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Piezoresistive Accelerometers

By Bestech Australia

Piezoresistive Accelerometers are suitable for high frequency, high g shock measurement. Instead of sensing the capacitance changes in the seismic mass, a piezoresistive accelerometer takes advantage of the resistance change of piezoresistive materials to covert mechanical strain to a DC output voltage. Most of the Piezoresistive designs are either MEMS type (gas damped) or bonded strain gauge type (fluid damped) and they are suitable for impact measurements where frequency range and g level are considerably high.
 
Piezoresistive accelerometers are widely used in automobile safety testing including anti-lock braking system, safety air-bags and traction control system as well as weapon testing and seismic measurements. In addition, micro machined accelerometers are available and used in various applications, such as submillimeter piezoresistive accelerometers in extremely small dimensions used for biomedical applications.
 
Piezoresistive accelerometers are versatile due to their frequency and dynamic range capabilities. As a DC-response device, it’s chosen to handle static acceleration and produce accurate velocity and displacement data. Also, broad bandwidth covers most dynamic measurement needs. 
 
High precision, DC responding Endevco® Piezoresistive accelerometers are widely specified within vehicle safety testing applications for accurate measurements such as front, side and rear impact, crush zones, in-vehicle occupant and pedestrian safety. Their high-impact shock and vibration, rotational acceleration, long duration transient motion and low-frequency measurement capacities are ideal for anthropomorphic test devices (ATD) manufacturers, test laboratories, and OEMs. Meggitt’s Endevco innovated the first fully micro-machined monolithic Piezoresistive acceleration sensor, with operating ranges from 2000 to 200 000 g and is specialising in MEMS based Piezoresistive accelerometers for a variety of applications. Also, Meggitt manufactures Piezoresistive Strain Gauge 
 
Accelerometers with subcritical damping and high overload capabilities. Their accelerometers have been the standard for automotive crash testing for many years.
 
Highlights of resistive accelerometers:
Simple process;
High response frequency, superior in high g measurement;
Small dimensions;
Easy measurement method;
Good linearity
 
For more product details, please click here or download  practical understanding of accelerometer specifications
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