os3150 Optical Strain Gage – Rugged Spot-Weldable FBG Strain Sensor
Rugged, spot-weldable fiber Bragg grating (FBG) optical strain gage with a 75 mm gage length and ± 2,500 με strain limits.
- Strain Sensitivity
- ~ 1.4 pm/με
- Gage Length
- 75 mm
- Operating Temperature Range
- -40 to 80° C
- Strain Limits
- ± 2,500 με
Overview
The os3150 is a rugged, spot-weldable strain gage based on fiber Bragg grating (FBG) technology. It is designed for outdoor installations on steel structures. Its stainless steel carrier holds the FBG in tension and protects the fiber during installation. No epoxy holds the fiber to the carrier, which supports long-term stability by design.
For temperature compensation, the os3150 can be connected in series with an FBG temperature gage such as the os4350. The os3155 uses the same strain measurement approach and adds built-in temperature compensation. Some applications combine os3150 and os3155 gages.
Installation
Installation takes a few minutes. Because the gage is welded in place, it can be used right after attachment, with no wait for adhesives to cure. Armored cables lead to and from each gage to protect the fiber. The armored cable is compatible with connector protection fittings, which protect splice-free series connections to strain, temperature, acceleration and other optical sensors. The whole gage package is typically covered with a protective material for long-term protection.
Performance and arrays
In side-by-side comparisons with foil strain gages, the manufacturer reports that the os3150 is equally sensitive and accurate, with a greater strain range and 100 times more fatigue life. The gage is qualified for harsh environments. It can be used on its own or in series as part of an FBG sensor array, which needs less cabling than comparable electronic gage networks. Several gages can be placed close together at 0, 45 and 90 degrees for strain rosette measurements.
Key Features
- Rugged, permanent weldable package
- Armored cable integrated with sensor package for fiber protection and strain relief
- Fast, simple, repeatable installation
- Double-ended design supports multiplexing of many sensors on one fiber
- Qualified to same rigorous standards used for comparable electronic gages
- Gage installation and protection achieved with same methods as conventional electronic gages
- Micron Optics' patented micro opto-mechanical technology
- Included in ENLIGHT's sensor templates for quick and easy optical to mechanical conversions
- No epoxies holding the fiber to the carrier
- Can be arranged at 0, 45 and 90 degrees for strain rosette measurements
Specifications
| Strain Sensitivity |
~ 1.4 pm/με
Actual gage factor provided with gage
|
|---|---|
| Gage Length | 75 mm |
| Operating Temperature Range | -40 to 80° C |
| Strain Limits | ± 2,500 με |
| Fatigue Life | 100 x 10^6 cycles, ± 2,000 με |
| Integrated temperature compensation sensor |
Yes
Stated on the product page; the datasheets say the os3150 needs a separate FBG temperature gage (e.g. os4350) for temperature compensation, and that integrated compensation belongs to the os3155
|
| Dimensions |
See diagram below
Without cable
|
|---|---|
| Weight |
15 g
Without cable
|
| Carrier Material | 302 stainless steel |
| Cable Length | 1 m (± 10 cm), each end |
| Fiber Type | SMF28-Compatible |
| Cable Type | 3 mm armored cable |
| Connectors | Optional |
| Cable Bend Radius | ≥ 17 mm |
| Fastening Methods |
Spot weld
See manufacturer installation details
|
| Peak Reflectivity (Rmax) | > 70% |
|---|---|
| FWHM (- 3 dB point) | 0.25 nm (± .05 nm; apodized grating) |
| Isolation | > 15 dB (@ ± 0.4 nm around center wavelength) |
| Part number format |
os3150-wwww-1xx-1yy
Example: o3150-1552-1FC-1FC
|
|---|---|
| Wavelengths (wwww) |
Standard - 1460 to 1620 nm in 4 nm intervals
+/- 1nm
|
| Cable 1 and Cable 2 length |
1 m Standard, Cable Length
Code 1 in 1xx / 1yy
|
Specifications are taken from the manufacturer's documentation. See the datasheet for complete and current values.
Applications
- SHM for civil and geotechnical structures
- SHM for energy systems
- Structural test and model validation
- Structures (bridges, dams, tunnels, mines, buildings, oil platforms)
- Energy (wind turbines, oil wells, pipelines, nuclear reactors, generators)
- Transportation (railways, trains, roadways, specialty vehicles, cranes)
- Marine vessels (hull, deck, cargo containers)
- Aerospace (airframes, composite structures, wind tunnels, static and dynamic tests)
- Homeland security (perimeter intrusion, heat detection, security gate monitoring)
Options & Accessories
| Option | Description |
|---|---|
| UT | Unterminated — Termination type for cable 1 (xx) or cable 2 (yy) |
| FC | FC/APC Connector — Termination type for cable 1 (xx) or cable 2 (yy) |
| PF | FC/APC Connector with Protection Fitting — Termination type for cable 1 (xx) or cable 2 (yy) |
Documents & Resources
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