Compared to obsolete compression design, annular shear piezoelectric sensors feature better frequency response, improved base strain, lower noise, smaller size, thermal transient immunity and insensitivity to cable motion. Annular shear mode is also less susceptible to transverse vibrations and better immune to electronic saturation at high frequency.
Why industrial triaxial vibration sensors are bigger than laboratory ones?
Triaxial industrial sensors require dual case isolation provided by an internal Faraday shield. Laboratory triaxial sensors are only isolated (if at all) by an external isolation pad on the mounting surface or by an anodised aluminum housing. They are therefore prone to ground loop and 50 Hz or 60 Hz pickup. In harsh environments, industrial vibration sensors don’t allow for such solutions.
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