Low Frequency & Seismic High Sensitivity ICP Accelerometers

High sensitivity ICP® accelerometers are specifically designed to enable the precise detection of ultra-low-level, low-frequency vibrations commonly associated with very large structures, foundations, and earth tremors. These sensors typically possess exceptional measurement resolution due to their comparatively larger size, which furnishes a stronger output signal and a significantly lower noise floor. All units are hermetically sealed within robust titanium or stainless steel housings to ensure durability and reliability under demanding environmental conditions. Additionally, models that include a 2-pin, military-style connector provide the added benefit of being electrically case isolated, offering superior protection against radio frequency interference (RF) and electromagnetic interference (EMI) for enhanced measurement accuracy.

Vibration monitoring of buildings, monuments, and critical infrastructure is a crucial element in the development of smart cities, as it enables precise identification of the amount of stress and strain that has been applied to a structure over time. This technology ensures the highest degree of occupant protection during events when the structure is at full capacity or subjected to extreme environmental conditions, significantly reducing the time and resources needed to perform damage assessments. Research has demonstrated that large crowds, such as those in stadium grandstands or theater balconies, can exert tremendous forces and cause harmonic motion within the structure, especially when the crowd moves in synchronization. Additionally, natural phenomena like earth tremors, along with everyday occurrences such as foot traffic and the movement of trucks and trains, contribute to vibrations that may cause a structure to sway, shift, deteriorate, or even collapse. By employing permanently installed high-sensitivity accelerometers, engineers can collect real-time data for continuous monitoring, trend analysis, and timely alerts. Whenever structural motion nears predefined safety thresholds, automated alerts and warnings activate, allowing emergency response plans to be promptly implemented, thereby enhancing overall safety and structural resilience.

Decaying infrastructures, particularly bridges, have received significantly heightened awareness and concern in recent years due to their critical role in public safety and transportation networks. Among the several advanced techniques available for determining the health and longevity of civil structures, vibration measurements are widely utilized for continuous monitoring, detailed modal analysis, and comprehensive structural integrity investigation. High sensitivity accelerometers generate precise signals in response to a variety of external stimuli, including traffic loads, wind forces, and programmed impulse excitations. When carefully analyzed, these signals provide valuable insight for accurately determining the current condition and overall safety of the structure. This thorough investigative analysis often leads to well-informed recommendations for remedial construction, necessary maintenance interventions, or continued and enhanced monitoring strategies to ensure long-term structural reliability.

Highlights:

• Resolution down to 1 µg rms broadband

• Extended low frequency measurement capability

• Hermetically sealed

Applications

• Semiconductor manufacturing

• Smart Infrastructure - foundation, floor vibration, & security monitoring

• Earthquake detection / Sway fatigue analysis

• Structural testing of bridges and foundations

• Geological formation studies