Ground motion detection / 地面運動檢測
Systems that can detect ground motion are the backbone of any military or
homeland security applications. Such systems rely on seismic and acoustic
sensors which can detect large (heavy vehicles) or small-sized objects (such as
people or small underwater vehicles) that move on the surface, underground
and/or in the water.
The MEMS sensors
Unlike traditional seismic sensors, MEMS-based ground motion detection systems
provide the best results in various defense and security applications due to
their greater accuracy of response, higher stability, linear frequency, improved
phase characteristics and higher dynamic range.
Aside from the MEMS allowing seismic
sensors to be smaller and yield
superior performance, they also offer high noise immunity from electromagnetic
interference, a feat which proves extremely useful in applications that require
small seismic signals in difficult ambient noise situations.
Colibrys MEMS accelerometer
VS1000 vibration sensors offer
the best combined bias-stability, repetitive high-shock resistance, linearity
and noise performance available on the market. The V1000 embeds an optimized
MEMS sensor, an improved die attach, a new ASIC with a powerful 200’000 Hz
internal clock and a temperature sensor, the combination of which offers an
outstanding large and flat frequency response from DC 0 Hz to 2500 Hz ±5% (typ),
7’000 Hz ± 3dB (typ).
The new ASIC-optimized architecture offers exceptional bias and scale factor
temperature stabilities of ± 0.2 mg/°C (min/max) and 120 ppm/°C (typ). It also
features overload and aftershock recovery detection. The non-linearity becomes
almost nonexistent with 0.1% of the full scale output (typ), under vibrations.
The vibration sensor is available with a wide range of dynamics from ±2 to
±200g, which will allow it to address various applications with a single
electronic interface and package.
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