{"id":20646,"date":"2025-10-31T00:25:51","date_gmt":"2025-10-31T00:25:51","guid":{"rendered":"https:\/\/vibromera.eu\/glossary\/laser-vibrometry\/"},"modified":"2026-05-23T22:45:22","modified_gmt":"2026-05-23T22:45:22","slug":"laser-vibrometry","status":"publish","type":"glossary","link":"https:\/\/vibromera.eu\/ga\/glossary\/laser-vibrometry\/","title":{"rendered":"What is Laser Vibrometry? Non-Contact Optical Measurement"},"content":{"rendered":"<h1>Understanding Laser Vibrometry<\/h1>\n\t\t<section class=\"woocommerce hestia-shop products is-shortcode\" id=\"products\" data-sorder=\"hestia_shop\" >\n\t\t\t\t\t\t<div class=\"\">\n\t\t\t\t\t\t<div class=\"hestia-shop-content\">\n\t\t\t<div class=\"row\" data-aos=\"fade-up\" >\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/ga\/product\/balanset-1\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/ga\/product\/balanset-1\/\" title=\"Portable balancer &#038; Vibration analyzer Balanset-1A\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Balanset-1A full kit portable balancer and vibration analyzer\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-18x12.webp 18w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2023\/09\/77-e1693745667801-272x182.webp 272w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/ga\/product-category\/devices\/\" rel=\"tag\">Devices<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/ga\/product\/balanset-1\/\" title=\"Portable balancer &#038; Vibration analyzer Balanset-1A\">Portable balancer &#038; Vibration analyzer Balanset-1A<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">&euro;<\/span>1,975.00<\/span> + VAT (if applicable)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/ga\/wp-json\/wp\/v2\/glossary\/20646?add-to-cart=986\" data-quantity=\"1\" data-product_id=\"986\" data-product_sku=\"BS-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/ga\/wp-json\/wp\/v2\/glossary\/20646?add-to-cart=986\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_986\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"986\" data-product_sku=\"BS-1\" aria-label=\"Add to cart: \u201cPortable balancer &amp; Vibration analyzer Balanset-1A\u201d\" rel=\"nofollow\" data-success_message=\"\u201cPortable balancer &amp; Vibration analyzer Balanset-1A\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_986\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/ga\/product\/vibration-sensor\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/ga\/product\/vibration-sensor\/\" title=\"Vibration sensor\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Balanset-1A vibration sensor close-up\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-768x512.webp 768w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-1024x682.webp 1024w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-3.webp 1280w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/ga\/product-category\/parts\/\" rel=\"tag\">Parts<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/ga\/product\/vibration-sensor\/\" title=\"Vibration sensor\">Vibration sensor<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">&euro;<\/span>90.00<\/span> + VAT (if applicable)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/ga\/wp-json\/wp\/v2\/glossary\/20646?add-to-cart=1820\" data-quantity=\"1\" data-product_id=\"1820\" data-product_sku=\"VS-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/ga\/wp-json\/wp\/v2\/glossary\/20646?add-to-cart=1820\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_1820\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"1820\" data-product_sku=\"VS-1\" aria-label=\"Add to cart: \u201cVibration sensor\u201d\" rel=\"nofollow\" data-success_message=\"\u201cVibration sensor\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_1820\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/ga\/product\/optical-sensor-for-balanset-and-arbalance\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/ga\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"Optical Sensor (Laser Tachometer)\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Optical Sensor (Laser Tachometer)\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-1024x682.webp 1024w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-768x512.webp 768w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-1536x1023.webp 