2. What is an accelerometer?
Device
Produces voltage proportional to Instantaneous
acceleration
The meter is calibrated to display Acceleration,
Velocity & Displacement
6. Piezoelectric Accelerometer
Principle -
“NEWTONS THIRD LAW”
Force exerted on the
material Electrostatic
voltage generated by the
piezoelectric material.
Force .. two types bending or compression
7. Why Piezoelectric Accelerometer, out
of many option Available
Upper frequency range
Low packaged weight and
High temperature range
8. Where we found it?
• Engine Knock Sensors
• Shock Pulse Monitoring of Motor Bearings
• Vibration Testing and Monitoring
• Inertial Navigation
• Drones and Unmanned Aerial Vehicles
• Impact Testing
• Vehicle Stability Control
11. Capacitive accelerometers
• Two parallel plate capacitors
• The detection circuit captures the induced
peak voltage
• final output signal a summing amplifier.
13. Seismic accelerometer
• spring – mass-damper system which
accomplishes the task of acceleration
measurement through displacement.
• Relative mass movement is sensed and
indicated by an electrical displacement
transducer.
14. Thermal convection accelerometer
• Accelerometer contains a small heater at the
bottom of a very small dome Heats the air inside
the dome Air rises
• Movement of gas under acceleration changes
thermal profile.
• Under zero acceleration the heat gradient will be
symmetrical.
15. Hall Effect
• These measure voltage variations stemming
from a change in the magnetic field around
the accelerometer.