os3155 Optical Strain Gage with Integrated Temperature Compensation (FBG)
Rugged, spot-weldable FBG optical strain gage with a second integrated FBG for temperature compensation, for steel structures.
- Strain Sensitivity
- ~ 1.2 pm/με
- Gage Length
- 50 mm
- Operating Temperature Range
- -40 to 80° C
- Strain Limits
- ± 2,500 με
Overview
The os3155 is a rugged optical strain gage based on fiber Bragg grating (FBG) technology, with an integrated second FBG for temperature compensation. It is designed for outdoor installations on steel structures. A stainless steel carrier holds the strain FBG in tension and protects the fiber during installation. No epoxy holds the fiber to the carrier, so the design supports long-term stability.
The os3155 shares its design with the os3150 rugged strain gage. The added temperature FBG sits close to the strain FBG, which makes temperature compensation more accurate. It also lowers installation cost, because fewer extra cables, splices and separate temperature gages are needed.
The gage is spot-welded in place, so it can be used right after attachment with no adhesive cure time. Armored cables run to and from each gage. Optional protection fittings guard series connections in harsh environments, so the gage can be connected in the field to other optical strain, acceleration or temperature sensors on the same fiber. After installation, the whole package is usually covered with a protective material for long-term protection.
In side-by-side comparisons with foil strain gages, the os3155 is equally sensitive and accurate, with a greater strain range and 100 times more fatigue life. It can be used alone or in series as part of an FBG sensor array. Several gages can be placed close together at 0, 45 and 90 degrees for strain rosette measurements. The os3155 is included in the ENLIGHT software sensor templates for optical-to-mechanical conversion.
Key Features
- Rugged, permanent weldable package
- Temperature compensation sensor integrated inside for relative temperature measurement
- Close proximity of strain FBG to temperature FBG improves accuracy of strain measurement
- 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 the same standards used for comparable electronic gages
- Gage installation and protection achieved with the same methods as conventional electronic gages
- Micron Optics' patented micro opto-mechanical technology
- Included in ENLIGHT's sensor templates for optical to mechanical conversions
Specifications
| Strain Sensitivity |
~ 1.2 pm/με
Actual gage factor provided with gage
|
|---|---|
| Gage Length | 50 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
Page table shows the 'Yes' and '–' entries in swapped columns; the os3155 datasheet confirms the integrated temperature FBG
|
| Dimensions |
See Diagram Below
Dimensions in mm per assembly drawing
|
|---|---|
| Weight | 17 g |
| Carrier Material | 302 Stainless Steel |
| Cable Length | 1 m (± 10 cm), each end |
| Cable Type | 3 mm armored cable |
| Fiber Type |
SMF-28
Earlier datasheet states SMF28-Compatible
|
| Connectors | FC/APC and Connector Protection Fitting Optional |
| Cable Bend Radius | ≥ 17 mm |
| Fastening Methods |
Spot Weld, Epoxy Mount
Earlier datasheet lists Spot weld only
|
| 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 |
os3155-tttt/ssss-1xx-1yy
Example: o3155-1512/1516-1FC-1FC
|
|---|---|
| Strain/Temp Wavelengths (+/- 1nm), standard |
1462/1466, 1472/1476, 1482/1486, 1492/1496, 1502/1506, 1512/1516, 1522/1526, 1532/1536, 1542/1546, 1552/1556, 1562/1566, 1572/1576, 1582/1586, 1592/1596, 1602/1606, 1612/1616
Earlier datasheet lists 1582/1588 instead of 1582/1586
|
| Cable 1 / Cable 2 length |
1 m Standard, Cable Length
Code 1 in positions 1xx and 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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