1536w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-18x12.webp 18w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-460x306.webp 460w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/ZKqzGXSCCBU.webp 1600w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/ga\/product-category\/parts\/\" rel=\"tag\">Parts<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/ga\/product\/optical-sensor-for-balanset-and-arbalance\/\" title=\"Optical Sensor (Laser Tachometer)\">Optical Sensor (Laser Tachometer)<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">&euro;<\/span>124.00<\/span> + VAT (if applicable)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/ga\/wp-json\/wp\/v2\/glossary\/20646?add-to-cart=1832\" data-quantity=\"1\" data-product_id=\"1832\" data-product_sku=\"Tach-1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/ga\/wp-json\/wp\/v2\/glossary\/20646?add-to-cart=1832\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_1832\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"1832\" data-product_sku=\"Tach-1\" aria-label=\"Add to cart: \u201cOptical Sensor (Laser Tachometer)\u201d\" rel=\"nofollow\" data-success_message=\"\u201cOptical Sensor (Laser Tachometer)\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_1832\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/ga\/product\/balanset-4\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/ga\/product\/balanset-4\/\" title=\"Balanset-4\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Vibromera rotor balancing kit: carry case, multi-channel signal conditioner, handheld analyzer, magnetic base, vibration sensors, and coiled cables.\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-18x12.webp 18w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-460x306.webp 460w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2022\/12\/balkom4.webp 640w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/ga\/product-category\/devices\/\" rel=\"tag\">Devices<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"shop-item-title-link\" href=\"https:\/\/vibromera.eu\/ga\/product\/balanset-4\/\" title=\"Balanset-4\">Balanset-4<\/a>\n\n\t\t\t\t\t\t\t\t<\/h4>\n\n\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t<div class=\"footer\">\n\n\t\t\t\t\t\t\t\t\t<div class=\"price\"><h4><span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">&euro;<\/span>6,803.00<\/span> + VAT (if applicable)<\/h4><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"stats\">\n\t\t\t\t\t\t\t\t\t\t<a rel=\"nofollow\" href=\"\/ga\/wp-json\/wp\/v2\/glossary\/20646?add-to-cart=1833\" data-quantity=\"1\" data-product_id=\"1833\" data-product_sku=\"BS-4\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart btn btn-just-icon btn-simple btn-default\" title=\"Add to cart\" data-no-translation-title=\"\"><i rel=\"tooltip\" data-original-title=\"Add to cart\" class=\"fas fa-cart-plus\" data-no-translation-data-original-title=\"\"><\/i><\/a>\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a><a href=\"\/ga\/wp-json\/wp\/v2\/glossary\/20646?add-to-cart=1833\" aria-describedby=\"woocommerce_loop_add_to_cart_link_describedby_1833\" data-quantity=\"1\" class=\"button product_type_simple add_to_cart_button ajax_add_to_cart\" data-product_id=\"1833\" data-product_sku=\"BS-4\" aria-label=\"Add to cart: \u201cBalanset-4\u201d\" rel=\"nofollow\" data-success_message=\"\u201cBalanset-4\u201d has been added to your cart\" data-no-translation=\"\" data-trp-gettext=\"\" data-no-translation-aria-label=\"\" data-no-translation-data-success_message=\"\">Add to cart<\/a>\t<span id=\"woocommerce_loop_add_to_cart_link_describedby_1833\" class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div><!-- \/.row --><div class=\"row\">\t\t\t\t\t<div class=\"col-ms-6 col-sm-6 col-md-3 shop-item\">\n\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/ga\/product\/magnet-stand\/\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"card-image\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vibromera.eu\/ga\/product\/magnet-stand\/\" title=\"Magnetic Stand Insize-60-kgf\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"153\" src=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-230x153.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"Magnet base.