Structural Health Monitoring Sensors

Dewesoft offers almost any kind of static and dynamic sensor used in Structural Health Monitoring and Geotechnical monitoring applications.

IEPE
IEPE
Strain / Stress
Strain / Stress
Full Bridge
Full Bridge
Half Bridge
Half Bridge
Quarter Bridge
Quarter Bridge
Voltage
Voltage
Force
Force
Temperature
Temperature
Thermocouple
Thermocouple
Thermal video
Thermal video
Angle
Angle
Vibrations
Vibrations
Acceleration
Acceleration
Displacement
Displacement
Distance
Distance
Fanless
Fanless
Frequency
Frequency
Gyroscope
Gyroscope
High-speed video
High-speed video
Orientation
Orientation
Potentiometer
Potentiometer
Pressure
Pressure
Resistance
Resistance
Sound
Sound
Sound pressure
Sound pressure
TEDS compatible
TEDS compatible
Velocity
Velocity
Video
Video

Highlights

  • 3-Axial ACCELEROMETERS and INCLINOMETERS: in-house developed low-noise MEMS accelerometers and inclinometers with analog-to-digital conversion, and EtherCAT interface. Ideal for permanent monitoring of structures. 
  • WEATHER STATIONS and GNSS antennas: monitoring wind speed, wind direction, sun intensity, precipitation, temperature, relative humidity and other weather conditions as well as accurate overall motion of structure with GNSS antennas is possible by using the Dewesoft solution.  
  • VIBRATING WIRE SENSORS: Dewesoft supports almost any vibrating wire sensors starting with strain gauges, piezometers, inclinometers, crack meters, extensometers and others.
  • INTEGRATION SUPPORT: Dewesoft supports you with integration of any kind of sensor required in geostructural monitoring applications into a centralised software interface. 

Structural Health Monitoring Sensors Overview

When selecting a sensor, a lot of criteria need to be taken into account:

  • environmental rating (temperatures, water resistance, dust resistance...),
  • sensitivity,
  • dynamic range,
  • accuracy, and
  • other criteria.


Depending on the application and customer request we can provide you with either our in-house developed or suggest you an appropriate 3rd party sensor.

Most importantly, data from any sensor, either our proprietary or 3rd party, performing static measurements or dynamic measurements are integrated into the same centralized software interface enabling automatic reporting and alarm notifications.

Structural Health Monitoring Sensors Overview

Supported Sensors for Static Measurements

We offer several sensors for performing static measurements:

  • Tiltmeters
  • Crack and joint meters
  • Piezometers
  • IPI inclinometers
  • Vibrating wire strain gauges
  • Vibrating wire load cells
Supported Sensors for Static Measurements

Supported Sensors for Dynamic Measurement

We offer several sensors for performing static measurements:

  • 3-axial MEMS accelerometers
  • Bolt-on strain gages
  • Microphones
  • Low-noise seismic accelerometers
Supported Sensors for Dynamic Measurement

MEMS Tiltmeters 

Tiltmeters are used for measuring changes of inclination or vertical rotation of structures due to water level changes, ground heave, or other factors.

Dewesoft offers different tiltmeters depending on the application requirements. Our tiltmeters are MEMS-based and can be installed on a vertical or horizontal surface and can be single-axis (measuring inclination in one direction) or dual-axis (measuring inclination in two directions).

Tiltmeters are normally used for monitoring the inclination of retaining walls, foundation settlement, bridge piles, and structure health monitoring (SHM) of bridges and dams.

  • Range: +-15°

  • Resolution: from 0.001° up to 0.0006°

  • Available types: In-place tilt meter, tilt beam meter, submersible tilt meter, track monitoring tilt system

MEMS Tiltmeters 

Crack and Joint Meters

Crack meters are sensors for monitoring displacements across joints or cracks in rock formations, dams, buildings, or bridges.

Once installed they monitor deformations caused by geotechnical activity. Depending on the application, movements can be monitored using single-axis or three-axial crack meters.

  • Range: 25, 50, 100, 150, 200 mm 

  • Resolution: 0.2% F.S up to 0.1% F

  • Available types: Crack meter and Vibrating Wire Joint meter

Crack and Joint Meters

Piezometers

Piezometers are sensors used to monitor pore water pressure and groundwater level. They have a significant effect on ground behavior.

Piezometers are typically used for understanding drained or undrained behaviors of soil formations under loads, dewatering programs efficiency assessment, short term, and long-term soil settlement behaviors, and safety of slopes.

  • Over range: 25, 50, 100, 150, 200 mm 

  • Resolution: 0.2% F.S up to 0.1% F

  • Accuracy: Crack meter and Vibrating Wire Joint meter

  • Linearity spec: <0.5% F.S.

  • Operating Temperature: -20 to 80°C (-4 to 176°F)

  • Diaphragm Displacement: <0.001 cc at F.S.

  • Thermal Zero Shift: <0.05% F.S./°C

Piezometers

IPI Inclinometers and Clinometers

IPI Inclinometers are sensors used for automated monitoring of lateral displacements to ensure the safety of infrastructure. It is essential to monitor ground stability (ground creep, slope stability, shear zone movement) during the construction works as well as over the construction life.

The installation of the inclinometer depends on the application.  Inclinometers need to be installed vertically when monitoring slope gradient in embankments or retention walls. To monitor the settlement of rocks or soil over the tunnel, horizontal installation of inclinometers is required.

