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Instrumentation - Structural monitoring
Instrumentation
Linear Displacement: A variety of transducers available with resolutions as fine as 1 micron (a human hair typically 70 microns thick). Contact and non-contact methods are available.
Linear Strain: Choice of foil rosette or vibrating wire strain gauges available. The use of vibrating wire strain gauges is recommended on construction sites since readings are based on frequency and are therefore more stable in damp and wet conditions.
Angular Displacement: The use of electrolevels is recommended. These instruments are sensitive enough to detect changes in gravitational pull from the moon. A ‘train’ of electrolevels may be used to calculate sag of beams and floors, tilt of walls and vertical and horizontal displacements.
Distance/Angular Measurement: Our range of Leica total stations with EDM (Electronic Distance Measurement) capabilities can measure pin point positions to 0.6mm and have a 0.5” (half an arc second) angular accuracy.
Vibration/Acceleration: Tri-axial, piezoelectric and strain gauge accelerometers are used to monitor Peak Particle Velocity (PPV) and Vibration Dose Value (VDV).
Noise: Class 1 integrated sound meters are available to monitor instantaneous noise levels and long-term minimum (Lmin), maximum (Lmax) and average noise exposure (LAeq)
Stress/Load/Pressure: Monitored using load cells and pressure transducers along with strain gauges and vibrating wire technology. In-situ stress analysis enables the stress and load carried by a member to be calculated. This is achieved by drilling a small hole to relieve stress and measuring the resulting strain change around the hole.
Bend sensors: Using fibre optic technology.
Level: Water levels used for simplicity in monitoring sag, subsidence etc.
Other: A large range of transducers available, please ask for more details.
Linear Strain: Choice of foil rosette or vibrating wire strain gauges available. The use of vibrating wire strain gauges is recommended on construction sites since readings are based on frequency and are therefore more stable in damp and wet conditions.
Angular Displacement: The use of electrolevels is recommended. These instruments are sensitive enough to detect changes in gravitational pull from the moon. A ‘train’ of electrolevels may be used to calculate sag of beams and floors, tilt of walls and vertical and horizontal displacements.
Distance/Angular Measurement: Our range of Leica total stations with EDM (Electronic Distance Measurement) capabilities can measure pin point positions to 0.6mm and have a 0.5” (half an arc second) angular accuracy.
Vibration/Acceleration: Tri-axial, piezoelectric and strain gauge accelerometers are used to monitor Peak Particle Velocity (PPV) and Vibration Dose Value (VDV).
Noise: Class 1 integrated sound meters are available to monitor instantaneous noise levels and long-term minimum (Lmin), maximum (Lmax) and average noise exposure (LAeq)
Stress/Load/Pressure: Monitored using load cells and pressure transducers along with strain gauges and vibrating wire technology. In-situ stress analysis enables the stress and load carried by a member to be calculated. This is achieved by drilling a small hole to relieve stress and measuring the resulting strain change around the hole.
Bend sensors: Using fibre optic technology.
Level: Water levels used for simplicity in monitoring sag, subsidence etc.
Other: A large range of transducers available, please ask for more details.