Measures displacement or average strain over a long measurement basis. Used to capture the global deformation of rocks, soils and structural elements.
BOF-EX Retrievable Borehole Extensometer
The BOF-EX is an incremental borehole extensometer. This design of extensometer is extremely stable and accurate. Unlike rod-type extensometer (MPBX), the 32 mm OD rigid tubing sections eliminate possible bending and friction between rods, and thermal effects are significantly reduced as each measuring module is placed inside the borehole next to the anchor.
R-4 Magnetic Reed Switch Probe Extensometer System
The R-4 is a magnetic extensometer system used to measure settlement or heave in engineered backfill structures (dikes, earthfill dams, road foundations) or in natural slopes or embankments. The system consists of an access pipe or standpipe, anchor magnets and a portable reed switch probe. It may be used with inclinometer casings (70 or 85 mm) to obtain both lateral and vertical movement profiles or with standard PVC access pipe (33 or 48 mm).
This design incorporates several improvements compared to other convergence instruments available on the market.
ERI Fill Extensometer
The ERI is a fill extensometer designed to monitor longitudinal displacements between two points inside any type of man-made fill. It is usually installed horizontally in trenches. It may also be installed vertically to measure settlement at the point of contact with the foundation. It is also used to monitor the crest of earthfill dams to locate tension cracks.
BOR-EX Borehole Rod Extensometer
The BOR-EX is a borehole rod extensometer used to transmit all anchor displacements from failure planes in rock or zones of movement in soil masses to a collar reference plate for mechanical readings (dial or depth gauge). To simplify reading or remote monitoring, standard electrical head assemblies are available with potentiometer or vibrating wire transducers. A variety of rod and anchor types are available.
BOR-EX Borehole Rod Extensometer (Displacement Sensor)
The displacement sensor used with a borehole extensometer makes it possible to control, with precision, the stability of: foundations, solid masses around tunnels or any other type of cavity, embankments, excavations and natural slopes. The sensor measures relative displacement between the superior free end part of the extension rod reference tip, which is integral to the anchor, and the reference plate or the extensometer head.
SOFO Standard Deformation Sensor
The SOFO deformation sensors are transducers that transform a distance variation into a change in the path unbalance between two optical fibers that can be measured with a SOFO VII Reading Unit.
The sensor is composed of two main parts: active and passive. The active part contains the reference and the measurement fibers and measures the deformations between its two ends.The passive part is insensitive to deformations and is used to connect the sensor to the Reading Unit. The output is terminated with an E-2000 connector with a built in protective cover.The sensors can be quickly and easily surface mounted or directly embedded in concrete and mortars.
MuST FBG Deformation Sensor
The FBG deformation sensors are transducers that transform a static or dynamic distance variation into a change in reflected wavelength of a pre-stressed Fiber Bragg Grating that can be measured with SMARTEC Reading Units.
The sensor is composed of an active and a passive part. The active part contains the measurement fiber and measures the deformations between its two ends, transforming it into a wavelength shift of the Fiber Bragg Grating. The passive part is insensitive to deformations and is used to connect the sensor to the Reading Unit. In the passive part of the sensor, it is possible to install a loose Fiber Bragg Grating for temperature sensing and compensation.
The sensors are available in single-ended, double-ended and chained configuration. It is possible to connect up to 7 full-range temperature compensated sensors. The sensors are terminated with E2000-APC connectors or on the user‘s specifications.
The sensors can be quickly and easily installed without affecting the construction schedule. They can be directly embedded in concrete and mortars, or surface mounted.
MuST FBG Multiplex SMARTprofile Deformation Sensor
The SMARTprofile strain sensors are transducers that transform a strain variation into a change in reflected wavelength of a FBG encapsulated into a surface mountable patch. These sensors are compatible with SMARTEC MuST Reading Units.
The SMARTprofile consists of a reinforced composite profile inside which an embedded strain-sensing FBG is installed. An additional temperature sensor can optionally be embedded in the same profile at the end of the sensor.
Small cross-section (width ~8 mm; thickness ~3 mm) and composite packaging properties make it ideal for its application in harsh on-site conditions. It features high mechanical, chemical and temperature resistance.
It can be effectively used in the following applications:
– Structural monitoring of naval structures
– Sub-sea applications; e.g. monitoring of shallow and deep-water risers, off-shore platforms, and other oil & gas structures
– Industrial and military structures etc.
The SMARTprofile can be simply bonded or clamped to any kind of surface such as steel, composite, concrete, etc.