Fiber Optic Strain Gauges

Fiber optic strain gauges operate on a simple principle: a change in strain alters the wavelength of light reflected within a fiber segment. That shift gets decoded by an interrogator, giving you a direct strain measurement at a point without any electrical components near the sensing zone. This makes the sensors immune to electromagnetic interference, lightning strikes, and conductive corrosion—practical concerns when you’re embedding gauges inside a concrete dam or bolting them to a steel bridge girder for a decade. Kingmach supplies a wide range of these optical strain sensors, with options that can be chained along a single fiber over distances exceeding several kilometers. That cuts down cabling clutter and data acquisition costs compared to running dozens of individual twisted-pair wires back to a logger. The gauges are typically available in standard gauge lengths from a few centimeters to several decimeters, but we frequently adjust the active length, coating material, and termination style to match a project’s specific installation method and chemical exposure. We’ve delivered sensors armored for direct embedment in concrete, with rugged jacket materials for surface-mount outdoor use on bridges, and in stainless steel housings for underwater or high-humidity environments. Installation doesn’t have to be a headache. The sensors bond similarly to resistive strain gauges using industrial adhesives, but without the worry of moisture degrading electrical connections. For large arrays, our team can help you design a fiber routing plan that minimizes in-field splicing and optical loss—an issue that becomes critical on remote sites without easy access to fiber specialists. Data integration is another area where we fill the gap. While Kingmach doesn’t force you to buy a specific interrogator, our application engineers can recommend third-party units that match your strain range, resolution, and sampling rate. We also provide calibration sheets that link the optical wavelength shift to strain in straightforward µε values, so your structural engineering team can plug the numbers directly into their finite element models. This blend of customizable hardware and straight-talking support makes optical strain monitoring practical for firms that previously found it too complex or expensive to adopt.