os3610 Surface Mount Strain Sensor (FBG, Temperature Compensated)
FBG-based surface mount strain sensor that measures average strain over a 25 or 100 cm gage length with integrated temperature compensation.
- Strain sensitivity
- ~ 1.2 pm/με
- Temperature sensitivity
- 22 pm/°C
- Temperature compensation
- Integrated into each gage
- Gage length
- 25 or 100 cm
Overview
The Luna os3610 is a strain sensor based on fiber Bragg grating (FBG) technology and is intended exclusively for surface mounting. It is available in two gage lengths, 25 cm and 100 cm, and measures average strain over the length of the gage. Each end of the sensor is attached to the structure through rigid brackets that are welded, bolted, epoxied or grouted to the surface of concrete, rock, steel, composite or other structures.
Two FBGs are housed inside the sealed stainless steel body. One FBG measures strain and the other provides integrated temperature compensation. No epoxies hold the fiber to the carrier, so long-term stability is ensured by design. Armored cables and optional connector protection fittings allow use in harsh environments, and the package is IP67 rated against dust and water ingress.
In side-by-side comparisons with vibrating wire and foil strain gages, the manufacturer reports that the os3610 is equally sensitive and accurate while offering corrosion insensitivity and 100 times more fatigue life. The sensor is qualified to the same standards applied to comparable electronic gages.
The os3610 can be used alone or in series as part of an FBG sensor array; its double-ended design supports multiplexing many sensors on one fiber. It is included in the sensor templates of Luna ENLIGHT software for optical-to-mechanical conversion and is typically used with HYPERION interrogators.
Key Features
- Ruggedized sensor package, qualified to same rigorous standards applied to electronic gages
- Integrated temperature compensation FBG sensor
- User-adjustable zero point optimizes full use of strain range
- Two standard gage lengths of 25 and 100 cm
- Fast, simple, repeatable installation
- Cable integrated with sensor package for fiber protection and strain relief
- Connector protection fittings available for harsh environments
- Double-ended design supports multiplexing of many sensors on one fiber
- Included in ENLIGHT sensor templates for optical to mechanical conversions
- IP67 rated for protection from dust and water ingress
Specifications
| Strain sensitivity |
~ 1.2 pm/με
Actual gage factor provided with gage
|
|---|---|
| Temperature sensitivity |
22 pm/°C
Actual gage factor provided with gage
|
| Temperature compensation | Integrated into each gage |
| Gage length | 25 or 100 cm |
| Operating temperature range | -40 to 80 °C |
| Strain limits |
5,000 με
Zero point set by user; web page lists ± 5,000 με
|
| Fatigue life | > 1x10^8 cycles @ +/- 2,000 με |
| Water resistance | Suitable for wet, high humidity environments (IP67) |
| Dimensions |
See Diagram Below
Dimensional diagram in datasheet (mm)
|
|---|---|
|
Weight
25 cm gage length
|
190 g |
|
Weight
100 cm gage length
|
384 g |
| Material |
Stainless Steel/teflon construction
Web page lists stainless steel construction
|
| Cable type | 3 mm armored cable |
| Cable bend radius | ≥ 17 mm |
| Anchoring methods | Surface mount only: bolt-on, grout-in, weldable brackets available |
| Peak reflectivity (Rmax) | > 70% |
|---|---|
| FWHM (-3 dB point) | 0.25 nm (± .05 nm) |
| Isolation |
> 15 dB
@ ± 0.4 nm around center wavelength
|
| Ordering code format |
os3610-ggg-tttt/ssss-1xx-1yy
ggg = gage length; tttt/ssss = strain/temperature wavelengths; 1xx / 1yy = cable 1 / cable 2 length and connector
|
|---|---|
| Standard strain/temp wavelengths |
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
|
| Standard cable length |
1 m
Per cable (cable 1 and cable 2)
|
| Ordering example |
o3610-025-1512/1516-1FC-1FC
As printed in the datasheet
|
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
- 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 |
|---|---|
| 025 | Gage length 25cm — Gage length code (ggg) |
| 100 | Gage length 100cm — Gage length code (ggg) |
| UT | Unterminated — 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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