Full-Bridge Strain Gauge | Precision Foil Sensor | BF350-3EB 350 Ohm

This full bridge strain gauge measures stress, force, or weight. It works by sensing tiny bends or changes in a surface. The full bridge setup has four active parts. This gives it more sensitivity and temperature balancing than quarter or half bridge setups. Features and Benefits - Full Bridge Setup - It gives a stronger signal and better accuracy for precise measurements. - Foil Design - The foil construction lets it fit onto surfaces. It also provides a steady base for the resistive grid. - Two Resistance Choices - It comes in BF350 (350 ohm) and BF1K (1000 ohm) versions to fit different circuit designs. - Main Sensing Part - This is the basic piece you need to build your own custom load cells or pressure sensors. Applications - Making a custom digital scale for weighing items with high accuracy. - Adding sensors to mechanical parts to watch stress and fatigue as they happen. - Building a system to monitor a structure's health and detect strain in beams or supports. How It Works A strain gauge is a sensor that measures strain. This product is a Full-Bridge Strain Gauge, a type of precision foil sensor. When an object is subjected to an external force, it deforms, either stretching or compressing. This deformation is known as strain. Strain gauges work by converting this mechanical deformation into an electrical signal. As the object strains, the resistance of the gauge changes proportionally. This change in resistance can then be measured to determine the amount of strain. Measuring the Output The Full-Bridge Strain Gauge, with its 350 Ohm resistance, is designed for precise measurement. Due to its full-bridge configuration, it offers enhanced sensitivity and stability compared to other gauge types. The change in electrical resistance across the gauge is typically very small. To measure this accurately, the gauge is usually connected to a Wheatstone bridge circuit. This circuit converts the resistance change into a measurable voltage output. This voltage is proportional to the applied strain, allowing for precise quantification. Common Applications Strain gauges are widely used in various applications where precise measurement of force, weight, and pressure is required. This Full-Bridge Strain Gauge is suitable for general-purpose strain measurement. Common applications include: - Structural health monitoring - Material testing - Load cells for weighing systems - Transducers for pressure and torque measurement - Industrial automation How They Work Strain gauges, including this precision foil sensor, operate on the principle of piezoresistivity. When the object to which the gauge is mounted deforms, the thin metallic foil within the gauge also deforms. This deformation causes a change in the electrical resistance of the foil. Stretching the foil increases its length and decreases its cross-sectional area, leading to an increase in resistance. Compressing it has the opposite effect. This change in resistance is directly proportional to the strain applied to the object. Measuring the Signal The electrical signal from a strain gauge, such as this Full-Bridge Strain Gauge, is typically a small change in resistance. To effectively measure this, the gauge is integrated into a Wheatstone bridge circuit. This circuit consists of four resistors, with the strain gauge forming one or more arms of the bridge. As the gauge's resistance changes due to strain, the balance of the bridge is upset, producing a measurable voltage output. This voltage signal can then be amplified and processed by data acquisition systems to display the strain value.