\" srcset=\"https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-230x153.webp 230w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-600x400.webp 600w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-300x200.webp 300w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-1024x682.webp 1024w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-768x512.webp 768w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-360x240.webp 360w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36-272x182.webp 272w, https:\/\/vibromera.eu\/wp-content\/uploads\/2018\/05\/IMG-36.webp 1280w\" sizes=\"auto, (max-width: 230px) 100vw, 230px\" \/>\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<div class=\"ripple-container\"><\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"content\">\n\t\t\t\t\t\t\t\t<span class=\"category\"><a href=\"https:\/\/vibromera.eu\/ga\/product-category\/parts\/\" rel=\"tag\">Parts<\/a><\/span>\n\t\t\t\t\t\t\t\t<h4 class=\"card-title\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a 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class=\"screen-reader-text\">\n\t\t\t<\/span>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/section>\n\t\t\n<p><strong>Laser vibrometry<\/strong> is a non-contact optical technique for measuring <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/vibration\/\">vibration<\/a> <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/velocity\/\">velocity<\/a> and <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/displacement\/\">displacement<\/a> from the Doppler shift of laser light reflected off a moving surface. A laser Doppler vibrometer (LDV) points a beam at the target; as the surface moves, the frequency of the reflected light shifts in exact proportion to the surface velocity. The instrument detects that frequency shift interferometrically and converts it back into a velocity signal \u2014 all without touching the object, adding mass to it, or preparing the surface beyond making it optically accessible.<\/p>\n<p>That freedom from contact unlocks measurements that are awkward or outright impossible with a mounted <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/accelerometer\/\">accelerometer<\/a>: rotating components, structures so light that the sensor&#8217;s own mass would distort the result, points buried deep inside machinery, hot surfaces, and rapid surveys sweeping hundreds of points across a large panel. LDVs are expensive instruments, but for advanced <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/modal-analysis\/\">modal analysis<\/a> and specialised troubleshooting they are without equal.<\/p>\n<h2>1. Operating Principle<\/h2>\n<p>The method rests on the optical Doppler effect \u2014 the same shift that raises the pitch of an approaching siren, applied to light and measured by interference.<\/p>\n<h3>The laser Doppler chain<\/h3>\n<ol>\n<li><strong>Laser emission:<\/strong> a coherent beam, classically from a helium-neon laser at 633&nbsp;nm (visible red).<\/li>\n<li><strong>Beam splitting:<\/strong> the beam is divided into a measurement beam aimed at the target and an internal reference beam.<\/li>\n<li><strong>Reflection:<\/strong> the measurement beam bounces off the vibrating surface.<\/li>\n<li><strong>Doppler shift:<\/strong> the reflected light&#8217;s frequency is shifted by the instantaneous surface velocity.<\/li>\n<li><strong>Interference:<\/strong> the returning beam is recombined with the reference beam.<\/li>\n<li><strong>Detection:<\/strong> the beat frequency produced by that interference equals the Doppler shift.<\/li>\n<li><strong>Demodulation:<\/strong> the Doppler frequency is decoded into a velocity proportional to the surface motion.<\/li>\n<\/ol>\n<h3>What it measures<\/h3>\n<ul>\n<li><strong>Primary output \u2014 velocity,<\/strong> obtained directly from the Doppler shift.<\/li>\n<li><strong>Displacement,<\/strong> by <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/integration\/\">integrating<\/a> the velocity.<\/li>\n<li><strong>Acceleration,<\/strong> by <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/differentiation\/\">differentiating<\/a> the velocity \u2014 the conversion to <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/acceleration\/\">acceleration<\/a> being a routine post-processing step.<\/li>\n<li><strong>Frequency range:<\/strong> from DC up to around 1.5&nbsp;MHz depending on the model \u2014 far beyond the reach of most contact sensors.