This project explorers the ability to use Microelectromechanical Systems (MEMS) type accelerometers as a viable replacement for moving coil seismic transducers and/or piezoelectric accelerometers in the field of vibration monitoring for rotating machinery.
Given a specific MEMS accelerometer, this circuit was designed to meet the following requirements:
- Single-sided 24 volt power supply
- Positive voltage outputs
- Acceleration output of 2000 mV/g
- Velocity output from on-board hardware integration of 1000 mV/in/s
- Buffered outputs to protect from short circuits
- AIM frequency response of 0.1 – 1000 Hz (3dB)
- Non-differential acceleration and velocity output
Features & Design Techniques
Hardware integrator to convert from acceleration to velocity
Band pass filtering
- Four-pole Salen Key HPF with 3db @ 0.1 Hz before integrator
- Two-pole Salen Key LPF for noise reduction
Dual vibration output (velocity and acceleration)
Specifications
Responsibilities & Scope
- Design of circuit topology
- Circuit design and schematic capture in Altium
- Altium Designer PWB layout
- Tolerance analysis
- Assembly and functional testing
- Seismic testing
- Entire project from start to finish
Project Photos
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