{"id":401,"date":"2025-12-23T10:40:17","date_gmt":"2025-12-23T10:40:17","guid":{"rendered":"https:\/\/proact-ims.com\/blog\/?p=401"},"modified":"2026-08-03T05:32:38","modified_gmt":"2026-08-03T05:32:38","slug":"what-is-strain-gauge-and-working-principle","status":"publish","type":"post","link":"https:\/\/www.proact-ims.com\/blog\/what-is-strain-gauge-and-working-principle\/","title":{"rendered":"What Is a Strain Gauge? Working Principle & Applications"},"content":{"rendered":"\t\t
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What Is a Strain Gauge? Working Principle & Applications<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Table Of Contents<\/p>\t\t\t\t<\/div>\n\t\t\t\t

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What is Strain Gauge and Working?<\/a><\/p>\t\t\t\t<\/div>\n\t\t\t\t

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Applications of Strain Gauges<\/a><\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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External force applied to an elastic material generates stress, which subsequently generates deformation in the material. At this time, the length of the material L extends to L+\u0394L if the applied force is a tensile force. The ratio of \u0394 L to L, that is \u0394 L\/L, is called strain. On the other hand, if a compressive force is applied, the length L is reduced to L\u2212\u0394L. Strain at this time is (\u2212\u0394L\/L).<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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What is Strain gauge and working? <\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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The electric resistance of a metal change proportionally to the mechanical deformation caused by an external force applied to the metal. By bonding a thin metal to a measurement object through a thin electrical insulator, the metal deforms depending on deformation of the measurement object and its electric resistance changes. The strain gauge<\/a> (electric resistance strain gauge) is a sensor to measure the strain by means of measuring the resistance change. A strain gauge is constructed by forming a grid made of fine electric resistance wire or photographically etched metallic resistance foil on an electrical insulation base (backing), and attaching gauge leads.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"what\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t
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  • \n\t\t\t\t\t\t\t\t\t\tDeformation and resistance:<\/strong> When a force is applied, it causes the object to stretch (tensile strain) or compress (compressive strain). This deformation also causes the strain gauge's grid to elongate or shorten. <\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
  • \n\t\t\t\t\t\t\t\t\t\tPhysical principle:<\/strong> According to the principles of electrical resistance, the resistance of a wire is proportional to its length and inversely proportional to its cross-sectional area.
    When stretched, the wire becomes longer and thinner, increasing its resistance.
    When compressed, the wire becomes shorter and thicker, decreasing its resistance.<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
  • \n\t\t\t\t\t\t\t\t\t\tElectrical measurement:<\/strong> The strain gauge is wired into a circuit, typically a Wheatstone bridge, which is designed to be balanced to produce zero voltage when there is no strain.<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
  • \n\t\t\t\t\t\t\t\t\t\tSignal conversion:\u202f<\/strong> As the strain gauge's resistance changes, it unbalances the bridge and produces a small, proportional output voltage. This voltage is then amplified to get a meaningful reading.\u202f<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t
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    Strain gauges are generally used for one of three reasons:<\/strong><\/p>

    • To\u00a0ascertain\u00a0the amount of deformation caused by strain<\/span><\/li>
    • To ascertain\u00a0the stress caused by strain and the degree of safety of a material or\u00a0of a structural element that uses that material.<\/li>
    • To indirectly ascertain\u00a0various physical quantities by converting them to strain.\u00a0There are\u00a0a number of\u00a0ways of measuring strain mechanically and\u00a0electrically, but\u00a0the vast majority of\u00a0stress measurement is carried out\u00a0<\/span><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t
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      using strain gauges due to their superior measurement characteristics. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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      When strain is generated in a measurement object, the strain is transferred to the resistance wire or foil of the strain gauge via the gauge base (backing). As a result, the wire or foil experiences a resistance change.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

      \n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"Uses\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t
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      <\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t
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      Application of strain gauges<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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      Strain gauges have a wide range of applications, including the measurement of force, pressure, and torque in industries like automotive, aerospace, and biomedical engineering. They are also used in structural health monitoring for bridges and buildings, material testing to analyse stress and strain, and in various industrial and consumer products like weighing scales.<\/p>\n\n \t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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      Material testing:<\/h3>\t\t\t\t<\/div>\n\t\t\t\t
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      Widely used in tensile, compression, vibration, and fatigue testing to study material properties under different conditions.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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      Engineering and structural monitoring:<\/h3>\t\t\t\t<\/div>\n\t\t\t\t
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      Structural Health Monitoring (SHM): Used to monitor the integrity of structures like bridges and buildings by detecting stress and strain, which helps in preventing failure.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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      Geotechnical engineering: <\/h3>\t\t\t\t<\/div>\n\t\t\t\t
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      Monitors the deformation of soil, rock, and underground structures like tunnels and retaining walls to assess stability.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

      \n\t\t\t\t\t\t\t\t\t

      Industrial applications<\/strong><\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

      \n\t\t\t\t\t\t\t\t\tWeight and force measurement: Found in weighing scales (for process, crane, and platform scales), tank weighing, and other applications where force needs to be measured. \n\n \n\nTorque and power measurement: Measures torque in rotating equipment like motors, turbines, and engines in power plants, ships, and industrial machinery. \n\n \n\nIndustrial automation: Used for process monitoring, quality control, and automation in various manufacturing settings. \t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t
      \n\t\t\t\t\t\t\t\t\t

      Automotive and aerospace<\/strong><\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

      \n\t\t\t\t\t\t\t\t\t

      Vehicle testing: Used in crash simulations, brake testing, and vehicle emission testing. Aerospace: Applied in aircraft and missile production to monitor strain on components. Rotating equipment: Measures torque in applications like generators and propeller shafts.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

      \n\t\t\t\t\t\t\t\t\t

      Biomedical and consumer products<\/strong><\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

      \n\t\t\t\t\t\t\t\t\t

      Biomedical equipment: Integrated into surgical tables, dental chairs, and MRI equipment for patient monitoring. Prosthetics: Used in prosthetic legs to sense usage mode and adjust settings. Consumer electronics: Found in products like smart phones and bathroom scales.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

      External force applied to an elastic material generates stress, which subsequently generates deformation in the material. At this time, the length of the material L extends to L+\u0394L if the applied force is a tensile force.<\/p>\n","protected":false},"author":1,"featured_media":496,"comment_status":"open","ping_status":"open","sticky":false,"template":"elementor_canvas","format":"standard","meta":{"om_disable_all_campaigns":false,"pagelayer_contact_templates":[],"_pagelayer_content":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-401","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"yoast_head":"\nWhat Is a Strain Gauge? 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