os3600 Embeddable Optical Strain Sensor (FBG) for Concrete Structures
FBG-based embeddable strain sensor for concrete that measures average strain over the gage length, with integrated temperature compensation.
- Strain sensitivity
- ~ 1.2 pm/με
- Temperature sensitivity
- 23.8 pm/°C
- Temperature compensation
- Integrated into each gage
- Gage length
- 25 or 100 cm
Overview
The Luna os3600 is an embeddable strain sensor based on fiber Bragg grating (FBG) technology. It measures average strain over the length of the gage and is available in two gage lengths, 25 cm and 100 cm. The sensor is intended exclusively for embedding in concrete structures; its disk ends form a solid bond to the surrounding concrete or grout. Universal ends allow bolt-on, weld-on or custom end brackets to be used for attachment to rebar or other structures before embedding.
The sensor body is shielded with Teflon and steel, and is supplied with armored cables and optional connector protection fittings for use in harsh environments. Two FBGs are housed inside the body: one measures strain and the other provides integrated temperature compensation. No epoxies are used to hold the fiber to the carrier, which supports long-term stability.
According to Luna, side-by-side comparisons with vibrating wire and foil strain gages show the os3600 to be equally sensitive and accurate, with 100 times more fatigue life. The sensor is qualified to the same standards applied to comparable electronic gages.
The os3600 can be used alone or in series as part of an FBG sensor array, with a double-ended design that supports multiplexing many sensors on one fiber. It is used with Luna HYPERION interrogators and is included in the ENLIGHT software sensor templates for optical-to-mechanical conversion.
Key Features
- Ruggedized sensor package, qualified to same rigorous standards applied to electronic gages
- Integrated temperature compensation FBG sensor
- Connector protection fittings available for harsh environments
- Double-ended design supports multiplexing of many sensors on one fiber
- Two standard gage lengths of 25 and 100 cm
- IP67 rated for protection from dust and water ingress
- Fast, simple, repeatable installation
- Cable integrated with sensor package for fiber protection and strain relief
- Micron Optics patented micro opto-mechanical technology
- Included in ENLIGHT sensor templates for optical to mechanical conversions
Specifications
| Strain sensitivity |
~ 1.2 pm/με
Actual gage factor provided with gage
|
|---|---|
| Temperature sensitivity |
23.8 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 | ± 2,500 με |
| Water resistance | Suitable for wet, high humidity environments (IP67) |
| Fatigue life | > 1x10^8 cycles @ +/- 2,000 με |
| Dimensions |
See diagram in data sheet
Dimensions in mm
|
|---|---|
| Weight | 416 g (25 cm, disk); 740 g (100 cm, disk) |
| Material | Stainless Steel/teflon construction |
| Cable type | 3 mm armored cable |
| Cable bend radius | ≥ 17 mm |
| Anchoring methods | Embeddable only |
| 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 |
os3600-ggg-tttt/ssss-1xx-1yy
ggg = gage length; tttt/ssss = strain/temp wavelengths; 1xx / 1yy = cable 1 / cable 2 length and connector
|
|---|---|
| Strain/Temp wavelengths (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
|
| Standard cable length |
1 m
Per cable (cable 1 and cable 2)
|
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) in the ordering number |
| 100 | Gage length 100cm — Gage length code (ggg) in the ordering number |
| 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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