  • Range: ±30° (Biaxial)

  • Resolution: ±0.0002° (0.004 mm/m)

  • Non-linearity: ±0.002° (0.03 mm/m)

  • Sensor: MEMS (Micro-Electro-Mechanical Systems) Accelerometer

  • Gauge Lenght: 0.5 – 3 meters

IPI Inclinometers and Clinometers

Vibrating Wire Strain Gauges

Vibrating Wire Strain gauges are sensors capable of precise measurement of strain in different materials including concrete and steel. They are used to determine stress and its changes over time.

Vibrating Wire Strain Gauges are designed to be welded to or embedded in various structures for monitoring strain.

VW Strain gauges can be embedded or welded on any structure including high-rise buildings, dams, bridges, tunnels, nuclear plants, etc.

  • Strain range: 3000 μɛ

  • Sensitivity: 1.0 microstrain

  • Operating temperature: -20C to +80C

  • Thermal coefficient of expansion: 12.2 ppm/C

Vibrating Wire Strain Gauges

Vibrating Wire Load Cells

Load cells are transducers used for the measurement of weight and its changes over time. They are composed of several strain gauges, to improve the sensitivity, accuracy, and reliability of the load cell. Load cells are used in the initial state during the research phase as well as at later stages, for monitoring the structure's health.

The applications for load cells include measuring and monitoring loads of ground anchors, struts, soldier piles, rock bolts, and pile load tests.

  • Capacity: 445 kN to 4450 kN (100,000 to 1,000,000 lbs)

  • Overrange Capacity: 150% full scale

  • Sensitivity: 0.01% full scale

  • Accuracy: 0.5% full scale

Vibrating Wire Load Cells

Temperature Sensors

For temperature measurements thermistor strings are normally used sice are easy to install and reliable under demanting geotechnical conditions. Thermistor string assemblies areare available in single-point or multi-point strings..

The strings incorporate interchangeable, curve tracking, negative temperature coefficient (NTC) thermistors. As the thermistors are curve matched to desired temperature tolerance over selected temperature ranges, this permits the use of multiple sensors with a single readout or data logger, eliminating costly calibration procedures.

  • Interchangeability Tolerance: ±0.1°C.

  • Interchangeability Temp. Range: 0°C to +75°C.

  • Operating Temp. Range: -80°C to +75°C.

  • Stability: 0.01°C or better /100 months at 0°C.

  • Resistance at 25°: 3k ohms.

Temperature Sensors

MEMS Accelerometers

Accelerometers are transducers used for monitoring vibrations. They produce electrical signals in proportion to acceleration.

MEMS accelerometer (Micro-Electro-Mechanical System) is actually a microchip that has a mechanical structure (a cantilever beam or seismic mass) that changes its electrical property (usually capacitance) related to the acceleration. Because of that, they are very good at measuring static and dynamic acceleration. A 3-axial accelerometer is a sensor capable of measuring acceleration in all three directions (X, Y, and Z).

IOLITE 3-axial MEMS accelerometers are used in the research phase of civil engineering projects, during construction works (especially if blasting or pile driving activities are executed) as well as at later stages, for monitoring the structure's health (for operational modal analysis). 

  • Measurement range: +- 8g or +- 40g

  • Bandwidth: 1.000 Hz

  • Sampling speed: 4.000 S/s

  • Noise density (+-2g): 25 µg/√Hz

MEMS Accelerometers

Low-Noise Accelerometers and Seismic Accelerometers

Low noise/Seismic accelerometers have, in comparison to MEMS accelerometers, better sensitivity and are normally used in seismic and structural monitoring projects. However, they are way more expensive compared to MEMS accelerometers.

  • Frequency response: 30s - 100Hz or 60 s - 100 Hz

  • Noise: self-noise below the USGS NLNM from 30 s to 16 Hz

  • High linearity: > 107 dB horizontal, 111 dB vertical

  • Dynamic range: over 140 dB dynamic range over a wide frequency band

  • Cross axis rejection over 62 dB. Sensor axes are orthogonal to within ± 0.05°

Low-Noise Accelerometers and Seismic Accelerometers

Bolt-on Strain Gauges

Bolt-on strain gauges are transducers ideal for measuring live-load strain on all structures. They are very rugged, water and dust resistant, and build to withstand the harshest environments. They have been designed for easy installation, without the need of soldering or gluing, and are used in bridge monitoring, live-load testing, fatigue monitoring applications.

Dewesoft offers a variety of bolt-on strain gauges suitable for measuring strain in your applications.

  • Strain range: 10 - 1100 μɛ

  • Maximum strain: 1.500 μɛ

  • Rated Output: 1.5mV/V for 1,000 micro-strain

  • Linearity & Repeatability: 0.1% of rated output (FSD)

Bolt-on Strain Gauges

Microphones

Microphones are sensors that convert sound in the air into an electrical signal. They are used for noise or overpressure measurement, especially during construction works. Activities like jackhammering, pile diving, or blasting are noisy and cause concerns to neighbors. In worst-case scenarios, they lead to complaints and work suspensions.

Dewesoft offers a variety of microphones suitable for measuring and recording noise according to your application needs.

Microphones

Other Supported Sensors

Our structural health monitoring system offers support also for sensors like:

  • GNSS antennas for GPS positioninig
  • Weather station for monitoring wind speed, wind direction, sun intensity, relative humidity, brightness
  • WIM – Weigh in motion
Other Supported Sensors

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