os3510 Surface Mount Strain Sensor (FBG) with Integrated Temperature Compensation
Fiber Bragg grating surface mount strain sensor that measures average strain over a 110 mm gage length with integrated temperature compensation.
- Strain sensitivity
- ~ 1.2 pm/με
- Temperature sensitivity
- 22pm/C
- Temperature compensation
- Integrated into each package
- Gage length
- 110mm
Overview
The Luna os3510 is a surface mount strain sensor based on fiber Bragg grating (FBG) technology. It measures average strain over the length of the gage and includes integrated temperature compensation. The sensor is intended exclusively for surface mounting: each end is attached to the structure with rigid brackets that are welded, bolted, epoxied or grouted to concrete, rock, steel, composite or other surfaces.
The os3510 has a stainless steel body and ruggedized cables, and connector protection fittings are available as options for harsh environments. Two FBGs sit protected inside the body. One measures strain and the other provides temperature compensation. No epoxy holds the fiber to the carrier, which is intended to keep the sensor stable over the long term.
According to Luna, side-by-side comparisons with vibrating-wire and foil strain gages showed the os3510 to be equally sensitive and accurate, with 100 times the fatigue life. The sensor is qualified for use in harsh environments.
The os3510 can be used on its own or in series as part of an FBG sensor array. Its double-ended design allows many sensors to be multiplexed on one fiber, so installation and cabling cost less and take less effort than comparable networks of electronic gages. It is used with Luna HYPERION interrogators for monitoring applications.
Key Features
- Ruggedized sensor package, qualified to the same rigorous standards applied to electronic gages
- Integrated temperature compensation FBG sensor for relative temperature measurement
- Connector protection fittings available for harsh environments
- Double-ended design supports multiplexing of many sensors on one fiber
- Fast, simple, repeatable installation
- Patented micro opto-mechanical technology
- No epoxies holding the fiber to the carrier
- Optical sensor in a conventional, vibrating-wire type package
Specifications
| Strain sensitivity |
~ 1.2 pm/με
Actual gage factor provided with gage
|
|---|---|
| Temperature sensitivity |
22pm/C
On steel
|
| Temperature compensation | Integrated into each package |
| Gage length | 110mm |
| Operating temperature range | -40 to 80° C |
| Strain limits | ± 2500 ue |
| Water resistance |
Suitable for wet, high humidity environments (IP67)
Datasheet lists the same rating without IP67
|
| Fatigue life | > 1x10^8 cycles @ +/- 2,000 ue |
| Dimensions |
See diagram in data sheet
Dimensions in mm
|
|---|---|
| Weight | 98 g |
| Carrier material |
Stainless Steel/Polyolefin construction
Web page states stainless steel construction
|
| Cable type / length | 6 mm/1 mm ruggedized cable/1 m (+/- 10 cm), each end |
| Cable bend radius | ≥40 mm |
| Peak reflectivity (Rmax) | > 70% |
|---|---|
| FWHM (-3 dB point) | 0.25 nm (± .05 nm) |
| Isolation |
> 15 dB
@ ± 0.4 nm around center wavelength
|
| Part number format |
os3510-ggg-tttt/ssss-1xx-1yy
Example: o3510-1512/1516-1FC-1FC
|
|---|---|
| Strain/Temp wavelengths (tttt/ssss) |
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, 1582/1588, 1592/1596, 1602/1606, 1612/1616
+/- 1nm
|
| Cable 1 length & connector (1xx) | 1 m standard cable length; UT unterminated; FC FC/APC connector |
| Cable 2 length & connector (1yy) | 1 m standard cable length; UT unterminated; FC FC/APC connector |
Specifications are taken from the manufacturer's documentation. See the datasheet for complete and current values.
Applications
- Civil infrastructure health monitoring
- Structural health monitoring for energy
- 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)
Options & Accessories
| Option | Description |
|---|---|
| PF | Universal IP67 Connector Protection Fitting |
| os3510_bob | Bolt-on Bracket |
| os3510_gib | Grout-in bracket |
| UT | Unterminated cable — Termination type for cable 1 (1xx) or cable 2 (1yy) |
| FC | FC/APC Connector — Termination type for cable 1 (1xx) or cable 2 (1yy) |
Documents & Resources
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