<\/li>\n<li><strong>Amplitude range:<\/strong> from nanometres to millimetres, an extraordinarily wide dynamic range.<\/li>\n<\/ul>\n<h2>2. Advantages<\/h2>\n<p>The benefits all flow from one fact \u2014 nothing touches the workpiece.<\/p>\n<ul>\n<li><strong>Truly non-contact:<\/strong> no mass-loading, ideal for lightweight structures, able to measure rotating surfaces such as blades and shafts, and needing no installation time or adhesive.<\/li>\n<li><strong>Accessibility:<\/strong> it reaches points a contact sensor cannot \u2014 measuring from metres away, through windows or optical ports, and onto hot surfaces, vacuum chambers or hazardous areas.<\/li>\n<li><strong>Spatial resolution:<\/strong> a scanning system sweeps a surface rapidly, capturing hundreds of points in minutes, which makes <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/ods-analysis\/\">operating deflection shapes<\/a> and full <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/mode-shape\/\">mode shapes<\/a> easy to acquire; 3D systems extend this to full spatial motion.<\/li>\n<li><strong>Wide bandwidth:<\/strong> genuine DC response (true displacement) up to megahertz frequencies, all from a single instrument.<\/li>\n<\/ul>\n<h2>3. Limitations<\/h2>\n<p>Those capabilities come with real constraints that keep the LDV a specialist rather than an everyday tool.<\/p>\n<ul>\n<li><strong>High cost:<\/strong> systems run from roughly $20,000 to well over $200,000, which rules them out for routine monitoring and reserves them for research and high-value problems.<\/li>\n<li><strong>Line-of-sight required:<\/strong> an unobstructed optical path to the target is mandatory; obstructions and fully enclosed equipment defeat the method.<\/li>\n<li><strong>Surface requirements:<\/strong> the target must reflect the laser usefully. Mirror-bright surfaces can starve the detector and may need <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/reflective-tape\/\">retroreflective tape<\/a> or a light powder coating, while transparent materials are difficult.<\/li>\n<li><strong>Environmental sensitivity:<\/strong> air currents, dust and oil mist scatter the beam, temperature gradients make it wander, and any vibration of the LDV itself corrupts the reading \u2014 so a rigid, isolated mounting is essential.<\/li>\n<\/ul>\n<h2>4. Applications<\/h2>\n<p>Laser vibrometry concentrates where contact sensors fail.<\/p>\n<ul>\n<li><strong>Rotating components:<\/strong> blade vibration in turbines, fans and compressors; the frequency and deflection of individual blades; <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/torsional-vibration\/\">torsional vibration<\/a> of shafts; and gear-tooth vibration. It is complementary to dedicated rotating-blade techniques such as <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/blade-tip-timing\/\">blade tip timing<\/a>.<\/li>\n<li><strong>Lightweight structures:<\/strong> electronics boards and MEMS devices, thin panels and membranes \u2014 anywhere a mounted sensor&#8217;s <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/mounting\/\">mass<\/a> would change the very motion being measured.<\/li>\n<li><strong>Modal analysis:<\/strong> operating-deflection-shape and mode-shape determination, rapid spatial surveys of hundreds of points, and animated displays of how a structure actually deforms.<\/li>\n<li><strong>Special environments:<\/strong> high-temperature surfaces measured from a safe distance, vacuum chambers and clean rooms (no sensor contamination), and hazardous areas surveyed remotely.<\/li>\n<\/ul>\n<h2>5. Types of Laser Vibrometer<\/h2>\n<p>The family spans from a single fixed beam to full three-dimensional systems, trading capability against cost.<\/p>\n<ul>\n<li><strong>Single-point LDV:<\/strong> measures one location at a time, scanned manually or by motor; the most common and economical type.<\/li>\n<li><strong>Scanning LDV:<\/strong> a steerable mirror sweeps the beam across a surface, measuring many points in sequence for automated ODS work.<\/li>\n<li><strong>3D LDV:<\/strong> three beams from different angles resolve motion into X, Y and Z components for complete three-dimensional characterisation \u2014 and the most expensive option.<\/li>\n<li><strong>Rotational LDV:<\/strong> specialised to track a point on a rotating surface, dedicated to torsional-vibration measurement.