An accelerometer is a device that produces a voltage proportional to instantaneous acceleration, used to measure acceleration forces in various applications such as navigation and vehicle stability. There are different types of accelerometers including piezoelectric, piezoresistive, capacitive, and others, each with specific principles and advantages for high shock applications, seismic measurements, or thermal convection. Typical uses include engine knock sensors, vibration testing, and inertial navigation, among others.

1. Accelerometer

2. What is an accelerometer?
Device
Produces voltage proportional to Instantaneous
acceleration
The meter is calibrated to display Acceleration,
Velocity & Displacement

3. How?
Measure Acceleration
Forces
Measure Proper
Acceleration
Acceleration of a body in
its own instantaneous rest
frame
Static Dynamics

4. Static Acceleration
Mobile Tilt Saving Data Air-bag
Activation

5. Dynamic Acceleration
Navigation Flight
Stabilization

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

9. Piezoresistive Accelerometer
• Pressure or stress  Δ resistance
Configured into a
Wheatstone bridge circuit
Volatage

10. Why Piezoresistive Accelerometer, out
of many option Available
High Shock Applications

11. Capacitive accelerometers
• Two parallel plate capacitors
• The detection circuit captures the induced
peak voltage
• final output signal a summing amplifier.

12. Why Capacitive Accelerometer, out of
many option Available
Sensitive

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.

17. THANK YOU 