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Fiber-optic sensors and electrical resistance strain gauges can both measure structural strain, but neither is universally better for structural health monitoring (SHM). Fiber-optic systems—especially fiber Bragg grating (FBG) arrays—may suit projects that need electromagnetic-interference immunity, multiplexed measurements, or long-gauge and distributed sensing. Electrical strain gauges are an established option for discrete measurement points. The right choice depends on the measurement goal, site conditions, readout equipment, installation, maintenance, and the cost of the complete system—not just the sensor.
How do fiber-optic sensors and electrical strain gauges measure strain?
Fiber Bragg grating sensors
An FBG sensor contains a grating in an optical fiber that reflects a narrow band of light. When strain changes the spacing of the grating, the reflected Bragg wavelength shifts. An optical interrogator reads that change and converts it into a measurement. This basic mechanism is described in HBK’s overview; HBK is a manufacturer, so treat its page as a vendor explanation.
Electrical resistance strain gauges
An electrical resistance strain gauge produces a resistance-related electrical measurement as it strains. It must be connected to compatible electrical measurement or data-acquisition equipment. The exact wiring and acquisition arrangement depends on the system design.
In either case, the sensor is only one part of the measurement chain. A monitoring system also needs a way to read the sensor and store its measurements. FHWA describes these components in its chapter on bridge-substructure monitoring: Federal Highway Administration, Chapter 2.
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- 【Modle】The FS-N18 fiber-optic amplifier provides ultra-stable performance and smart tuning for high-speed, reliable detection for standard or demanding applications.
- 【Supply Voltage】DC 12-24V (brown-positive pole, blue-negative pole, black-signal output).Products include: optical fiber amplifier, product English user manual.
- 【Simple Setup】One push setting with the PRESET Button，Laser, fiberoptic, and photoelectric models all sharethe same simple functionality.
- 【Features】 It is a sensor type component with Button ,adjustment switch, output indicator light，HD LED dual digital display and signal strength indicator light, high sensitivity and low delay.
- 【Scope of application】Fibre optic sensors are suitable for use in a wide range of industries including automotive, liquid crystal, food and pharmaceutical packaging, smartphones and electronics, Position counting ，distinguish colors ，and detect positive negative products，lithium ion batteries and solar cells. (Recommended to use with the store's optical fiber)
Where can fiber-optic sensing be an advantage?
Bridge-monitoring literature identifies several reported strengths of fiber-optic sensors, including resistance to electromagnetic interference, small dimensions, environmental resistance, multiplexing, long-distance interrogation, and flexibility in small- or long-gauge measurements. These are system- and sensor-dependent capabilities, not a guarantee that every fiber-optic sensor provides all of them. The 2003 paper by Joan R. Casas and Paulo J. S. Cruz describes these applications and properties at the abstract level: “Fiber Optic Sensors for Bridge Monitoring,” Journal of Bridge Engineering.
FBG arrays can multiplex multiple sensing points on a fiber, while long-gauge and fully distributed methods are distinct approaches with different spatial coverage and readout needs. A project that needs a continuous strain profile should not assume that a set of point FBG sensors provides the same coverage: specify the required measurement spacing or resolution and select a compatible sensing and interrogation architecture.
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- Model FV-22N Fiber-Optic Amplifier: The FV-22N fiber-optic amplifier provides ultra-stable performance and smart tuning for high-speed, reliable detection for standard or demanding applications
- Simple Setup and Operation: One push setting with the PRESET Button, Laser, fiberoptic, and photoelectric models all share the same simple functionality. With sensitivity adjustment switch, output indicator and signal intensity indicator
- Supply Voltage and Package Contents: DC 12-24V (brown-positive pole, blue-negative pole, black-signal output). Products include optical fiber amplifier and product English user manual (Excluding fiber optic cables)
- Durable Features and Components: It is a sensor type component with Button, adjustment switch, output indicator light, HD LED dual digital display and signal strength indicator light, Durable and sturdy, resistant to high temperatures, capable of working for extended periods in environments ranging from 0-55 degrees C, with high precision and stability
- Wide Range of Industrial Applications: Fiber optic sensors are suitable for a wide range of industries, including new energy, industrial products, semiconductors, 3C, automotive, electronics, position counting, color differentiation and detection of positive and negative products, lithium-ion batteries, and vibration discs (Recommended to be used together with the fiber optic cable in the store)
Where do electrical strain gauges fit?
Electrical resistance gauges are a documented, established choice for structural instrumentation, including bridge-foundation monitoring. They can be appropriate when a project needs strain at defined locations and its electrical acquisition, wiring, and access requirements are manageable. Their practical performance depends on installation and environmental protection; a gauge’s long-term reliability cannot be inferred from sensor type alone.
FHWA’s archived report documents one historical West Seattle bridge pile-instrumentation case. At the 20-year mark, 17 of 62 gauges (27 percent) were not functioning, including 17 of 36 underwater gauges. The report suggests water resistance may have contributed to underwater-gauge failures; it does not establish the cause or show that the same failure rate applies to other gauges, installations, or modern systems. FHWA also cautions that the chapter’s technical information may be dated.