<\/li>\n<\/ul>\n<h2>6. Measurement Best Practices<\/h2>\n<p>Reliable LDV data depends as much on setup as on the instrument.<\/p>\n<p><strong>Setup:<\/strong> mount the LDV rigidly on a tripod or stand, align it perpendicular to the surface so it senses motion straight toward and away from it, work at an optimal distance (typically 0.3\u20135&nbsp;m), and minimise air currents, mist and stray vibration around the beam path.<\/p>\n<p><strong>Target surface:<\/strong> a clean, diffusely reflective surface gives the best signal; retroreflective tape rescues difficult or dark targets; specular mirror-like reflection should be avoided because it sends the return off-axis; and a light surface coating can help where reflectivity is marginal.<\/p>\n<h2>7. Comparison with Contact Sensors<\/h2>\n<p>Set against conventional transducers, the LDV&#8217;s niche becomes clear: it excels precisely where contact sensors struggle, and vice versa.<\/p>\n<table border=\"1\" style=\"width:100%; border-collapse:collapse;\">\n<tr>\n<th>Feature<\/th>\n<th>Contact sensors<\/th>\n<th>Laser vibrometry<\/th>\n<\/tr>\n<tr>\n<td>Mass loading<\/td>\n<td>Can affect results<\/td>\n<td>Zero (non-contact)<\/td>\n<\/tr>\n<tr>\n<td>Installation<\/td>\n<td>Mounting required<\/td>\n<td>Point and measure<\/td>\n<\/tr>\n<tr>\n<td>Rotating surfaces<\/td>\n<td>Difficult or impossible<\/td>\n<td>Straightforward<\/td>\n<\/tr>\n<tr>\n<td>Cost<\/td>\n<td>Low ($100\u20135,000)<\/td>\n<td>High ($20k\u2013200k+)<\/td>\n<\/tr>\n<tr>\n<td>Routine monitoring<\/td>\n<td>Ideal<\/td>\n<td>Not practical<\/td>\n<\/tr>\n<tr>\n<td>Research \/ special<\/td>\n<td>Limited<\/td>\n<td>Excellent<\/td>\n<\/tr>\n<\/table>\n<p>For the day-to-day reality of field balancing and condition monitoring, the contact sensor still wins on cost, robustness and convenience. A portable two-channel analyser such as the <a href=\"https:\/\/vibromera.eu\/ga\/product\/balanset-1\/\">Balanset-1A<\/a> measures vibration with rugged, low-cost accelerometers of known <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/sensitivity\/\">sensitivity<\/a> and takes its phase reference from an <a href=\"https:\/\/vibromera.eu\/ga\/glossary\/optical-tachometer\/\">optical tachometer<\/a> reading a strip of reflective tape \u2014 a far more practical arrangement for balancing a rotor in its own bearings than aligning an interferometric beam in a working plant. Laser vibrometry and contact instrumentation are therefore complementary: the LDV for the research bench and the genuinely inaccessible measurement, the contact analyser for the production floor.<\/p>\n<p>Laser vibrometry delivers a unique non-contact measurement capability, reaching vibration that traditional sensors simply cannot. Cost and complexity confine it to research and specialised troubleshooting, but for rotating-component analysis, lightweight-structure testing and rapid spatial surveys it remains an invaluable tool in advanced machinery diagnostics and structural dynamics.<\/p>\n<hr>\n<p><a href=\"https:\/\/vibromera.eu\/ga\/glossary\/\">\u2190 Back to Main Index<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Learn about laser vibrometry, optical measurement of vibration using laser Doppler effect, enabling non-contact velocity and displacement measurements on rotating or inaccessible surfaces.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[109,113],"tags":[],"class_list":["post-20646","glossary","type-glossary","status-publish","hentry","category-glossary","category-measurement"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/ga\/wp-json\/wp\/v2\/glossary\/20646","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/ga\/wp-json\/wp\/v2\/glossary"}],"about":[{"href":"https:\/\/vibromera.eu\/ga\/wp-json\/wp\/v2\/types\/glossary"}],"version-history":[{"count":1,"href":"https:\/\/vibromera.eu\/ga\/wp-json\/wp\/v2\/glossary\/20646\/revisions"}],"predecessor-version":[{"id":101356,"href":"https:\/\/vibromera.eu\/ga\/wp-json\/wp\/v2\/glossary\/20646\/revisions\/101356"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/ga\/wp-json\/wp\/v2\/media?parent=20646"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/ga\/wp-json\/wp\/v2\/categories?post=20646"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/ga\/wp-json\/wp\/v2\/tags?post=20646"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}