=\"https:\/\/www.sylex.sk\/wp-content\/uploads\/2024\/04\/FBG-Principle.jpg\" class=\"attachment-large size-large wp-image-11853\" alt=\"\" srcset=\"https:\/\/www.sylex.sk\/wp-content\/uploads\/2024\/04\/FBG-Principle.jpg 799w, https:\/\/www.sylex.sk\/wp-content\/uploads\/2024\/04\/FBG-Principle-300x190.jpg 300w, https:\/\/www.sylex.sk\/wp-content\/uploads\/2024\/04\/FBG-Principle-768x486.jpg 768w, https:\/\/www.sylex.sk\/wp-content\/uploads\/2024\/04\/FBG-Principle-600x380.jpg 600w\" sizes=\"(max-width: 799px) 100vw, 799px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-0e6a323 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"0e6a323\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-646d95b\" data-id=\"646d95b\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-d20aea9 elementor-widget elementor-widget-text-editor\" data-id=\"d20aea9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>This equation indicates that the Bragg wavelength can be affected by the change of the 2 parameters mentioned above (effective refractive index and grating period). This explains why an FBG is sensitive to strain change and temperature:<\/p><ul><li>A\u00a0strain change leads to a\u00a0displacement of the grating period, and to a variation in the effective refractive index through the stress-optic effect<\/li><li>Temperature change affects the effective refractive index through the thermo-optic effect and the grating period through the thermal expansion of the fiber.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-c187390 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"c187390\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-22c5a18\" data-id=\"22c5a18\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-54825b6 elementor-widget elementor-widget-text-editor\" data-id=\"54825b6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>These effects are approximately described by the following equation:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-7e9294f elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"7e9294f\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-b7eabe1\" data-id=\"b7eabe1\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-ab1107e elementor-widget elementor-widget-image\" data-id=\"ab1107e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"458\" height=\"94\" src=\"https:\/\/www.sylex.sk\/wp-content\/uploads\/2024\/04\/formula2.png\" class=\"attachment-large size-large wp-image-11852\" alt=\"\" srcset=\"https:\/\/www.sylex.sk\/wp-content\/uploads\/2024\/04\/formula2.png 458w, https:\/\/www.sylex.sk\/wp-content\/uploads\/2024\/04\/formula2-300x62.png 300w\" sizes=\"(max-width: 458px) 100vw, 458px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-825ab43 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"825ab43\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-d8ca6fa\" data-id=\"d8ca6fa\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-0638164 elementor-widget elementor-widget-image\" data-id=\"0638164\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"416\" src=\"https:\/\/www.sylex.sk\/wp-content\/uploads\/2024\/04\/FBG-Principle-2-1024x532.jpg\" class=\"attachment-large size-large wp-image-11851\" alt=\"\" srcset=\"https:\/\/www.sylex.sk\/wp-content\/uploads\/2024\/04\/FBG-Principle-2-1024x532.jpg 1024w, https:\/\/www.sylex.sk\/wp-content\/uploads\/2024\/04\/FBG-Principle-2-300x156.jpg 300w, https:\/\/www.sylex.sk\/wp-content\/uploads\/2024\/04\/FBG-Principle-2-768x399.jpg 768w, https:\/\/www.sylex.sk\/wp-content\/uploads\/2024\/04\/FBG-Principle-2-600x312.jpg 600w, https:\/\/www.sylex.sk\/wp-content\/uploads\/2024\/04\/FBG-Principle-2.jpg 1063w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-26ed750 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"26ed750\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-a157161\" data-id=\"a157161\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-846f2ca elementor-widget elementor-widget-text-editor\" data-id=\"846f2ca\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>In a case, that an FBG is subject to thermal and mechanical variations at the same time, there is no technique how to distinguish them from each other. To solve this, there are several methods. One possibility is to fabricate a sensor, which is sensitive only to temperature changes. By the means of this temperature sensor it\u2019s possible to compensate the temperature effects of a strain sensor.<\/p><p>There are two types of temperature compensation. As it\u2019s shown in the formula the temperature influence is composed of two effects: thermal expansion of the load-transferring material and the thermo-optic effect. The first type of compensation compensates only the thermo-optic effect, and the second type compensates both of them. It always depends on the application which type should be chosen.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-3e47cd0 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"3e47cd0\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-ad15e73\" data-id=\"ad15e73\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-b966a25 elementor-align-center elementor-widget elementor-widget-button\" data-id=\"b966a25\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/www.sylex.sk\/wp-content\/uploads\/2024\/04\/FBG-Principle.pdf\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-icon\">\n\t\t\t\t<i aria-hidden=\"true\" class=\"far fa-file-pdf\"><\/i>\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Download PDF version<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p class=\"bodytext\">A fiber bragg grating is basically a spatial variation of the refractive index inside the core of an optical fiber. This variation is created by exposing the core to a periodic pattern of UV light with a defined energy. After this process the grating works as a wavelength selective mirror. At each position of the periodic index variation a small part of the light travelling along the fiber is reflected back. These small portions of reflected light are combined coherently to one large reflection.<\/p>\n","protected":false},"featured_media":10281,"template":"","meta":{"_acf_changed":false},"product_brand":[],"product_cat":[405,539],"product_tag":[],"class_list":{"0":"post-14488","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-snimace-a-snimacie-systemy","7":"product_cat-technologia","9":"first","10":"instock","11":"shipping-taxable","12":"product-type-simple"},"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>FBG Principle - Sylex<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.sylex.sk\/sk\/produkt\/fbg-principle\/\" \/>\n<meta property=\"og:locale\" content=\"sk_SK\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"FBG Principle - Sylex\" \/>\n<meta property=\"og:description\" content=\"A fiber bragg grating is basically a spatial variation of the refractive index inside the core of an optical fiber. This variation is created by exposing the core to a periodic pattern of UV light with a defined energy. After this process the grating works as a wavelength selective mirror. At each position of the periodic index variation a small part of the light travelling along the fiber is reflected back. 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