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- 【Features】It has strong anti-interference ability, fine diameter, soft quality and light weight. Simple installation, easier circuit connection.
- 【Application】Railway monitoring, urban construction, production equipment testing, for automatic equipment product positioning, counting, identification and so on.
How do the complete systems compare?
| Decision factor | Fiber-optic system | Electrical strain-gauge system | Question to resolve |
|---|---|---|---|
| Electrical and magnetic environment | FHWA and bridge-monitoring literature report relative immunity to electromagnetic interference or fields. | Readout is electrical; the reviewed sources do not quantify a universal interference penalty. | Could nearby equipment or power systems affect readings, and what shielding or routing is needed? |
| Coverage and layout | FBG systems can support multiplexed arrays. Long-gauge and distributed sensing are separate options with distinct architectures. | Often arranged as discrete gauges; channel count, wiring, and bridge circuits shape the layout. | Are defined measurement points enough, or is long-gauge or distributed coverage required? |
| Readout and acquisition | Needs a compatible optical interrogator for the sensor type, array, and required sampling rate. | Needs compatible electrical conditioning and data acquisition. FHWA documents both portable manual readout and data-acquisition arrangements. | What sampling rate, timing, remote access, and data retention does the monitoring decision require? |
| Installation and exposure | Small fiber dimensions and environmental resistance are cited advantages, but routing and protection still matter. | Durability depends on installation and environmental protection; FHWA’s submerged-gauge case is a specific historical example. | Can sensors be bonded, embedded, routed, protected, inspected, or replaced under the site’s water, chemical, and temperature conditions? |
| Lifecycle cost | Requires budgeting for sensors, fiber routing, interrogator, installation, and maintenance. | Requires budgeting for gauges, wiring, acquisition equipment, installation, and maintenance. | What is the comparable cost over the service period for each complete system? |
| Measurement objective | Bridge-monitoring literature describes fiber-optic applications to strain, temperature, inclination, acceleration, load, and other measurements. | FHWA documents strain gauges in bridge foundation instrumentation and long-term monitoring. | Which measurand and engineering decision must the monitoring support? |
What does the cost evidence show?
Cost comparisons should include the full measurement system: sensor count, optical interrogator or electrical acquisition equipment, fiber or wiring, installation access and labor, sampling requirements, maintenance, and replacement. Unit sensor prices alone do not establish which architecture costs less over a project’s life.
An ASTM-indexed paper by Shiping Chen and James S. Sirkis, published in 2001, reports that its system-level analysis found FBG superior in performance and lower in cost per sensor for applications requiring more than 35 sensing points. That is a dated result from a particular analysis—not a current price comparison, a universal break-even point, or a rule for present-day projects. The accessible record provides the abstract, not the full paper: ASTM paper record.
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- 【Product parameters】 Model: FR6Y10, Induction mode: Diffuse Reflective Optical Fiber Sensor, Outer diameter of optical fiber: 2mm, Internal diameter of optical fiber: 1.0mm. Line length: 1m
- 【High-quality Material】Made of TPV, the internal use of high-quality wire,Sheath protection up to 10000000 times bending.
- 【Safe Design】Insulation, non - inductive electrical properties, resistant to water, high temperature and corrosion.
- 【Features】It has strong anti-interference ability, fine diameter, soft quality and light weight. Simple installation, easier circuit connection.
- 【Application】Railway monitoring, urban construction, production equipment testing, for automatic equipment product positioning, counting, identification and so on.
How should a project choose?
- Define the monitoring decision. State what quantity must be measured—such as strain—and what engineering action the measurement should inform.
- Specify coverage and performance. Set the number and location of measurement points, any long-gauge or distributed coverage, required spatial resolution, sampling rate, and timing needs.
- Characterize the site. Assess electromagnetic conditions, water and chemical exposure, temperature, installation access, and whether sensors can be protected, inspected, or replaced.
- Choose a complete readout architecture. Match the fiber sensors to an optical interrogator, or electrical gauges to compatible conditioning and acquisition equipment. Include data storage, remote access, and routing in the design.
- Compare lifecycle estimates. Ask for comparable estimates covering equipment, installation, access, maintenance, and likely replacement—not just sensor unit costs.
FHWA’s balanced framing remains useful: “All of them have their pros and cons, but each can be useful to a certain degree.” The practical choice is the architecture that reliably answers the project’s monitoring question under its actual site and service conditions.
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Quick Recap
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- Dual Digital Display: Equipped with a two-color LED digital display, green display shows current detection value, red display setting threshold, intuitive and clear readings
- Long Range Fiber Sensor: Uses diffuse reflective sensor photoelectric switch technology that supports long distance optical communication, making it suitable for a wide range of industrial detection scenarios
- 2-Point Calibration Settings: The calibration can be done with a simple two-step SET button operation, press once when no workpiece, place the workpiece and press once again, complete setup quickly
- Wide voltage supply: support 12-24V DC wide range voltage input, strong compatibility, suitable for all kinds of industrial automation control system access
- English instruction manual included (English language not guaranteed). Detailed installation and commissioning instructions are included for quick and easy application
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