DISTRIBUTED FIBER OPTIC SENSOR FOR CIVIL AND GEOTECHNICAL INTEGRITY MONITORING
High-accuracy distributed strain and temperature sensing.
Fully redundant configuration. For embedded or surface mounted installation.
The SMARTprofile II combined strain and temperature sensor is designed for distributed deformation (average strain) and temperature monitoring (average temperature) over long distances, using BOTDR / BOTDA (Brillouin scattering) and ROTDR (Raman scattering) technologies.
The SMARTprofile II sensor consists of two bonded and two free single mode optical fibers (BOTDA / BOTDR) and two free multi mode fibers (ROTDR) embedded in a polyethylene thermoplastic profile. The bonded single mode fibers are used for strain monitoring with BOTDA / BOTDR system , while the free single mode fibers are used to create an optical loop for BOTDA measurement or for temperature measurements with BOTDA / BOTDR system (quantitative if sensor deformation < 0.2%, qualitative if sensor deformation > 0.2%) and to compensate temperature effects on the bonded fibers. The two additional multi mode fibers are insensitive to mechanical strain and used for temperature measurement to compensate temperature effects through Raman system. For redundancy, two fibers are included for both strain and temperature monitoring. The profile itself provides good mechanical, chemical and temperature resistance. The small size of the profile makes the sensor easy to transport and install by embedding in concrete or mortars, gluing or clamping. The SMARTprofile II sensor is designed for use in environmental conditions typically found in civil, geotechnical and oil &gas applications. However, this sensor cannot be used in extreme temperature environments, nor in environments with aggressive chemicals. It is not recommended for installation under permanent UV radiation (e.g. sunshine) without an additional cover or aluminum tape protection.
The SMARTprofile II sensing cable is delivered on spools with all the necessary accessories.
|Operating temperature:||-40 °C to +60 °C|
|Storage temperature:||-5 °C to +40 °C|
|Installation temperature:||-5 °C to +50 °C|
|Pigtails and connectors:||-40°C to +60°C|
|Temperature compensation:||through single mode temperature fibers with DiTeSt BOTDA / BOTDR, if strain ≤ 0.2 %
through multi mode temperature fibers with DiTemp ROTDR, insensitive to mechanical strain
|Strain range:||-1.5 % to +1.5 %|
|Maximal length:||700 m / reel, more upon request|
|Dimensions (W x H):||8.0 mm x 4.0 mm|
|Weight:||22 ± 0.5 kg/km|
|Max tensile strain:||1.5%|
|Min bending radius:||400 mm (long term)|
|Hydrostatic pressure:||300 kPa (3 bar)|
|Fiber support (strain):||2 SMF 9 / 125 um Polymide coated ITU-T G.652.D compliant|
|Fiber support (temperature):||2 SMF 9 / 125 um Acrylate coated ITU-T G.652.D compliant
2 MMF 50 / 125 um Acrylate coated ITU-T G.651 compliant
|Fiber attenuation (cabled @ 20 °C):||≤ 1.2 dB @ 1310 nm – SMF strain ≤ 3.0 dB @ 850 nm – MMF temperature
≤ 1.0 dB @ 1550 nm – SMF strain ≤ 1.0 dB @ 1300 nm – MMF temperature
≤ 0.4 dB @ 1310 nm – SMF temperature
≤ 0.3 dB @ 1550 nm – SMF temperature
|Number of fibers:||2 SMF strain fibers + 2 SMF temperature fibers + 2 MMF temperature fibers|
11.1030 DiTeSt SMARTProfile II Sensor